初始化master節點與worker節點
初始化腳本 init.sh
#!/bin/bash
# 在 master 節點和 worker 節點都要執行
# 安裝 docker
# 參考文檔如下
# https://docs.docker.com/install/linux/docker-ce/centos/
# https://docs.docker.com/install/linux/linux-postinstall/
# 卸載舊版本
yum remove -y docker \\\\
docker-client \\\\
docker-client-latest \\\\
docker-common \\\\
docker-latest \\\\
docker-latest-logrotate \\\\
docker-logrotate \\\\
docker-selinux \\\\
docker-engine-selinux \\\\
docker-engine
# 設置 yum repository
yum install -y yum-utils \\\\
device-mapper-persistent-data \\\\
lvm2
yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
# 安裝并啟動 docker
yum install -y docker-ce-18.09.7 docker-ce-cli-18.09.7 containerd.io
systemctl enable docker
systemctl start docker
# 安裝 nfs-utils
# 必須先安裝 nfs-utils 才能掛載 nfs 網絡存儲
yum install -y nfs-utils
# 關閉 防火墻
systemctl stop firewalld
systemctl disable firewalld
# 關閉 SeLinux
setenforce 0
sed -i s/SELINUX=enforcing/SELINUX=disabled/g /etc/selinux/config
# 關閉 swap
swapoff -a
yes | cp /etc/fstab /etc/fstab_bak
cat /etc/fstab_bak |grep -v swap > /etc/fstab
# 修改 /etc/sysctl.conf
# 如果有配置，則修改
sed -i s#^net.ipv4.ip_forward.*#net.ipv4.ip_forward=1#g /etc/sysctl.conf
sed -i s#^net.bridge.bridge-nf-call-ip6tables.*#net.bridge.bridge-nf-call-ip6tables=1#g /etc/sysctl.conf
sed -i s#^net.bridge.bridge-nf-call-iptables.*#net.bridge.bridge-nf-call-iptables=1#g /etc/sysctl.conf
# 可能沒有，追加
echo net.ipv4.ip_forward = 1 >> /etc/sysctl.conf
echo net.bridge.bridge-nf-call-ip6tables = 1 >> /etc/sysctl.conf
echo net.bridge.bridge-nf-call-iptables = 1 >> /etc/sysctl.conf
# 執行命令以應用
sysctl -p
# 配置K8S的yum源
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=http://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=http://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
http://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
# 卸載舊版本
yum remove -y kubelet kubeadm kubectl
# 安裝kubelet、kubeadm、kubectl
yum install -y kubelet-1.16.0 kubeadm-1.16.0 kubectl-1.16.0
# 修改docker Cgroup Driver為systemd
# # 將/usr/lib/systemd/system/docker.service文件中的這一行 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock
# # 修改為 ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --exec-opt native.cgroupdriver=systemd
# 如果不修改，在添加 worker 節點時可能會碰到如下錯誤
# [WARNING IsDockerSystemdCheck]: detected cgroupfs as the Docker cgroup driver. The recommended driver is systemd.
# Please follow the guide at https://kubernetes.io/docs/setup/cri/
sed -i s#^ExecStart=/usr/bin/dockerd.*#ExecStart=/usr/bin/dockerd -H fd:// --containerd=/run/containerd/containerd.sock --exec-opt native.cgroupdriver=systemd#g /usr/lib/systemd/system/docker.service
# 設置 docker 鏡像，提高 docker 鏡像下載速度和穩定性
# 如果您訪問 https://hub.docker.io 速度非常穩定，亦可以跳過這個步驟
curl -sSL https://get.daocloud.io/daotools/set_mirror.sh | sh -s http://f1361db2.m.daocloud.io
# 重啟 docker，并啟動 kubelet
systemctl daemon-reload
systemctl restart docker
systemctl enable kubelet && systemctl start kubelet
docker versionSealos
# 下載sealos
wget https://github.com/fanux/sealos/releases/download/v2.0.7/sealos
# 加執行權限，并將sealos移至/usr/bin下
chmod x sealos && mv sealos /usr/binsealos選項
--master master服務器地址列表
--node node服務器地址列表
--user 服務器ssh用戶名
--passwd 服務器ssh用戶密碼
--pkg-url 離線包位置，可以放在本地目錄，也可以放在一個http服務器上，sealos會wget到安裝目標機
--version kubernetes版本初始化k8s HA集群
sealos init --passwd YOUR_SERVER_PASSWD
--master 172.31.194.114 --master 172.31.194.116 --master 172.31.194.115 \\\\
--node 172.31.194.117 \\\\
--pkg-url https://sealyun.oss-cn-beijing.aliyuncs.com/37374d999dbadb788ef0461844a70151-1.16.0/kube1.16.0.tar.gz \\\\
--version v1.16.0執行完成后shell最后一行輸出如下說明集群部署成功
2019-11-07 17:30:20 [INFO] [github.com/fanux/sealos/install/print.go:25] sealos install success.我們來獲取一下節點的狀態
[root@master01 ~]# kubectl get nodes
NAME STATUS ROLES AGE VERSION
master01 Ready master 11h v1.16.0
master02 Ready master 11h v1.16.0
master03 Ready master 11h v1.16.0
node01 Ready <none> 11h v1.16.0# 獲取service
[root@master01 ~]# kubectl get svc
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 17h
# 通過查看 ipvs 規則，我們可以看到發送至 10.96.0.1 的請求都被負載至所有master節點。
[root@master01 ~]# ipvsadm -Ln
IP Virtual Server version 1.2.1 (size=4096)
Prot LocalAddress:Port Scheduler Flags
-> RemoteAddress:Port Forward Weight ActiveConn InActConn
TCP 10.96.0.1:443 rr
-> 172.31.194.114:6443 Masq 1 3 0
-> 172.31.194.115:6443 Masq 1 2 0
-> 172.31.194.116:6443 Masq 1 0 0 更多關于云服務器，域名注冊，虛擬主機的問題，請訪問三五互聯官網：m.shinetop.cn