CentOS 7 部署 K8S

 

基础：

三台2核2G虚拟机

CentOS 7

192.168.5.101

192.168.5.102

192.168.5.103

 

 

一、基础配置(所有节点都关闭)

 

1、关闭防火墙、selinux、SWAP

systemctl stop firewalld && systemctl disable firewalld && setenforce 0

sed -i 's/^SELINUX=.*/SELINUX=disabled/' /etc/selinux/config

swapoff -a

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

 

2、内核开启网络支持

cat <<EOF > /etc/sysctl.d/k8s.conf

net.bridge.bridge-nf-call-ip6tables = 1

net.bridge.bridge-nf-call-iptables = 1

EOF

sysctl -p /etc/sysctl.conf

 

3、设置 /etc/hosts

192.168.5.101 node101

192.168.5.102 node102

192.168.5.103 node103

 

 

二、Docker部署

 

1、安装依赖与镜像

yum install -y yum-utils

 

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

 

2、安装软件包

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

 

#默认安装最新版本，可以指定安装版本

#查看可以安装哪些版本

yum list docker-ce --showduplicates|sort -r

yum install -y docker-ce-18.09.9-3.el7 docker-ce-cli-18.09.9-3.el7 containerd.io

 

3、启动Docker

systemctl enable docker && systemctl start docker

 

4、修改Cgroup Driver

cat > /etc/docker/daemon.json <<EOF

{ "exec-opts": ["native.cgroupdriver=systemd"] }

EOF

 

systemctl restart docker

注意：Docker默认驱动是cgroupfs，由于k8s推荐是systemd，需要修改

 

 

三、安装kubeadm部署K8S集群

 

#k8s阿里云镜像

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

 

#安装指定版本

yum list kubelet --showduplicates | sort -r

yum install -y kubelet-1.18.20 kubeadm-1.18.20 kubectl-1.18.20

 

systemctl enable kubelet && systemctl start kubelet

 

 

#初始化Master节点

cat <<EOF > kubeadm.yaml
apiVersion: kubeadm.k8s.io/v1beta2
kind: InitConfiguration
nodeRegistration:
  KubeletExtraArgs:
    cgroup-driver: "systemd"
---
apiVersion: kubeadm.k8s.io/v1beta2
kind: ClusterConfiguration
kubernetesVersion: v1.18.20
clusterName: "kubernetes"
controllerManager:
  extraArgs:
    horizontal-pod-autoscaler-sync-period: "10s"
    node-monitor-grace-period: "10s"
apiServer:
 extraArgs:
   runtime-config: "api/all=true"
networking:
  podSubnet: "172.36.0.0/16"
  serviceSubnet: 10.96.0.0/12
imageRepository: k8s.gcr.io
scheduler: {}
EOF

 

kubeadm init --config kubeadm.yaml

 

 

四、安装网络插件

 

wget https://raw.githubusercontent.com/cloudnativelabs/kube-router/master/daemonset/kubeadm-kuberouter.yaml

 

kubectl apply -f kubeadm-kuberouter.yaml