k8s 安装

1. 安装前装备

1.1 检查 centos

1cat /etc/redhat-releas

1.2 检查hostname

• 此处hostname的输出将会是该机器在K8s 集群中的名字

  1hostnamectl set-hostname <newhostname> 
  

1.3 检查CPU的信息

• Architecture: x86_64

• CPU(s): 2

  1lscpu
  

1.4 检查网卡信息

• ip route show

  

• 可以得知图中 默认的网卡为eth0

• ip address (相关命令)

• 保证 k8s的节点的ip 相互之间能ping (无需 NAT 映射、无安全组或防火墙隔离)

1.5 关闭selinux

• setenforce 0

  

1屏蔽
2setenforce 0
3
4永久屏蔽
5sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config

1.6 关闭 swap

• swapoff -a

  

1# 复制原来的磁盘的加载
2yes | cp /etc/fstab /etc/fstab_bak
3# 磁盘加载 屏蔽swap的加载
4cat /etc/fstab_bak |grep -v swap > /etc/fstab

1.7 修改sysctl.conf

• 文件地址：/etc/sysctl.conf

• 文件内容

  1net.ipv4.ip_forward = 1
  2net.bridge.bridge-nf-call-ip6tables = 1
  3net.bridge.bridge-nf-call-iptables = 1
  4net.ipv6.conf.all.disable_ipv6 = 1
  5net.ipv6.conf.default.disable_ipv6 = 1
  6net.ipv6.conf.lo.disable_ipv6 = 1
  7net.ipv6.conf.all.forwarding = 1
  

• 1sysctl 生效
  2sysctl -p
  

2. docker配置修改

• 文件地址：/etc/docker/daemon.json

• 文件内容

   1{
   2  "insecure-registries": ["docker.nexus.re
   3                          gistry:5000"],
   4  "registry-mirrors": ["http://docker.mirrors.ustc.edu.cn"],
   5  "exec-opts": ["native.cgroupdriver=systemd"],
   6  "log-driver": "json-file",
   7  "log-opts": {
   8    "max-size": "100m",
   9    "max-file":"3"
  10  },
  11  "data-root":"/docker/libdocker",
  12  "storage-driver": "overlay2",
  13  "storage-opts": [
  14    "overlay2.override_kernel_check=true"
  15  ],
  16  "dns":["10.168.2.1","1141.114.114.114","8.8.8.8"]
  17}
  

• 1## 使docker的修改生效
  2systemctl daemon-reload
  3systemctl enable docker
  4systemctl restart docker
  

3. 部分配置软件安装

3.1 安装nfs 相关

• 1yum install -y nfs-utils
  

3.2 安装wget

• 1yum install -y wget
  

4. 安装k8s相关服务和管理工具

4.1 移除原先安装k8s

• 命令

  1yum remove -y kubelet kubeadm kubectl
  

4.2 安装kubelet,kubeadm,kubectl

• 安装yum源 (国外源)

  1cat <<EOF > /etc/yum.repos.d/kubernetes.repo
  2[kubernetes]
  3name=Kubernetes
  4baseurl=https://packages.cloud.google.com/yum/repos/kubernetes-el7-x86_64
  5enabled=1
  6gpgcheck=1
  7repo_gpgcheck=1
  8gpgkey=https://packages.cloud.google.com/yum/doc/yum-key.gpg https://packages.cloud.google.com/yum/doc/rpm-package-key.gpg
  9EOF
  

• 安装国内源 （阿里源） yum 只要一个可用的就可以

  1cat <<EOF > /etc/yum.repos.d/kubernetes.repo
  2[kubernetes]
  3name=Kubernetes
  4baseurl=https://mirrors.aliyun.com/kubernetes/yum/repos/kubernetes-el7-x86_64
  5enabled=1
  6gpgcheck=1
  7repo_gpgcheck=1
  8gpgkey=https://mirrors.aliyun.com/kubernetes/yum/doc/yum-key.gpg https://mirrors.aliyun.com/kubernetes/yum/doc/rpm-package-key.gpg
  9EOF
  

• 安装 kubelet kubeadm kubectl

  1yum install -y kubelet-1.23.1 kubeadm-1.23.1 kubectl-1.23.1
  2
  

• 配置 服务自启动

  1systemctl enable kubelet 
  2systemctl start kubelet
  

• docker 重启启动

  1systemctl daemon-reload
  2systemctl restart docker
  

5. 下载需要的k8s 镜像

5.1 检测需要下载的镜像

• 命令

  1kubeadm config images list