输入下面脚本可一键搭建 k8s 集群
目前只适用于 centos 和 readhat，其它系统如果有需求可以留言。
bash <(curl -sL https://fastyw.com/wp-content/uploads/2022/12/k8s.sh)脚本源代码
#!/bin/bash
# Author: 有人说我白
RED="\033[31m" # Error message
GREEN="\033[32m" # Success message
YELLOW="\033[33m" # Warning message
BLUE="\033[36m" # Info message
PLAIN='\033[0m'
colorEcho() {echo -e "${1}${@:2}${PLAIN}"
}
checkSystem() {result=$(id | awk '{print $1}')
if [[ $result != "uid=0(root)" ]]; then
colorEcho $RED "请以 root 身份执行该脚本"
exit 1
fi
res=`which yum 2>/dev/null`
if [[ "$?" != "0" ]]; then
res=`which apt 2>/dev/null`
if [[ "$?" != "0" ]]; then
colorEcho $RED "不受支持的 Linux 系统"
exit 1
fi
PMT="apt"
CMD_INSTALL="apt install -y"
CMD_REMOVE="apt remove -y"
CMD_UPGRADE="apt update && apt upgrade -y; apt autoremove -y"
else
PMT="yum"
CMD_INSTALL="yum install -y"
CMD_REMOVE="yum remove -y"
CMD_UPGRADE="yum update -y"
fi
if [[ $PMT == "apt" ]];then
colorEcho $RED "不受支持的 Linux 系统"
exit 1
fi
res=`which systemctl 2>/dev/null`
if [[ "$?" != "0" ]]; then
colorEcho $RED "系统版本过低，请升级到最新版本"
exit 1
fi
}
preinstall() {
hostnamectl set-hostname $ROLE-$HOSTNAME
#$PMT clean all
[[ "$PMT" = "apt" ]] && $PMT update
#echo $CMD_UPGRADE | bash
echo ""colorEcho $BLUE" 安装必要软件 "if [["$PMT"="yum" ]]; then
$CMD_INSTALL epel-release
fi
$CMD_INSTALL curl vim docker
res=`which curl 2>/dev/null`
[[ "$?" != "0" ]] && $CMD_INSTALL curl
res=`which docker 2>/dev/null`
[[ "$?" != "0" ]] && $CMD_INSTALL docker
systemctl enable --now docker
colorEcho $BLUE "配置服务器环境"
if [[ -s /etc/selinux/config ]] && grep 'SELINUX=enforcing' /etc/selinux/config; then
sed -i 's/SELINUX=enforcing/SELINUX=permissive/g' /etc/selinux/config
setenforce 0
fi
echo 1 > /proc/sys/net/ipv4/ip_forward
echo 1 > /proc/sys/net/bridge/bridge-nf-call-iptables
echo 'net.ipv4.ip_forward = 1' >> /etc/sysctl.conf
sysctl -p
swapoff -a
}
installk8s(){
cat <<EOF > /etc/yum.repos.d/kubernetes.repo
[kubernetes]
name=Kubernetes
baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64/
enabled=1
gpgcheck=0
repo_gpgcheck=0
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF
colorEcho $BLUE '安装 k8s 组件'
$CMD_INSTALL --nogpgcheck kubelet-1.23.5-0 kubeadm-1.23.5-0 kubectl-1.23.5-0
systemctl enable --now kubelet
}
getip(){
colorEcho $BLUE "请选择获取本机 ip/vip 的方式："
echo "1) 网络获取"
echo "2) 手动输入"
read -p "请选择获取本机 ip/vip 的方式 (默认联网获取)：" answer
if [[ -z "$answer" ]]; then
METHOD="network"
else
case $answer in
1)
METHOD="network"
;;
2)
METHOD="matual"
;;
*)
colorEcho $RED "无效的选择，使用默认角色"
METHOD="network"
esac
fi
echo ""colorEcho $BLUE" 获取本机 ip/vip 的方式：$METHOD"if [[ $METHOD =='network' ]];then
ip=`curl -s icanhazip.com`
else
read -p "请输入本机 ip/vip：" ip
fi
colorEcho $YELLOW "本机 ip/vip 地址为: $ip"
read -p '确认安装请按回车键 (CTRL+ C 退出脚本)' a
}
init(){
cat <<-EOF >/root/kubeadm_init.yaml
apiVersion: kubeadm.k8s.io/v1beta3
kind: ClusterConfiguration
kubernetesVersion: v1.23.5
apiServer:
certSANs:
- "$ip"
controlPlaneEndpoint: "$ip:6443"
networking:
podSubnet: 10.244.0.0/16
imageRepository: registry.cn-hangzhou.aliyuncs.com/google_containers
EOF
kubeadm init --config=/root/kubeadm_init.yaml|tee /root/kubeinit.log
mkdir -p $HOME/.kube
cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
chown $(id -u):$(id -g) $HOME/.kube/config
kubectl apply -f https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml
colorEcho $GREEN 'k8s 安装完成'
}
greplog(){
colorEcho $RED "关键命令，请注意保存"
colorEcho $BLUE "如需部署集群"
colorEcho $BLUE "请在其他 master 节点中执行下面命令"
echo ` grep -E -B 2 '\\-\\-control\-plane' /root/kubeinit.log|sed 's/\\\\//g'`
colorEcho $BLUE "请在其他 node 节点执行完脚本后执行下面命令"
echo `grep -E -B 2 '\\-\\-control\-plane' /root/kubeinit.log |grep -v control|sed 's/\\\\//g'`
}
menu(){
checkSystem
colorEcho $BLUE "请选择本机的角色："
echo "1)master"
echo "2)node"
read -p "请选择 k8s 角色（默认 master）" answer
if [[ -z "$answer" ]]; then
ROLE="master"
else
case $answer in
1)
ROLE="master"
;;
2)
ROLE="node"
;;
*)
colorEcho $RED "无效的选择，使用默认角色"
ROLE="master"
esac
fi
echo ""colorEcho $BLUE" 当前 k8s 角色：$ROLE"if [[ $ROLE =='master' ]];then
colorEcho $BLUE "检测到您设置的角色为 master，请选择行为："
echo "1) 建立新集群"
echo "2) 加入旧集群"
read -p "请选择 master 节点行为（默认建立新集群）" answer
if [[ -z "$answer" ]]; then
ACTION="new"
else
case $answer in
1)
ACTION="new"
;;
2)
ACTION="old"
;;
*)
colorEcho $RED "无效的选择，使用默认行为"
ACTION="new"
esac
fi
echo ""colorEcho $BLUE" 当前 k8s 节点行为：$ACTION"if [[ $ACTION =="new" ]];then
getip
preinstall
installk8s
init
greplog
else
preinstall
installk8s
colorEcho $BLUE "master 节点安装完成，请在主 master 节点日志中拿取命令加入主节点"
fi
else
preinstall
installk8s
colorEcho $BLUE "node 节点安装完成，请在主 master 节点日志中拿取命令加入主节点"
fi
}
main(){menu}
main正文完