k8s-集群部署-证书颁发-二进制部署-注册服务等

kubernetes
二进制部署
集群证书
部署ETCD集群
部署ETCD
- 注册ETCD服务
- 测试ETCD服务
部署master节点
编写配置文件以及下载安装包
- 下载安装包
- 创建集群配置文件
部署各个组件
- 安装kube-apiserver
部署TLS
部署contorller-manager
部署kube-scheduler
注册kubelet的服务
- 启动
部署kube-proxy
- 创建配置文件
注册服务
- 启动
加入集群节点
- 查看集群节点加入请求
- 批准加入
安装网络插件
安装集群DNS
- 验证集群
部署Node节点
安装集群图形化界面

kubernetes

k8s和docker之间的关系？

k8s是一个容器化管理平台，docker是一个容器，

二进制部署

集群角色

master节点：管理集群

node节点：主要用来部署应用

Master节点部署插件

kube-apiserver ：中央管理器，调度管理集群

kube-controller-manager ：控制器：管理容器，监控容器

kube-scheduler：调度器：调度容器

flannel : 提供集群间网络

etcd：数据库

kubelet

kube-proxy

Node节点部署插件

kubelet ：部署容器，监控容器

kube-proxy : 提供容器间的网络

节点规划

192.168.15.51 172.16.1.51 k8s-m-01 m1 
192.168.15.52 172.16.1.52 k8s-m-02 m2
192.168.15.53 172.16.1.53 k8s-m-03 m3
192.168.15.54 172.16.1.54 k8s-n-01 n1 
192.168.15.55 172.16.1.55 k8s-n-02 n2

# 虚拟VIP
192.168.15.56 172.16.1.56 k8s-m-vip vip

插件规划

# Master节点规划
kube-apiserver
kube-controller-manager
kube-scheduler
flannel
etcd
kubelet
kube-proxy

# Node节点规划
kubelet
kube-proxy

系统优化

# 关闭selinux

# 关闭防火墙
systemctl disable --now firewalld

# 关闭swap分区
swapoff -a
修改/etc/fstab
echo 'KUBELET_EXTRA_ARGS="--fail-swap-on=false"' > /etc/sysconfig/kubelet   # kubelet忽略swap

# 做免密登录
[root@k8s-m-01 ~]# ssh-keygen -t rsa
[root@k8s-m-01 ~]# for i in m1 n1 n2;do  ssh-copy-id -i ~/.ssh/id_rsa.pub root@$i; done

# 同步集群时间


# 配置镜像源
[root@k8s-m-01 ~]# curl  -o /etc/yum.repos.d/CentOS-Base.repo https://repo.huaweicloud.com/repository/conf/CentOS-7-reg.repo
[root@k8s-m-01 ~]# yum clean all
[root@k8s-m-01 ~]# yum makecache

# 更新系统
[root@k8s-m-01 ~]# yum update -y --exclud=kernel*

# 安装基础常用软件
[root@k8s-m-01 ~]# yum install wget expect vim net-tools ntp bash-completion ipvsadm ipset jq iptables conntrack sysstat libseccomp -y

# 更新系统内核（docker 对系统内核要求比较高，最好使用4.4+）
    [root@k8s-m-01 ~]# wget https://elrepo.org/linux/kernel/el7/x86_64/RPMS/kernel-lt-5.4.107-1.el7.elrepo.x86_64.rpm
    [root@k8s-m-01 ~]# https://elrepo.org/linux/kernel/el7/x86_64/RPMS/kernel-lt-devel-5.4.107-1.el7.elrepo.x86_64.rpm
    ## 安装系统内容
    [root@k8s-m-01 ~]# yum localinstall -y kernel-lt*
    ## 调到默认启动
    [root@k8s-m-01 ~]# grub2-set-default  0 && grub2-mkconfig -o /etc/grub2.cfg
    ## 查看当前默认启动的内核
    [root@k8s-m-01 ~]# grubby --default-kernel
    ## 重启
    [root@k8s-m-01 ~]# reboot

# 安装IPVS
    yum install -y conntrack-tools ipvsadm ipset conntrack libseccomp

   	## 加载IPVS模块
cat > /etc/sysconfig/modules/ipvs.modules <<EOF
#!/bin/bash
ipvs_modules="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 nf_conntrack"
for kernel_module in \${ipvs_modules}; do
/sbin/modinfo -F filename \${kernel_module} > /dev/null 2>&1
if [ $? -eq 0 ]; then
/sbin/modprobe \${kernel_module}
fi
done
EOF

    chmod 755 /etc/sysconfig/modules/ipvs.modules && bash /etc/sysconfig/modules/ipvs.modules && lsmod | grep ip_vs

# 修改内核启动参数
cat > /etc/sysctl.d/k8s.conf << EOF
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.ipv4.tcp_keepalive_time = 600
net.ipv4.tcp.keepaliv.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.top_timestamps = 0
net.core.somaxconn = 16384
EOF

# 立即生效
sysctl --system

安装docker

# 卸载之前安装过得docker
[root@k8s-m-01 ~]# sudo yum remove docker docker-common docker-selinux docker-engine

# 安装docker需要的依赖包
[root@k8s-m-01 ~]# sudo yum install -y yum-utils device-mapper-persistent-data lvm2

# 安装dockeryum源
[root@k8s-m-01 ~]# wget -O /etc/yum.repos.d/docker-ce.repo https://repo.huaweicloud.com/docker-ce/linux/centos/docker-ce.repo

# 安装docker
[root@k8s-m-01 ~]# yum install docker-ce -y

# 设置开机自启动
[root@k8s-m-01 ~]# systemctl enable --now docker.service

集群证书

# 以下命令只需要在master01执行即可

# 安装证书生成工具
wget https://pkg.cfssl.org/R1.2/cfssl_linux-amd64
wget https://pkg.cfssl.org/R1.2/cfssljson_linux-amd64

# 设置执行权限
chmod +x cfssljson_linux-amd64
chmod +x cfssl_linux-amd64

# 移动到/usr/local/bin
mv cfssljson_linux-amd64 cfssljson
mv cfssl_linux-amd64 cfssl
mv cfssljson cfssl /usr/local/bin

生成根证书

mkdir -p /opt/cert/ca

cat > /opt/cert/ca/ca-config.json <<EOF
{
  "signing": {
    "default": {
      "expiry": "8760h"
    },
    "profiles": {
      "kubernetes": {
        "usages": [
          "signing",
          "key encipherment",
          "server auth",
          "client auth"
        ],
           "expiry": "8760h"
      }
    }
  }
}
EOF

生成根证书请求文件

cat > /opt/cert/ca/ca-csr.json << EOF
{
  "CN": "kubernetes",
  "key": {
    "algo": "rsa",
    "size": 2048
  },
  "names":[{
    "C": "CN",
    "ST": "ShangHai",
    "L": "ShangHai"
  }]
}
EOF

生成根证书

[root@k8s-m-01 /opt/cert/ca]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
2021/03/26 17:34:55 [INFO] generating a new CA key and certificate from CSR
2021/03/26 17:34:55 [INFO] generate received request
2021/03/26 17:34:55 [INFO] received CSR
2021/03/26 17:34:55 [INFO] generating key: rsa-2048
2021/03/26 17:34:56 [INFO] encoded CSR
2021/03/26 17:34:56 [INFO] signed certificate with serial number 661764636777400005196465272245416169967628201792
[root@k8s-m-01 /opt/cert/ca]# ll
total 20
-rw-r--r-- 1 root root  285 Mar 26 17:34 ca-config.json
-rw-r--r-- 1 root root  960 Mar 26 17:34 ca.csr
-rw-r--r-- 1 root root  153 Mar 26 17:34 ca-csr.json
-rw------- 1 root root 1675 Mar 26 17:34 ca-key.pem
-rw-r--r-- 1 root root 1281 Mar 26 17:34 ca.pem

部署ETCD集群

节点规划

192.168.15.51 etcd-01
192.168.15.52 etcd-01
192.168.15.53 etcd-01

创建ETCD集群证书

mkdir -p /opt/cert/etcd
cd /opt/cert/etcd

cat > etcd-csr.json << EOF
{
    "CN": "etcd",
    "hosts": [
        "127.0.0.1",
        "192.168.15.51",
        "192.168.15.52",
        "192.168.15.53",
        "192.168.15.54",
        "192.168.15.55",
        "192.168.15.56"
    ],
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
          "C": "CN",
          "ST": "ShangHai",
          "L": "ShangHai"
        }
    ]
}
EOF

生成ETCD证书

[root@k8s-m-01 /opt/cert/etcd]# cfssl gencert -ca=../ca/ca.pem -ca-key=../ca/ca-key.pem -config=../ca/ca-config.json -profile=kubernetes etcd-csr.json | cfssljson -bare etcd
2021/03/26 17:38:57 [INFO] generate received request
2021/03/26 17:38:57 [INFO] received CSR
2021/03/26 17:38:57 [INFO] generating key: rsa-2048
2021/03/26 17:38:58 [INFO] encoded CSR
2021/03/26 17:38:58 [INFO] signed certificate with serial number 179909685000914921289186132666286329014949215773
2021/03/26 17:38:58 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").

分发ETCD证书

[root@k8s-m-01 /opt/cert/etcd]# for ip in m1 m2 m3;do 
   ssh root@${ip} "mkdir -pv /etc/etcd/ssl"
   scp ../ca/ca*.pem  root@${ip}:/etc/etcd/ssl
   scp ./etcd*.pem  root@${ip}:/etc/etcd/ssl   
 done
 
mkdir: created directory ‘/etc/etcd’
mkdir: created directory ‘/etc/etcd/ssl’
ca-key.pem                                                      100% 1675   299.2KB/s   00:00    
ca.pem                                                          100% 1281   232.3KB/s   00:00    
etcd-key.pem                                                    100% 1675     1.4MB/s   00:00    
etcd.pem                                                        100% 1379   991.0KB/s   00:00    
mkdir: created directory ‘/etc/etcd’
mkdir: created directory ‘/etc/etcd/ssl’
ca-key.pem                                                      100% 1675     1.1MB/s   00:00    
ca.pem                                                          100% 1281   650.8KB/s   00:00    
etcd-key.pem                                                    100% 1675   507.7KB/s   00:00    
etcd.pem                                                        100% 1379   166.7KB/s   00:00    
mkdir: created directory ‘/etc/etcd’
mkdir: created directory ‘/etc/etcd/ssl’
ca-key.pem                                                      100% 1675   109.1KB/s   00:00    
ca.pem                                                          100% 1281   252.9KB/s   00:00    
etcd-key.pem                                                    100% 1675   121.0KB/s   00:00    
etcd.pem                                                        100% 1379   180.4KB/s   00:00    
[root@k8s-m-01 /opt/cert/etcd]# ll /etc/etcd/ssl/
total 16
-rw------- 1 root root 1675 Mar 26 17:41 ca-key.pem
-rw-r--r-- 1 root root 1281 Mar 26 17:41 ca.pem
-rw------- 1 root root 1675 Mar 26 17:41 etcd-key.pem
-rw-r--r-- 1 root root 1379 Mar 26 17:41 etcd.pem

部署ETCD

# 下载ETCD安装包
wget https://mirrors.huaweicloud.com/etcd/v3.3.24/etcd-v3.3.24-linux-amd64.tar.gz

# 解压
tar xf etcd-v3.3.24-linux-amd64

# 分发至其他节点
for i in m1 m2 m3
do
	scp ./etcd-v3.3.24-linux-amd64/etcd* root@$i:/usr/local/bin/
done
[root@k8s-m-01 /opt/etcd-v3.3.24-linux-amd64]# etcd --version
etcd Version: 3.3.24
Git SHA: bdd57848d
Go Version: go1.12.17
Go OS/Arch: linux/amd64

注册ETCD服务

# 在三台master节点上执行
mkdir -pv /etc/kubernetes/conf/etcd

ETCD_NAME=`hostname`
INTERNAL_IP=`hostname -i`
INITIAL_CLUSTER=k8s-m-01=https://192.168.15.51:2380,k8s-m-02=https://192.168.15.52:2380,k8s-m-03=https://192.168.15.53:2380

cat << EOF | sudo tee /usr/lib/systemd/system/etcd.service
[Unit]
Description=etcd
Documentation=https://github.com/coreos

[Service]
ExecStart=/usr/local/bin/etcd \\
  --name ${ETCD_NAME} \\
  --cert-file=/etc/etcd/ssl/etcd.pem \\
  --key-file=/etc/etcd/ssl/etcd-key.pem \\
  --peer-cert-file=/etc/etcd/ssl/etcd.pem \\
  --peer-key-file=/etc/etcd/ssl/etcd-key.pem \\
  --trusted-ca-file=/etc/etcd/ssl/ca.pem \\
  --peer-trusted-ca-file=/etc/etcd/ssl/ca.pem \\
  --peer-client-cert-auth \\
  --client-cert-auth \\
  --initial-advertise-peer-urls https://${INTERNAL_IP}:2380 \\
  --listen-peer-urls https://${INTERNAL_IP}:2380 \\
  --listen-client-urls https://${INTERNAL_IP}:2379,https://127.0.0.1:2379 \\
  --advertise-client-urls https://${INTERNAL_IP}:2379 \\
  --initial-cluster-token etcd-cluster \\
  --initial-cluster ${INITIAL_CLUSTER} \\
  --initial-cluster-state new \\
  --data-dir=/var/lib/etcd
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

# 启动ETCD服务
systemctl enable --now etcd

测试ETCD服务

# 第一种方式
ETCDCTL_API=3 etcdctl \
--cacert=/etc/etcd/ssl/etcd.pem \
--cert=/etc/etcd/ssl/etcd.pem \
--key=/etc/etcd/ssl/etcd-key.pem \
--endpoints="https://192.168.15.51:2379,https://192.168.15.52:2379,https://192.168.15.53:2379" \
endpoint status --write-out='table'

# 第二种方式
ETCDCTL_API=3 etcdctl \
--cacert=/etc/etcd/ssl/etcd.pem \
--cert=/etc/etcd/ssl/etcd.pem \
--key=/etc/etcd/ssl/etcd-key.pem \
--endpoints="https://192.168.15.51:2379,https://192.168.15.52:2379,https://192.168.15.53:2379" \
member list --write-out='table'

部署master节点

主要把master节点上的各个组件部署成功。

集群规划

192.168.15.51 172.16.1.51 k8s-m-01 m1 
192.168.15.52 172.16.1.52 k8s-m-02 m2
192.168.15.53 172.16.1.53 k8s-m-03 m3

kube-apiserver、控制器、调度器、flannel、etcd、kubelet、kube-proxy、DNS

创建证书

创建集群证书

创建集群CA证书

# 只需要在master01上执行
[root@kubernetes-master-01 k8s]# mkdir /opt/cert/k8s
[root@kubernetes-master-01 k8s]# cd /opt/cert/k8s
[root@kubernetes-master-01 k8s]# pwd
/opt/cert/k8s
[root@kubernetes-master-01 k8s]# cat > ca-config.json << EOF
{
  "signing": {
    "default": {
      "expiry": "87600h"
    },
    "profiles": {
      "kubernetes": {
         "expiry": "87600h",
         "usages": [
            "signing",
            "key encipherment",
            "server auth",
            "client auth"
        ]
      }
    }
  }
}
EOF
[root@kubernetes-master-01 k8s]# cat > ca-csr.json << EOF
{
    "CN": "kubernetes",
    "key": {
        "algo": "rsa",
        "size": 2048
    },
    "names": [
        {
            "C": "CN",
            "L": "ShangHai",
            "ST": "ShangHai"
        }
    ]
}
EOF
[root@kubernetes-master-01 k8s]# ll
total 8
-rw-r--r-- 1 root root 294 Sep 13 19:59 ca-config.json
-rw-r--r-- 1 root root 212 Sep 13 20:01 ca-csr.json
[root@kubernetes-master-01 k8s]# cfssl gencert -initca ca-csr.json | cfssljson -bare ca -
2020/09/13 20:01:45 [INFO] generating a new CA key and certificate from CSR
2020/09/13 20:01:45 [INFO] generate received request
2020/09/13 20:01:45 [INFO] received CSR
2020/09/13 20:01:45 [INFO] generating key: rsa-2048
2020/09/13 20:01:46 [INFO] encoded CSR
2020/09/13 20:01:46 [INFO] signed certificate with serial number 588993429584840635805985813644877690042550093427
[root@kubernetes-master-01 k8s]# ll
total 20
-rw-r--r-- 1 root root  294 Sep 13 19:59 ca-config.json
-rw-r--r-- 1 root root  960 Sep 13 20:01 ca.csr
-rw-r--r-- 1 root root  212 Sep 13 20:01 ca-csr.json
-rw------- 1 root root 1679 Sep 13 20:01 ca-key.pem
-rw-r--r-- 1 root root 1273 Sep 13 20:01 ca.pem

创建集群普通证书

创建集群各个组件之间的证书

创建kube-apiserver的证书

[root@k8s-m-01 /opt/cert/k8s]# mkdir /opt/cert/k8s
[root@k8s-m-01 /opt/cert/k8s]# cd /opt/cert/k8s
[root@k8s-m-01 /opt/cert/k8s]# cat > server-csr.json << EOF
{
    "CN": "kubernetes",
    "hosts": [
        "127.0.0.1",
        "192.168.15.51",
        "192.168.15.52",
        "192.168.15.53",
        "192.168.15.54",
        "192.168.15.55",
        "192.168.15.56",
        "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",
            "L": "ShangHai",
            "ST": "ShangHai"
        }
    ]
}
EOF

[root@k8s-m-01 /opt/cert/k8s]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes server-csr.json | cfssljson -bare server
2021/03/29 09:31:02 [INFO] generate received request
2021/03/29 09:31:02 [INFO] received CSR
2021/03/29 09:31:02 [INFO] generating key: rsa-2048
2021/03/29 09:31:02 [INFO] encoded CSR
2021/03/29 09:31:02 [INFO] signed certificate with serial number 475285860832876170844498652484239182294052997083
2021/03/29 09:31:02 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").
[root@k8s-m-01 /opt/cert/k8s]# ll
total 36
-rw-r--r-- 1 root root  294 Mar 29 09:13 ca-config.json
-rw-r--r-- 1 root root  960 Mar 29 09:16 ca.csr
-rw-r--r-- 1 root root  214 Mar 29 09:14 ca-csr.json
-rw------- 1 root root 1675 Mar 29 09:16 ca-key.pem
-rw-r--r-- 1 root root 1281 Mar 29 09:16 ca.pem
-rw-r--r-- 1 root root 1245 Mar 29 09:31 server.csr
-rw-r--r-- 1 root root  603 Mar 29 09:29 server-csr.json
-rw------- 1 root root 1675 Mar 29 09:31 server-key.pem
-rw-r--r-- 1 root root 1574 Mar 29 09:31 server.pem

创建controller-manager的证书

[root@k8s-m-01 /opt/cert/k8s]# cat > kube-controller-manager-csr.json << EOF
> {
>     "CN": "system:kube-controller-manager",
>     "hosts": [
>         "127.0.0.1",
>         "192.168.15.51",
>         "192.168.15.52",
>         "192.168.15.53",
>         "192.168.15.54",
>         "192.168.15.55",
>         "192.168.15.56",
>     ],
>     "key": {
>         "algo": "rsa",
>         "size": 2048
>     },
>     "names": [
>         {
>             "C": "CN",
>             "L": "ShangHai",
>             "ST": "ShangHai",
>             "O": "system:kube-controller-manager",
>             "OU": "System"
>         }
>     ]
> }
> EOF
[root@k8s-m-01 /opt/cert/k8s]# vim kube-controller-manager-csr.json 
[root@k8s-m-01 /opt/cert/k8s]# 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
2021/03/29 09:33:31 [INFO] generate received request
2021/03/29 09:33:31 [INFO] received CSR
2021/03/29 09:33:31 [INFO] generating key: rsa-2048
2021/03/29 09:33:31 [INFO] encoded CSR
2021/03/29 09:33:31 [INFO] signed certificate with serial number 159207911625502250093013220742142932946474251607
2021/03/29 09:33:31 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").

创建kube-scheduler的证书

[root@k8s-m-01 /opt/cert/k8s]# cat > kube-scheduler-csr.json << EOF
> {
>     "CN": "system:kube-scheduler",
>     "hosts": [
>         "127.0.0.1",
>         "192.168.15.51",
>         "192.168.15.52",
>         "192.168.15.53",
>         "192.168.15.54",
>         "192.168.15.55",
>         "192.168.15.56"
>     ],
>     "key": {
>         "algo": "rsa",
>         "size": 2048
>     },
>     "names": [
>         {
>             "C": "CN",
>             "L": "BeiJing",
>             "ST": "BeiJing",
>             "O": "system:kube-scheduler",
>             "OU": "System"
>         }
>     ]
> }
> EOF
[root@k8s-m-01 /opt/cert/k8s]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-scheduler-csr.json | cfssljson -bare kube-scheduler
2021/03/29 09:34:57 [INFO] generate received request
2021/03/29 09:34:57 [INFO] received CSR
2021/03/29 09:34:57 [INFO] generating key: rsa-2048
2021/03/29 09:34:58 [INFO] encoded CSR
2021/03/29 09:34:58 [INFO] signed certificate with serial number 38647006614878532408684142936672497501281226307
2021/03/29 09:34:58 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").

创建kube-proxy证书

[root@k8s-m-01 /opt/cert/k8s]# cat > kube-proxy-csr.json << EOF
> {
>     "CN":"system:kube-proxy",
>     "hosts":[],
>     "key":{
>         "algo":"rsa",
>         "size":2048
>     },
>     "names":[
>         {
>             "C":"CN",
>             "L":"BeiJing",
>             "ST":"BeiJing",
>             "O":"system:kube-proxy",
>             "OU":"System"
>         }
>     ]
> }
> EOF
[root@k8s-m-01 /opt/cert/k8s]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes kube-proxy-csr.json | cfssljson -bare kube-proxy
2021/03/29 09:37:44 [INFO] generate received request
2021/03/29 09:37:44 [INFO] received CSR
2021/03/29 09:37:44 [INFO] generating key: rsa-2048
2021/03/29 09:37:44 [INFO] encoded CSR
2021/03/29 09:37:44 [INFO] signed certificate with serial number 703321465371340829919693910125364764243453439484
2021/03/29 09:37:44 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").

创建集群管理员证书

[root@k8s-m-01 /opt/cert/k8s]# cat > admin-csr.json << EOF
> {
>     "CN":"admin",
>     "key":{
>         "algo":"rsa",
>         "size":2048
>     },
>     "names":[
>         {
>             "C":"CN",
>             "L":"BeiJing",
>             "ST":"BeiJing",
>             "O":"system:masters",
>             "OU":"System"
>         }
>     ]
> }
> EOF
[root@k8s-m-01 /opt/cert/k8s]# cfssl gencert -ca=ca.pem -ca-key=ca-key.pem -config=ca-config.json -profile=kubernetes admin-csr.json | cfssljson -bare admin
2021/03/29 09:36:26 [INFO] generate received request
2021/03/29 09:36:26 [INFO] received CSR
2021/03/29 09:36:26 [INFO] generating key: rsa-2048
2021/03/29 09:36:26 [INFO] encoded CSR
2021/03/29 09:36:26 [INFO] signed certificate with serial number 258862825289855717894394114308507213391711602858
2021/03/29 09:36:26 [WARNING] This certificate lacks a "hosts" field. This makes it unsuitable for
websites. For more information see the Baseline Requirements for the Issuance and Management
of Publicly-Trusted Certificates, v.1.1.6, from the CA/Browser Forum (https://cabforum.org);
specifically, section 10.2.3 ("Information Requirements").

颁发证书

[root@k8s-m-01 /opt/cert/k8s]# mkdir -pv /etc/kubernetes/ssl
[root@k8s-m-01 /opt/cert/k8s]# cp -p ./{ca*pem,server*pem,kube-controller-manager*pem,kube-scheduler*.pem,kube-proxy*pem,admin*.pem} /etc/kubernetes/ssl

[root@k8s-m-01 /opt/cert/k8s]# for i in m1 m2 m3;do
ssh root@$i "mkdir -pv /etc/kubernetes/ssl"
scp /etc/kubernetes/ssl/* root@$i:/etc/kubernetes/ssl
done

编写配置文件以及下载安装包

下载安装包

# 下载安装包
## 下载server安装包
[root@k8s-m-01 /opt/data]# wget https://dl.k8s.io/v1.18.8/kubernetes-server-linux-amd64.tar.gz

## 从容器中复制
[root@k8s-m-01 /opt/data]# docker run -it  registry.cn-hangzhou.aliyuncs.com/k8sos/k8s:v1.18.8.1 bash

## 分发组件
[root@k8s-m-01 /opt/data]# tar -xf kubernetes-server-linux-amd64.tar.gz
[root@k8s-m-01 /opt/data]# cd kubernetes/server/bin
[root@k8s-m-01 /opt/data]# for i in m1 m2 m3 ;do  scp kube-apiserver kube-controller-manager [root@k8s-m-01 /opt/cert/k8s]#kube-proxy kubectl kubelet kube-scheduler root@$i:/usr/local/bin; done

创建集群配置文件

创建kube-controller-manager.kubeconfig

## 创建kube-controller-manager.kubeconfig
export KUBE_APISERVER="https://192.168.15.56:8443"

# 设置集群参数
kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kube-controller-manager.kubeconfig

# 设置客户端认证参数
kubectl config set-credentials "kube-controller-manager" \
  --client-certificate=/etc/kubernetes/ssl/kube-controller-manager.pem \
  --client-key=/etc/kubernetes/ssl/kube-controller-manager-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-controller-manager.kubeconfig

# 设置上下文参数（在上下文参数中将集群参数和用户参数关联起来）
kubectl config set-context default \
  --cluster=kubernetes \
  --user="kube-controller-manager" \
  --kubeconfig=kube-controller-manager.kubeconfig

# 配置默认上下文
kubectl config use-context default --kubeconfig=kube-controller-manager.kubeconfig

创建kube-scheduler.kubeconfig

# 创建kube-scheduler.kubeconfig
export KUBE_APISERVER="https://192.168.15.56:8443"

# 设置集群参数
kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kube-scheduler.kubeconfig

# 设置客户端认证参数
kubectl config set-credentials "kube-scheduler" \
  --client-certificate=/etc/kubernetes/ssl/kube-scheduler.pem \
  --client-key=/etc/kubernetes/ssl/kube-scheduler-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-scheduler.kubeconfig

# 设置上下文参数（在上下文参数中将集群参数和用户参数关联起来）
kubectl config set-context default \
  --cluster=kubernetes \
  --user="kube-scheduler" \
  --kubeconfig=kube-scheduler.kubeconfig

# 配置默认上下文
kubectl config use-context default --kubeconfig=kube-scheduler.kubeconfig

创建kube-proxy.kubeconfig集群配置文件

## 创建kube-proxy.kubeconfig集群配置文件
export KUBE_APISERVER="https://192.168.15.56:8443"

# 设置集群参数
kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kube-proxy.kubeconfig

# 设置客户端认证参数
kubectl config set-credentials "kube-proxy" \
  --client-certificate=/etc/kubernetes/ssl/kube-proxy.pem \
  --client-key=/etc/kubernetes/ssl/kube-proxy-key.pem \
  --embed-certs=true \
  --kubeconfig=kube-proxy.kubeconfig

# 设置上下文参数（在上下文参数中将集群参数和用户参数关联起来）
kubectl config set-context default \
  --cluster=kubernetes \
  --user="kube-proxy" \
  --kubeconfig=kube-proxy.kubeconfig

# 配置默认上下文
kubectl config use-context default --kubeconfig=kube-proxy.kubeconfig

创建超级管理员的集群配置文件

export KUBE_APISERVER="https://192.168.15.56:8443"

# 设置集群参数
kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=admin.kubeconfig

# 设置客户端认证参数
kubectl config set-credentials "admin" \
  --client-certificate=/etc/kubernetes/ssl/admin.pem \
  --client-key=/etc/kubernetes/ssl/admin-key.pem \
  --embed-certs=true \
  --kubeconfig=admin.kubeconfig

# 设置上下文参数（在上下文参数中将集群参数和用户参数关联起来）
kubectl config set-context default \
  --cluster=kubernetes \
  --user="admin" \
  --kubeconfig=admin.kubeconfig

# 配置默认上下文
kubectl config use-context default --kubeconfig=admin.kubeconfig

颁发集群配置文件

[root@k8s-m-01 /opt/cert/k8s]# for i in m1 m2 m3; do
> ssh root@$i  "mkdir -pv /etc/kubernetes/cfg"
> scp ./*.kubeconfig root@$i:/etc/kubernetes/cfg
> done
[root@k8s-m-01 /opt/cert/k8s]# ll /etc/kubernetes/cfg/
total 32
-rw------- 1 root root 6103 Mar 29 10:32 admin.kubeconfig
-rw------- 1 root root 6319 Mar 29 10:32 kube-controller-manager.kubeconfig
-rw------- 1 root root 6141 Mar 29 10:32 kube-proxy.kubeconfig
-rw------- 1 root root 6261 Mar 29 10:32 kube-scheduler.kubeconfig

创建集群token

# 只需要创建一次
# 必须要用自己机器创建的Token
TLS_BOOTSTRAPPING_TOKEN=`head -c 16 /dev/urandom | od -An -t x | tr -d ' '`

cat > token.csv << EOF
${TLS_BOOTSTRAPPING_TOKEN},kubelet-bootstrap,10001,"system:kubelet-bootstrap"
EOF

# 分发集群token，用于集群TLS认证
[root@k8s-m-01 /opt/cert/k8s]# for i in m1 m2 m3;do
> scp token.csv root@$i:/etc/kubernetes/cfg/
> done

部署各个组件

安装各个组件，使其可以正常工作

安装kube-apiserver

创建kube-apiserver的配置文件

# 在所有的master节点上执行
KUBE_APISERVER_IP=`hostname -i`

cat > /etc/kubernetes/cfg/kube-apiserver.conf << EOF
KUBE_APISERVER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/var/log/kubernetes \\
--advertise-address=${KUBE_APISERVER_IP} \\
--default-not-ready-toleration-seconds=360 \\
--default-unreachable-toleration-seconds=360 \\
--max-mutating-requests-inflight=2000 \\
--max-requests-inflight=4000 \\
--default-watch-cache-size=200 \\
--delete-collection-workers=2 \\
--bind-address=0.0.0.0 \\
--secure-port=6443 \\
--allow-privileged=true \\
--service-cluster-ip-range=10.96.0.0/16 \\
--service-node-port-range=30000-52767 \\
--enable-admission-plugins=NamespaceLifecycle,LimitRanger,ServiceAccount,ResourceQuota,NodeRestriction \\
--authorization-mode=RBAC,Node \\
--enable-bootstrap-token-auth=true \\
--token-auth-file=/etc/kubernetes/cfg/token.csv \\
--kubelet-client-certificate=/etc/kubernetes/ssl/server.pem \\
--kubelet-client-key=/etc/kubernetes/ssl/server-key.pem \\
--tls-cert-file=/etc/kubernetes/ssl/server.pem  \\
--tls-private-key-file=/etc/kubernetes/ssl/server-key.pem \\
--client-ca-file=/etc/kubernetes/ssl/ca.pem \\
--service-account-key-file=/etc/kubernetes/ssl/ca-key.pem \\
--audit-log-maxage=30 \\
--audit-log-maxbackup=3 \\
--audit-log-maxsize=100 \\
--audit-log-path=/var/log/kubernetes/k8s-audit.log \\
--etcd-servers=https://192.168.15.51:2379,https://192.168.15.52:2379,https://192.168.15.53:2379 \\
--etcd-cafile=/etc/etcd/ssl/ca.pem \\
--etcd-certfile=/etc/etcd/ssl/etcd.pem \\
--etcd-keyfile=/etc/etcd/ssl/etcd-key.pem"
EOF

注册kube-apiserver的服务

# 在所有的master节点上执行
[root@k8s-m-01 /opt/cert/k8s]# cat > /usr/lib/systemd/system/kube-apiserver.service << EOF
[Unit]
Description=Kubernetes API Server
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
EnvironmentFile=/etc/kubernetes/cfg/kube-apiserver.conf
ExecStart=/usr/local/bin/kube-apiserver \$KUBE_APISERVER_OPTS
Restart=on-failure
RestartSec=10
Type=notify
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

[root@k8s-m-01 /opt/cert/k8s]# systemctl daemon-reload

对kube-apiserver做高可用

安装高可用软件

# 三台master节点都需要安装
# keeplived + haproxy
[root@k8s-m-01 ~]# yum install -y keepalived haproxy

修改keepalived配置文件

# 根据节点的不同，修改的配置也不同
mv /etc/keepalived/keepalived.conf /etc/keepalived/keepalived.conf_bak

cd /etc/keepalived

KUBE_APISERVER_IP=`hostname -i`

cat > /etc/keepalived/keepalived.conf <<EOF
! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
}
vrrp_script chk_kubernetes {
    script "/etc/keepalived/check_kubernetes.sh"
    interval 2
    weight -5
    fall 3
    rise 2
}
vrrp_instance VI_1 {
    state MASTER
    interface eth0
    mcast_src_ip ${KUBE_APISERVER_IP}
    virtual_router_id 51
    priority 100
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass K8SHA_KA_AUTH
    }
    virtual_ipaddress {
        192.168.15.56
    }
}
EOF

[root@k8s-m-01 /etc/keepalived]# systemctl enable --now keepalived

修改haproxy配置文件

# 高可用软件
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 monitor-in
  bind *:33305
  mode http
  option httplog
  monitor-uri /monitor

listen stats
  bind    *:8006
  mode    http
  stats   enable
  stats   hide-version
  stats   uri       /stats
  stats   refresh   30s
  stats   realm     Haproxy\ Statistics
  stats   auth      admin:admin

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 kubernetes-master-01    192.168.15.51:6443  check inter 2000 fall 2 rise 2 weight 100
  server kubernetes-master-02    192.168.15.52:6443  check inter 2000 fall 2 rise 2 weight 100
  server kubernetes-master-03    192.168.15.53:6443  check inter 2000 fall 2 rise 2 weight 100
EOF

[root@k8s-m-01 /etc/keepalived]# systemctl enable --now haproxy.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/haproxy.service to /usr/lib/systemd/system/haproxy.service.

部署TLS

apiserver 动态签署颁发到Node节点，实现证书签署自动化

创建集群配置文件

# 只需要在一台节点上执行
export KUBE_APISERVER="https://192.168.15.56:8443"

# 设置集群参数
kubectl config set-cluster kubernetes \
  --certificate-authority=/etc/kubernetes/ssl/ca.pem \
  --embed-certs=true \
  --server=${KUBE_APISERVER} \
  --kubeconfig=kubelet-bootstrap.kubeconfig

# 设置客户端认证参数,此处token必须用上叙token.csv中的token
kubectl config set-credentials "kubelet-bootstrap" \
  --token=928419f8458958ce0a80ad37fe5d47c1 \  # 使用自己的token.csv里面的token
  --kubeconfig=kubelet-bootstrap.kubeconfig

# 设置上下文参数（在上下文参数中将集群参数和用户参数关联起来）
kubectl config set-context default \
  --cluster=kubernetes \
  --user="kubelet-bootstrap" \
  --kubeconfig=kubelet-bootstrap.kubeconfig

# 配置默认上下文
kubectl config use-context default --kubeconfig=kubelet-bootstrap.kubeconfig

颁发证书

# 颁发集群配置文件
[root@k8s-m-01 /opt/cert/k8s]# for i in m1 m2 m3; do
> scp kubelet-bootstrap.kubeconfig root@$i:/etc/kubernetes/cfg/
> done

创建TLS低权限用户

# 创建一个低权限用户
[root@k8s-m-01 /opt/cert/k8s]# kubectl create clusterrolebinding kubelet-bootstrap \
> --clusterrole=system:node-bootstrapper \
> --user=kubelet-bootstrap
clusterrolebinding.rbac.authorization.k8s.io/kubelet-bootstrap created

部署contorller-manager

编辑配置文件

# 需要在三台master节点上执行
cat > /etc/kubernetes/cfg/kube-controller-manager.conf << EOF
KUBE_CONTROLLER_MANAGER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/var/log/kubernetes \\
--leader-elect=true \\
--cluster-name=kubernetes \\
--bind-address=127.0.0.1 \\
--allocate-node-cidrs=true \\
--cluster-cidr=10.244.0.0/12 \\
--service-cluster-ip-range=10.96.0.0/16 \\
--cluster-signing-cert-file=/etc/kubernetes/ssl/ca.pem \\
--cluster-signing-key-file=/etc/kubernetes/ssl/ca-key.pem  \\
--root-ca-file=/etc/kubernetes/ssl/ca.pem \\
--service-account-private-key-file=/etc/kubernetes/ssl/ca-key.pem \\
--kubeconfig=/etc/kubernetes/cfg/kube-controller-manager.kubeconfig \\
--tls-cert-file=/etc/kubernetes/ssl/kube-controller-manager.pem \\
--tls-private-key-file=/etc/kubernetes/ssl/kube-controller-manager-key.pem \\
--experimental-cluster-signing-duration=87600h0m0s \\
--controllers=*,bootstrapsigner,tokencleaner \\
--use-service-account-credentials=true \\
--node-monitor-grace-period=10s \\
--horizontal-pod-autoscaler-use-rest-clients=true"
EOF

注册服务

# 需要在三台master节点上执行
cat > /usr/lib/systemd/system/kube-controller-manager.service << EOF
[Unit]
Description=Kubernetes Controller Manager
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
EnvironmentFile=/etc/kubernetes/cfg/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

启动

[root@k8s-m-01 /opt/cert/k8s]# systemctl daemon-reload 
[root@k8s-m-01 /opt/cert/k8s]# systemctl enable --now kube-controller-manager.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-controller-manager.service to /usr/lib/systemd/system/kube-controller-manager.service.

部署kube-scheduler

编写配置文件

# 三台机器上都需要执行
cat > /etc/kubernetes/cfg/kube-scheduler.conf << EOF
KUBE_SCHEDULER_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/var/log/kubernetes \\
--kubeconfig=/etc/kubernetes/cfg/kube-scheduler.kubeconfig \\
--leader-elect=true \\
--master=http://127.0.0.1:8080 \\
--bind-address=127.0.0.1 "
EOF

注册服务

# 三台节点上都需要执行
cat > /usr/lib/systemd/system/kube-scheduler.service << EOF
[Unit]
Description=Kubernetes Scheduler
Documentation=https://github.com/kubernetes/kubernetes
After=network.target

[Service]
EnvironmentFile=/etc/kubernetes/cfg/kube-scheduler.conf
ExecStart=/usr/local/bin/kube-scheduler \$KUBE_SCHEDULER_OPTS
Restart=on-failure
RestartSec=5

[Install]
WantedBy=multi-user.target
EOF

启动

[root@k8s-m-01 /opt/cert/k8s]# systemctl daemon-reload 
[root@k8s-m-01 /opt/cert/k8s]# systemctl enable --now kube-scheduler.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-scheduler.service to /usr/lib/systemd/system/kube-scheduler.service.

查看集群状态

[root@k8s-m-01 /opt/cert/k8s]# kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok                  
controller-manager   Healthy   ok                  
etcd-2               Healthy   {"health":"true"}   
etcd-1               Healthy   {"health":"true"}   
etcd-0               Healthy   {"health":"true"}

部署kubelet服务

创建kubelet服务配置文件

# 需要在三台master节点上执行
KUBE_HOSTNAME=`hostname`

cat > /etc/kubernetes/cfg/kubelet.conf << EOF
KUBELET_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/var/log/kubernetes \\
--hostname-override=${KUBE_HOSTNAME} \\
--container-runtime=docker \\
--kubeconfig=/etc/kubernetes/cfg/kubelet.kubeconfig \\
--bootstrap-kubeconfig=/etc/kubernetes/cfg/kubelet-bootstrap.kubeconfig \\
--config=/etc/kubernetes/cfg/kubelet-config.yml \\
--cert-dir=/etc/kubernetes/ssl \\
--image-pull-progress-deadline=15m \\
--pod-infra-container-image=registry.cn-hangzhou.aliyuncs.com/k8sos/pause:3.2"
EOF

创建kubelet-config.yaml

# 需要在三台master节点上执行
KUBE_HOSTNAME=`hostname -i`

cat > /etc/kubernetes/cfg/kubelet-config.yml << EOF
kind: KubeletConfiguration
apiVersion: kubelet.config.k8s.io/v1beta1
address: ${KUBE_HOSTNAME}
port: 10250
readOnlyPort: 10255
cgroupDriver: cgroupfs
clusterDNS:
- 10.96.0.2
clusterDomain: cluster.local
failSwapOn: false
authentication:
  anonymous:
    enabled: false
  webhook:
    cacheTTL: 2m0s
    enabled: true
  x509:
    clientCAFile: /etc/kubernetes/ssl/ca.pem
authorization:
  mode: Webhook
  webhook:
    cacheAuthorizedTTL: 5m0s
    cacheUnauthorizedTTL: 30s
evictionHard:
  imagefs.available: 15%
  memory.available: 100Mi
  nodefs.available: 10%
  nodefs.inodesFree: 5%
maxOpenFiles: 1000000
maxPods: 110
EOF

注册kubelet的服务

# 需要在三台master节点上执行
cat > /usr/lib/systemd/system/kubelet.service << EOF
[Unit]
Description=Kubernetes Kubelet
After=docker.service

[Service]
EnvironmentFile=/etc/kubernetes/cfg/kubelet.conf
ExecStart=/usr/local/bin/kubelet \$KUBELET_OPTS
Restart=on-failure
RestartSec=10
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

启动

[root@k8s-m-01 /opt/cert/k8s]# systemctl daemon-reload 
[root@k8s-m-01 /opt/cert/k8s]# systemctl enable --now kubelet.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.
[root@k8s-m-01 /opt/cert/k8s]#

部署kube-proxy

创建配置文件

# 需要在三台master节点上执行
cat > /etc/kubernetes/cfg/kube-proxy.conf << EOF
KUBE_PROXY_OPTS="--logtostderr=false \\
--v=2 \\
--log-dir=/var/log/kubernetes \\
--config=/etc/kubernetes/cfg/kube-proxy-config.yml"
EOF

创建kube-proxy-config.yml

# 需要在三台master节点上执行
KUBE_HOSTNAME=`hostname -i`
HOSTNAME=`hostname`
cat > /etc/kubernetes/cfg/kube-proxy-config.yml << EOF
kind: KubeProxyConfiguration
apiVersion: kubeproxy.config.k8s.io/v1alpha1
bindAddress: ${KUBE_HOSTNAME}
healthzBindAddress: ${KUBE_HOSTNAME}:10256
metricsBindAddress: ${KUBE_HOSTNAME}:10249
clientConnection:
  burst: 200
  kubeconfig: /etc/kubernetes/cfg/kube-proxy.kubeconfig
  qps: 100
hostnameOverride: ${HOSTNAME}
clusterCIDR: 10.96.0.0/16
enableProfiling: true
mode: "ipvs"
kubeProxyIPTablesConfiguration:
  masqueradeAll: false
kubeProxyIPVSConfiguration:
  scheduler: rr
  excludeCIDRs: []
EOF

注册服务

# 需要在三台master节点上执行
cat > /usr/lib/systemd/system/kube-proxy.service << EOF
[Unit]
Description=Kubernetes Proxy
After=network.target

[Service]
EnvironmentFile=/etc/kubernetes/cfg/kube-proxy.conf
ExecStart=/usr/local/bin/kube-proxy \$KUBE_PROXY_OPTS
Restart=on-failure
RestartSec=10
LimitNOFILE=65536

[Install]
WantedBy=multi-user.target
EOF

启动

[root@k8s-m-01 /opt/cert/k8s]# 
[root@k8s-m-01 /opt/cert/k8s]# systemctl daemon-reload 
[root@k8s-m-01 /opt/cert/k8s]# systemctl enable --now kube-proxy.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/kube-proxy.service to /usr/lib/systemd/system/kube-proxy.service.

加入集群节点

查看集群节点加入请求

# 只需要在一台节点上执行即可
[root@k8s-m-01 /opt/cert/k8s]# kubectl get csr
NAME                                                   AGE    SIGNERNAME                                    REQUESTOR           CONDITION
node-csr-5AWYEWZ0DkF4DzHTOP00M2_Ne6on7XMwvryxbwsh90M   6m3s   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending
node-csr-8_Rjm9D7z-04h400v_8RDHHCW3UGILeSRhxx-KkIWNI   6m3s   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending
node-csr-wlHMJiNAkMuPsQPoD6dan8QF4AIlm-x_hVYJt9DukIg   6m2s   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending

批准加入

# 只需要在一台节点上执行即可
[root@k8s-m-01 /opt/cert/k8s]# kubectl certificate approve `kubectl get csr | grep "Pending" | awk '{print $1}'`
certificatesigningrequest.certificates.k8s.io/node-csr-5AWYEWZ0DkF4DzHTOP00M2_Ne6on7XMwvryxbwsh90M approved
certificatesigningrequest.certificates.k8s.io/node-csr-8_Rjm9D7z-04h400v_8RDHHCW3UGILeSRhxx-KkIWNI approved
certificatesigningrequest.certificates.k8s.io/node-csr-wlHMJiNAkMuPsQPoD6dan8QF4AIlm-x_hVYJt9DukIg approved
[root@k8s-m-01 /opt/cert/k8s]# kubectl get nodes
NAME       STATUS   ROLES    AGE   VERSION
k8s-m-01   Ready    <none>   13s   v1.18.8
k8s-m-02   Ready    <none>   12s   v1.18.8
k8s-m-03   Ready    <none>   12s   v1.18.8

安装网络插件

本次选择使用flannel网络插件

下载flannel安装包并安装

# 只需要在一台节点上执行即可
[root@k8s-m-01 /opt/data]# tar -xf flannel-v0.11.0-linux-amd64.tar.gz
[root@k8s-m-01 /opt/data]# for i in m1 m2 m3;do
> scp flanneld mk-docker-opts.sh root@$i:/usr/local/bin/
> done

将flannel配置写入集群数据库

# 只需要在一台节点上执行即可
etcdctl \
--ca-file=/etc/etcd/ssl/ca.pem \
--cert-file=/etc/etcd/ssl/etcd.pem \
--key-file=/etc/etcd/ssl/etcd-key.pem \
--endpoints="https://192.168.15.51:2379,https://192.168.15.52:2379,https://192.168.15.53:2379" \
mk /coreos.com/network/config '{"Network":"10.244.0.0/12", "SubnetLen": 21, "Backend": {"Type": "vxlan", "DirectRouting": true}}'

注册flannel服务

# 需要在三台机器运行
cat > /usr/lib/systemd/system/flanneld.service << EOF
[Unit]
Description=Flanneld address
After=network.target
After=network-online.target
Wants=network-online.target
After=etcd.service
Before=docker.service

[Service]
Type=notify
ExecStart=/usr/local/bin/flanneld \\
  -etcd-cafile=/etc/etcd/ssl/ca.pem \\
  -etcd-certfile=/etc/etcd/ssl/etcd.pem \\
  -etcd-keyfile=/etc/etcd/ssl/etcd-key.pem \\
  -etcd-endpoints=https://192.168.15.51:2379,https://192.168.15.52:2379,https://192.168.15.53:2379 \\
  -etcd-prefix=/coreos.com/network \\
  -ip-masq
ExecStartPost=/usr/local/bin/mk-docker-opts.sh -k DOCKER_NETWORK_OPTIONS -d /run/flannel/subnet.env
Restart=always
RestartSec=5
StartLimitInterval=0
[Install]
WantedBy=multi-user.target
RequiredBy=docker.service
EOF

修改docker启动文件

# 让flannel接管docker网络
sed -i '/ExecStart/s/\(.*\)/#\1/' /usr/lib/systemd/system/docker.service
sed -i '/ExecReload/a ExecStart=/usr/bin/dockerd $DOCKER_NETWORK_OPTIONS -H fd:// --containerd=/run/containerd/containerd.sock' /usr/lib/systemd/system/docker.service
sed -i '/ExecReload/a EnvironmentFile=-/run/flannel/subnet.env' /usr/lib/systemd/system/docker.service

启动

# 先启动flannel,再启动docker
[root@k8s-m-01 ~]# systemctl daemon-reload 
[root@k8s-m-01 ~]# systemctl enable --now flanneld.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/flanneld.service to /usr/lib/systemd/system/flanneld.service.
Created symlink from /etc/systemd/system/docker.service.requires/flanneld.service to /usr/lib/systemd/system/flanneld.service.
[root@k8s-m-01 ~]# systemctl restart docker

验证集群网络

# 集群节点互ping对方的flannel网络

安装集群DNS

# 只需要在一台节点上执行即可
# 下载DNS安装配置文件包
[root@k8s-m-01 ~]# wget https://github.com/coredns/deployment/archive/refs/heads/master.zip
[root@k8s-m-01 ~]# unzip master.zip
[root@k8s-m-01 ~]# cd deployment-master/kubernetes

# 执行部署命令
[root@k8s-m-01 ~/deployment-master/kubernetes]# ./deploy.sh -i 10.96.0.2 -s | kubectl apply -f -

# 验证集群DNS
[root@k8s-m-01 ~/deployment-master/kubernetes]# kubectl get pods -n kube-system
NAME                      READY   STATUS    RESTARTS   AGE
coredns-6ff445f54-m28gw   1/1     Running   0          48s

验证集群

# 绑定一下超管用户（只需要在一台服务器上执行即可）
[root@k8s-m-01 ~/deployment-master/kubernetes]# kubectl create clusterrolebinding cluster-system-anonymous --clusterrole=cluster-admin --user=kubernetes
clusterrolebinding.rbac.authorization.k8s.io/cluster-system-anonymous created

# 验证集群DNS和集群网络成功
[root@k8s-m-01 ~/deployment-master/kubernetes]# kubectl run test -it --rm --image=busybox:1.28.3
If you don't see a command prompt, try pressing enter.
/ # nslookup kubernetes
Server:    10.96.0.2
Address 1: 10.96.0.2 kube-dns.kube-system.svc.cluster.local

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

部署Node节点

node需要部署哪些组件？

kubelet、kube-proxy、flannel

集群规划

192.168.15.54  k8s-n-01 n1
192.168.15.55  k8s-n-02 n2

集群优化

# 做一下免密登录

分发软件包

[root@k8s-m-01 /opt/data]# for i in n1 n2;do scp flanneld mk-docker-opts.sh kubernetes/server/bin/kubelet kubernetes/server/bin/kube-proxy root@$i:/usr/local/bin; done

分发证书

[root@k8s-m-01 /opt/data]# for i in n1 n2; do ssh root@$i "mkdir -pv /etc/kubernetes/ssl"; scp -pr /etc/kubernetes/ssl/{ca*.pem,admin*pem,kube-proxy*pem} root@$i:/etc/kubernetes/ssl; done

分发配置文件

# flanneld、etcd的证书、docker.service

# 分发ETCD证书
[root@k8s-m-01 /etc/etcd/ssl]# for i in n1 n2 ;do ssh root@$i "mkdir -pv /etc/etcd/ssl"; scp ./*  root@$i:/etc/etcd/ssl; done

# 分发flannel和docker的启动脚本
[root@k8s-m-01 /etc/etcd/ssl]# for i in n1 n2;do scp /usr/lib/systemd/system/docker.service root@$i:/usr/lib/systemd/system/docker.service; scp /usr/lib/systemd/system/flanneld.service root@$i:/usr/lib/systemd/system/flanneld.service; done

部署kubelet

[root@k8s-m-01 ~]# for i in n1 n2 ;do 
    ssh root@$i "mkdir -pv  /etc/kubernetes/cfg";
    scp /etc/kubernetes/cfg/kubelet.conf root@$i:/etc/kubernetes/cfg/kubelet.conf; 
    scp /etc/kubernetes/cfg/kubelet-config.yml root@$i:/etc/kubernetes/cfg/kubelet-config.yml; 
    scp /usr/lib/systemd/system/kubelet.service root@$i:/usr/lib/systemd/system/kubelet.service; 
    scp /etc/kubernetes/cfg/kubelet.kubeconfig root@$i:/etc/kubernetes/cfg/kubelet.kubeconfig; 
    scp /etc/kubernetes/cfg/kubelet-bootstrap.kubeconfig root@$i:/etc/kubernetes/cfg/kubelet-bootstrap.kubeconfig; 
    scp /etc/kubernetes/cfg/token.csv root@$i:/etc/kubernetes/cfg/token.csv;
done

# 修改配置文件kubelet-config.yml和kubelet.conf

# 启动kubelet
[root@k8s-n-02 ~]# systemctl enable --now kubelet.service 
Created symlink from /etc/systemd/system/multi-user.target.wants/kubelet.service to /usr/lib/systemd/system/kubelet.service.

部署kube-proxy

[root@k8s-m-01 ~]# for i in n1 n2 ; do 
    scp /etc/kubernetes/cfg/kube-proxy.conf root@$i:/etc/kubernetes/cfg/kube-proxy.conf;  
    scp /etc/kubernetes/cfg/kube-proxy-config.yml root@$i:/etc/kubernetes/cfg/kube-proxy-config.yml ;  
    scp /usr/lib/systemd/system/kube-proxy.service root@$i:/usr/lib/systemd/system/kube-proxy.service;  
    scp /etc/kubernetes/cfg/kube-proxy.kubeconfig root@$i:/etc/kubernetes/cfg/kube-proxy.kubeconfig;
    
    done
# 修改kube-proxy-config.yml中IP和主机名
    
# 启动
[root@k8s-n-02 ~]# systemctl enable --now kube-proxy.service

加入集群

# 查看集群状态
[root@k8s-m-01 ~]# kubectl get cs
NAME                 STATUS    MESSAGE             ERROR
scheduler            Healthy   ok                  
controller-manager   Healthy   ok                  
etcd-0               Healthy   {"health":"true"}   
etcd-1               Healthy   {"health":"true"}   
etcd-2               Healthy   {"health":"true"}   

# 查看加入集群请求
[root@k8s-m-01 ~]# kubectl get csr
NAME                                                   AGE   SIGNERNAME                                    REQUESTOR           CONDITION
node-csr-_yClVuQCNzDb566yZV5sFJmLsoU13Wba0FOhQ5pmVPY   12m   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending
node-csr-m3kFnO7GPBYeBcen5GQ1RdTlt77_rhedLPe97xO_5hw   12m   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Pending

# 批准加入
[root@k8s-m-01 ~]# kubectl certificate approve `kubectl get csr | grep "Pending" | awk '{print $1}'`
certificatesigningrequest.certificates.k8s.io/node-csr-_yClVuQCNzDb566yZV5sFJmLsoU13Wba0FOhQ5pmVPY approved
certificatesigningrequest.certificates.k8s.io/node-csr-m3kFnO7GPBYeBcen5GQ1RdTlt77_rhedLPe97xO_5hw approved

# 查看加入状态
[root@k8s-m-01 ~]# kubectl get csr
NAME                                                   AGE   SIGNERNAME                                    REQUESTOR           CONDITION
node-csr-_yClVuQCNzDb566yZV5sFJmLsoU13Wba0FOhQ5pmVPY   14m   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Approved,Issued
node-csr-m3kFnO7GPBYeBcen5GQ1RdTlt77_rhedLPe97xO_5hw   14m   kubernetes.io/kube-apiserver-client-kubelet   kubelet-bootstrap   Approved,Issued

# 查看加入节点
[root@k8s-m-01 ~]# kubectl get nodes
NAME       STATUS   ROLES    AGE   VERSION
k8s-m-01   Ready    <none>   21h   v1.18.8
k8s-m-02   Ready    <none>   21h   v1.18.8
k8s-m-03   Ready    <none>   21h   v1.18.8
k8s-n-01   Ready    <none>   36s   v1.18.8
k8s-n-02   Ready    <none>   36s   v1.18.8

设置集群角色

[root@k8s-m-01 ~]# kubectl label nodes k8s-m-01 node-role.kubernetes.io/master=k8s-m-01
s.io/node=k8s-n-01
kubectl label nodes k8s-n-02 node-role.kubernetes.io/node=k8s-n-02node/k8s-m-01 labeled
[root@k8s-m-01 ~]# kubectl label nodes k8s-m-02 node-role.kubernetes.io/master=k8s-m-02
node/k8s-m-02 labeled
[root@k8s-m-01 ~]# kubectl label nodes k8s-m-03 node-role.kubernetes.io/master=k8s-m-03
node/k8s-m-03 labeled
[root@k8s-m-01 ~]# 
[root@k8s-m-01 ~]# kubectl label nodes k8s-n-01 node-role.kubernetes.io/node=k8s-n-01
node/k8s-n-01 labeled
[root@k8s-m-01 ~]# kubectl label nodes k8s-n-02 node-role.kubernetes.io/node=k8s-n-02
node/k8s-n-02 labeled
[root@k8s-m-01 ~]# kubectl get nodes
NAME       STATUS     ROLES    AGE    VERSION
k8s-m-01   Ready      master   21h    v1.18.8
k8s-m-02   Ready      master   21h    v1.18.8
k8s-m-03   NotReady   master   21h    v1.18.8
k8s-n-01   Ready      node     4m5s   v1.18.8
k8s-n-02   Ready      node     4m5s   v1.18.8

安装集群图形化界面

# https://github.com/kubernetes/dashboard

posted @ 2021-07-20 16:18 Jeff的技术栈阅读(414) 评论(0) 编辑收藏举报

会员力量，点亮园子希望

刷新页面返回顶部

Jeff的技术栈

生命在于运动，学习在于坚持！！！

k8s-集群部署-证书颁发-二进制部署-注册服务等

kubernetes

二进制部署

节点规划

插件规划

系统优化

安装docker

集群证书

生成根证书

生成根证书请求文件

生成根证书

部署ETCD集群

节点规划

创建ETCD集群证书

生成ETCD证书

分发ETCD证书

部署ETCD

注册ETCD服务

测试ETCD服务

部署master节点

集群规划

创建证书

创建集群CA证书

创建集群普通证书

创建kube-apiserver的证书

创建controller-manager的证书

创建kube-scheduler的证书

创建kube-proxy证书

创建集群管理员证书

颁发证书

编写配置文件以及下载安装包

下载安装包

创建集群配置文件

创建kube-controller-manager.kubeconfig

创建kube-scheduler.kubeconfig

创建kube-proxy.kubeconfig集群配置文件

创建超级管理员的集群配置文件

颁发集群配置文件

创建集群token

部署各个组件

安装kube-apiserver

创建kube-apiserver的配置文件

注册kube-apiserver的服务

对kube-apiserver做高可用

部署TLS

创建集群配置文件

颁发证书

创建TLS低权限用户

部署contorller-manager

编辑配置文件

注册服务

启动

部署kube-scheduler

编写配置文件

注册服务

启动

查看集群状态

部署kubelet服务

创建kubelet服务配置文件

注册kubelet的服务

启动

部署kube-proxy

创建配置文件

注册服务

启动

加入集群节点

查看集群节点加入请求

批准加入

安装网络插件

下载flannel安装包并安装

将flannel配置写入集群数据库

注册flannel服务

修改docker启动文件

启动

验证集群网络

安装集群DNS

验证集群

部署Node节点