k8s集群v1.21.1安装

1. 安装脚本

#!/bin/bash

# 关闭防火墙
systemctl stop firewalld.service
systemctl status firewalld.service
systemctl disable firewalld

#关闭swap
swapoff -a
sed -ri 's/.*swap.*/#&/' /etc/fstab
echo "vm.swappiness = 0" >> /etc/sysctl.conf
sysctl -p

#设置启动参数
cat <<EOF >  /etc/sysctl.d/k8s.conf
net.bridge.bridge-nf-call-ip6tables = 1
net.bridge.bridge-nf-call-iptables = 1
EOF

sysctl --system

#配置docker的yum库
yum -y install yum-utils device-mapper-persistent-data lvm2
yum-config-manager --add-repo https://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

#install docker
yum -y install docker-ce-20.10.6 docker-ce-cli-20.10.6 containerd.io

#修改docker cgroup driver为systemd
mkdir /etc/docker
cat <<EOF > /etc/docker/daemon.json
{
  "exec-opts": ["native.cgroupdriver=systemd"]
}
EOF

#启动docker
systemctl daemon-reload
systemctl restart docker
systemctl enable docker



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=1
repo_gpgcheck=1
gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg
        https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
EOF

# 安装kubectl、kubelet、kubeadm
yum -y makecache

yum -y install kubelet-1.21.1 kubeadm-1.21.1 kubectl-1.21.1

rpm -aq kubelet kubectl kubeadm

systemctl enable kubelet

2. master节点执行脚本

# 只在 master 节点执行
# 替换 x.x.x.x 为 master 节点实际 IP（请使用内网 IP）
# export 命令只在当前 shell 会话中有效，开启新的 shell 窗口后，如果要继续安装过程，请重新执行此处的 export 命令
export MASTER_IP=x.x.x.x
# 替换 apiserver.demo 为 您想要的 dnsName
export APISERVER_NAME=apiserver.demo
# Kubernetes 容器组所在的网段，该网段安装完成后，由 kubernetes 创建，事先并不存在于您的物理网络中
export POD_SUBNET=10.100.0.1/16
echo "${MASTER_IP}    ${APISERVER_NAME}" >> /etc/hosts
curl -sSL https://kuboard.cn/install-script/v1.21.x/init_master.sh | sh -s 1.21.0

3. node节点join集群

3.1 获取token和ca(mater上执行)

kubeadm token create --print-join-command

3.2

# 只在 worker 节点执行
# 替换 x.x.x.x 为 master 节点的内网 IP
export MASTER_IP=x.x.x.x
# 替换 apiserver.demo 为初始化 master 节点时所使用的 APISERVER_NAME
export APISERVER_NAME=apiserver.demo
echo "${MASTER_IP}    ${APISERVER_NAME}" >> /etc/hosts

# 替换为 master 节点上 kubeadm token create 命令的输出
kubeadm join apiserver.demo:6443 --token mpfjma.4vjjg8flqihor4vt     --discovery-token-ca-cert-hash sha256:6f7a8e40a810323672de5eee6f4d19aa2dbdb38411845a1bf5dd63485c43d303

4 安装Ingress Controller

kubectl apply -f https://kuboard.cn/install-script/v1.21.x/nginx-ingress.yaml