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Instructions for installing Docker on Oracle Linux Docker, Docker documentation, requirements, installation, oracle, ol, rpm, install, uninstall, upgrade, update
/engine/installation/oracle/
Get Docker for Oracle Linux

To get started with Docker on Oracle Linux, make sure you meet the prerequisites, then install Docker.

Prerequisites

OS requirements

To install Docker, you need the 64-bit version of Oracle Linux 6 or 7 running the Unbreakable Enterprise Kernel Release 4 (4.1.12) or higher.

For Oracle Linux 6, you need to enable extra repositories to install UEK4. See Obtaining and installing the UEK packages{: target="blank" class="" }.

The OverlayFS2 storage driver is only supported when running the UEK4.

Remove unofficial Docker packages

Oracle's repositories used to contain an older version of Docker with the package name docker instead of docker-engine. If you still have this version of Docker installed, remove it using the following command:

$ sudo yum -y remove docker

Oracle's repositories also contain the Oracle-supported version of Docker which uses the same docker-engine name as the official Docker package. If you have installed this version of Docker, it will automatically be upgraded by the official version.

You may also have to remove the package docker-engine-selinux which conflicts with the official docker-engine package. Remove it with the following command:

$ sudo yum -y remove docker-engine-selinux

This package has already been deprecated by Oracle so will only exist on systems that have an older version of the Oracle-supported package installed.

The contents of /var/lib/docker are not removed, so any images, containers, or volumes you created using the older version of Docker are preserved.

Install Docker

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

  • Users who do not require Docker support from Oracle can set up the official Docker 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.

  • Some users cannot use third-party repositories or who wish to receive Docker support from Oracle must rely on the version of Docker in the Oracle repositories. This version of Docker may be out of date. Those users should consult the Oracle Linux Docker User's Guide and not follow these procedures.

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, update, or downgrade Docker from the repository.

Set up the repository

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

    $ sudo yum install -y yum-utils

  2. Use one of the following commands to set up the stable repository, depending on your version of Oracle Linux:

    Oracle Linux 7:

    $ sudo yum-config-manager \
    --add-repo \
    https://docs.docker.com/engine/installation/linux/repo_files/oracle/docker-ol7.repo

    Oracle Linux 6:

    $ sudo yum-config-manager \
    --add-repo \
    https://docs.docker.com/engine/installation/linux/repo_files/oracle/docker-ol6.repo

  3. Optional: Enable the testing repository. This repository is included in the docker.repo file above but is disabled by default. You can enable it alongside the stable repository. Do not use unstable repositories on on production systems or for non-testing workloads.

    Warning: If you have both stable and unstable 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 will almost certainly be an unstable one.

    $ sudo yum-config-manager --enablerepo docker-testing

    You can disable the testing repository by running the yum-config-manager command with the --disablerepo flag. To re-enable it, use the --set-enabled flag. The following command disables the testing repository.

    $ sudo yum-config-manager --disablerepo docker-testing

Install Docker

  1. Update the yum package index.

    $ sudo yum makecache fast

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

    $ sudo yum -y install docker-engine

    If this is the first time you are installing a package from the Docker repositories, the GPG key and fingerprint will be shown and automatically accepted.

    If you do not want to automatically accept the GPG key, remove the -y parameter so that yum prompts you to accept the GPG manually.

    Ensure the GPG details match the following:

    Retrieving key from https://yum.dockerproject.org/gpg
Importing GPG key 0x2C52609D:
Userid     : "Docker Release Tool (releasedocker) <docker@docker.com>"
Fingerprint: 5811 8e89 f3a9 1289 7c07 0adb f762 2157 2c52 609d
From       : https://yum.dockerproject.org/gpg

    Warning: If you have both stable and unstable repositories enabled, installing or updating Docker without specifying a version in the yum install or yum upgrade command will always install the highest available version, which will almost certainly be an unstable one.

  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. The output 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-engine.x86_64  --showduplicates |sort -nr

docker-engine.x86_64  1.13.0-1.el6                                docker-main   
docker-engine.x86_64  1.12.3-1.el6                                docker-main   
docker-engine.x86_64  1.12.2-1.el6                                docker-main   
docker-engine.x86_64  1.12.1-1.el6                                docker-main

    The contents of the list depend upon which repositories you have enabled, and will be specific to your version of Oracle Linux (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 extension its stability level. Oracle ships the docker-engine in its addon repository so you may also see that repository in this column if you have it enabled.

    To install a specific version, append the version string to the package name and separate them by a hyphen (-):

    $ sudo yum -y install docker-engine-<VERSION_STRING>

    The Docker daemon does not start automatically.

  4. Start the Docker daemon. Use systemctl on Oracle Linux 7 or service on Oracle Linux 6.

    Oracle Linux 7:

    $ sudo systemctl start docker

    Oracle Linux 6:

    $ sudo service docker start

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

    $ 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, either run sudo yum update docker-engine to upgrade to the latest available version or if you would prefer to upgrade to a specific version, first run sudo yum makecache fast, then follow the installation 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. Go to https://yum.dockerproject.org/repo/main/oraclelinux/ and choose the subdirectory for your Oracle Linux version. Download the .rpm file for the Docker version you want to install.

    Note: To install a testing version, change the word main in the URL to testing. Do not use unstable versions of Docker in production or for non-testing workloads.

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

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

    The Docker daemon does not start automatically.

  3. Start the Docker daemon. Use systemctl on Oracle Linux 7 or service on Oracle Linux 6.

    Oracle Linux 7:

    $ sudo systemctl start docker

    Oracle Linux 6:

    $ sudo service docker start

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

    $ 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:

    $ sudo yum remove docker-engine

  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

    Note: If you are using the btrfs graph driver, you will need to manually remove any subvolumes that were created by the Docker Engine before removing the rest of the data. Review the Oracle Linux 7 Administrator Guide for more information on how to remove btrfs subvolumes or see the output of man btrfs-subvolume for information on removing btrfs subvolumes.

You must delete any edited configuration files manually.

Next steps