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

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.YAML
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.YAML
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 $KUBELET_EXTRA_ARGS
[root@k8s-master01 Bootstrap]# VIM /etc/kubernetes/kubelet-conf.YAML
[root@k8s-master01 Bootstrap]# cat !$
cat /etc/kubernetes/kubelet-conf.YAML
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:

来源: https://www.cnblogs.com/dukuan/p/12104600.html

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