Write your own docker script to install the docker environment

Dcoker environment uses script deployment:
Test environment: Centos7-1810 version
Download link: https://archive.kernel.org/centos-vault/7.6.1810/isos/x86_64/
Docker official website: https://www.docker. com/
Docker official source: https://download.docker.com/linux/
Github Docker source code: https://github.com/docker/docker-ce

The script content is as follows:

#!/bin/bash
	yum clean all ; yum makecache 

	if type -p docker ;then
				echo "Docker您已经安装了.."
				exit 0
	else
		yum install -y yum-utils device-mapper-persistent-data lvm2
		yum-config-manager  --add-repo https://download.docker.com/linux/centos/docker-ce.repo 
		yum install docker-ce docker-ce-cli containerd.io -y  

	fi

systemctl start docker    && 
systemctl enable docker   && 

#配置加速器
sudo mkdir -p /etc/docker &&
sudo tee /etc/docker/daemon.json <<EOF
{
  "registry-mirrors": ["https://2n9uoybw.mirror.aliyuncs.com"]
}
EOF


systemctl daemon-reload   &&    systemctl restart docker  
echo "net.bridge.bridge-nf-call-ip6tables = 1" >> /etc/sysctl.conf 
echo "net.bridge.bridge-nf-call-iptables = 1" >> /etc/sysctl.conf 
sysctl -p 
systemctl restart docker
docker info

If you make a mistake, please don't mind if I am still a beginner in docker