mirror of https://github.com/docker/docs.git
350 lines
12 KiB
Markdown
350 lines
12 KiB
Markdown
---
|
|
description: Instructions for installing Docker on CentOS
|
|
keywords: Docker, Docker documentation, requirements, apt, installation, centos, rpm, install, uninstall, upgrade, update
|
|
redirect_from:
|
|
- /engine/installation/centos/
|
|
title: Get Docker for CentOS
|
|
---
|
|
|
|
{% assign minor-version = "17.03" %}
|
|
|
|
To get started with Docker on CentOS, make sure you
|
|
[meet the prerequisites](#prerequisites), then
|
|
[install Docker](#install-docker).
|
|
|
|
## Prerequisites
|
|
|
|
### Docker EE customers
|
|
|
|
To install Docker Enterprise Edition (Docker EE), you need to know the Docker EE
|
|
repository URL associated with your trial or subscription. To get this information:
|
|
|
|
- Go to [https://store.docker.com/?overlay=subscriptions](https://store.docker.com/?overlay=subscriptions).
|
|
- Choose **Get Details** / **Setup Instructions** within the
|
|
**Docker Enterprise Edition for CentOS** section.
|
|
- Copy the URL from the field labeled
|
|
**Copy and paste this URL to download your Edition**.
|
|
|
|
Where the installation instructions differ for Docker EE and Docker CE, use this
|
|
URL when you see the placeholder text `<DOCKER-EE-URL>`.
|
|
|
|
To learn more about Docker EE, see
|
|
[Docker Enterprise Edition](https://www.docker.com/enterprise-edition/){: target="_blank" class="_" }.
|
|
|
|
In addition, you must use the `devicemapper` storage driver if you use Docker EE
|
|
or CS-Engine. On production systems, you must use `direct-lvm` mode, which
|
|
requires one or more dedicated block devices. Fast storage such as solid-state
|
|
media (SSD) is recommended.
|
|
|
|
### 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.
|
|
|
|
```bash
|
|
$ 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](#install-using-the-repository) 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](#docker-ce) and
|
|
[Docker EE](#docker-ee).
|
|
|
|
##### Docker CE
|
|
|
|
{% assign download-url-base = "https://download.docker.com/linux/centos" %}
|
|
|
|
1. Install required packages. `yum-utils` provides the `yum-config-manager`
|
|
utility, and `device-mapper-persistent-data` and `lvm2` are required by the
|
|
`devicemapper` storage driver.
|
|
|
|
```bash
|
|
$ sudo yum install -y yum-utils device-mapper-persistent-data lvm2
|
|
```
|
|
|
|
2. Use the following command to set up the **stable** repository. You always
|
|
need the **stable** repository, even if you want to install **edge** builds
|
|
as well.
|
|
|
|
```bash
|
|
$ sudo yum-config-manager \
|
|
--add-repo \
|
|
{{ download-url-base }}/docker-ce.repo
|
|
```
|
|
|
|
3. **Optional**: Enable the **edge** repository. This repository is included
|
|
in the `docker.repo` file above but is disabled by default. You can enable
|
|
it alongside the stable repository.
|
|
|
|
```bash
|
|
$ sudo yum-config-manager --enable docker-ce-edge
|
|
```
|
|
|
|
You can disable the **edge** repository by running the `yum-config-manager`
|
|
command with the `--disable` flag. To re-enable it, use the
|
|
`--enable` flag. The following command disables the **edge** repository.
|
|
|
|
```bash
|
|
$ sudo yum-config-manager --disable docker-ce-edge
|
|
```
|
|
|
|
[Learn about **stable** and **edge** builds](/engine/installation/).
|
|
|
|
##### Docker EE
|
|
|
|
1. Remove any existing Docker repositories from `/etc/yum.repos.d/`.
|
|
|
|
2. Store your Docker EE repository URL in a `yum` variable in `/etc/yum/vars/`.
|
|
Replace `<DOCKER-EE-URL>` with the URL you noted down in the
|
|
[prerequisites](#prerequisites).
|
|
|
|
```bash
|
|
$ sudo sh -c 'echo "<DOCKER-EE-URL>" > /etc/yum/vars/dockerurl'
|
|
```
|
|
|
|
3. Install required packages. `yum-utils` provides the `yum-config-manager`
|
|
utility, and `device-mapper-persistent-data` and `lvm2` are required by the
|
|
`devicemapper` storage driver.
|
|
|
|
```bash
|
|
$ sudo yum install -y yum-utils device-mapper-persistent-data lvm2
|
|
```
|
|
|
|
4. Use the following command to add the **stable** repository:
|
|
|
|
```bash
|
|
$ sudo yum-config-manager \
|
|
--add-repo \
|
|
<DOCKER-EE-URL>/docker-ee.repo
|
|
```
|
|
|
|
#### Install Docker
|
|
|
|
1. Update the `yum` package index.
|
|
|
|
```bash
|
|
$ 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 Edition | Fingerprint |
|
|
|----------------|------------------------------------------------------|
|
|
| Docker CE | `060A 61C5 1B55 8A7F 742B 77AA C52F EB6B 621E 9F35` |
|
|
| Docker EE | `DD91 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 Edition | Command |
|
|
|----------------|-------------------------------------|
|
|
| Docker CE | `sudo yum install docker-ce` |
|
|
| Docker EE | `sudo 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.
|
|
{:.warning}
|
|
|
|
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.
|
|
|
|
```bash
|
|
$ yum list docker-ce.x86_64 --showduplicates |sort -r
|
|
|
|
docker-ce.x86_64 {{ minor-version }}.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 Edition | Command |
|
|
|----------------|-----------------------------------------------|
|
|
| Docker CE | `sudo yum install docker-ce-<VERSION>` |
|
|
| Docker EE | `sudo yum install docker-ee-<VERSION>` |
|
|
|
|
4. Edit `/etc/docker/daemon.json`. If it does not yet exist, create it. Assuming
|
|
that the file was empty, add the following contents.
|
|
|
|
```json
|
|
{
|
|
"storage-driver": "devicemapper"
|
|
}
|
|
```
|
|
|
|
5. For production systems, you must use `direct-lvm` mode, which requires you
|
|
to prepare the block devices. Follow the procedure in the
|
|
[devicemapper storage driver guide](/engine/userguide/storagedriver/device-mapper-driver.md#configure-direct-lvm-mode-for-production){: target="_blank" class="_" }
|
|
**before starting Docker**.
|
|
|
|
6. Start Docker.
|
|
|
|
```bash
|
|
$ sudo systemctl start docker
|
|
```
|
|
|
|
7. Verify that `docker` is installed correctly by running the `hello-world`
|
|
image.
|
|
|
|
```bash
|
|
$ 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](linux-postinstall.md) 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 the
|
|
[installation instructions](#install-docker), 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 to
|
|
[{{ download-url-base }}/7/x86_64/stable/Packages/]({{ download-url-base }}/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`.
|
|
> [Learn about **stable** and **edge** channels](/engine/installation/).
|
|
|
|
- **Docker EE**: Go to the Docker EE repository URL associated with your
|
|
trial or subscription in your browser. Go to
|
|
`7/x86_64/stable-{{ minor-version }}/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.
|
|
|
|
```bash
|
|
$ sudo yum install /path/to/package.rpm
|
|
```
|
|
|
|
3. Edit `/etc/docker/daemon.json`. If it does not yet exist, create it. Assuming
|
|
that the file was empty, add the following contents.
|
|
|
|
```json
|
|
{
|
|
"storage-driver": "devicemapper"
|
|
}
|
|
```
|
|
|
|
4. For production systems, you must use `direct-lvm` mode, which requires you
|
|
to prepare the block devices. Follow the procedure in the
|
|
[devicemapper storage driver guide](/engine/userguide/storagedriver/device-mapper-driver.md#configure-direct-lvm-mode-for-production){: target="_blank" class="_" }
|
|
**before starting Docker**.
|
|
|
|
5. Start Docker.
|
|
|
|
```bash
|
|
$ sudo systemctl start docker
|
|
```
|
|
|
|
6. Verify that `docker` is installed correctly by running the `hello-world`
|
|
image.
|
|
|
|
```bash
|
|
$ 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](linux-postinstall.md) 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](#install-from-a-package), using `yum -y upgrade`
|
|
instead of `yum -y install`, and pointing to the new file.
|
|
|
|
## Uninstall Docker
|
|
|
|
1. Uninstall the Docker package:
|
|
|
|
| Docker Edition | Command |
|
|
|----------------|--------------------------------|
|
|
| Docker CE | `sudo yum remove docker-ce` |
|
|
| Docker EE | `sudo 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:
|
|
|
|
```bash
|
|
$ sudo rm -rf /var/lib/docker
|
|
```
|
|
|
|
3. If desired, remove the `devicemapper` thin pool and reformat the block
|
|
devices that were part of it.
|
|
|
|
You must delete any edited configuration files manually.
|
|
|
|
## Next steps
|
|
|
|
- Continue to [Post-installation steps for Linux](linux-postinstall.md)
|
|
|
|
- Continue with the [User Guide](../../userguide/index.md).
|