kubernetes实战(三十)：CentOS 8 二进制高可用安装 k8s 1.17.x

1. 基本说明

　　本文章将演示CentOS 8二进制方式安装高可用k8s 1.17.x，相对于其他版本，二进制安装方式并无太大区别。

2. 基本环境配置

　　主机信息

192.168.1.19 k8s-master01
192.168.1.18 k8s-master02
192.168.1.20 k8s-master03
192.168.1.88 k8s-master-lb
192.168.1.21 k8s-node01
192.168.1.22 k8s-node02

　　系统环境

[root@k8s-master01 ~]# cat /etc/redhat-release 
CentOS Linux release 8.0.1905 (Core) 
[root@k8s-master01 ~]# uname -a
Linux k8s-master01 4.18.0-80.el8.x86_64 #1 SMP Tue Jun 4 09:19:46 UTC 2019 x86_64 x86_64 x86_64 GNU/Linux

　　配置所有节点hosts文件

[root@k8s-master01 ~]# cat /etc/hosts
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6

192.168.1.19 k8s-master01
192.168.1.18 k8s-master02
192.168.1.20 k8s-master03 192.168.1.88 k8s-master-lb 192.168.1.21 k8s-node01 192.168.1.22 k8s-node02

　　所有节点关闭firewalld 、dnsmasq、selinux

systemctl disable --now firewalld 
systemctl disable --now dnsmasq
setenforce 0

　　所有节点关闭swap分区

[root@k8s-master01 ~]# swapoff -a && sysctl -w vm.swappiness=0
vm.swappiness = 0

　　所有节点同步时间

ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
echo 'Asia/Shanghai' /etc/timezone
ntpdate time2.aliyun.com

　　Master01节点生成ssh key

[root@k8s-master01 ~]# ssh-keygen -t rsa
Generating public/private rsa key pair.
Enter file in which to save the key (/root/.ssh/id_rsa): 
Created directory '/root/.ssh'.
Enter passphrase (empty for no passphrase): 
Enter same passphrase again: 
Your identification has been saved in /root/.ssh/id_rsa. Your public key has been saved in /root/.ssh/id_rsa.pub. The key fingerprint is: SHA256:6uz2kI+jcMJIUQWKqRcDRbvpVxhCW3Tmqn0NKS+lT3U root@k8s-master01 The key's randomart image is: +---[RSA 2048]----+ |.o++=.o | |.+o+ + | |oo* . . | |. .* + . | |..+ + = S E | |.= o * * . | |. * * B . | | = Bo+ | | .+*oo | +----[SHA256]-----+

　　Master01配置免密码登录其他节点

[root@k8s-master01 ~]# for i in k8s-master01 k8s-master02 k8s-master03 k8s-node01 k8s-node02;do ssh-copy-id -i .ssh/id_rsa.pub $i;done

　　所有节点安装基本工具

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

　　Master01下载安装文件

[root@k8s-master01 ~]# git clone https://github.com/dotbalo/k8s-ha-install.git
Cloning into 'k8s-ha-install'...
remote: Enumerating objects: 12, done.
remote: Counting objects: 100% (12/12), done.
remote: Compressing objects: 100% (11/11), done.
remote: Total 461 (delta 2), reused 5 (delta 1), pack-reused 449
Receiving objects: 100% (461/461), 19.52 MiB | 4.04 MiB/s, done. Resolving deltas: 100% (163/163), done.

　　切换到1.17.x分支

git checkout manual-installation-v1.17.x

3. 基本组件安装

　　配置Docker yum源（和1.16.x安装步骤一致）

[root@k8s-master01 k8s-ha-install]# curl  https://download.docker.com/linux/centos/docker-ce.repo -o /etc/yum.repos.d/docker-ce.repo
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
100  2424  100  2424    0     0   3639      0 --:--:-- --:--:-- --:--:--  3645
[root@k8s-master01 k8s-ha-install]# yum makecache
CentOS-8 - AppStream                                                                                                                                                             559 kB/s | 6.3 MB     00:11    
CentOS-8 - Base                                                                                                                                                                  454 kB/s | 7.9 MB     00:17    
CentOS-8 - Extras                                                                                                                                                                592  B/s | 2.1 kB     00:03 Docker CE Stable - x86_64 5.8 kB/s | 20 kB 00:03 Last metadata expiration check: 0:00:01 ago on Sat 02 Nov 2019 02:46:29 PM CST. Metadata cache created.

　　所有节点安装新版containerd

[root@k8s-master01 k8s-ha-install]# wget https://download.docker.com/linux/centos/7/x86_64/edge/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
--2019-11-02 15:00:20--  https://download.docker.com/linux/centos/7/x86_64/edge/Packages/containerd.io-1.2.6-3.3.el7.x86_64.rpm
Resolving download.docker.com (download.docker.com)... 13.225.103.32, 13.225.103.65, 13.225.103.10, ...
Connecting to download.docker.com (download.docker.com)|13.225.103.32|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 27119348 (26M) [binary/octet-stream]
Saving to: ‘containerd.io-1.2.6-3.3.el7.x86_64.rpm’

containerd.io-1.2.6-3.3.el7.x86_64.rpm               100%[===================================================================================================================]  25.86M  1.55MB/s    in 30s 2019-11-02 15:00:51 (887 KB/s) - ‘containerd.io-1.2.6-3.3.el7.x86_64.rpm’ saved [27119348/27119348] [root@k8s-master01 k8s-ha-install]# yum -y install containerd.io-1.2.6-3.3.el7.x86_64.rpm Last metadata expiration check: 0:14:35 ago on Sat 02 Nov 2019 02:46:29 PM CST.

　　所有节点安装最新版Docker

[root@k8s-master01 k8s-ha-install]# yum install docker-ce -y

　　所有节点开启Docker并设置开机自启动

[root@k8s-master01 k8s-ha-install]# systemctl enable --now docker
Created symlink /etc/systemd/system/multi-user.target.wants/docker.service → /usr/lib/systemd/system/docker.service.
[root@k8s-master01 k8s-ha-install]# docker version
Client: Docker Engine - Community
 Version:           19.03.4
 API version:       1.40 Go version: go1.12.10 Git commit: 9013bf583a Built: Fri Oct 18 15:52:22 2019 OS/Arch: linux/amd64 Experimental: false Server: Docker Engine - Community Engine: Version: 19.03.4 API version: 1.40 (minimum version 1.12) Go version: go1.12.10 Git commit: 9013bf583a Built: Fri Oct 18 15:50:54 2019 OS/Arch: linux/amd64 Experimental: false containerd: Version: 1.2.6 GitCommit: 894b81a4b802e4eb2a91d1ce216b8817763c29fb runc: Version: 1.0.0-rc8 GitCommit: 425e105d5a03fabd737a126ad93d62a9eeede87f docker-init: Version: 0.18.0 GitCommit: fec3683

4. k8s组件安装

　　下载kubernetes 1.17.x安装包

[root@k8s-master01 ~]# wget https://storage.googleapis.com/kubernetes-release/release/v1.17.0/kubernetes-server-linux-amd64.tar.gz

　　下载etcd 3.3.18安装包

[root@k8s-master01 ~]# wget https://github.com/etcd-io/etcd/releases/download/v3.3.18/etcd-v3.3.18-linux-amd64.tar.gz

　　解压kubernetes安装文件

[root@k8s-master01 ~]# tar -xf kubernetes-server-linux-amd64.tar.gz  --strip-components=3 -C /usr/local/bin kubernetes/server/bin/kube{let,ctl,-apiserver,-controller-manager,-scheduler,-proxy}

　　解压etcd安装文件

[root@k8s-master01 ~]#  tar -zxvf etcd-v3.3.18-linux-amd64.tar.gz --strip-components=1 -C /usr/local/bin etcd-v3.3.18-linux-amd64/etcd{,ctl}

　　版本查看

[root@k8s-master01 ~]# kubectl version
Client Version: version.Info{Major:"1", Minor:"17", GitVersion:"v1.17.0", GitCommit:"70132b0f130acc0bed193d9ba59dd186f0e634cf", GitTreeState:"clean", BuildDate:"2019-12-07T21:20:10Z", GoVersion:"go1.13.4", Compiler:"gc", Platform:"linux/amd64"}
The connection to the server localhost:8080 was refused - did you specify the right host or port?
[root@k8s-master01 ~]# etcdctl -v
etcdctl version: 3.3.18
API version: 2

　　将组件发送到其他节点

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

　　CNI安装，下载CNI组件

wget  https://github.com/containernetworking/plugins/releases/download/v0.7.5/cni-plugins-amd64-v0.7.5.tgz

　　所有节点创建/opt/cni/bin目录

mkdir -p /opt/cni/bin

　　解压cni并发送至其他节点

tar -zxf cni-plugins-amd64-v0.7.5.tgz -C /opt/cni/bin
for NODE in $MasterNodes; do     ssh $NODE 'mkdir -p /opt/cni/bin';     scp /opt/cni/bin/* $NODE:/opt/cni/bin/; done
for NODE in $WorkNodes; do     ssh $NODE 'mkdir -p /opt/cni/bin';     scp /opt/cni/bin/* $NODE:/opt/cni/bin/; done

5. 生成证书

　　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

　　所有Master节点创建etcd证书目录

mkdir /etc/etcd/ssl -p

　　Master01节点生成etcd证书

[root@k8s-master01 pki]# pwd
/root/k8s-ha-install/pki

[root@k8s-master01 pki]#  cfssl gencert -initca etcd-ca-csr.json | cfssljson -bare /etc/etcd/ssl/etcd-ca
 [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-master03,192.168.1.19,192.168.1.18,192.168.1.20 \
 -profile=kubernetes \ etcd-csr.json | cfssljson -bare /etc/etcd/ssl/etcd

2019/12/26 22:48:00 [INFO] generate received request
2019/12/26 22:48:00 [INFO] received CSR
2019/12/26 22:48:00 [INFO] generating key: rsa-2048
2019/12/26 22:48:01 [INFO] encoded CSR
2019/12/26 22:48:01 [INFO] signed certificate with serial number 250230878926052708909595617022917808304837732033

　　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]# 
[root@k8s-master01 pki]# 
[root@k8s-master01 pki]# 
[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 etcd-ca-key.pem 100% 1675 424.0KB/s 00:00 etcd-ca.pem 100% 1363 334.4KB/s 00:00 etcd-key.pem 100% 1679 457.4KB/s 00:00 etcd.pem 100% 1505 254.5KB/s 00:00 etcd-ca-key.pem 100% 1675 308.3KB/s 00:00 etcd-ca.pem 100% 1363 479.0KB/s 00:00 etcd-key.pem 100% 1679 208.1KB/s 00:00 etcd.pem 100% 1505 398.1KB/s 00:00

　　生成kubernetes证书

　　所有节点创建kubernetes相关目录

mkdir -p /etc/kubernetes/pki

[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=10.96.0.1,192.168.1.88,127.0.0.1,kubernetes,kubernetes.default,kubernetes.default.svc,kubernetes.default.svc.cluster,kubernetes.default.svc.cluster.local,192.168.1.19,192.168.1.18,192.168.1.20 -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]# [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://192.168.1.88:8443 \ --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://192.168.1.88:8443 \ --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://192.168.1.88:8443 --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". [root@k8s-master01 pki]# for NODE in k8s-master01 k8s-master02 k8s-master03; do \cp kubelet-csr.json kubelet-$NODE-csr.json; sed -i "s/\$NODE/$NODE/g" kubelet-$NODE-csr.json;  cfssl gencert \ -ca=/etc/kubernetes/pki/ca.pem \ -ca-key=/etc/kubernetes/pki/ca-key.pem \ -config=ca-config.json \ -hostname=$NODE \ -profile=kubernetes \ kubelet-$NODE-csr.json | cfssljson -bare /etc/kubernetes/pki/kubelet-$NODE; rm -f kubelet-$NODE-csr.json done  [root@k8s-master01 pki]# for NODE in k8s-master01 k8s-master02 k8s-master03; do ssh $NODE "mkdir -p /etc/kubernetes/pki" scp /etc/kubernetes/pki/ca.pem $NODE:/etc/kubernetes/pki/ca.pem scp /etc/kubernetes/pki/kubelet-$NODE-key.pem $NODE:/etc/kubernetes/pki/kubelet-key.pem scp /etc/kubernetes/pki/kubelet-$NODE.pem $NODE:/etc/kubernetes/pki/kubelet.pem rm -f /etc/kubernetes/pki/kubelet-$NODE-key.pem /etc/kubernetes/pki/kubelet-$NODE.pem done  [root@k8s-master01 pki]# for NODE in k8s-master01 k8s-master02 k8s-master03; do ssh $NODE "cd /etc/kubernetes/pki && \ kubectl config set-cluster kubernetes \ --certificate-authority=/etc/kubernetes/pki/ca.pem \ --embed-certs=true \ --server=https://192.168.1.88:8443 \ --kubeconfig=/etc/kubernetes/kubelet.kubeconfig && \ kubectl config set-credentials system:node:${NODE} \ --client-certificate=/etc/kubernetes/pki/kubelet.pem \ --client-key=/etc/kubernetes/pki/kubelet-key.pem \ --embed-certs=true \ --kubeconfig=/etc/kubernetes/kubelet.kubeconfig && \ kubectl config set-context system:node:${NODE}@kubernetes \ --cluster=kubernetes \ --user=system:node:${NODE} \ --kubeconfig=/etc/kubernetes/kubelet.kubeconfig && \ kubectl config use-context system:node:${NODE}@kubernetes \ --kubeconfig=/etc/kubernetes/kubelet.kubeconfig" done

　　创建ServiceAccount Key

[root@k8s-master01 pki]#  openssl genrsa -out /etc/kubernetes/pki/sa.key 2048
Generating RSA private key, 2048 bit long modulus (2 primes)
...................................................................................+++++
...............+++++
e is 65537 (0x010001)
[root@k8s-master01 pki]# openssl rsa -in /etc/kubernetes/pki/sa.key -pubout -out /etc/kubernetes/pki/sa.pub writing RSA key

 [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
scp /etc/kubernetes/${FILE} $NODE:/etc/kubernetes/${FILE};
done;
done

6. 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

# 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://192.168.1.19:2380' listen-client-urls: 'https://192.168.1.19:2379,http://127.0.0.1:2379' max-snapshots: 3 max-wals: 5 cors: initial-advertise-peer-urls: 'https://192.168.1.19:2380' advertise-client-urls: 'https://192.168.1.19:2379' discovery: discovery-fallback: 'proxy' discovery-proxy: discovery-srv: initial-cluster: 'k8s-master01=https://192.168.1.19:2380,k8s-master02=https://192.168.1.18:2380,k8s-master03=https://192.168.1.20:2380' 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: ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem' 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: ca-file: '/etc/kubernetes/pki/etcd/etcd-ca.pem' 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-output: default force-new-cluster: false

　　所有Master节点创建etcd service并启动

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

　　高可用配置

　　所有Master节点安装keepalived和haproxy

yum install keepalived haproxy -y

　　HAProxy配置

[root@k8s-master01 pki]# 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 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 k8s-master01 192.168.1.19:6443 check server k8s-master02 192.168.1.18:6443 check server k8s-master03 192.168.1.20:6443 check

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

! Configuration File for keepalived
global_defs {
    router_id LVS_DEVEL
}
vrrp_script chk_apiserver {
    script "/etc/keepalived/check_apiserver.sh"
    interval 2
    weight -5
    fall 3  
    rise 2 } vrrp_instance VI_1 { state MASTER interface ens160 mcast_src_ip 192.168.1.19 virtual_router_id 51 priority 100 advert_int 2 authentication { auth_type PASS auth_pass K8SHA_KA_AUTH } virtual_ipaddress { 192.168.1.88 } track_script {
 chk_apiserver

} }

　　健康检查配置

[root@k8s-master01 keepalived]# cat /etc/keepalived/check_apiserver.sh 
#!/bin/bash

err=0
for k in $(seq 1 5)
do
    check_code=$(pgrep kube-apiserver)
    if [[ $check_code == "" ]]; then err=$(expr $err + 1) sleep 5 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

　　启动HAProxy和KeepAlived

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

　　VIP测试

[root@k8s-master01 pki]# ping 192.168.1.88
PING 192.168.1.88 (192.168.1.88) 56(84) bytes of data.
64 bytes from 192.168.1.88: icmp_seq=1 ttl=64 time=1.39 ms
64 bytes from 192.168.1.88: icmp_seq=2 ttl=64 time=2.46 ms
64 bytes from 192.168.1.88: icmp_seq=3 ttl=64 time=1.68 ms
64 bytes from 192.168.1.88: icmp_seq=4 ttl=64 time=1.08 ms

　　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=192.168.1.88 \ --service-cluster-ip-range=10.96.0.0/12 \ --service-node-port-range=30000-32767 \ --etcd-servers=https://192.168.1.19:2379,https://192.168.1.18:2379,https://192.168.1.20:2379 \ --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

[root@k8s-master01 pki]# vim /etc/kubernetes/token.csv 
[root@k8s-master01 pki]# cat !$
cat /etc/kubernetes/token.csv
d7d356746b508a1a478e49968fba7947,kubelet-bootstrap,10001,"system:kubelet-bootstrap"

　　所有Master节点开启kube-apiserver

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

　　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.

7. TLS Bootstrapping配置

　　在Master01创建bootstrap

kubectl config set-cluster kubernetes     --certificate-authority=/etc/kubernetes/pki/ca.pem     --embed-certs=true     --server=https://192.168.1.88:8443     --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

[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

8. Node节点配置

　　复制证书至Node节点

[root@k8s-master01 bootstrap]# for NODE in 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

etcd-ca.pem                                                                                                                                                                    100% 1363   314.0KB/s   00:00    
etcd.pem                                                                                                                                                                       100% 1505   429.1KB/s   00:00    
etcd-key.pem                                                                                                                                                                   100% 1679   361.9KB/s   00:00 ca.pem 100% 1407 459.5KB/s 00:00 ca-key.pem 100% 1679 475.2KB/s 00:00 front-proxy-ca.pem 100% 1143 214.5KB/s 00:00 bootstrap-kubelet.kubeconfig 100% 2291 695.1KB/s 00:00 etcd-ca.pem 100% 1363 325.5KB/s 00:00 etcd.pem 100% 1505 301.2KB/s 00:00 etcd-key.pem 100% 1679 260.9KB/s 00:00 ca.pem 100% 1407 420.8KB/s 00:00 ca-key.pem 100% 1679 398.0KB/s 00:00 front-proxy-ca.pem 100% 1143 224.9KB/s 00:00 bootstrap-kubelet.kubeconfig 100% 2291 685.4KB/s 00:00

　　所有Node节点创建相关目录

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
[root@k8s-master01 bootstrap]# cat !$
cat /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
[root@k8s-master01 bootstrap]# cat !$
cat /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
[root@k8s-master01 bootstrap]# cat !$
cat /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: cgroupfs 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

　　查看集群状态

　　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/$SECRET \
--output=jsonpath='{.data.token}' | base64 -d) PKI_DIR=/etc/kubernetes/pki K8S_DIR=/etc/kubernetes kubectl config set-cluster kubernetes --certificate-authority=/etc/kubernetes/pki/ca.pem --embed-certs=true --server=https://192.168.1.88:8443 --kubeconfig=${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.

9. 安装calico

　　安装Calico 3.11.1

[root@k8s-master01 Calico]# cd /root/k8s-ha-install/Calico/

[root@k8s-master01 Calico]# kubectl create -f calico.yaml 
configmap/calico-config created
customresourcedefinition.apiextensions.k8s.io/felixconfigurations.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/ipamblocks.crd.projectcalico.org created
customresourcedefinition.apiextensions.k8s.io/blockaffinities.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipamhandles.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ipamconfigs.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/bgppeers.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/bgpconfigurations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/ippools.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/hostendpoints.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/clusterinformations.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/globalnetworkpolicies.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/globalnetworksets.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/networkpolicies.crd.projectcalico.org created customresourcedefinition.apiextensions.k8s.io/networksets.crd.projectcalico.org created clusterrole.rbac.authorization.k8s.io/calico-kube-controllers created clusterrolebinding.rbac.authorization.k8s.io/calico-kube-controllers created clusterrole.rbac.authorization.k8s.io/calico-node created clusterrolebinding.rbac.authorization.k8s.io/calico-node created daemonset.apps/calico-node created serviceaccount/calico-node created deployment.apps/calico-kube-controllers created serviceaccount/calico-kube-controllers created

　　查看Calico状态

[root@k8s-master01 Calico]# kubectl get po -n kube-system -owide
NAME                                       READY   STATUS    RESTARTS   AGE   IP              NODE           NOMINATED NODE   READINESS GATES
calico-kube-controllers-648f4868b8-pvz8k   1/1     Running   0          61s   10.244.85.193   k8s-node01     <none>           <none>
calico-node-54fdt                          1/1     Running   0          61s   192.168.1.20    k8s-master03   <none>           <none>
calico-node-7f9vj                          1/1     Running   0          61s   192.168.1.18    k8s-master02   <none>           <none>
calico-node-msctk                          1/1     Running   0          61s   192.168.1.19    k8s-master01   <none>           <none>
calico-node-rbxcr                          1/1     Running   0          61s   192.168.1.22    k8s-node02     <none>           <none> calico-node-s5mb4 1/1 Running 0 61s 192.168.1.21 k8s-node01 <none> <none> [root@k8s-master01 Calico]# kubectl get node NAME STATUS ROLES AGE VERSION k8s-master01 Ready <none> 23h v1.17.0 k8s-master02 Ready <none> 23h v1.17.0 k8s-master03 Ready <none> 23h v1.17.0 k8s-node01 Ready <none> 23h v1.17.0 k8s-node02 Ready <none> 23h v1.17.0 [root@k8s-master01 Calico]# kubectl cluster-info Kubernetes master is running at https://192.168.1.88:8443

10、安装CoreDNS

[root@k8s-master01 Calico]# cd /root/k8s-ha-install/CoreDNS/
[root@k8s-master01 CoreDNS]# kubectl create -f coredns.yaml 
serviceaccount/coredns created
clusterrole.rbac.authorization.k8s.io/system:coredns created
clusterrolebinding.rbac.authorization.k8s.io/system:coredns created
configmap/coredns created deployment.apps/coredns created service/kube-dns created

　　查看状态

[root@k8s-master01 CoreDNS]# kubectl get po -n kube-system
NAME                                       READY   STATUS    RESTARTS   AGE
calico-kube-controllers-648f4868b8-pvz8k   1/1     Running   0          2m25s
calico-node-54fdt                          1/1     Running   0          2m25s
calico-node-7f9vj                          1/1     Running   0          2m25s
calico-node-msctk                          1/1     Running   0          2m25s
calico-node-rbxcr                          1/1     Running   0 2m25s calico-node-s5mb4 1/1 Running 0 2m25s coredns-76b74f549-7znbw 1/1 Running 0 30s [root@k8s-master01 CoreDNS]# kubectl logs -f coredns-76b74f549-7znbw -n kube-system .:53 [INFO] plugin/reload: Running configuration MD5 = 8b19e11d5b2a72fb8e63383b064116a1 CoreDNS-1.6.6 linux/amd64, go1.13.5, 6a7a75e

11、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

　　验证解析

[root@k8s-master01 CoreDNS]# 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

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

　　至此集群安装完毕，其他组件可以参考本博客其他版本安装的文档。

　　参考《再也不踩坑的Kubernetes实战指南》

赞助作者一杯奶茶:

kubernetes实战(三十)：CentOS 8 二进制 高可用 安装 k8s 1.17.x

猜你喜欢

kubernetes实战(三十)：CentOS 8 二进制高可用安装 k8s 1.17.x