腳本安裝docker

#!/bin/bash

# remove existed docker
remove(){
    yum remove docker docker-client docker-client-latest docker-common docker-latest docker-latest-logrotate docker-logrotate docker-engine &> /dev/null
}

install(){
    # 
    echo "installing... please wait"
    yum install -y yum-utils device-mapper-persistent-data lvm2 &> /dev/null
    #
    yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo &> /dev/null
    #
    yum install -y docker-ce docker-ce-cli containerd.io &> /dev/null
    echo "finished installation"
    #
    echo "start docker"
    systemctl start docker
    docker run hello-world

}

do_it(){
    remove;
    install;

}
do_it