k8s-二进制安装v1.25.8
1安装前必读
安装说明：
- 本文章将演示CentOS 7二进制方式安装高可用k8s ；
- 生产环境中，建议使用小版本大于5的Kubernetes版本，比如1.19.5以后的才可用于生产环境。
- 本文档安装版本为v1.25.8；
- k8s集群1.24以及以上版本官方不在支持docker作为容器运行时；需要下载containerd和runc；
- master节点为部署节点，主要操作都是在master节点执行，然后分发到集群各个节点；
2基本环境配置
2.1部署架构图如下：
- 由外部负载均衡器提供一个vip，流量负载到keepalived master节点上。
- 当keepalived节点出现故障, vip自动漂到其他可用节点。
- haproxy负责将流量负载到apiserver节点。
- 三个apiserver会同时工作。注意k8s中controller-manager和scheduler只会有一个工作，其余处于backup状态。我猜测apiserver主要是读写数据库，数据一致性的问题由数据库保证，此外apiserver是k8s中最繁忙的组件，多个同时工作也有利于减轻压力。而controller-manager和scheduler主要处理执行逻辑，多个大脑同时运作可能会引发混乱。
2.2集群矩阵
2.2.1 网段划分
| 网段名称 | 网段 | 备注 |
|---|---|---|
| node网段 | 192.168.75.0/24 | |
| k8s service网段 | 10.96.0.0/12 | |
| k8s pod网段 | 172.16.0.0/12 |
注意：
- node节点IP地址不能设置成dhcp，要配置成静态IP；VIP（虚拟IP）不要和公司内网IP重复，首先去ping一下，不通才可用；VIP需要和主机在同一个局域网内！
- node网段、K8s Service网段、k8s Pod网段不能重复!
2.2.2 节点信息
| 主机名 | IP | 操作系统 | 角色 | 主机配置 | 软件列表 |
|---|---|---|---|---|---|
| master | 192.168.75.10 | centos7.9 | k8s-master、k8s-node、keepalived-主 | 2C2G 40G | haproxy、keepalived、kube-apiserver、kube-controller-manager、kube-scheduler、etcd、kubelet、kube-proxy、Containerd、runc、calico、coreDNS |
| master1 | 192.168.75.13 | centos7.9 | k8s-master、k8s-node、keepalived-从 | 2C2G 40G | haproxy、keepalived、kube-apiserver、kube-controller-manager、kube-scheduler、etcd、kubelet、kube-proxy、Containerd、runc、calico、coreDNS |
| master2 | 192.168.75.14 | centos7.9 | k8s-master、k8s-node、keepalived-从 | 2C2G 40G | haproxy、keepalived、kube-apiserver、kube-controller-manager、kube-scheduler、etcd、kubelet、kube-proxy、Containerd、runc、calico、coreDNS |
| node1 | 192.168.75.11 | centos7.9 | k8s-node | 2C2G 40G | kubelet、kube-proxy、Containerd、runc、calico、coreDNS |
| node2 | 192.168.75.12 | centos7.9 | k8s-node | 2C2G 40G | kubelet、kube-proxy、Containerd、runc、calico、coreDNS |
| master-lb | 192.168.75.100 | 无 | vip | 无 | 无，VIP 虚IP不占用机器资源,如果不是高可用集群，该IP为Master的IP |
2.2.3 软件版本信息
| 软件名称 | 版本 | 备注 |
|---|---|---|
| keepalived | v1.3.5 | yum默认 |
| haproxy | v1.5.18 | yum默认 |
| cfssl | v1.2.0 | 制作证书工具 |
| etcd | v3.5.7 | |
| kubernetes | v1.25.8 | |
| Containerd | v1.6.19 | 配置runtime |
| runc | v1.1.4 | |
| calico | v3.24.5 |
2.3配置所有节点hosts文件
[root@master ~]# cat /etc/hosts
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4
::1 localhost localhost.localdomain localhost6 localhost6.localdomain6
192.168.75.10 master
192.168.75.11 node1
192.168.75.12 node2
192.168.75.13 master1
192.168.75.14 master2
192.168.75.100 master-lb
2.4所有节点CentOS 7安装yum源
curl -o /etc/yum.repos.d/CentOS-Base.repo https://mirrors.aliyun.com/repo/Centos-7.repo
yum install -y yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
2.5所有节点安装工具(选安)
yum install wget jq psmisc vim net-tools telnet yum-utils device-mapper-persistent-data lvm2 git lrzsz -y
2.6关闭防火墙
所有节点关闭firewalld 、dnsmasq、selinux(CentOS7需要关闭NetworkManager，CentOS8不需要)
systemctl disable --now firewalld
systemctl disable --now dnsmasq
systemctl disable --now NetworkManager
setenforce 0
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config
2.7关闭swap分区
所有节点关闭swap分区，fstab注释swap
swapoff -a && sysctl -w vm.swappiness=0
sed -ri '/^[^#]*swap/s@^@#@' /etc/fstab
2.8所有节点同步时间
下载ntpdate，所有节点同步时间
rpm -ivh http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
yum install ntpdate -y
#所有节点同步时间。时间同步配置如下：
ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
echo 'Asia/Shanghai' >/etc/timezone
ntpdate time2.aliyun.com
所有节点设置定时同步，加入到crontab
*/5 * * * * /usr/sbin/ntpdate time2.aliyun.com
2.9所有节点配置limit
ulimit -SHn 65535
vim /etc/security/limits.conf
# 末尾添加如下内容
* soft nofile 655360
* hard nofile 131072
* soft nproc 655350
* hard nproc 655350
* soft memlock unlimited
* hard memlock unlimited
2.10配置免密
参考集群中各机器免密登录远程主机:https://www.cnblogs.com/du-z/p/10901774.html
2.11所有节点升级系统
升级系统并重启
yum update -y --exclude=kernel* && reboot #CentOS7需要升级，CentOS8可以按需升级系统
2.12内核升级
CentOS7 需要升级内核至4.18+，本次升级的版本为4.19
2.12.1 master节点下载内核
cd /root
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm
wget http://193.49.22.109/elrepo/kernel/el7/x86_64/RPMS/kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm
2.12.2 从master节点传到其他节点：
for i in master1 master2 node1 node2 ;do scp kernel-ml-4.19.12-1.el7.elrepo.x86_64.rpm kernel-ml-devel-4.19.12-1.el7.elrepo.x86_64.rpm $i:/root/ ; done
2.12.3 所有节点安装内核
cd /root && yum localinstall -y kernel-ml*
2.12.4 所有节点更改内核启动顺序
grub2-set-default 0 && grub2-mkconfig -o /etc/grub2.cfg
grubby --args="user_namespace.enable=1" --update-kernel="$(grubby --default-kernel)"
2.12.5 所有节点检查默认内核是4.19
[root@master ~]# grubby --default-kernel
/boot/vmlinuz-4.19.12-1.el7.elrepo.x86_64
2.12.6 所有节点重启，然后检查内核是不是4.19(如果启动报错，可能是rpm下载错误)
所有节点重启
reboot
所有节点检查内核，master节点执行
for i in master1 master2 node1 node2 ;do ssh $i uname -a ; done
2.13所有节点安装配置ipvsadm
2.13.1 安装ipvsadm
yum install ipvsadm ipset sysstat conntrack libseccomp -y
2.13.2所有节点配置ipvs模块
在内核4.19+版本nf_conntrack_ipv4已经改为nf_conntrack， 4.18以下使用nf_conntrack_ipv4即可：
1.执行如下命令
modprobe -- ip_vs
modprobe -- ip_vs_rr
modprobe -- ip_vs_wrr
modprobe -- ip_vs_sh
modprobe -- nf_conntrack
2.编辑ipvs.conf
vim /etc/modules-load.d/ipvs.conf
# 加入以下内容
ip_vs
ip_vs_lc
ip_vs_wlc
ip_vs_rr
ip_vs_wrr
ip_vs_lblc
ip_vs_lblcr
ip_vs_dh
ip_vs_sh
ip_vs_fo
ip_vs_nq
ip_vs_sed
ip_vs_ftp
ip_vs_sh
nf_conntrack
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip
3.然后执行
systemctl enable --now systemd-modules-load.service
2.13.3检查是否加载
[root@master ~]# lsmod | grep -e ip_vs -e nf_conntrack
ip_vs_sh 16384 0
ip_vs_wrr 16384 0
ip_vs_rr 16384 0
ip_vs 151552 6 ip_vs_rr,ip_vs_sh,ip_vs_wrr
nf_conntrack 143360 1 ip_vs
nf_defrag_ipv6 20480 1 nf_conntrack
nf_defrag_ipv4 16384 1 nf_conntrack
libcrc32c 16384 3 nf_conntrack,xfs,ip_vs
#所有节点都检查下
for i in master1 master2 node1 node2 ;do ssh $i lsmod | grep -e ip_vs -e nf_conntrack ; done
2.14 开启一些k8s集群中必须的内核参数
1.所有节点配置k8s内核
cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 1
net.bridge.bridge-nf-call-ip6tables = 1
fs.may_detach_mounts = 1
vm.overcommit_memory=1
vm.panic_on_oom=0
fs.inotify.max_user_watches=89100
fs.file-max=52706963
fs.nr_open=52706963
net.netfilter.nf_conntrack_max=2310720
net.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp_keepalive_probes = 3
net.ipv4.tcp_keepalive_intvl =15
net.ipv4.tcp_max_tw_buckets = 36000
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_max_orphans = 327680
net.ipv4.tcp_orphan_retries = 3
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.ip_conntrack_max = 65536
net.ipv4.tcp_max_syn_backlog = 16384
net.ipv4.tcp_timestamps = 0
net.core.somaxconn = 16384
EOF
sysctl --system
2.所有节点配置完内核后，重启服务器，保证重启后内核依旧加载
reboot
lsmod | grep --color=auto -e ip_vs -e nf_conntrack
for i in master1 master2 node1 node2 ;do ssh $i lsmod | grep --color=auto -e ip_vs -e nf_conntrack ; done
3 高可用组件安装
3.1 所有master节点下载haproxy和keepalived
yum -y install haproxy keepalived
3.2 所有master节点配置haproxy （配置一样）
cat >/etc/haproxy/haproxy.cfg<<"EOF"
global
maxconn 2000
ulimit-n 16384
log 127.0.0.1 local0 err
stats timeout 30s
defaults
log global
mode http
option httplog
timeout connect 5000
timeout client 50000
timeout server 50000
timeout http-request 15s
timeout http-keep-alive 15s
frontend k8s-master
bind 0.0.0.0:8443
bind 127.0.0.1:8443
mode tcp
option tcplog
tcp-request inspect-delay 5s
default_backend k8s-master
backend k8s-master
mode tcp
option tcplog
option tcp-check
balance roundrobin
default-server inter 10s downinter 5s rise 2 fall 2 slowstart 60s maxconn 250 maxqueue 256 weight 100
server master1 192.168.75.13:6443 check
server master2 192.168.75.14:6443 check
server master 192.168.75.10:6443 check
EOF
3.3 所有master节点配置keepalived （注意主从配置不一样）
主master:
cat >/etc/keepalived/keepalived.conf<<"EOF"
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
script_user root
enable_script_security
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state MASTER
interface ens33
mcast_src_ip 192.168.75.10
virtual_router_id 51
priority 100
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.75.100
}
track_script {
chk_apiserver
}
}
EOF
从master1：
cat >/etc/keepalived/keepalived.conf<<"EOF"
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
script_user root
enable_script_security
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
mcast_src_ip 192.168.75.13
virtual_router_id 51
priority 99
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.75.100
}
track_script {
chk_apiserver
}
}
EOF
从master2：
cat >/etc/keepalived/keepalived.conf<<"EOF"
! Configuration File for keepalived
global_defs {
router_id LVS_DEVEL
script_user root
enable_script_security
}
vrrp_script chk_apiserver {
script "/etc/keepalived/check_apiserver.sh"
interval 5
weight -5
fall 2
rise 1
}
vrrp_instance VI_1 {
state BACKUP
interface ens33
mcast_src_ip 192.168.75.14
virtual_router_id 51
priority 99
advert_int 2
authentication {
auth_type PASS
auth_pass K8SHA_KA_AUTH
}
virtual_ipaddress {
192.168.75.100
}
track_script {
chk_apiserver
}
}
EOF
3.4 所有master节点配置健康检查脚本
cat >/etc/keepalived/check_apiserver.sh<<"EOF"
#!/bin/bash
err=0
for k in $(seq 1 3)
do
check_code=$(pgrep haproxy)
if [[ $check_code == "" ]]; then
err=$(expr $err + 1)
sleep 1
continue
else
err=0
break
fi
done
if [[ $err != "0" ]]; then
echo "systemctl stop keepalived"
/usr/bin/systemctl stop keepalived
exit 1
else
exit 0
fi
EOF
##给执行权限
chmod +x /etc/keepalived/check_apiserver.sh
##所有master节点启动haproxy和keepalived
systemctl daemon-reload
systemctl enable --now haproxy
systemctl enable --now keepalived
3.5测试vip
4 master节点执行配置证书工具cfssl
说明：
- cfssl是使用go编写，由CloudFlare开源的一款PKI/TLS工具。主要程序有：cfssl和cfssljson
- cfssl，是CFSSL的命令行工具;
- cfssljson用来从cfssl程序获取JSON输出，并将证书，密钥，CSR和bundle写入文件中。
4.1下载证书生成工具
cfssl的GitHub地址：https://github.com/cloudflare/cfssl/releases/tag/1.2.0
mkdir -p /data/k8s-work
cd /data/k8s-work
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssl-certinfo_linux-amd64
chmod +x cfssl*
mv cfssl_linux-amd64 /usr/local/bin/cfssl
mv cfssljson_linux-amd64 /usr/local/bin/cfssljson
mv cfssl-certinfo_linux-amd64 /usr/local/bin/cfssl-certinfo
[root@master k8s-work]# cfssl version
Version: 1.2.0
Revision: dev
Runtime: go1.6
4.2配置ca证书请求文件
cat > ca-csr.json <<"EOF"
{
"CN": "kubernetes",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "kubemsb",
"OU": "CN"
}
],
"ca": {
"expiry": "87600h"
}
}
EOF
4.3创建CA证书
[root@master k8s-work]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca
2023/03/31 14:59:24 [INFO] generating a new CA key and certificate from CSR
2023/03/31 14:59:24 [INFO] generate received request
2023/03/31 14:59:24 [INFO] received CSR
2023/03/31 14:59:24 [INFO] generating key: rsa-2048
2023/03/31 14:59:24 [INFO] encoded CSR
2023/03/31 14:59:24 [INFO] signed certificate with serial number 231911204899725544053777124560198335993393030085
[root@master k8s-work]# ls
ca.csr ca-csr.json ca-key.pem ca.pem
4.4配置ca证书策略
cfssl print-defaults config > ca-config.json
#或
cat > ca-config.json <<"EOF"
{
"signing": {
"default": {
"expiry": "87600h"
},
"profiles": {
"kubernetes": {
"usages": [
"signing",
"key encipherment",
"server auth",
"client auth"
],
"expiry": "87600h"
}
}
}
}
EOF
[root@master k8s-work]# ls
ca-config.json ca.csr ca-csr.json ca-key.pem ca.pem
#server auth 表示client可以对使用该ca对server提供的证书进行验证
#client auth 表示server可以使用该ca对client提供的证书进行验证
5 所有master节点安装etcd集群（非标注则在master节点执行）
5.1创建etcd证书
5.1.1 配置etcd请求文件
cd /data/k8s-work/
cat > etcd-csr.json <<"EOF"
{
"CN": "etcd",
"hosts": [
"127.0.0.1",
"192.168.75.10",
"192.168.75.13",
"192.168.75.14"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "kubemsb",
"OU": "CN"
}]
}
EOF
5.1.2生成etcd证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes etcd-csr.json | cfssljson -bare etcd
[root@master k8s-work]# ls
ca-config.json ca.csr ca-csr.json ca-key.pem ca.pem etcd.csr etcd-csr.json etcd-key.pem etcd.pem
5.2 下载etcd软件包
github地址：https://github.com/etcd-io/etcd/releases/
cd /data/k8s-work/
wget https://github.com/etcd-io/etcd/releases/download/v3.5.7/etcd-v3.5.7-linux-amd64.tar.gz
5.3解压etcd软件包
tar -xvf etcd-v3.5.7-linux-amd64.tar.gz
cp -p etcd-v3.5.7-linux-amd64/etcd* /usr/local/bin/
5.4分发etcd软件
scp etcd-v3.5.7-linux-amd64/etcd* master1:/usr/local/bin/
scp etcd-v3.5.7-linux-amd64/etcd* master2:/usr/local/bin/
[root@master1 ~]# etcdctl version
etcdctl version: 3.5.7
API version: 3.5
5.5所有master节点执行创建目录
mkdir -p /etc/etcd
mkdir -p /etc/etcd/ssl
mkdir -p /var/lib/etcd/default.etcd
5.6 创建etcd配置文件
cat > /etc/etcd/etcd.conf <<"EOF"
#[Member]
ETCD_NAME="etcd1"
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.75.10:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.75.10:2379,http://127.0.0.1:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.75.10:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.75.10:2379"
ETCD_INITIAL_CLUSTER="etcd1=https://192.168.75.10:2380,etcd2=https://192.168.75.13:2380,etcd3=https://192.168.75.14:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
#说明：
#ETCD_NAME：节点名称，集群中唯一
#ETCD_DATA_DIR：数据目录
#ETCD_LISTEN_PEER_URLS：集群通信监听地址
#ETCD_LISTEN_CLIENT_URLS：客户端访问监听地址
#ETCD_INITIAL_ADVERTISE_PEER_URLS：集群通告地址
#ETCD_ADVERTISE_CLIENT_URLS：客户端通告地址
#ETCD_INITIAL_CLUSTER：集群节点地址
#ETCD_INITIAL_CLUSTER_TOKEN：集群Token
#ETCD_INITIAL_CLUSTER_STATE：加入集群的当前状态，new是新集群，existing表示加入已有集群
5.7 其他master节点分别创建etcd配置文件
master1的etcd.conf文件
cat > /etc/etcd/etcd.conf <<"EOF"
#[Member]
ETCD_NAME="etcd2" #更改
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.75.13:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.75.13:2379,http://127.0.0.1:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.75.13:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.75.13:2379"
ETCD_INITIAL_CLUSTER="etcd1=https://192.168.75.10:2380,etcd2=https://192.168.75.13:2380,etcd3=https://192.168.75.14:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
master2的etcd.conf文件
cat > /etc/etcd/etcd.conf <<"EOF"
#[Member]
ETCD_NAME="etcd3" #更改
ETCD_DATA_DIR="/var/lib/etcd/default.etcd"
ETCD_LISTEN_PEER_URLS="https://192.168.75.14:2380"
ETCD_LISTEN_CLIENT_URLS="https://192.168.75.14:2379,http://127.0.0.1:2379"
#[Clustering]
ETCD_INITIAL_ADVERTISE_PEER_URLS="https://192.168.75.14:2380"
ETCD_ADVERTISE_CLIENT_URLS="https://192.168.75.14:2379"
ETCD_INITIAL_CLUSTER="etcd1=https://192.168.75.10:2380,etcd2=https://192.168.75.13:2380,etcd3=https://192.168.75.14:2380"
ETCD_INITIAL_CLUSTER_TOKEN="etcd-cluster"
ETCD_INITIAL_CLUSTER_STATE="new"
EOF
5.8 下发证书文件及创建服务配置文件etcd.service
官网选项：https://etcd.io/docs/v3.5/op-guide/configuration/
cd /data/k8s-work
cp ca*.pem /etc/etcd/ssl
cp etcd*.pem /etc/etcd/ssl
cat > /etc/systemd/system/etcd.service <<"EOF"
[Unit]
Description=Etcd Server
After=network.target
After=network-online.target
Wants=network-online.target
[Service]
Type=notify
EnvironmentFile=-/etc/etcd/etcd.conf
WorkingDirectory=/var/lib/etcd/
ExecStart=/usr/local/bin/etcd \
--cert-file=/etc/etcd/ssl/etcd.pem \
--key-file=/etc/etcd/ssl/etcd-key.pem \
--trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-cert-file=/etc/etcd/ssl/etcd.pem \
--peer-key-file=/etc/etcd/ssl/etcd-key.pem \
--peer-trusted-ca-file=/etc/etcd/ssl/ca.pem \
--peer-client-cert-auth \
--client-cert-auth
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
5.9 分发证书文件及服务配置文件
#分发证书文件
for i in master1 master2 ;do scp /etc/etcd/ssl/* $i:/etc/etcd/ssl ;done
#分发服务启动配置文件
for i in master2 master1 ;do scp /etc/systemd/system/etcd.service $i:/etc/systemd/system/ ;done
5.10 所有节点执行启动etcd集群
systemctl daemon-reload
systemctl enable --now etcd.service
systemctl status etcd
5.11 验证集群状态
[root@master k8s-work]# ETCDCTL_API=3 /usr/local/bin/etcdctl --write-out=table --cacert=/etc/etcd/ssl/ca.pem --cert=/etc/etcd/ssl/etcd.pem --key=/etc/etcd/ssl/etcd-key.pem --endpoints=https://192.168.75.10:2379,https://192.168.75.13:2379,https://192.168.75.14:2379 endpoint health
+----------------------------+--------+-------------+-------+
| ENDPOINT | HEALTH | TOOK | ERROR |
+----------------------------+--------+-------------+-------+
| https://192.168.75.10:2379 | true | 34.816151ms | |
| https://192.168.75.14:2379 | true | 34.000231ms | |
| https://192.168.75.13:2379 | true | 34.021782ms | |
+----------------------------+--------+-------------+-------+
6 kubernetes集群服务器二进制包（server-binaries）下载与分发 （master节点执行）
6.1 master节点载k8s安装包
github地址：https://github.com/kubernetes/kubernetes/blob/master/CHANGELOG/CHANGELOG-1.25.md#server-binaries
cd /data/k8s-work/
wget https://dl.k8s.io/v1.25.8/kubernetes-server-linux-amd64.tar.gz
6.2 k8s安装包解压
tar -xvf kubernetes-server-linux-amd64.tar.gz
6.3 k8s软件分发
cd kubernetes/server/bin/
cp kube-apiserver kube-controller-manager kube-scheduler kubectl /usr/local/bin/
scp kube-apiserver kube-controller-manager kube-scheduler kubectl master2:/usr/local/bin/
scp kube-apiserver kube-controller-manager kube-scheduler kubectl master1:/usr/local/bin/
scp kubelet kube-proxy master1:/usr/local/bin
scp kubelet kube-proxy master2:/usr/local/bin
scp kubelet kube-proxy master:/usr/local/bin
scp kubelet kube-proxy node1:/usr/local/bin
scp kubelet kube-proxy node2:/usr/local/bin
6.4 在集群所有节点创建目录
mkdir -p /etc/kubernetes/
mkdir -p /etc/kubernetes/ssl
mkdir -p /var/log/kubernetes
7 部署apiserver（master节点执行）
7.1创建apiserver证书
7.1.1创建apiserver证书请求文件
cd /data/k8s-work/
cat > kube-apiserver-csr.json << "EOF"
{
"CN": "kubernetes",
"hosts": [
"127.0.0.1",
"192.168.75.12",
"192.168.75.13",
"192.168.75.14",
"192.168.75.11",
"192.168.75.10",
"192.168.75.15",
"192.168.75.16",
"192.168.75.17",
"192.168.75.100",
"10.96.0.1",
"kubernetes",
"kubernetes.default",
"kubernetes.default.svc",
"kubernetes.default.svc.cluster",
"kubernetes.default.svc.cluster.local"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "kubemsb",
"OU": "CN"
}
]
}
EOF
#说明：
#1. 如果 hosts 字段不为空则需要指定授权使用该证书的 IP（含VIP） 或域名列表。由于该证书被集群使用，需要将节点的IP都填上，为了方便后期扩容可以多写几个预留的IP。
#2. 同时还需要填写 service 网络的首个IP(一般是 kube-apiserver 指定的 service-cluster-ip-range 网段的第一个IP，如 10.96.0.1)。
7.1.2生成apiserver的证书及token文件
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-apiserver-csr.json | cfssljson -bare kube-apiserver
7.1.3 配置TLS
cat > token.csv << EOF
$(head -c 16 /dev/urandom | od -An -t x | tr -d ' '),kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF
#说明：
#创建TLS机制所需TOKEN
#TLS Bootstraping：Master apiserver启用TLS认证后，Node节点kubelet和kube-proxy与kube-apiserver进行通信，必须使用CA签发的有效证书才可以，当Node节点很多时，这种客户端证书颁发需要大量工作，同样也会增加集群扩展复杂度。为了简化流程，Kubernetes引入了TLS bootstraping机制来自动颁发客户端证书，kubelet会以一个低权限用户自动向apiserver申请证书，kubelet的证书由apiserver动态签署。所以强烈建议在Node上使用这种方式，目前主要用于kubelet，kube-proxy还是由我们统一颁发一个证书。
[root@master k8s-work]# ls
ca-config.json etcd.csr etcd-v3.5.7-linux-amd64.tar.gz kubernetes
ca.csr etcd-csr.json kube-apiserver.csr kubernetes-server-linux-amd64.tar.gz
ca-csr.json etcd-key.pem kube-apiserver-csr.json token.csv
ca-key.pem etcd.pem kube-apiserver-key.pem
ca.pem etcd-v3.5.7-linux-amd64 kube-apiserver.pem
7.2 所有master节点创建apiserver服务配置文件
官网选项：https://kubernetes.io/zh-cn/docs/reference/command-line-tools-reference/kube-apiserver/
master节点：
cat > /etc/kubernetes/kube-apiserver.conf << "EOF"
KUBE_APISERVER_OPTS="--enable-admission-plugins=NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota \
--anonymous-auth=false \
--bind-address=192.168.75.10 \
--secure-port=6443 \
--advertise-address=192.168.75.10 \
--authorization-mode=Node,RBAC \
--runtime-config=api/all=true \
--enable-bootstrap-token-auth \
--service-cluster-ip-range=10.96.0.0/12 \
--token-auth-file=/etc/kubernetes/token.csv \
--service-node-port-range=30000-32767 \
--tls-cert-file=/etc/kubernetes/ssl/kube-apiserver.pem \
--tls-private-key-file=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--client-ca-file=/etc/kubernetes/ssl/ca.pem \
--kubelet-client-certificate=/etc/kubernetes/ssl/kube-apiserver.pem \
--kubelet-client-key=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-issuer=api \
--etcd-cafile=/etc/etcd/ssl/ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--etcd-servers=https://192.168.75.10:2379,https://192.168.75.13:2379,https://192.168.75.14:2379 \
--allow-privileged=true \
--apiserver-count=3 \
--audit-log-maxage=30 \
--audit-log-maxbackup=3 \
--audit-log-maxsize=100 \
--audit-log-path=/var/log/kube-apiserver-audit.log \
--event-ttl=1h \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=4"
EOF
master1节点：
cat > /etc/kubernetes/kube-apiserver.conf << "EOF"
KUBE_APISERVER_OPTS="--enable-admission-plugins=NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota \
--anonymous-auth=false \
--bind-address=192.168.75.13 \
--secure-port=6443 \
--advertise-address=192.168.75.13 \
--authorization-mode=Node,RBAC \
--runtime-config=api/all=true \
--enable-bootstrap-token-auth \
--service-cluster-ip-range=10.96.0.0/12 \
--token-auth-file=/etc/kubernetes/token.csv \
--service-node-port-range=30000-32767 \
--tls-cert-file=/etc/kubernetes/ssl/kube-apiserver.pem \
--tls-private-key-file=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--client-ca-file=/etc/kubernetes/ssl/ca.pem \
--kubelet-client-certificate=/etc/kubernetes/ssl/kube-apiserver.pem \
--kubelet-client-key=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-issuer=api \
--etcd-cafile=/etc/etcd/ssl/ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--etcd-servers=https://192.168.75.10:2379,https://192.168.75.13:2379,https://192.168.75.14:2379 \
--allow-privileged=true \
--apiserver-count=3 \
--audit-log-maxage=30 \
--audit-log-maxbackup=3 \
--audit-log-maxsize=100 \
--audit-log-path=/var/log/kube-apiserver-audit.log \
--event-ttl=1h \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=4"
EOF
master2节点：
cat > /etc/kubernetes/kube-apiserver.conf << "EOF"
KUBE_APISERVER_OPTS="--enable-admission-plugins=NamespaceLifecycle,NodeRestriction,LimitRanger,ServiceAccount,DefaultStorageClass,ResourceQuota \
--anonymous-auth=false \
--bind-address=192.168.75.14 \
--secure-port=6443 \
--advertise-address=192.168.75.14 \
--authorization-mode=Node,RBAC \
--runtime-config=api/all=true \
--enable-bootstrap-token-auth \
--service-cluster-ip-range=10.96.0.0/12 \
--token-auth-file=/etc/kubernetes/token.csv \
--service-node-port-range=30000-32767 \
--tls-cert-file=/etc/kubernetes/ssl/kube-apiserver.pem \
--tls-private-key-file=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--client-ca-file=/etc/kubernetes/ssl/ca.pem \
--kubelet-client-certificate=/etc/kubernetes/ssl/kube-apiserver.pem \
--kubelet-client-key=/etc/kubernetes/ssl/kube-apiserver-key.pem \
--service-account-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
--service-account-issuer=api \
--etcd-cafile=/etc/etcd/ssl/ca.pem \
--etcd-certfile=/etc/etcd/ssl/etcd.pem \
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \
--etcd-servers=https://192.168.75.10:2379,https://192.168.75.13:2379,https://192.168.75.14:2379 \
--allow-privileged=true \
--apiserver-count=3 \
--audit-log-maxage=30 \
--audit-log-maxbackup=3 \
--audit-log-maxsize=100 \
--audit-log-path=/var/log/kube-apiserver-audit.log \
--event-ttl=1h \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=4"
EOF
7.3 创建apiserver服务管理配置文件
cat > /etc/systemd/system/kube-apiserver.service << "EOF"
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=etcd.service
Wants=etcd.service
[Service]
EnvironmentFile=-/etc/kubernetes/kube-apiserver.conf
ExecStart=/usr/local/bin/kube-apiserver $KUBE_APISERVER_OPTS
Restart=on-failure
RestartSec=5
Type=notify
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
7.4 分发配置文件及证书 master节点执行
cp ca*.pem /etc/kubernetes/ssl/
cp kube-apiserver*.pem /etc/kubernetes/ssl/
cp token.csv /etc/kubernetes/
scp /etc/kubernetes/token.csv master1:/etc/kubernetes
scp /etc/kubernetes/token.csv master2:/etc/kubernetes
scp /etc/kubernetes/ssl/kube-apiserver*.pem master1:/etc/kubernetes/ssl
scp /etc/kubernetes/ssl/kube-apiserver*.pem master2:/etc/kubernetes/ssl
scp /etc/kubernetes/ssl/ca*.pem master1:/etc/kubernetes/ssl
scp /etc/kubernetes/ssl/ca*.pem master2:/etc/kubernetes/ssl
scp /etc/systemd/system/kube-apiserver.service master1:/etc/systemd/system/kube-apiserver.service
scp /etc/systemd/system/kube-apiserver.service master2:/etc/systemd/system/kube-apiserver.service
7.5 启动apiserver服务(所有master节点执行)
systemctl daemon-reload
systemctl enable --now kube-apiserver
systemctl status kube-apiserver
7.6 所有master节点测试连通性
curl --insecure https://192.168.75.10:6443/
curl --insecure https://192.168.75.13:6443/
curl --insecure https://192.168.75.14:6443/
curl --insecure https://192.168.75.100:8443/
[root@master k8s-work]# curl --insecure https://192.168.75.10:6443/
{
"kind": "Status",
"apiVersion": "v1",
"metadata": {},
"status": "Failure",
"message": "Unauthorized",
"reason": "Unauthorized",
"code": 401
}[root@master k8s-work]# curl --insecure https://192.168.75.13:6443/
{
"kind": "Status",
"apiVersion": "v1",
"metadata": {},
"status": "Failure",
"message": "Unauthorized",
"reason": "Unauthorized",
"code": 401
}[root@master k8s-work]# curl --insecure https://192.168.75.14:6443/
{
"kind": "Status",
"apiVersion": "v1",
"metadata": {},
"status": "Failure",
"message": "Unauthorized",
"reason": "Unauthorized",
"code": 401
}[root@master k8s-work]# curl --insecure https://192.168.75.100:8443/
{
"kind": "Status",
"apiVersion": "v1",
"metadata": {},
"status": "Failure",
"message": "Unauthorized",
"reason": "Unauthorized",
"code": 401
}[root@master k8s-work]#
8 部署kubectl
8.1创建kubectl证书
8.1.1创建kubectl证书请求文件
cd /data/k8s-work/
cat > admin-csr.json << "EOF"
{
"CN": "admin",
"hosts": [],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:masters",
"OU": "system"
}
]
}
EOF
#说明：
#后续 kube-apiserver 使用 RBAC 对客户端(如 kubelet、kube-proxy、Pod)请求进行授权；
#kube-apiserver 预定义了一些 RBAC 使用的 RoleBindings，如 cluster-admin 将 Group system:masters 与 Role cluster-admin 绑定，该 Role 授予了调用kube-apiserver 的所有 API的权限；
#O指定该证书的 Group 为 system:masters，kubelet 使用该证书访问 kube-apiserver 时 ，由于证书被 CA 签名，所以认证通过，同时由于证书用户组为经过预授权的 system:masters，所以被授予访问所有 API 的权限；
#注：
#这个admin 证书，是将来生成管理员用的kubeconfig 配置文件用的，现在我们一般建议使用RBAC 来对kubernetes 进行角色权限控制， kubernetes 将证书中的CN 字段 作为User， O 字段作为 Group；
#"O": "system:masters", 必须是system:masters，否则后面kubectl create clusterrolebinding报错。
8.1.2生成kubectl证书文件
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
[root@master k8s-work]# ls
admin.csr etcd-key.pem
admin-csr.json etcd.pem
admin-key.pem etcd-v3.5.7-linux-amd64
admin.pem etcd-v3.5.7-linux-amd64.tar.gz
ca-config.json kube-apiserver.csr
ca.csr kube-apiserver-csr.json
ca-csr.json kube-apiserver-key.pem
ca-key.pem kube-apiserver.pem
ca.pem kubernetes
etcd.csr kubernetes-server-linux-amd64.tar.gz
etcd-csr.json token.csv
8.1.3复制文件到指定目录
cp admin*.pem /etc/kubernetes/ssl/
scp admin*.pem master1:/etc/kubernetes/ssl/
scp admin*.pem master2:/etc/kubernetes/ssl/
8.2 生成kubeconfig配置文件
kube.config 为 kubectl 的配置文件，包含访问 apiserver 的所有信息，如 apiserver 地址、CA 证书和自身使用的证书
kubectl config set-cluster kubernetes --certificate-authority=ca.pem --embed-certs=true --server=https://192.168.75.100:8443 --kubeconfig=kube.config
kubectl config set-credentials admin --client-certificate=admin.pem --client-key=admin-key.pem --embed-certs=true --kubeconfig=kube.config
kubectl config set-context kubernetes --cluster=kubernetes --user=admin --kubeconfig=kube.config
kubectl config use-context kubernetes --kubeconfig=kube.config
8.3 准备kubectl配置文件并进行绑定
mkdir ~/.kube
cp kube.config ~/.kube/config
kubectl create clusterrolebinding kube-apiserver:kubelet-apis --clusterrole=system:kubelet-api-admin --user kubernetes --kubeconfig=/root/.kube/config
8.4 分发kubectl到其他master节点
ssh master1 mkdir /root/.kube
ssh master2 mkdir /root/.kube
scp /root/.kube/config master1:/root/.kube/config
scp /root/.kube/config master2:/root/.kube/config
8.5配置kubectl命令补全 （可选）
yum install -y bash-completion
source /usr/share/bash-completion/bash_completion
source <(kubectl completion bash)
kubectl completion bash > ~/.kube/completion.bash.inc
source '/root/.kube/completion.bash.inc'
source $HOME/.bash_profile
8.6 测试
[root@master1 ~]# kubectl get all --all-namespaces #查看集群所有资源
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
default service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 4h
[root@master1 ~]# kubectl get componentstatuses #查看集群组件状态
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
scheduler Unhealthy Get "https://127.0.0.1:10259/healthz": dial tcp 127.0.0.1:10259: connect: connection refused
controller-manager Unhealthy Get "https://127.0.0.1:10257/healthz": dial tcp 127.0.0.1:10257: connect: connection refused
etcd-1 Healthy {"health":"true","reason":""}
etcd-0 Healthy {"health":"true","reason":""}
etcd-2 Healthy {"health":"true","reason":""}
[root@master1 ~]# kubectl cluster-info #查看集群信息
Kubernetes control plane is running at https://192.168.75.100:8443
To further debug and diagnose cluster problems, use 'kubectl cluster-info dump'.
[root@master1 ~]#
9 部署kube-controller-manager
9.1 创建kube-controller-manager证书
9.1.1 创建kube-controller-manager证书请求文件
cd /data/k8s-work/
cat > kube-controller-manager-csr.json << "EOF"
{
"CN": "system:kube-controller-manager",
"key": {
"algo": "rsa",
"size": 2048
},
"hosts": [
"127.0.0.1",
"192.168.75.10",
"192.168.75.13",
"192.168.75.14"
],
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-controller-manager",
"OU": "system"
}
]
}
EOF
#说明：
#hosts 列表包含所有 kube-controller-manager 节点 IP；
#CN 为 system:kube-controller-manager;
#O 为 system:kube-controller-manager，kubernetes 内置的 ClusterRoleBindings system:kube-controller-manager 赋予 kube-controller-manager 工作所需的权限
9.1.2创建kube-controller-manager证书文件
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-controller-manager-csr.json | cfssljson -bare kube-controller-manager
9.2 创建服务的启动文件kube-controller-manager.service
cat > kube-controller-manager.service << "EOF"
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/etc/kubernetes/kube-controller-manager.conf
ExecStart=/usr/local/bin/kube-controller-manager $KUBE_CONTROLLER_MANAGER_OPTS
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
9.3 创建kube-controller-manager的配置文件kube-controller-manager.config
官网选项：https://kubernetes.io/zh-cn/docs/reference/command-line-tools-reference/kube-controller-manager/
cat > kube-controller-manager.conf << "EOF"
KUBE_CONTROLLER_MANAGER_OPTS=" \
--secure-port=10257 \
--bind-address=127.0.0.1 \
--kubeconfig=/etc/kubernetes/kube-controller-manager.kubeconfig \
--service-cluster-ip-range=10.96.0.0/12 \
--cluster-name=kubernetes \
--cluster-signing-cert-file=/etc/kubernetes/ssl/ca.pem \
--cluster-signing-key-file=/etc/kubernetes/ssl/ca-key.pem \
--allocate-node-cidrs=true \
--cluster-cidr=172.16.0.0/12 \
--root-ca-file=/etc/kubernetes/ssl/ca.pem \
--service-account-private-key-file=/etc/kubernetes/ssl/ca-key.pem \
--leader-elect=true \
--feature-gates=RotateKubeletServerCertificate=true \
--controllers=*,bootstrapsigner,tokencleaner \
--horizontal-pod-autoscaler-sync-period=10s \
--tls-cert-file=/etc/kubernetes/ssl/kube-controller-manager.pem \
--tls-private-key-file=/etc/kubernetes/ssl/kube-controller-manager-key.pem \
--use-service-account-credentials=true \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=2"
EOF
9.4 创建kube-controller-manager的kube-controller-manager.kubeconfig
kubectl config set-cluster kubernetes --certificate-authority=ca.pem --embed-certs=true --server=https://192.168.75.100:8443 --kubeconfig=kube-controller-manager.kubeconfig
kubectl config set-credentials system:kube-controller-manager --client-certificate=kube-controller-manager.pem --client-key=kube-controller-manager-key.pem --embed-certs=true --kubeconfig=kube-controller-manager.kubeconfig
kubectl config set-context system:kube-controller-manager --cluster=kubernetes --user=system:kube-controller-manager --kubeconfig=kube-controller-manager.kubeconfig
kubectl config use-context system:kube-controller-manager --kubeconfig=kube-controller-manager.kubeconfig
9.5 同步文件到集群所有master节点
scp kube-controller-manager*.pem master1:/etc/kubernetes/ssl/
scp kube-controller-manager*.pem master2:/etc/kubernetes/ssl/
scp kube-controller-manager*.pem master:/etc/kubernetes/ssl/
scp kube-controller-manager.kubeconfig kube-controller-manager.conf master1:/etc/kubernetes/
scp kube-controller-manager.kubeconfig kube-controller-manager.conf master2:/etc/kubernetes/
scp kube-controller-manager.kubeconfig kube-controller-manager.conf master:/etc/kubernetes/
scp kube-controller-manager.service master1:/usr/lib/systemd/system/
scp kube-controller-manager.service master2:/usr/lib/systemd/system/
scp kube-controller-manager.service master:/usr/lib/systemd/system/
9.6 启动服务(所有master节点执行)
systemctl daemon-reload
systemctl restart kube-controller-manager
systemctl enable --now kube-controller-manager
systemctl status kube-controller-manager
9.7 检查
kubectl get componentstatuses
[root@master2 bin]# kubectl get componentstatuses
Warning: v1 ComponentStatus is deprecated in v1.19+
NAME STATUS MESSAGE ERROR
scheduler Unhealthy Get "https://127.0.0.1:10259/healthz": dial tcp 127.0.0.1:10259: connect: connection refused
controller-manager Healthy ok ###变为ok
etcd-2 Healthy {"health":"true","reason":""}
etcd-1 Healthy {"health":"true","reason":""}
etcd-0 Healthy {"health":"true","reason":""}
10 部署kube-scheduler
10.1 创建kube-schedule证书
10.1.1 创建kube-schedule证书请求文件
cd /data/k8s-work/
cat > kube-scheduler-csr.json << "EOF"
{
"CN": "system:kube-scheduler",
"hosts": [
"127.0.0.1",
"192.168.75.10",
"192.168.75.13",
"192.168.75.14"
],
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "system:kube-scheduler",
"OU": "system"
}
]
}
EOF
10.1.2 生成kube-schedule证书文件
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler
10.2 创建kube-schedule的kubeconfig
kubectl config set-cluster kubernetes --certificate-authority=ca.pem --embed-certs=true --server=https://192.168.75.100:8443 --kubeconfig=kube-scheduler.kubeconfig
kubectl config set-credentials system:kube-scheduler --client-certificate=kube-scheduler.pem --client-key=kube-scheduler-key.pem --embed-certs=true --kubeconfig=kube-scheduler.kubeconfig
kubectl config set-context system:kube-scheduler --cluster=kubernetes --user=system:kube-scheduler --kubeconfig=kube-scheduler.kubeconfig
kubectl config use-context system:kube-scheduler --kubeconfig=kube-scheduler.kubeconfig
10.3 创建服务配置文件kube-scheduler.conf
官网选项：https://kubernetes.io/zh-cn/docs/reference/command-line-tools-reference/kube-scheduler/
cat > kube-scheduler.conf << "EOF"
KUBE_SCHEDULER_OPTS=" \
--kubeconfig=/etc/kubernetes/kube-scheduler.kubeconfig \
--leader-elect=true \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=2"
EOF
10.4 创建服务管理配置文件kube-scheduler.service
cat > kube-scheduler.service << "EOF"
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
[Service]
EnvironmentFile=-/etc/kubernetes/kube-scheduler.conf
ExecStart=/usr/local/bin/kube-scheduler $KUBE_SCHEDULER_OPTS
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
10.5 分发证书及文件
scp kube-scheduler*.pem master1:/etc/kubernetes/ssl/
scp kube-scheduler*.pem master2:/etc/kubernetes/ssl/
scp kube-scheduler*.pem master:/etc/kubernetes/ssl/
scp kube-scheduler.kubeconfig kube-scheduler.conf master1:/etc/kubernetes/
scp kube-scheduler.kubeconfig kube-scheduler.conf master2:/etc/kubernetes/
scp kube-scheduler.kubeconfig kube-scheduler.conf master:/etc/kubernetes/
scp kube-scheduler.service master1:/usr/lib/systemd/system/
scp kube-scheduler.service master2:/usr/lib/systemd/system/
scp kube-scheduler.service master:/usr/lib/systemd/system/
10.6 启动服务
systemctl daemon-reload
systemctl enable --now kube-scheduler
systemctl status kube-scheduler
开始node节点
11 安装Containerd
github项目推荐文档，安装containerd：https://github.com/containerd/containerd/blob/main/docs/getting-started.md
11.1 下载containerd安装包并解压
github地址：https://github.com/containerd/containerd/releases
cd /data/k8s-work/
wget https://github.com/containerd/containerd/releases/download/v1.6.19/cri-containerd-cni-1.6.19-linux-amd64.tar.gz
tar -xvf cri-containerd-cni-1.6.19-linux-amd64.tar.gz -C /
11.2 生成配置文件config.toml
cat > config.toml<<EOF
root = "/var/lib/containerd"
state = "/run/containerd"
oom_score = -999
[grpc]
address = "/run/containerd/containerd.sock"
uid = 0
gid = 0
max_recv_message_size = 16777216
max_send_message_size = 16777216
[debug]
address = ""
uid = 0
gid = 0
level = ""
[metrics]
address = ""
grpc_histogram = false
[cgroup]
path = ""
[plugins]
[plugins.cgroups]
no_prometheus = false
[plugins.cri]
stream_server_address = "127.0.0.1"
stream_server_port = "0"
enable_selinux = false
sandbox_image = "registry.aliyuncs.com/google_containers/pause:3.6"
stats_collect_period = 10
systemd_cgroup = true
enable_tls_streaming = false
max_container_log_line_size = 16384
[plugins.cri.containerd]
snapshotter = "overlayfs"
no_pivot = false
[plugins.cri.containerd.default_runtime]
runtime_type = "io.containerd.runtime.v1.linux"
runtime_engine = ""
runtime_root = ""
[plugins.cri.containerd.untrusted_workload_runtime]
runtime_type = ""
runtime_engine = ""
runtime_root = ""
[plugins.cri.cni]
bin_dir = "/opt/cni/bin"
conf_dir = "/etc/cni/net.d"
conf_template = "/etc/cni/net.d/10-default.conf"
[plugins.cri.registry]
[plugins.cri.registry.mirrors]
[plugins.cri.registry.mirrors."docker.io"]
endpoint = [
"https://docker.mirrors.ustc.edu.cn",
"http://hub-mirror.c.163.com"
]
[plugins.cri.registry.mirrors."gcr.io"]
endpoint = [
"https://gcr.mirrors.ustc.edu.cn"
]
[plugins.cri.registry.mirrors."k8s.gcr.io"]
endpoint = [
"https://gcr.mirrors.ustc.edu.cn/google-containers/"
]
[plugins.cri.registry.mirrors."quay.io"]
endpoint = [
"https://quay.mirrors.ustc.edu.cn"
]
[plugins.cri.x509_key_pair_streaming]
tls_cert_file = ""
tls_key_file = ""
[plugins.diff-service]
default = ["walking"]
[plugins.linux]
shim = "containerd-shim"
runtime = "runc"
runtime_root = ""
no_shim = false
shim_debug = false
[plugins.opt]
path = "/opt/containerd"
[plugins.restart]
interval = "10s"
[plugins.scheduler]
pause_threshold = 0.02
deletion_threshold = 0
mutation_threshold = 100
schedule_delay = "0s"
startup_delay = "100ms"
EOF
11.3 安装runc
github地址：https://github.com/opencontainers/runc/releases
cd /data/k8s-work/
wget https://github.com/opencontainers/runc/releases/download/v1.1.4/runc.amd64
chmod +x runc.amd64
11.4 分发配置文件
ssh master mkdir /etc/containerd
ssh master1 mkdir /etc/containerd
ssh master2 mkdir /etc/containerd
ssh node1 mkdir /etc/containerd
ssh node2 mkdir /etc/containerd
scp /data/k8s-work/config.toml master:/etc/containerd/config.toml
scp /data/k8s-work/config.toml master1:/etc/containerd/config.toml
scp /data/k8s-work/config.toml master2:/etc/containerd/config.toml
scp /data/k8s-work/config.toml node1:/etc/containerd/config.toml
scp /data/k8s-work/config.toml node2:/etc/containerd/config.toml
scp /data/k8s-work/cri-containerd-cni-1.6.19-linux-amd64.tar.gz master1:/root/
scp /data/k8s-work/cri-containerd-cni-1.6.19-linux-amd64.tar.gz master2:/root/
scp /data/k8s-work/cri-containerd-cni-1.6.19-linux-amd64.tar.gz node1:/root/
scp /data/k8s-work/cri-containerd-cni-1.6.19-linux-amd64.tar.gz node2:/root/
scp runc.amd64 master:/usr/local/sbin/runc
scp runc.amd64 master1:/usr/local/sbin/runc
scp runc.amd64 master2:/usr/local/sbin/runc
scp runc.amd64 node1:/usr/local/sbin/runc
scp runc.amd64 node2:/usr/local/sbin/runc
11.5 集群其他每个节点解压软件包
tar -xvf /root/cri-containerd-cni-1.6.19-linux-amd64.tar.gz -C /
11.6 集群所有节点启动containerd
systemctl enable containerd
systemctl restart containerd
systemctl status containerd
12 部署kubelet (主要还是master执行)
12.1 创建kubelet-bootstrap.kubeconfig文件
cd /data/k8s-work/
BOOTSTRAP_TOKEN=$(awk -F "," '{print $1}' /etc/kubernetes/token.csv)
kubectl config set-cluster kubernetes --certificate-authority=ca.pem --embed-certs=true --server=https://192.168.75.100:8443 --kubeconfig=kubelet-bootstrap.kubeconfig
kubectl config set-credentials kubelet-bootstrap --token=${BOOTSTRAP_TOKEN} --kubeconfig=kubelet-bootstrap.kubeconfig
kubectl config set-context default --cluster=kubernetes --user=kubelet-bootstrap --kubeconfig=kubelet-bootstrap.kubeconfig
kubectl config use-context default --kubeconfig=kubelet-bootstrap.kubeconfig
创建clusterrolebingding角色资源
kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=kubelet-bootstrap
kubectl create clusterrolebinding kubelet-bootstrap --clusterrole=system:node-bootstrapper --user=kubelet-bootstrap --kubeconfig=kubelet-bootstrap.kubeconfig
kubectl describe clusterrolebinding cluster-system-anonymous
kubectl describe clusterrolebinding kubelet-bootstrap
12.2 创建kubelet配置文件kubelet-conf.yaml
配置conf.yml结构参考官网：
https://kubernetes.io/zh-cn/docs/reference/config-api/kubelet-config.v1beta1/
https://kubernetes.io/docs/tasks/administer-cluster/kubelet-config-file/
cat > kubelet-conf.yaml << "EOF"
apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 192.168.75.10 #修改为本节点地址
port: 10250
readOnlyPort: 10255
serializeImagePulls: false
evictionHard:
memory.available: "200Mi"
authentication:
anonymous:
enabled: false
webhook:
cacheTTL: 2m0s
enabled: true
x509:
clientCAFile: /etc/kubernetes/ssl/ca.pem
authorization:
mode: Webhook
webhook:
cacheAuthorizedTTL: 5m0s
cacheUnauthorizedTTL: 30s
cgroupDriver: systemd # 如果docker的驱动为systemd，处修改为systemd。此处设置很重要
cgroupsPerQOS: true
clusterDNS:
- 10.96.0.2
clusterDomain: cluster.local
EOF
12.3 创建kubelet管理配置文件kubelet.service
cat > kubelet.service << "EOF"
[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=docker.service
Requires=docker.service
[Service]
EnvironmentFile=-/etc/kubernetes/kubelet.conf
ExecStart=/usr/local/bin/kubelet $KUBELET_OPTS
Restart=on-failure
RestartSec=5
[Install]
WantedBy=multi-user.target
EOF
12.4 创建kubelet服务配置文件kubelet.conf
官网选项：https://kubernetes.io/zh-cn/docs/reference/command-line-tools-reference/kubelet/
| 运行时（--container-runtime-endpoint） | Unix 域套接字 |
|---|---|
| containerd | unix:///var/run/containerd/containerd.sock |
| CRI-O | unix:///var/run/crio/crio.sock |
| Docker Engine（使用 cri-dockerd） | unix:///var/run/cri-dockerd.sock |
cat > kubelet.conf << EOF
KUBELET_OPTS="\
--bootstrap-kubeconfig=/etc/kubernetes/kubelet-bootstrap.kubeconfig \
--cert-dir=/etc/kubernetes/ssl \
--kubeconfig=/etc/kubernetes/kubelet.kubeconfig \
--config=/etc/kubernetes/kubelet-conf.yaml \
--container-runtime-endpoint=unix:///run/containerd/containerd.sock \
--container-runtime-endpoint=unix:///run/containerd/containerd.sock \
--rotate-certificates \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=2"
EOF
12.5 分发配置文件
scp kubelet-bootstrap.kubeconfig master:/etc/kubernetes/
scp kubelet-bootstrap.kubeconfig master1:/etc/kubernetes/
scp kubelet-bootstrap.kubeconfig master2:/etc/kubernetes/
scp kubelet-bootstrap.kubeconfig node1:/etc/kubernetes/
scp kubelet-bootstrap.kubeconfig node2:/etc/kubernetes/
scp kubelet-conf.yaml master:/etc/kubernetes/
scp kubelet-conf.yaml master1:/etc/kubernetes/
scp kubelet-conf.yaml master2:/etc/kubernetes/
scp kubelet-conf.yaml node1:/etc/kubernetes/
scp kubelet-conf.yaml node2:/etc/kubernetes/
scp kubelet.conf master:/etc/kubernetes/
scp kubelet.conf master1:/etc/kubernetes/
scp kubelet.conf master2:/etc/kubernetes/
scp kubelet.conf node1:/etc/kubernetes/
scp kubelet.conf node2:/etc/kubernetes/
scp ca.pem master:/etc/kubernetes/ssl/
scp ca.pem master1:/etc/kubernetes/ssl/
scp ca.pem master2:/etc/kubernetes/ssl/
scp ca.pem node1:/etc/kubernetes/ssl/
scp ca.pem node2:/etc/kubernetes/ssl/
scp kubelet.service master:/usr/lib/systemd/system/
scp kubelet.service master1:/usr/lib/systemd/system/
scp kubelet.service master2:/usr/lib/systemd/system/
scp kubelet.service node1:/usr/lib/systemd/system/
scp kubelet.service node2:/usr/lib/systemd/system/
scp /usr/local/bin/kube* node1:/usr/local/bin/
scp /usr/local/bin/kube* node2:/usr/local/bin/
12.6修正kubelet.json文件中的主机ip
ssh master1 sed -i s#192.168.75.10#192.168.75.13#g /etc/kubernetes/kubelet-conf.yaml
ssh master2 sed -i s#192.168.75.10#192.168.75.14#g /etc/kubernetes/kubelet-conf.yaml
ssh node1 sed -i s#192.168.75.10#192.168.75.11#g /etc/kubernetes/kubelet-conf.yaml
ssh node2 sed -i s#192.168.75.10#192.168.75.12#g /etc/kubernetes/kubelet-conf.yaml
12.7 创建目录启动服务（所有节点执行）
mkdir -p /var/lib/kubelet
mkdir -p /var/log/kubernetes
systemctl daemon-reload
systemctl enable --now kubelet
systemctl restart kubelet
systemctl status kubelet
12.8 检查
[root@master k8s-work]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master Ready <none> 30m v1.25.8
master1 Ready <none> 90s v1.25.8
master2 Ready <none> 20s v1.25.8
node1 Ready <none> 14s v1.25.8
node2 Ready <none> 8s v1.25.8
13 部署kube-proxy
13.1 创建kube-proxy证书请求文件
cd /data/k8s-work/
cat > kube-proxy-csr.json << "EOF"
{
"CN": "system:kube-proxy",
"key": {
"algo": "rsa",
"size": 2048
},
"names": [
{
"C": "CN",
"ST": "Beijing",
"L": "Beijing",
"O": "kubemsb",
"OU": "CN"
}
]
}
EOF
13.2 生成证书
cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
# ls kube-proxy*
kube-proxy.csr kube-proxy-csr.json kube-proxy-key.pem kube-proxy.pem
13.3 创建kubeconfig文件
kubectl config set-cluster kubernetes --certificate-authority=ca.pem --embed-certs=true --server=https://192.168.75.100:8443 --kubeconfig=kube-proxy.kubeconfig
kubectl config set-credentials kube-proxy --client-certificate=kube-proxy.pem --client-key=kube-proxy-key.pem --embed-certs=true --kubeconfig=kube-proxy.kubeconfig
kubectl config set-context default --cluster=kubernetes --user=kube-proxy --kubeconfig=kube-proxy.kubeconfig
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig
13.4 创建服务配置文件kube-proxy.yaml
cat > kube-proxy.yaml << "EOF"
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: 192.168.75.10
clientConnection:
kubeconfig: /etc/kubernetes/kube-proxy.kubeconfig
clusterCIDR: 172.16.0.0/12
healthzBindAddress: 192.168.75.10:10256
kind: KubeProxyConfiguration
metricsBindAddress: 192.168.75.10:10249
mode: "ipvs"
EOF
13.5 创建服务管理文件kube-proxy.service
官网选项：https://kubernetes.io/zh-cn/docs/reference/command-line-tools-reference/kube-proxy/
cat > kube-proxy.service << "EOF"
[Unit]
Description=Kubernetes Kube-Proxy Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target
[Service]
WorkingDirectory=/var/lib/kube-proxy
ExecStart=/usr/local/bin/kube-proxy \
--config=/etc/kubernetes/kube-proxy.yaml \
--alsologtostderr=true \
--logtostderr=false \
--log-dir=/var/log/kubernetes \
--v=2
Restart=on-failure
RestartSec=5
LimitNOFILE=65536
[Install]
WantedBy=multi-user.target
EOF
13.6分发配置文件
scp kube-proxy*.pem master:/etc/kubernetes/ssl/
scp kube-proxy*.pem master1:/etc/kubernetes/ssl/
scp kube-proxy*.pem master2:/etc/kubernetes/ssl/
scp kube-proxy*.pem node1:/etc/kubernetes/ssl/
scp kube-proxy*.pem node2:/etc/kubernetes/ssl/
scp kube-proxy.kubeconfig master:/etc/kubernetes/
scp kube-proxy.kubeconfig master1:/etc/kubernetes/
scp kube-proxy.kubeconfig master2:/etc/kubernetes/
scp kube-proxy.kubeconfig node1:/etc/kubernetes/
scp kube-proxy.kubeconfig node2:/etc/kubernetes/
scp kube-proxy.yaml master:/etc/kubernetes/
scp kube-proxy.yaml master1:/etc/kubernetes/
scp kube-proxy.yaml master2:/etc/kubernetes/
scp kube-proxy.yaml node1:/etc/kubernetes/
scp kube-proxy.yaml node2:/etc/kubernetes/
scp kube-proxy.service master:/usr/lib/systemd/system/
scp kube-proxy.service master1:/usr/lib/systemd/system/
scp kube-proxy.service master2:/usr/lib/systemd/system/
scp kube-proxy.service node1:/usr/lib/systemd/system/
scp kube-proxy.service node2:/usr/lib/systemd/system/
13.7 修改kube-proxy.yaml文件中的地址
ssh master1 sed -i s#192.168.75.10#192.168.75.13#g /etc/kubernetes/kube-proxy.yaml
ssh master2 sed -i s#192.168.75.10#192.168.75.14#g /etc/kubernetes/kube-proxy.yaml
ssh node1 sed -i s#192.168.75.10#192.168.75.11#g /etc/kubernetes/kube-proxy.yaml
ssh node2 sed -i s#192.168.75.10#192.168.75.12#g /etc/kubernetes/kube-proxy.yaml
13.8 创建工作目录
for i in master master1 master2 node1 node2 ;do ssh $i mkdir -p /var/lib/kube-proxy ;done
13.8启动服务
systemctl daemon-reload
systemctl enable --now kube-proxy
systemctl restart kube-proxy
systemctl status kube-proxy
14 部署calico
14.1 获取安装calico的manifest（清单）
官网安装教程：https://docs.tigera.io/calico/3.24/getting-started/kubernetes/self-managed-onprem/onpremises
curl https://raw.githubusercontent.com/projectcalico/calico/v3.24.5/manifests/calico.yaml -O
14.2 修改pod CALICO_IPV4POOL_CIDR
#注意缩进
4551 - name: CALICO_IPV4POOL_CIDR
4552 value: "172.16.0.0/12"
14.3 apply文件安装
kubectl apply -f calico.yaml
14.4 检查
[root@master k8s-work]# kubectl get pods -A -o wide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
kube-system calico-kube-controllers-798cc86c47-9kdgn 1/1 Running 0 3h11m 10.88.2.89 node1 <none> <none>
kube-system calico-node-7nx46 1/1 Running 0 124m 192.168.75.12 node2 <none> <none>
kube-system calico-node-fzk4f 1/1 Running 0 124m 192.168.75.14 master2 <none> <none>
kube-system calico-node-ld94g 1/1 Running 0 124m 192.168.75.13 master1 <none> <none>
kube-system calico-node-pkmrd 1/1 Running 0 124m 192.168.75.11 node1 <none> <none>
kube-system calico-node-rvq8x 1/1 Running 0 124m 192.168.75.10 master <none> <none>
15 部署core DNS
15.1 创建部署文件coredns.yaml
cd /data/k8s-work/
cat > coredns.yaml << "EOF"
apiVersion: v1
kind: ServiceAccount
metadata:
name: coredns
namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
rules:
- apiGroups:
- ""
resources:
- endpoints
- services
- pods
- namespaces
verbs:
- list
- watch
- apiGroups:
- discovery.k8s.io
resources:
- endpointslices
verbs:
- list
- watch
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
annotations:
rbac.authorization.kubernetes.io/autoupdate: "true"
labels:
kubernetes.io/bootstrapping: rbac-defaults
name: system:coredns
roleRef:
apiGroup: rbac.authorization.k8s.io
kind: ClusterRole
name: system:coredns
subjects:
- kind: ServiceAccount
name: coredns
namespace: kube-system
---
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns
namespace: kube-system
data:
Corefile: |
.:53 {
errors
health {
lameduck 5s
}
ready
kubernetes cluster.local in-addr.arpa ip6.arpa {
fallthrough in-addr.arpa ip6.arpa
}
prometheus :9153
forward . /etc/resolv.conf {
max_concurrent 1000
}
cache 30
loop
reload
loadbalance
}
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: coredns
namespace: kube-system
labels:
k8s-app: kube-dns
kubernetes.io/name: "CoreDNS"
spec:
# replicas: not specified here:
# 1. Default is 1.
# 2. Will be tuned in real time if DNS horizontal auto-scaling is turned on.
strategy:
type: RollingUpdate
rollingUpdate:
maxUnavailable: 1
selector:
matchLabels:
k8s-app: kube-dns
template:
metadata:
labels:
k8s-app: kube-dns
spec:
priorityClassName: system-cluster-critical
serviceAccountName: coredns
tolerations:
- key: "CriticalAddonsOnly"
operator: "Exists"
nodeSelector:
kubernetes.io/os: linux
affinity:
podAntiAffinity:
preferredDuringSchedulingIgnoredDuringExecution:
- weight: 100
podAffinityTerm:
labelSelector:
matchExpressions:
- key: k8s-app
operator: In
values: ["kube-dns"]
topologyKey: kubernetes.io/hostname
containers:
- name: coredns
image: coredns/coredns:1.8.4
imagePullPolicy: IfNotPresent
resources:
limits:
memory: 170Mi
requests:
cpu: 100m
memory: 70Mi
args: [ "-conf", "/etc/coredns/Corefile" ]
volumeMounts:
- name: config-volume
mountPath: /etc/coredns
readOnly: true
ports:
- containerPort: 53
name: dns
protocol: UDP
- containerPort: 53
name: dns-tcp
protocol: TCP
- containerPort: 9153
name: metrics
protocol: TCP
securityContext:
allowPrivilegeEscalation: false
capabilities:
add:
- NET_BIND_SERVICE
drop:
- all
readOnlyRootFilesystem: true
livenessProbe:
httpGet:
path: /health
port: 8080
scheme: HTTP
initialDelaySeconds: 60
timeoutSeconds: 5
successThreshold: 1
failureThreshold: 5
readinessProbe:
httpGet:
path: /ready
port: 8181
scheme: HTTP
dnsPolicy: Default
volumes:
- name: config-volume
configMap:
name: coredns
items:
- key: Corefile
path: Corefile
---
apiVersion: v1
kind: Service
metadata:
name: kube-dns
namespace: kube-system
annotations:
prometheus.io/port: "9153"
prometheus.io/scrape: "true"
labels:
k8s-app: kube-dns
kubernetes.io/cluster-service: "true"
kubernetes.io/name: "CoreDNS"
spec:
selector:
k8s-app: kube-dns
clusterIP: 10.96.0.2
ports:
- name: dns
port: 53
protocol: UDP
- name: dns-tcp
port: 53
protocol: TCP
- name: metrics
port: 9153
protocol: TCP
EOF
15.2 部署coredns
kubectl apply -f coredns.yaml
15.3 检查
[root@master k8s-work]# kubectl get pods -A -o wide | grep dns
kube-system coredns-564fd8c776-c8prw 1/1 Running 0 53s 172.27.205.129 master <none> <none>
[root@master k8s-work]#
到这里k8s集群已经搭建完成
查看集群节点的信息
[root@master ~]# kubectl get nodes -o wide
NAME STATUS ROLES AGE VERSION INTERNAL-IP EXTERNAL-IP OS-IMAGE KERNEL-VERSION CONTAINER-RUNTIME
master Ready <none> 25h v1.25.8 192.168.75.10 <none> CentOS Linux 7 (Core) 4.19.12-1.el7.elrepo.x86_64 containerd://1.6.19
master1 Ready <none> 25h v1.25.8 192.168.75.13 <none> CentOS Linux 7 (Core) 4.19.12-1.el7.elrepo.x86_64 containerd://1.6.19
master2 Ready <none> 25h v1.25.8 192.168.75.14 <none> CentOS Linux 7 (Core) 4.19.12-1.el7.elrepo.x86_64 containerd://1.6.19
node1 Ready <none> 25h v1.25.8 192.168.75.11 <none> CentOS Linux 7 (Core) 4.19.12-1.el7.elrepo.x86_64 containerd://1.6.19
node2 Ready <none> 25h v1.25.8 192.168.75.12 <none> CentOS Linux 7 (Core) 4.19.12-1.el7.elrepo.x86_64 containerd://1.6.19
16 部署应用验证
16.2创建部署文件
cat > nginx.yaml << "EOF"
---
apiVersion: v1
kind: ReplicationController
metadata:
name: nginx-web
spec:
replicas: 2
selector:
name: nginx
template:
metadata:
labels:
name: nginx
spec:
containers:
- name: nginx
image: nginx:1.19.6
ports:
- containerPort: 80
---
apiVersion: v1
kind: Service
metadata:
name: nginx-service-nodeport
spec:
ports:
- port: 80
targetPort: 80
nodePort: 30001
protocol: TCP
type: NodePort
selector:
name: nginx
EOF
16.3 apply
kubectl apply -f nginx.yaml
16.4 验证
[root@master k8s-work]# kubectl get pods -A -o wide
NAMESPACE NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
default nginx-web-lr25s 1/1 Running 0 38s 172.27.205.130 master <none> <none>
default nginx-web-xfktj 1/1 Running 0 38s 172.17.40.65 master1 <none> <none>
kube-system calico-kube-controllers-798cc86c47-9kdgn 1/1 Running 0 3h34m 10.88.2.89 node1 <none> <none>
kube-system calico-node-7nx46 1/1 Running 0 146m 192.168.75.12 node2 <none> <none>
kube-system calico-node-fzk4f 1/1 Running 0 146m 192.168.75.14 master2 <none> <none>
kube-system calico-node-ld94g 1/1 Running 0 146m 192.168.75.13 master1 <none> <none>
kube-system calico-node-pkmrd 1/1 Running 0 146m 192.168.75.11 node1 <none> <none>
kube-system calico-node-rvq8x 1/1 Running 0 146m 192.168.75.10 master <none> <none>
kube-system coredns-564fd8c776-c8prw 1/1 Running 0 6m7s 172.27.205.129 master <none> <none>
[root@master k8s-work]#
[root@master k8s-work]# kubectl get service -A -o wide
NAMESPACE NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
default kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 29h <none>
default nginx-service-nodeport NodePort 10.97.169.35 <none> 80:30001/TCP 115s name=nginx
kube-system kube-dns ClusterIP 10.96.0.2 <none> 53/UDP,53/TCP,9153/TCP 7m24s k8s-app=kube-dns
[root@master k8s-work]#
