6

Prerequisites:

Node	OS	IP
k8s-master	CentOS7	192.168.137.161
k8s-node1	CentOS7	192.168.137.162

Install Docker on CentOS:

1. Setup software package, by running below command:
   

   yum install -y yum-utils device-mapper-persistent-data lvm2

2. Configuring stable repository, you can choose official site but will be a little bit slow, or you can go with domestic site like Aliyun.
   

   # Choose only one from below repository
   # Official repository
   yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo
   
   # Aliyun
   yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo
   
   # tsinghua University
   yum-config-manager --add-repo https://mirrors.tuna.tsinghua.edu.cn/docker-ce/linux/centos/docker-ce.repo

3. Install Docker CE edition by running below command
   

   yum install docker-ce docker-ce-cli containerd.io -y        # Install latest version as default

   systemctl start docker && systemctl enable docker           # start docker and set as auto launch while start system

    After docker installed and start, you can running some simple docker command to check if Docker is working as expected:
   

4. Get bash completion installed by running below command
   

   yum -y install bash-completion
   source /etc/profile.d/bash_completion.sh

   

5. Configure image registry, by create file /etc/docker/daemon.json and set registry as below:
   

   cat <<EOF > /etc/docker/daemon.json
   {
     "registry-mirrors": [
       "https://registry.docker-cn.com",
       "http://hub-mirror.c.163.com",
       "https://docker.mirrors.ustc.edu.cn"
     ]
   }

6. Retart docker to reload above config by execute command below
   

   systemctl daemon-reload
   systemctl restart docker

7. All good for Docker installation now, it's UP AND RUNNING. Remeber to apply the same installation for k8s-node1.
   Next we will install kubernetes via kubeadm.