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二进制部署k8s高可用版本

二进制安装k8s 1.18版本

注意：本文档适用于k8s 1.17 1.18 1.19，请不要使用带中文的服务器和克隆的虚拟机
本文将演示CentOS 7二进制方式安装高可用k8s 1.18.x，相对于其他版本，二进制安装方式并无太大区别。

集群规划

IP地址	主机名	备注
10.0.0.100	k8s-master01	k8s节点集群
10.0.0.101	k8s-master02	k8s节点集群
10.0.0.102	k8s-master03	k8s节点集群
10.0.0.103	k8s-node01	k8s节点集群
10.0.0.104	k8s-node02	k8s节点集群
10.0.0.222	keepalived	高可用虚拟VIP

注意：

服务器或者虚拟机配置均不少于2核2G不然集群起不来，pod网段和service网段不和主机在同一网段。

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！

配置信息	备注
系统版本	CentOS 7.9
Docker版本	19.03.x
Pod网段	172.168.0.0/12
Service网段	10.96.0.0/12

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！

公有云上搭建VIP是公有云的负载均衡的IP，比如阿里云的内网SLB的地址，腾讯云内网ELB的地址.

1.环境准备

#1.系统
[root@k8s-master01 ~]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)

#2.所有节点配置hosts文件
[root@k8s-master01 ~]# cat /etc/hosts
10.0.0.100 k8s-master01
10.0.0.101 k8s-master02
10.0.0.102 k8s-master03
10.0.0.103 k8s-node01
10.0.0.104 k8s-node02
10.0.0.222 k8s-master-lb

#3.所有节点安装基本工具并关闭firewalld 、dnsmasq、selinux (CentOS7需要关闭NetworkManager，CentOS8不需要)

yum install wget jq psmisc vim net-tools yum-utils device-mapper-persistent-data lvm2 git  dnsmasq vim -y

systemctl disable --now firewalld
systemctl disable --now dnsmasq
systemctl disable --now NetworkManager    (如为centos8则不需要)
setenforce 0
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/sysconfig/selinux
sed -i 's#SELINUX=enforcing#SELINUX=disabled#g' /etc/selinux/config


#4.所有节点关闭swap分区，fstab注释swap
[root@k8s-master01 ~]# swapoff -a && sysctl -w vm.swappiness=0
vm.swappiness = 0
[root@k8s-master01 ~]# vi /etc/fstab
[root@k8s-master01 ~]# cat /etc/fstab
#
# /etc/fstab
# Created by anaconda on Fri Nov  1 23:02:53 2019
#
# Accessible filesystems, by reference, are maintained under '/dev/disk/'.
# See man pages fstab(5), findfs(8), mount(8) and/or blkid(8) for more info.
#
# After editing this file, run 'systemctl daemon-reload' to update systemd
# units generated from this file.
#
/dev/mapper/cl-root     /                       xfs     defaults        0 0
UUID=6897cd7b-9b3a-42b0-a827-57991141b297 /boot                   ext4    defaults        1 2
#/dev/mapper/cl-swap     swap                    swap    defaults        0 0

#5.安装ntpdate进行时间同步
rpm -ivh http://mirrors.wlnmp.com/centos/wlnmp-release-centos.noarch.rpm
yum install ntpdate -y

#6.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

# 加入到crontab
shell# vim /etc/crontab
*/5 * * * * /usr/sbin/ntpdate time2.aliyun.com

#7.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

Master01节点免密钥登录其他节点，安装过程中生成配置文件和证书均在Master01上操作，集群管理也在Master01上操作，阿里云或者AWS上需要单独一台kubectl服务器。密钥配置如下：

#分步执行
ssh-keygen -t rsa

for i in k8s-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02;do ssh-copy-id -i .ssh/id_rsa.pub $i;done

#Master01下载安装文件
cd /root/ ; git clone https://github.com/dotbalo/k8s-ha-install.git

#切换到1.18.x分支
cd k8s-ha-install && git checkout manual-installation-v1.18.x

#所有节点
CentOS 7安装yum源如下：
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
 
CentOS 8 安装源如下：
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-8.repo
yum makecache
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

基本组件安装

无论是CentOS7和CentOS8都需要升级--->所有节点

# yum update -y

内核升级-------如需内核升级，可以按需操作

# CentOS7必须升级内核
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

#所有节点安装内核
[root@k8s-master01 ~]# scp -rp kernel-ml-* root@10.0.0.101:/root
[root@k8s-master01 ~]# scp -rp kernel-ml-* root@10.0.0.102:/root
[root@k8s-master01 ~]# scp -rp kernel-ml-* root@10.0.0.103:/root
[root@k8s-master01 ~]# scp -rp kernel-ml-* root@10.0.0.104:/root   

cd /root && yum localinstall -y kernel-ml*
#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)"

#检查默认内核是不是4.19
[root@k8s-master02 ~]# grubby --default-kernel
/boot/vmlinuz-4.19.12-1.el7.elrepo.x86_64

所有节点安装ipvs

yum install ipvsadm ipset sysstat conntrack libseccomp -y
# 内核4.18以下nf_conntrack_ipv4，内核高于4.18 nf_conntrack

[root@k8s-master02 ~]# cat /etc/modules-load.d/ipvs.conf
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_ipv4
ip_tables
ip_set
xt_set
ipt_set
ipt_rpfilter
ipt_REJECT
ipip

[root@k8s-master02 ~]# systemctl enable --now systemd-modules-load.service
####### 警告忽略

[root@k8s-master01 ~]# lsmod | grep --color=auto -e ip_vs -e nf_conntrack
nf_conntrack_ipv4      15053  0
nf_defrag_ipv4         12729  1 nf_conntrack_ipv4
ip_vs_ftp              13079  0
nf_nat                 26787  1 ip_vs_ftp
ip_vs_sed              12519  0
ip_vs_nq               12516  0
ip_vs_sh               12688  0
ip_vs_dh               12688  0
ip_vs_lblcr            12922  0
ip_vs_lblc             12819  0
ip_vs_wrr              12697  0
ip_vs_rr               12600  0
ip_vs_wlc              12519  0
ip_vs_lc               12516  0
ip_vs                 145497  22 ip_vs_dh,ip_vs_lc,ip_vs_nq,ip_vs_rr,ip_vs_sh,ip_vs_ftp,ip_vs_sed,ip_vs_wlc,ip_vs_wrr,ip_vs_lblcr,ip_vs_lblc
nf_conntrack          133095  3 ip_vs,nf_nat,nf_conntrack_ipv4
libcrc32c              12644  4 xfs,ip_vs,nf_nat,nf_conntrack



# 所有节点配置内核参数
cat <<EOF > /etc/sysctl.d/k8s.conf
net.ipv4.ip_forward = 1
net.bridge.bridge-nf-call-iptables = 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

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

所有节点安装新版containerd

#1.配置源
wget -O /etc/yum.repos.d/docker-ce.repo https://mirrors.ustc.edu.cn/docker-ce/linux/centos/docker-ce.repo

sed -i 's#download.docker.com#mirrors.tuna.tsinghua.edu.cn/docker-ce#g' /etc/yum.repos.d/docker-ce.repo

[root@k8s-master01 ~]# wget https://download.docker.com/linux/centos/7/x86_64/stable/Packages/containerd.io-1.2.13-3.2.el7.x86_64.rpm
[root@k8s-master01 ~]# yum install containerd.io-1.2.13-3.2.el7.x86_64.rpm -y
[root@k8s-master01 ~]# yum install docker-ce -y

#温馨提示：
由于新版kubelet建议使用systemd，所以可以把docker的CgroupDriver改成systemd

mkdir -p /etc/docker
cat > /etc/docker/daemon.json <<EOF
{
  "exec-opts": ["native.cgroupdriver=systemd"]
}
EOF

所有节点开启Docker并设置开机自启动

[root@k8s-master01 ~]# systemctl start docker.service
[root@k8s-master01 ~]# systemctl enable docker.service
#查看docker版本信息
[root@k8s-master01 ~]# docker info

k8s组件安装（下载慢的话可以使用迅雷下载）

#1.Master01下载kubernetes安装包
[root@k8s-master01 ~]# wget https://storage.googleapis.com/kubernetes-release/release/v1.18.8/kubernetes-server-linux-amd64.tar.gz

#2.下载etcd安装包
[root@k8s-master01 ~]# wget https://github.com/etcd-io/etcd/releases/download/v3.4.12/etcd-v3.4.12-linux-amd64.tar.gz

#3.解压kubernetes、etcd安装文件
[root@k8s-master01 ~]# tar -xf kubernetes-server-linux-amd64.tar.gz  --strip-components=3 -C /usr/local/bin
[root@k8s-master01 ~]#  tar -zxvf etcd-v3.4.12-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.4.12-linux-amd64/etcd{,ctl}

#4.版本查看
[root@k8s-master01 ~]# kubectl version
Client Version: version.Info{Major:"1", Minor:"18", GitVersion:"v1.18.8",

[root@k8s-master01 ~]# etcdctl version
etcdctl version: 3.4.12
API version: 3.4

将组件推送到其它节点

#变量、
MasterNodes='k8s-master02 k8s-master03'
WorkNodes='k8s-node01 k8s-node02'

for NODE in $MasterNodes; do echo $NODE; scp /usr/local/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy} $NODE:/usr/local/bin/; scp /usr/local/bin/etcd* $NODE:/usr/local/bin/; done
for NODE in $WorkNodes; do scp /usr/local/bin/kube{let,-proxy} $NODE:/usr/local/bin/ ; done

所有节点创建/opt/cni/bin目录
mkdir -p /opt/cni/bin

生成证书

二进制安装最关键步骤，一步错误全盘皆输，一定要注意每个步骤都要是正确的

#1.下载生成证书工具
wget "https://pkg.cfssl.org/R1.2/cfssl_linux-amd64" -O /usr/local/bin/cfssl
wget "https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64" -O /usr/local/bin/cfssljson
chmod +x /usr/local/bin/cfssl /usr/local/bin/cfssljson

#2.所有Master节点创建etcd证书目录
mkdir /etc/etcd/ssl -p

#3.Master01节点生成etcd证书
[root@k8s-master01 ~]# cd /root/k8s-ha-install/pki
[root@k8s-master01 pki]# cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare /etc/etcd/ssl/etcd-ca
2021/02/04 09:55:21 [INFO] generating a new CA key and certificate from CSR
2021/02/04 09:55:21 [INFO] generate received request
2021/02/04 09:55:21 [INFO] received CSR
2021/02/04 09:55:21 [INFO] generating key: rsa-2048
2021/02/04 09:55:23 [INFO] encoded CSR
2021/02/04 09:55:23 [INFO] signed certificate with serial number 532089522914216378905293228797136502101244087432

#注意更换ip地址为自己的
[root@k8s-master01 pki]# cfssl gencert    -ca=/etc/etcd/ssl/etcd-ca.pem    -ca-key=/etc/etcd/ssl/etcd-ca-key.pem    -config=ca-config.json    -hostname=127.0.0.1,k8s-master01,k8s-master02,k8s-master03,10.0.0.100,10.0.0.101,10.0.0.102    -profile=kubernetes    etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd
2021/02/04 09:55:33 [INFO] generate received request
2021/02/04 09:55:33 [INFO] received CSR
2021/02/04 09:55:33 [INFO] generating key: rsa-2048
2021/02/04 09:55:34 [INFO] encoded CSR
2021/02/04 09:55:34 [INFO] signed certificate with serial number 376839864892428073884570446885125061123652661891

将证书复制到其他节点

[root@k8s-master01 pki]# MasterNodes='k8s-master02 k8s-master03'
[root@k8s-master01 pki]# WorkNodes='k8s-node01 k8s-node02'
[root@k8s-master01 pki]# for NODE in $MasterNodes; do
     ssh $NODE "mkdir -p /etc/etcd/ssl"
     for FILE in etcd-ca-key.pem  etcd-ca.pem  etcd-key.pem  etcd.pem; do
       scp /etc/etcd/ssl/${FILE} $NODE:/etc/etcd/ssl/${FILE}
     done
 done

生成kubernetes证书

# 所有节点创建kubernetes相关目录
mkdir -p /etc/kubernetes/pki

#以下只在k8s-master01执行，执行完毕后使用scp推送到对端主机
[root@k8s-master01 pki]# cfssl gencert -initca ca-csr.json | cfssljson -bare /etc/kubernetes/pki/ca

[root@k8s-master01 pki]# cfssl gencert -ca=/etc/kubernetes/pki/ca.pem -ca-key=/etc/kubernetes/pki/ca-key.pem   -config=ca-config.json   -hostname=10.96.0.1,10.0.0.222,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,10.0.0.100,10.0.0.101,10.0.0.102   -profile=kubernetes   apiserver-csr.json | cfssljson -bare /etc/kubernetes/pki/apiserver

[root@k8s-master01 pki]# cfssl gencert   -initca front-proxy-ca-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-ca

[root@k8s-master01 pki]# cfssl gencert   -ca=/etc/kubernetes/pki/front-proxy-ca.pem   -ca-key=/etc/kubernetes/pki/front-proxy-ca-key.pem   -config=ca-config.json   -profile=kubernetes   front-proxy-client-csr.json | cfssljson -bare /etc/kubernetes/pki/front-proxy-client

[root@k8s-master01 pki]# cfssl gencert \
   -ca=/etc/kubernetes/pki/ca.pem \
   -ca-key=/etc/kubernetes/pki/ca-key.pem \
   -config=ca-config.json \
   -profile=kubernetes \
   manager-csr.json | cfssljson -bare /etc/kubernetes/pki/controller-manager

[root@k8s-master01 pki]# kubectl config set-cluster kubernetes \
     --certificate-authority=/etc/kubernetes/pki/ca.pem \
     --embed-certs=true \
     --server=https://10.0.0.222:8443 \
     --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig


kubectl config set-context system:kube-controller-manager@kubernetes \
    --cluster=kubernetes \
    --user=system:kube-controller-manager \
    --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

kubectl config use-context system:kube-controller-manager@kubernetes \
    --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-credentials system:kube-controller-manager \
     --client-certificate=/etc/kubernetes/pki/controller-manager.pem \
     --client-key=/etc/kubernetes/pki/controller-manager-key.pem \
     --embed-certs=true \
     --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig

User "system:kube-controller-manager" set.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-context system:kube-controller-manager@kubernetes \
     --cluster=kubernetes \
     --user=system:kube-controller-manager \
     --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig


Context "system:kube-controller-manager@kubernetes" created.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config use-context system:kube-controller-manager@kubernetes \
     --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig


Switched to context "system:kube-controller-manager@kubernetes".

[root@k8s-master01 pki]# cfssl gencert \
   -ca=/etc/kubernetes/pki/ca.pem \
   -ca-key=/etc/kubernetes/pki/ca-key.pem \
   -config=ca-config.json \
   -profile=kubernetes \
   scheduler-csr.json | cfssljson -bare /etc/kubernetes/pki/scheduler

[root@k8s-master01 pki]# kubectl config set-cluster kubernetes \
     --certificate-authority=/etc/kubernetes/pki/ca.pem \
     --embed-certs=true \
     --server=https://10.0.0.222:8443 \
     --kubeconfig=/etc/kubernetes/scheduler.kubeconfig


Cluster "kubernetes" set.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-credentials system:kube-scheduler \
     --client-certificate=/etc/kubernetes/pki/scheduler.pem \
     --client-key=/etc/kubernetes/pki/scheduler-key.pem \
     --embed-certs=true \
     --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

User "system:kube-scheduler" set.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-context system:kube-scheduler@kubernetes \
     --cluster=kubernetes \
     --user=system:kube-scheduler \
     --kubeconfig=/etc/kubernetes/scheduler.kubeconfig


Context "system:kube-scheduler@kubernetes" created.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config use-context system:kube-scheduler@kubernetes \
     --kubeconfig=/etc/kubernetes/scheduler.kubeconfig


Switched to context "system:kube-scheduler@kubernetes".

[root@k8s-master01 pki]# cfssl gencert \
   -ca=/etc/kubernetes/pki/ca.pem \
   -ca-key=/etc/kubernetes/pki/ca-key.pem \
   -config=ca-config.json \
   -profile=kubernetes \
   admin-csr.json | cfssljson -bare /etc/kubernetes/pki/admin


[root@k8s-master01 pki]# kubectl config set-cluster kubernetes     --certificate-authority=/etc/kubernetes/pki/ca.pem     --embed-certs=true     --server=https://10.0.0.222:8443     --kubeconfig=/etc/kubernetes/admin.kubeconfig

Cluster "kubernetes" set.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-credentials kubernetes-admin     --client-certificate=/etc/kubernetes/pki/admin.pem     --client-key=/etc/kubernetes/pki/admin-key.pem     --embed-certs=true     --kubeconfig=/etc/kubernetes/admin.kubeconfig

User "kubernetes-admin" set.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config set-context kubernetes-admin@kubernetes     --cluster=kubernetes     --user=kubernetes-admin     --kubeconfig=/etc/kubernetes/admin.kubeconfig

Context "kubernetes-admin@kubernetes" created.
[root@k8s-master01 pki]#
[root@k8s-master01 pki]# kubectl config use-context kubernetes-admin@kubernetes     --kubeconfig=/etc/kubernetes/admin.kubeconfig

Switched to context "kubernetes-admin@kubernetes".

创建ServiceAccount Key

[root@k8s-master01 pki]# openssl genrsa -out /etc/kubernetes/pki/sa.key 2048
[root@k8s-master01 pki]# openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub

[root@k8s-master01 pki]# for NODE in k8s-master02 k8s-master03; do
for FILE in $(ls /etc/kubernetes/pki | grep -v etcd); do
scp /etc/kubernetes/pki/${FILE} $NODE:/etc/kubernetes/pki/${FILE};
done;
for FILE in admin.kubeconfig controller-manager.kubeconfig scheduler.kubeconfig; do

Kubernetes系统组件配置

etcd配置大致相同，注意修改每个Master节点的etcd配置的主机名和IP地址，服务器多的话也可以将etcd分开配置

1、master01 etcd配置文件

[root@k8s-master01 ~]# vim /etc/etcd/etcd.config.yml
[root@k8s-master01 ~]# cat /etc/etcd/etcd.config.yml
name: 'k8s-master01'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://10.0.0.100:2380'
listen-client-urls: 'https://10.0.0.100:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://10.0.0.100:2380'
advertise-client-urls: 'https://10.0.0.100:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://10.0.0.100:2380,k8s-master02=https://10.0.0.101:2380,k8s-master03=https://10.0.0.102:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false

2、master02 etcd配置文件

[root@k8s-master02 ~]# vim /etc/etcd/etcd.config.yml
[root@k8s-master02 ~]# cat /etc/etcd/etcd.config.yml
name: 'k8s-master02'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://10.0.0.101:2380'
listen-client-urls: 'https://10.0.0.101:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://10.0.0.101:2380'
advertise-client-urls: 'https://10.0.0.101:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://10.0.0.100:2380,k8s-master02=https://10.0.0.101:2380,k8s-master03=https://10.0.0.102:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false

3、master03 etcd配置文件

[root@k8s-master03 ~]# vim /etc/etcd/etcd.config.yml
[root@k8s-master03 ~]# cat /etc/etcd/etcd.config.yml
name: 'k8s-master03'
data-dir: /var/lib/etcd
wal-dir: /var/lib/etcd/wal
snapshot-count: 5000
heartbeat-interval: 100
election-timeout: 1000
quota-backend-bytes: 0
listen-peer-urls: 'https://10.0.0.102:2380'
listen-client-urls: 'https://10.0.0.102:2379,http://127.0.0.1:2379'
max-snapshots: 3
max-wals: 5
cors:
initial-advertise-peer-urls: 'https://10.0.0.102:2380'
advertise-client-urls: 'https://10.0.0.102:2379'
discovery:
discovery-fallback: 'proxy'
discovery-proxy:
discovery-srv:
initial-cluster: 'k8s-master01=https://10.0.0.100:2380,k8s-master02=https://10.0.0.101:2380,k8s-master03=https://10.0.0.102:2380'
initial-cluster-token: 'etcd-k8s-cluster'
initial-cluster-state: 'new'
strict-reconfig-check: false
enable-v2: true
enable-pprof: true
proxy: 'off'
proxy-failure-wait: 5000
proxy-refresh-interval: 30000
proxy-dial-timeout: 1000
proxy-write-timeout: 5000
proxy-read-timeout: 0
client-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
peer-transport-security:
  cert-file: '/etc/kubernetes/pki/etcd/etcd.pem'
  key-file: '/etc/kubernetes/pki/etcd/etcd-key.pem'
  peer-client-cert-auth: true
  trusted-ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem'
  auto-tls: true
debug: false
log-package-levels:
log-outputs: [default]
force-new-cluster: false

所有Master节点创建etcd service并启动

#以下操作在master01、master02、master03均执行
[root@k8s-master01 ~]# vim /usr/lib/systemd/system/etcd.service
[root@k8s-master01 ~]# cat /usr/lib/systemd/system/etcd.service
[Unit]
Description=Etcd Service
Documentation=https://coreos.com/etcd/docs/latest/
After=network.target

[Service]
Type=notify
ExecStart=/usr/local/bin/etcd --config-file=/etc/etcd/etcd.config.yml
Restart=on-failure
RestartSec=10
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
Alias=etcd3.service

[root@k8s-master01 ~]# mkdir /etc/kubernetes/pki/etcd
[root@k8s-master01 ~]# ln -s /etc/etcd/ssl/* /etc/kubernetes/pki/etcd/
[root@k8s-master01 ~]# systemctl daemon-reload
[root@k8s-master01 ~]# systemctl enable --now etcd
Created symlink from /etc/systemd/system/etcd3.service to /usr/lib/systemd/system/etcd.service.
Created symlink from /etc/systemd/system/multi-user.target.wants/etcd.service to /usr/lib/systemd/system/etcd.service.

Etcd changelog：

https://github.com/etcd-io/etcd/blob/master/Documentation/upgrades/upgrade_3_4.md

高可用配置

所有Master节点安装keepalived和haproxy

yum install keepalived haproxy -y

# 所有Master配置HAProxy，配置一样
[root@k8s-master01 ~]# vim /etc/haproxy/haproxy.cfg
[root@k8s-master01 ~]# cat /etc/haproxy/haproxy.cfg
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 k8s-master01    10.0.0.100:6443  check
  server k8s-master02    10.0.0.101:6443  check
  server k8s-master03    10.0.0.102:6443  check

所有Master节点配置KeepAlived，配置不一样，注意区分

[root@k8s-master01 pki]# vim /etc/keepalived/keepalived.conf ，注意每个节点的IP和网卡（interface参数）

#master01配置
[root@k8s-master01 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
}
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 10.0.0.100
    virtual_router_id 51
    priority 101
    nopreempt
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        10.0.0.222
    }
    track_script {
      chk_apiserver
} }

#master02配置
[root@k8s-master02 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
}
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 10.0.0.101
    virtual_router_id 51
    priority 100
    nopreempt
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        10.0.0.222
    }
    track_script {
      chk_apiserver
} }

#master03配置
[root@k8s-master03 ~]# vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
}
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 10.0.0.102
    virtual_router_id 51
    priority 100
    nopreempt
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        10.0.0.222
    }
    track_script {
      chk_apiserver
} }

健康检查配置

[root@k8s-master01 keepalived]# vim /etc/keepalived/check_apiserver.sh
#!/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

[root@k8s-master01 keepalived]# chmod +x /etc/keepalived/check_apiserver.sh

启动haproxy和keepalived

[root@k8s-master01 keepalived]# systemctl daemon-reload
[root@k8s-master01 keepalived]# systemctl enable --now haproxy
[root@k8s-master01 keepalived]# systemctl enable --now keepalived

vip测试

[root@k8s-master01 ~]# ping 10.0.0.222
PING 10.0.0.222 (10.0.0.222) 56(84) bytes of data.
64 bytes from 10.0.0.222: icmp_seq=1 ttl=64 time=0.105 ms
64 bytes from 10.0.0.222: icmp_seq=2 ttl=64 time=0.045 ms
^C
--- 10.0.0.222 ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 999ms
rtt min/avg/max/mdev = 0.045/0.075/0.105/0.030 ms

[root@k8s-master02 ~]# telnet 10.0.0.222 8443
Trying 10.0.0.222...
Connected to 10.0.0.222.
Escape character is '^]'.
Connection closed by foreign host.

重要：如果安装了keepalived和haproxy，需要测试keepalived是否是正常的

telnet 10.0.0.222 8443

如果ping不通且telnet没有出现 ]，则认为VIP不可以，不可在继续往下执行，需要排查keepalived的问题，比如防火墙和selinux，haproxy和keepalived的状态，监听端口等

所有节点查看防火墙状态必须为disable和inactive：systemctl status firewalld

所有节点查看selinux状态，必须为disable：getenforce

master节点查看haproxy和keepalived状态：systemctl status keepalived haproxy

master节点查看监听端口：netstat -lntp

Kubernetes组件配置

所有节点创建相关目录

[root@k8s-master01 pki]# mkdir -p /etc/kubernetes/manifests/ /etc/systemd/system/kubelet.service.d /var/lib/kubelet /var/log/kubernetes

所有Master节点创建kube-apiserver service

[root@k8s-master01 pki]# cat /usr/lib/systemd/system/kube-apiserver.service
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-apiserver \
      --v=2  \
      --logtostderr=true  \
      --allow-privileged=true  \
      --bind-address=0.0.0.0  \
      --secure-port=6443  \
      --insecure-port=0  \
      --advertise-address=10.0.0.222 \
      --service-cluster-ip-range=10.96.0.0/12  \
      --service-node-port-range=30000-32767  \
      --etcd-servers=https://10.0.0.100:2379,https://10.0.0.101:2379,https://10.0.0.102:2379 \
      --etcd-cafile=/etc/etcd/ssl/etcd-ca.pem  \
      --etcd-certfile=/etc/etcd/ssl/etcd.pem  \
      --etcd-keyfile=/etc/etcd/ssl/etcd-key.pem  \
      --client-ca-file=/etc/kubernetes/pki/ca.pem  \
      --tls-cert-file=/etc/kubernetes/pki/apiserver.pem  \
      --tls-private-key-file=/etc/kubernetes/pki/apiserver-key.pem  \
      --kubelet-client-certificate=/etc/kubernetes/pki/apiserver.pem  \
      --kubelet-client-key=/etc/kubernetes/pki/apiserver-key.pem  \
      --service-account-key-file=/etc/kubernetes/pki/sa.pub  \
      --kubelet-preferred-address-types=InternalIP,ExternalIP,Hostname  \
      --enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,DefaultStorageClass,DefaultTolerationSeconds,NodeRestriction,ResourceQuota  \
      --authorization-mode=Node,RBAC  \
      --enable-bootstrap-token-auth=true  \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem  \
      --proxy-client-cert-file=/etc/kubernetes/pki/front-proxy-client.pem  \
      --proxy-client-key-file=/etc/kubernetes/pki/front-proxy-client-key.pem  \
      --requestheader-allowed-names=aggregator  \
      --requestheader-group-headers=X-Remote-Group  \
      --requestheader-extra-headers-prefix=X-Remote-Extra-  \
      --requestheader-username-headers=X-Remote-User
      # --token-auth-file=/etc/kubernetes/token.csv

Restart=on-failure
RestartSec=10s
LimitNOFILE=65535

[Install]
WantedBy=multi-user.target

所有Master节点开启kube-apiserver

[root@k8s-master01 pki]# systemctl daemon-reload && systemctl enable --now kube-apiserver

#检测状态是否正常
[root@k8s-master01 pki]# systemctl status kube-apiserver
● kube-apiserver.service - Kubernetes API Server
   Loaded: loaded (/usr/lib/systemd/system/kube-apiserver.service; enabled; vendor preset: disabled)
   Active: active (running) since Thu 2021-02-04 11:42:05 CST; 812ms ago

所有Master节点配置kube-controller-manager service

[root@k8s-master01 pki]# cat /usr/lib/systemd/system/kube-controller-manager.service
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-controller-manager \
      --v=2 \
      --logtostderr=true \
      --address=127.0.0.1 \
      --root-ca-file=/etc/kubernetes/pki/ca.pem \
      --cluster-signing-cert-file=/etc/kubernetes/pki/ca.pem \
      --cluster-signing-key-file=/etc/kubernetes/pki/ca-key.pem \
      --service-account-private-key-file=/etc/kubernetes/pki/sa.key \
      --kubeconfig=/etc/kubernetes/controller-manager.kubeconfig \
      --leader-elect=true \
      --use-service-account-credentials=true \
      --node-monitor-grace-period=40s \
      --node-monitor-period=5s \
      --pod-eviction-timeout=2m0s \
      --controllers=*,bootstrapsigner,tokencleaner \
      --allocate-node-cidrs=true \
      --cluster-cidr=10.244.0.0/16 \
      --requestheader-client-ca-file=/etc/kubernetes/pki/front-proxy-ca.pem \
      --node-cidr-mask-size=24
     
Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target

所有Master节点启动kube-controller-manager

[root@k8s-master01 pki]# systemctl daemon-reload
[root@k8s-master01 pki]# systemctl enable --now kube-controller-manager
Created symlink /etc/systemd/system/multi-user.target.wants/kube-controller-manager.service → /usr/lib/systemd/system/kube-controller-manager.service.

所有Master节点配置kube-scheduler service

[root@k8s-master01 pki]# cat /usr/lib/systemd/system/kube-scheduler.service
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
ExecStart=/usr/local/bin/kube-scheduler \
      --v=2 \
      --logtostderr=true \
      --address=127.0.0.1 \
      --leader-elect=true \
      --kubeconfig=/etc/kubernetes/scheduler.kubeconfig

Restart=always
RestartSec=10s

[Install]
WantedBy=multi-user.target

[root@k8s-master01 pki]# systemctl daemon-reload
[root@k8s-master01 pki]# systemctl enable --now kube-scheduler
Created symlink /etc/systemd/system/multi-user.target.wants/kube-scheduler.service → /usr/lib/systemd/system/kube-scheduler.service.

TLS Bootstrapping配置

在Master01创建bootstrap

cd /root/k8s-ha-install/bootstrap
kubectl config set-cluster kubernetes     --certificate-authority=/etc/kubernetes/pki/ca.pem     --embed-certs=true     --server=https://10.0.0.222:8443     --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
kubectl config set-credentials tls-bootstrap-token-user     --token=c8ad9c.2e4d610cf3e7426e --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
kubectl config set-context tls-bootstrap-token-user@kubernetes     --cluster=kubernetes     --user=tls-bootstrap-token-user     --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig
kubectl config use-context tls-bootstrap-token-user@kubernetes     --kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig

注意：如果要修改bootstrap.secret.yaml的token-id和token-secret，需要保证下图红圈内的字符串一致的，并且位数是一样的。还要保证上个命令的黄色字体：c8ad9c.2e4d610cf3e7426e与你修改的字符串要一致

[root@k8s-master01 bootstrap]# cp /etc/kubernetes/admin.kubeconfig /root/.kube/config
[root@k8s-master01 bootstrap]# kubectl create -f bootstrap.secret.yaml
secret/bootstrap-token-c8ad9c created
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-bootstrap created
clusterrolebinding.rbac.authorization.k8s.io/node-autoapprove-certificate-rotation created
clusterrole.rbac.authorization.k8s.io/system:kube-apiserver-to-kubelet created
clusterrolebinding.rbac.authorization.k8s.io/system:kube-apiserver created

Node节点配置

复制证书至Node节点

[root@k8s-master01 bootstrap]# for NODE in k8s-master02 k8s-master03 k8s-node01 k8s-node02; do
     ssh $NODE mkdir -p /etc/kubernetes/pki /etc/etcd/ssl /etc/etcd/ssl
     for FILE in etcd-ca.pem etcd.pem etcd-key.pem; do
       scp /etc/etcd/ssl/$FILE $NODE:/etc/etcd/ssl/
     done
     for FILE in pki/ca.pem pki/ca-key.pem pki/front-proxy-ca.pem bootstrap-kubelet.kubeconfig; do
       scp /etc/kubernetes/$FILE $NODE:/etc/kubernetes/${FILE}
 done
 done

mkdir -p /var/lib/kubelet /var/log/kubernetes /etc/systemd/system/kubelet.service.d /etc/kubernetes/manifests/

所有节点配置kubelet service（Master节点不部署Pod也可无需配置）

[root@k8s-master01 bootstrap]# vim  /usr/lib/systemd/system/kubelet.service

[Unit]
Description=Kubernetes Kubelet
Documentation=https://github.com/kubernetes/kubernetes
After=docker.service
Requires=docker.service

[Service]
ExecStart=/usr/local/bin/kubelet

Restart=always
StartLimitInterval=0
RestartSec=10

[Install]
WantedBy=multi-user.target
 
 
 
[root@k8s-master01 bootstrap]# vim /etc/systemd/system/kubelet.service.d/10-kubelet.conf

[Service]
Environment="KUBELET_KUBECONFIG_ARGS=--bootstrap-kubeconfig=/etc/kubernetes/bootstrap-kubelet.kubeconfig --kubeconfig=/etc/kubernetes/kubelet.kubeconfig"
Environment="KUBELET_SYSTEM_ARGS=--network-plugin=cni --cni-conf-dir=/etc/cni/net.d --cni-bin-dir=/opt/cni/bin"
Environment="KUBELET_CONFIG_ARGS=--config=/etc/kubernetes/kubelet-conf.yml"
Environment="KUBELET_EXTRA_ARGS=--node-labels=node.kubernetes.io/node='' --pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/google_containers/pause-amd64:3.1"
ExecStart=
ExecStart=/usr/local/bin/kubelet $KUBELET_KUBECONFIG_ARGS $KUBELET_CONFIG_ARGS $KUBELET_SYSTEM_ARGS $KUBELET_EXTRA_ARGS
 
 
 
[root@k8s-master01 bootstrap]# vim /etc/kubernetes/kubelet-conf.yml

apiVersion: kubelet.config.k8s.io/v1beta1
kind: KubeletConfiguration
address: 0.0.0.0
port: 10250
readOnlyPort: 10255
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 2m0s
    enabled: true
  x509:
    clientCAFile: /etc/kubernetes/pki/ca.pem
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 5m0s
    cacheUnauthorizedTTL: 30s
cgroupDriver: systemd
cgroupsPerQOS: true
clusterDNS:
- 10.96.0.10
clusterDomain: cluster.local
containerLogMaxFiles: 5
containerLogMaxSize: 10Mi
contentType: application/vnd.kubernetes.protobuf
cpuCFSQuota: true
cpuManagerPolicy: none
cpuManagerReconcilePeriod: 10s
enableControllerAttachDetach: true
enableDebuggingHandlers: true
enforceNodeAllocatable:
- pods
eventBurst: 10
eventRecordQPS: 5
evictionHard:
  imagefs.available: 15%
  memory.available: 100Mi
  nodefs.available: 10%
  nodefs.inodesFree: 5%
evictionPressureTransitionPeriod: 5m0s
failSwapOn: true
fileCheckFrequency: 20s
hairpinMode: promiscuous-bridge
healthzBindAddress: 127.0.0.1
healthzPort: 10248
httpCheckFrequency: 20s
imageGCHighThresholdPercent: 85
imageGCLowThresholdPercent: 80
imageMinimumGCAge: 2m0s
iptablesDropBit: 15
iptablesMasqueradeBit: 14
kubeAPIBurst: 10
kubeAPIQPS: 5
makeIPTablesUtilChains: true
maxOpenFiles: 1000000
maxPods: 110
nodeStatusUpdateFrequency: 10s
oomScoreAdj: -999
podPidsLimit: -1
registryBurst: 10
registryPullQPS: 5
resolvConf: /etc/resolv.conf
rotateCertificates: true
runtimeRequestTimeout: 2m0s
serializeImagePulls: true
staticPodPath: /etc/kubernetes/manifests
streamingConnectionIdleTimeout: 4h0m0s
syncFrequency: 1m0s
volumeStatsAggPeriod: 1m0s

启动所有节点kubelet

systemctl daemon-reload
systemctl enable --now kubelet

此时系统日志cat /var/log/messages
Unable to update cni config: no networks found in /etc/cni/net.d 显示只有如下信息为正常

查看集群状态

[root@k8s-master01 bootstrap]# kubectl get node
NAME           STATUS     ROLES    AGE    VERSION
k8s-master01   NotReady   <none>   101s   v1.18.8
k8s-master02   NotReady   <none>   96s    v1.18.8
k8s-master03   NotReady   <none>   95s    v1.18.8
k8s-node01     NotReady   <none>   83s    v1.18.8
k8s-node2      NotReady   <none>   77s    v1.18.8

Kube-Proxy配置

cd /root/k8s-ha-install
kubectl -n kube-system create serviceaccount kube-proxy
kubectl create clusterrolebinding system:kube-proxy         --clusterrole system:node-proxier         --serviceaccount kube-system:kube-proxy
SECRET=$(kubectl -n kube-system get sa/kube-proxy \
    --output=jsonpath='{.secrets[0].name}')
JWT_TOKEN=$(kubectl -n kube-system get secret/$SECRET \
--output=jsonpath='{.data.token}' | base64 -d)
PKI_DIR=/etc/kubernetes/pki
K8S_DIR=/etc/kubernetes
kubectl config set-cluster kubernetes     --certificate-authority=/etc/kubernetes/pki/ca.pem     --embed-certs=true     --server=https://10.0.0.222:8443     --kubeconfig=${K8S_DIR}/kube-proxy.kubeconfig
kubectl config set-credentials kubernetes     --token=${JWT_TOKEN}     --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config set-context kubernetes     --cluster=kubernetes     --user=kubernetes     --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig
kubectl config use-context kubernetes     --kubeconfig=/etc/kubernetes/kube-proxy.kubeconfig

赋值Service文件

[root@k8s-master01 k8s-ha-install]# for NODE in k8s-master01 k8s-master02 k8s-master03; do
     scp ${K8S_DIR}/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig
     scp kube-proxy/kube-proxy.conf $NODE:/etc/kubernetes/kube-proxy.conf
     scp kube-proxy/kube-proxy.service $NODE:/usr/lib/systemd/system/kube-proxy.service
 done

 
[root@k8s-master01 k8s-ha-install]#
[root@k8s-master01 k8s-ha-install]# for NODE in k8s-node01 k8s-node02; do
     scp /etc/kubernetes/kube-proxy.kubeconfig $NODE:/etc/kubernetes/kube-proxy.kubeconfig
     scp kube-proxy/kube-proxy.conf $NODE:/etc/kubernetes/kube-proxy.conf
     scp kube-proxy/kube-proxy.service $NODE:/usr/lib/systemd/system/kube-proxy.service
 done

所有节点启动kube-proxy

[root@k8s-master01 k8s-ha-install]# systemctl daemon-reload
[root@k8s-master01 k8s-ha-install]# systemctl enable --now kube-proxy
Created symlink /etc/systemd/system/multi-user.target.wants/kube-proxy.service → /usr/lib/systemd/system/kube-proxy.service.

安装calico(只在master01执行)

注意：如果国内用户下载Calico较慢，所有节点可以配置加速器(如果该文件有其他配置，别忘了加上去)

vim  /etc/docker/daemon.json
{
"exec-opts": ["native.cgroupdriver=systemd"],
  "registry-mirrors": [
    "https://registry.docker-cn.com",
    "http://hub-mirror.c.163.com",
    "https://docker.mirrors.ustc.edu.cn"
  ]
}

systemctl daemon-reload
systemctl restart docker

#安装最新版calico(master01)
[root@k8s-master01 k8s-ha-install]# kubectl create -f Calico/calico.yaml

#等待一段时间
#镜像下载速度可能会慢，使用kubectl get 查看po状态，系统Pod都在kube-system命名空间下
[root@k8s-master01 k8s-ha-install]# kubectl get pod -n kube-system -owide

如果容器状态异常可以使用kubectl describe 或者logs查看容器的日志

安装CoreDNS

安装CoreDNS

[root@k8s-master01 k8s-ha-install]# cd CoreDNS/
[root@k8s-master01 CoreDNS]# kubectl create -f coredns.yaml

#查看
[root@k8s-master01 CoreDNS]# kubectl get po -n kube-system -l k8s-app=kube-dns
NAME                       READY   STATUS    RESTARTS   AGE
coredns-5bf47f866c-qfghb   1/1     Running   0          2m11s

安装Metrics Server

[root@k8s-master01 k8s-ha-install]# kubectl create -f metrics-server-3.6.1/
查看状态
[root@k8s-master01 k8s-ha-install]# kubectl get po -n kube-system -l k8s-app=metrics-server
NAME                              READY   STATUS    RESTARTS   AGE
metrics-server-6986c8fc67-n9krv   1/1     Running   0          90s

集群验证

#安装busybox
cat<<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: busybox
  namespace: default
spec:
  containers:
  - name: busybox
    image: busybox:1.28
    command:
      - sleep
      - "3600"
    imagePullPolicy: IfNotPresent
  restartPolicy: Always
EOF

[root@k8s-master01 k8s-ha-install]# kubectl exec  busybox -n default -- nslookup kubernetes
Server:    10.96.0.10
Address 1: 10.96.0.10 kube-dns.kube-system.svc.cluster.local

Name:      kubernetes
Address 1: 10.96.0.1 kubernetes.default.svc.cluster.local

安装dashboard

[root@k8s-master01 k8s-ha-install]# kubectl create -f dashboard/

在谷歌浏览器（Chrome）启动文件中加入启动参数，用于解决无法访问Dashboard的问题，参考下图：

--test-type --ignore-certificate-errors

更改dashboard的svc为NodePort：
kubectl edit svc kubernetes-dashboard -n kubernetes-dashboard

将ClusterIP更改为NodePort（如果已经为NodePort忽略此步骤）：

[root@k8s-master01 k8s-ha-install]# kubectl get svc kubernetes-dashboard -n kubernetes-dashboard
NAME                   TYPE       CLUSTER-IP     EXTERNAL-IP   PORT(S)         AGE
kubernetes-dashboard   NodePort   10.108.74.25   <none>        443:32127/TCP   3m15s

根据自己的实例端口号，通过任意安装了kube-proxy的宿主机或者VIP的IP+端口即可访问到dashboard：

访问Dashboard：https://10.0.0.222:32127，选择登录方式为令牌（即token方式），参考图1-2

#创建管理员用户
[root@k8s-master01 k8s-ha-install]# cd dashboard/
[root@k8s-master01 dashboard]# vim admin.yaml
[root@k8s-master01 dashboard]# cat admin.yaml
apiVersion: v1
kind: ServiceAccount
metadata:
  name: admin-user
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: admin-user
  annotations:
    rbac.authorization.kubernetes.io/autoupdate: "true"
roleRef:
  apiGroup: rbac.authorization.k8s.io
  kind: ClusterRole
  name: cluster-admin
subjects:
- kind: ServiceAccount
  name: admin-user
  namespace: kube-system

[root@k8s-master01 dashboard]# kubectl create -f admin.yaml -n kube-system

查看token值

[root@k8s-master01 dashboard]# kubectl -n kube-system describe secret $(kubectl -n kube-system get secret | grep admin-user | awk '{print $1}')
Name:         admin-user-token-plbpc
Namespace:    kube-system
Labels:       <none>
Annotations:  kubernetes.io/service-account.name: admin-user
              kubernetes.io/service-account.uid: ba8ce4ac-2164-4374-83e9-a994417f2ea0

Type:  kubernetes.io/service-account-token

Data
====
ca.crt:     1359 bytes
namespace:  11 bytes
token:      eyJhbGciOiJSUzI1NiIsImtpZCI6ImZsY0dRRVpLYU14SUpPWEg2ME1pZmFnMEliVVNhRUQ1U0FSS1BaR0lqc0UifQ.eyJpc3MiOiJrdWJlcm5ldGVzL3NlcnZpY2VhY2NvdW50Iiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9uYW1lc3BhY2UiOiJrdWJlLXN5c3RlbSIsImt1YmVybmV0ZXMuaW8vc2VydmljZWFjY291bnQvc2VjcmV0Lm5hbWUiOiJhZG1pbi11c2VyLXRva2VuLXBsYnBjIiwia3ViZXJuZXRlcy5pby9zZXJ2aWNlYWNjb3VudC9zZXJ2aWNlLWFjY291bnQubmFtZSI6ImFkbWluLXVzZXIiLCJrdWJlcm5ldGVzLmlvL3NlcnZpY2VhY2NvdW50L3NlcnZpY2UtYWNjb3VudC51aWQiOiJiYThjZTRhYy0yMTY0LTQzNzQtODNlOS1hOTk0NDE3ZjJlYTAiLCJzdWIiOiJzeXN0ZW06c2VydmljZWFjY291bnQ6a3ViZS1zeXN0ZW06YWRtaW4tdXNlciJ9.F4iFj_w5fzLLecFxlmmXdqR_3Xohtn6RwvJlGOR1nY0VG9IjbzR2uMmPh1uizcuA6ToG-ASjJUTU6vlizE9YBTd-GgO2Xtx9Z2dfapyuRTn2edpicnPQ5r8JcX7QqJUCiGRww6PfVUL0x_mT0hxfhDt3VPXvJm_gCny3ZtCRIGU58EOK-RcY8bUMdJ1mkAhZJwgGKrMH16mPe3PvI5XuKsCAs4_ku9SLdmG-Nuyyh_Tk1hzgjS7qaqgkTAJPKUGrPurKnlYNEpYOTC2Q8slUeAv1Gl8oWT9qkh_Nb9rh4SmPkPr8NR0VjhOWgC0QuQIUyPwIwVFT4N_YWOxXqeCKHw

老王：自动化专业运维人员，k8s高级运维工程师，专注解决运维疑难杂症。。。分享使我快乐。。。

posted @ 2021-09-03 18:04 老王教你学Linux 阅读(662) 评论(0) 编辑收藏举报

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