02 docker installation and configuration

1. Use the following command to view the docker version

[root@xxx ~]# docker version

The result as shown in the figure below shows that docker is not installed

2. Install docker

My steps are as follows:

• Installation dependencies

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

The installation ends as shown below:

• Configure mirror warehouse

yum-config-manager --add-repo https://download.docker.com/linux/centos/docker-ce.repo

After the end, the following picture:

• You can check the configuration with the following command (this step can be omitted)

more /etc/yum.repos.d/docker-ce.repo

• Install docker

yum install docker-ce

After entering the command, the following installation information will be listed and asked if you want to install it. Just type y and hit enter:

After the installation is complete, the following figure:

• Enter the following command to set docker to automatically start at boot

systemctl start docker

systemctl enable docker

• Check the docker version information, complete!

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Digression:

    1. There are two versions of docker, docker-ce is a community version, free of charge; docker-cc is an enterprise version, which requires payment;

    2. More is a linux command, you can view file information in pages, the space key to page down, and the b key to page up;

    3. systemctl is a linux command, the function of the subcommand start is to start the service, and the function of enable is to automatically start the next time you boot