docker安装-升级-卸载

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Get Docker CE on CentOS

You can install Docker CE on CentOS in just three steps.

Enterprise customers can also install Docker EE for CentOS.

Prerequisites

Docker CE is supported on CentOS 7.3 64-bit.

1. Set up the repository

Set up the Docker CE repository on CentOS:

sudo yum install -y yum-utilssudo yum-config-manager \    --add-repo \    https://download.docker.com/linux/centos/docker-ce.reposudo yum makecache fast

2. Get Docker CE

Install the latest version of Docker CE on CentOS:

sudo yum -y install docker-ce

Start Docker:

sudo systemctl start docker

3. Test your Docker CE installation

Test your installation:

sudo docker run hello-world

Get Docker for CentOS

Prerequisites

OS requirements

To install Docker, you need the 64-bit version of CentOS 7.

Uninstall old versions

Older versions of Docker were called docker or docker-engine. If these are installed, uninstall them, along with associated dependencies.

$ sudo yum remove docker \                  docker-common \                  container-selinux \                  docker-selinux \                  docker-engine

It’s OK if yum reports that none of these packages are installed.

The contents of /var/lib/docker/, including images, containers, volumes, and networks, are preserved. The Docker CE package is now called docker-ce, and the Docker EE package is now called docker-ee.

Install Docker

You can install Docker in different ways, depending on your needs:

• Most users set up Docker’s repositories and install from them, for ease of installation and upgrade tasks. This is the recommended approach.

• Some users download the RPM package and install it manually and manage upgrades completely manually. This is useful in situations such as installing Docker on air-gapped systems with no access to the internet.

Install using the repository

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

SET UP THE REPOSITORY

Repository set-up instructions are different for Docker CE and Docker EE.

Docker CE

1. Install yum-utils, which provides the yum-config-manager utility:

   $ sudo yum install -y yum-utils

2. Use the following command to set up the stable repository:

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

3. Optional: Enable the edge repository. This repository is included in thedocker.repo file above but is disabled by default. You can enable it alongside the stable repository.

   $ sudo yum-config-manager --enable docker-ce-edge

   You can disable the edge repository by running the yum-config-managercommand with the --disable flag. To re-enable it, use the --enable flag. The following command disables the edge repository.

   $ sudo yum-config-manager --disable docker-ce-edge

INSTALL DOCKER

1. Update the yum package index.

   $ sudo yum makecache fast

   If this is the first time you have refreshed the package index since adding the Docker repositories, you will be prompted to accept the GPG key, and the key’s fingerprint will be shown. Verify that the fingerprint is correct, and if so, accept the key.

   Docker EditionFingerprintDocker CE060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35Docker EEDD91 1E99 5A64 A202 E859 07D6 BC14 F10B 6D08 5F96

2. Install the latest version of Docker, or go to the next step to install a specific version.

   Docker EditionCommandDocker CEsudo yum install docker-ceDocker EEsudo yum install docker-ee

   Warning: If you have multiple Docker repositories enabled, installing or updating without specifying a version in the yum install or yum update command will always install the highest possible version, which may not be appropriate for your stability needs.

3. On production systems, you should install a specific version of Docker instead of always using the latest. List the available versions. This example uses the sort -r command to sort the results by version number, highest to lowest, and is truncated.

   Note: This yum list command only shows binary packages. To show source packages as well, omit the .x86_64 from the package name.

   $ yum list docker-ce.x86_64  --showduplicates |sort -rdocker-ce.x86_64  17.03.0.el7                               docker-ce-stable  

   The contents of the list depend upon which repositories are enabled, and will be specific to your version of CentOS (indicated by the .el7 suffix on the version, in this example). Choose a specific version to install. The second column is the version string. The third column is the repository name, which indicates which repository the package is from and by extension its stability level. To install a specific version, append the version string to the package name and separate them by a hyphen (-):

   Docker EditionCommandDocker CEsudo yum install docker-ce-<VERSION>Docker EEsudo yum install docker-ee-<VERSION>

4. Start Docker.

   $ sudo systemctl start docker

5. Verify that docker is installed correctly by running the hello-worldimage.

   $ sudo docker run hello-world

   This command downloads a test image and runs it in a container. When the container runs, it prints an informational message and exits.

Docker is installed and running. You need to use sudo to run Docker commands. Continue to Linux postinstall to allow non-privileged users to run Docker commands and for other optional configuration steps.

UPGRADE DOCKER

To upgrade Docker, first run sudo yum makecache fast, then follow theinstallation instructions, choosing the new version you want to install.

Install from a package

If you cannot use Docker’s repository to install Docker, you can download the.rpm file for your release and install it manually. You will need to download a new file each time you want to upgrade Docker.

1. This step is different for Docker CE and Docker EE.

   • Docker CE: Go tohttps://download.docker.com/linux/centos/7/x86_64/stable/Packages/and download the .rpm file for the Docker version you want to install.

     Note: To install an edge package, change the word stable in the > URL to edge. For information about stable and edgebuilds, see Docker variants.

   • Docker EE: Go to the Docker EE repository URL associated with your trial or subscription in your browser. Go to 7/x86_64/stable-17.03/Packages/ and download the .rpm file for the Docker version you want to install.

2. Install Docker, changing the path below to the path where you downloaded the Docker package.

   $ sudo yum install /path/to/package.rpm

3. Start Docker.

   $ sudo systemctl start docker

4. Verify that docker is installed correctly by running the hello-worldimage.

   $ sudo docker run hello-world

   This command downloads a test image and runs it in a container. When the container runs, it prints an informational message and exits.

Docker is installed and running. You need to use sudo to run Docker commands. Continue to Post-installation steps for Linux to allow non-privileged users to run Docker commands and for other optional configuration steps.

UPGRADE DOCKER

To upgrade Docker, download the newer package file and repeat the installation procedure, using yum -y upgrade instead of yum -y install, and pointing to the new file.

Uninstall Docker

1. Uninstall the Docker package:

   Docker EditionCommandDocker CEsudo yum remove docker-ceDocker EEsudo yum remove docker-ee

2. Images, containers, volumes, or customized configuration files on your host are not automatically removed. To delete all images, containers, and volumes:

   $ sudo rm -rf /var/lib/docker

You must delete any edited configuration files manually.