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In the last article, we shared the evolution of containers, and then expanded the nature of containers from the perspectives of process isolation, file isolation, namespace, cgroups, and libcontainer. This article will explain the installation of Docker version and introduce the technical architecture of Docker.

If you haven't seen the previous content: you can click "what is the nature of the container?" Where does the container come from? "

Docker version

After 1. 13, Docker uses a timeline as its version number. The versions of Docker are divided into community version (CE) and enterprise version (EE). The enterprise version will provide additional fee-based services, such as officially certified plug-ins, containers, etc.

The community version is divided into three versions:

Stable version: stable. We usually use this version.

Pre-release version: test

To be released: nightly

Docker installation

1. Uninstall docker

Uninstall an existing version of docker on the host

two。 Pre-installation preparation

Configure yum

1. Install yum tools and devicemapper storage drivers

two。 Configure yum

In the process of yum makecache, you can see that the package that can be installed and used is the dockerr-ce-stable version, that is, only the stable repository is opened by default in repo.

At this point, if we need to install the test or nightly version, we can use yum-config-manger-enable docker-ce-test to open the repository.

Install docker

You can use yum list to view the version of docker in the repository:

1. Install docker

two。 Start docker

Systemctl start docker

Systemctl enable docker

3. View docker version

Configuration of Docker Image download Accelerator

Ali image accelerator can be configured. Refer to the link for configuration method:

Https://cr.console.aliyun.com/cn-hangzhou/instances/mirrors

For those with docker client version greater than 1.10.0, you can use the accelerator by modifying the / etc/docker/daemon.json file.

If the file does not exist, it is created directly.

Operation command:

Sudo mkdir-p / etc/docker

Sudo tee / etc/docker/daemon.json

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