centos7 安装k8s集群

Kubernetes集群搭建(centos7)

部署架构

ip	域名	备注	安装软件
192.168.2.246	master	主节点	Docker Kubeadm kubelet kubectl flannel
192.168.2.247	node1	从节点 1	Docker Kubeadm kubelet kubectl

环境准备

• 2台虚拟机CentOS7.x-86_x64
• 硬件配置：2GB或更多RAM，2个CPU或更多CPU，硬盘30GB或更多
• 集群中所有机器之间网络互通
• 可以访问外网，需要拉取镜像
• 禁止swap分区

设置静态ip

vim /etc/sysconfig/network-scripts/ifcfg-eth0

TYPE=Ethernet
BOOTPROTO=static
DEVICE=eth0
ONBOOT=yes
IPADDR=192.168.2.247
NETMASK=255.255.255.0
GATEWAY=192.168.2.1
DNS1=114.114.114.114

// 重启网络
systemctl restart network

修改yum源

yum install wget
rm -rf /etc/yum.repos.d/*
// 重新下载阿里云源
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
yum list && yum clean all

Master节点安装 kubeadm, kubelet and kubectl

• 安装基本软件包

  yum install net‐tools vim bash‐comp* ‐y
  

• 设置主机名，管理节点设置主机名为master

  hostnamectl set‐hostname master
  su -
  

• 配置节点域名

  vim /etc/hosts
  192.168.2.246 master
  192.168.2.247 node1
  

• 关闭防火墙

  systemctl stop firewalld && systemctl disable firewalld
  

• 关闭SeLinux

  setenforce 0
  sed -i "s/SELINUX=enforcing/SELINUX=disabled/g" /etc/selinux/config
  

• 关闭 swap

  swapoff -a
  yes | cp /etc/fstab /etc/fstab_bak
  cat /etc/fstab_bak |grep -v swap > /etc/fstab
  

• 配置Docker, K8S的阿里云yum源

  cat >>/etc/yum.repos.d/kubernetes.repo <

• 安装指定版本kubeadm, kubelet and kubectl

  yum install -y kubeadm-1.23.0-0 kubectl-1.23.0-0 kubelet-1.23.0-0 --disableexcludes=kubernetes
  vim /etc/sysconfig/kubelet
  # 添加下面的配置
  KUBELET_CGROUP_ARGS="--cgroup-driver=systemd"
  KUBE_PROXY_MODE="ipvs
  # 设置开机启动
  systemctl daemon-reload && systemctl enable kubelet
  systemctl restart kubelet
  
  kubeadm init --kubernetes-version=1.23.0 --image-repository registry.aliyuncs.com/google_containers --pod-network-cidr=10.244.0.0/16
  

• 创建必要文件

  mkdir -p $HOME/.kube
  sudo cp -i /etc/kubernetes/admin.conf $HOME/.kube/config
  sudo chown $(id -u):$(id -g) $HOME/.kube/config
  

• 修改Services的负载均衡模式为ipvs

  kubectl edit configmap kube-proxy -n kube-system
  mode: "ipvs"
  # 删除现有的kube-proxy类型的pods
  

• 安装flannel网络插件

  wget https://raw.githubusercontent.com/flannel-io/flannel/master/Documentation/kube-flannel.yml
  kubectl apply -f kube-flannel.yml
  

• 从节点join到master

  kubeadm join 192.168.2.246:6443 --token 7lye11.tvmmnsdzrnexwh6c --discovery-token-ca-cert-hash sha256:5a20061b20b7de56aebcaea7f9903352ae23981377ca9cfe45dd01e24bcfe751
  # 查看nodes
  kubectl get nodes