Installing Alibaba Cloud Server with Docker and the pitfalls encountered in installing it in a virtual machine (summary of problems)

Docker installation (Alibaba Cloud Server)

Docker official centos installation tutorial

Uninstall old versions

$ sudo yum remove docker \
         docker-client \
         docker-client-latest \
         docker-common \
         docker-latest \
         docker-latest-logrotate \
         docker-logrotate \
         docker-engine

Install using repository

Before you install Docker Engine for the first time on a new host, you need to set up the Docker repository. Afterwards, you can install and update Docker from the repository.

Setting up the repository

Install the yum-utils package (which provides yum-config-manager utility) and set up the stable repository.

$ sudo yum install -y yum-utils

$ sudo yum-config-manager --add-repo http://mirrors.aliyun.com/docker-ce/linux/centos/docker-ce.repo

Install Docker Engine

Install the latest version of Docker Engine and containers

$ sudo yum install docker-ce docker-ce-cli containerd.io

Start Docker

$ sudo systemctl start docker

Verify that Docker Engine is installed correctly by running the hello-world image

$ sudo docker run hello-world

Uninstall Docker

Uninstall Docker Engine, CLI, and Containerd packages:

$ sudo yum remove docker-ce docker-ce-cli containerd.io

Images, containers, volumes, or custom configuration files on the host are not automatically deleted. To remove all images, containers, and volumes:

$ sudo rm -rf /var/lib/docker

You must manually delete any edited configuration files.

Install Docker on CentOS 7 virtual machine

There are many tutorials online. The blogger reported the following error message during the installation process:

Job for docker.service failed because the control process exited with error code. See “systemctl status docker.service” and “journalctl -xe” for details.

Use systemctl status docker to view detailed information.

Feb 19 15:39:43 centos7 systemd[1]: Failed to start Docker Application Container Engine.

Check the docker version, there is only client, no server

Workaround

Run vi /etc/sysconfig/selinux and change the selinux attribute value to disabled. Then restart the system; docker started successfully!

SELinux (Security-Enhanced Linux) is the implementation of mandatory access control by the National Security Agency (NSA).
It is the most outstanding new security subsystem in the history of Linux. But we generally don't use it.
Because it manages too many things, if you want to ensure security, you can use firewalls and other measures.
SELinux has three states: enforcing (executing), permissive (not executing but generating a warning),
disabled

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