Centos7 kubeadm安装k8s

安装环境准备

关闭防火墙
systemctl stop firewalld
systemctl disable firewalld

关闭selinux
sed -i 's/enforcing/disabled/' /etc/selinux/config

关闭swap
sed -ri 's/.*swap.*/#&/' /etc/fstab

将桥接的 IPv4 流量传递到 iptables 的链
cat <<EOF >>/etc/sysctl.conf
> net.bridge.bridge-nf-call-iptables = 1
> net.bridge.bridge-nf-call-ip6tables = 1
> EOF
sysctl --system

设置主机名字
hostnamectl set-hostname k8smaster
hostnamectl set-hostname k8snode1
hostnamectl set-hostname k8snode2

在master添加hosts
cat <<EOF >>/etc/hosts
> 192.168.184.151 k8smaster
> 192.168.184.152 k8snode1
> 192.168.184.153 k8snode2
> EOF

安装docker
安装完成后修改Cgroup Driver
/etc/docker/daemon.json
新增
"exec-opts": ["native.cgroupdriver=systemd"]
systemctl daemon-reload
systemctl restart docker

安装 kubeadm、kubelet 和 kubectl

阿里云镜像
yum install -y --nogpgcheck kubelet-1.22.5 kubeadm-1.22.5 kubectl-1.22.5
systemctl enable kubelet && systemctl start kubelet

安装需要的镜像

kubeadm config images list --kubernetes-version v1.22.5
k8s.gcr.io/kube-apiserver:v1.22.5
k8s.gcr.io/kube-controller-manager:v1.22.5
k8s.gcr.io/kube-scheduler:v1.22.5
k8s.gcr.io/kube-proxy:v1.22.5
k8s.gcr.io/pause:3.5
k8s.gcr.io/etcd:3.5.0-0
k8s.gcr.io/coredns/coredns:v1.8.4

用kubeadm来初始化集群（仅master节点执行）

kubeadm init \
  --apiserver-advertise-address=192.168.184.151 \
  --kubernetes-version v1.22.5 \
  --service-cidr=10.96.0.0/12 \
  --pod-network-cidr=10.244.0.0/16 \
  --ignore-preflight-errors=all

如果出现
Your Kubernetes control-plane has initialized successfully!
说明初始化成功
会得到一段kubeadm join node节点用来加入master

根据提示

node节点用来加入master后
通过kubectl get nodes查看节点

节点都是NotReady，需要安装一个网络插件，他们才能工作

安装网络插件Calico后