github.com/nf/docker@v1.8.1/docs/installation/fedora.md

<!--[metadata]>
+++
title = "Installation on Fedora"
description = "Instructions for installing Docker on Fedora."
keywords = ["Docker, Docker documentation, Fedora, requirements,  linux"]
[menu.main]
parent = "smn_linux"
+++
<![end-metadata]-->

# Fedora

Docker is supported on the following versions of Fedora:

- Fedora 20 
- Fedora 21
- Fedora 22 

This page instructs you to install using Docker-managed release packages and
installation mechanisms. Using these packages ensures you get the latest release
of Docker. If you wish to install using Fedora-managed packages, consult your
Fedora release documentation for information on Fedora's Docker support.

##Prerequisites

Docker requires a 64-bit installation regardless of your Fedora version. Also, your kernel must be 3.10 at minimum. To check your current kernel
version, open a terminal and use `uname -r` to display your kernel version:

    $ uname -r 
    3.19.5-100.fc20.x86_64

If your kernel is at a older version, you must update it.

Finally, is it recommended that you fully update your system. Please keep in
mind that your system should be fully patched to fix any potential kernel bugs. Any
reported kernel bugs may have already been fixed on the latest kernel packages 


## Install

There are two ways to install Docker Engine.  You can use `curl` with the  `get.docker.com` site. This method runs an installation script which installs via the `yum` package manager. Or you can install with the `yum` package manager directly yourself.

### Install with the script


1. Log into your machine as a user with `sudo` or `root` privileges.

2. Make sure your existing yum packages are up-to-date.

		$ sudo yum update
		
3. Run the Docker installation script.
		
		$ curl -sSL https://get.docker.com/ | sh
		
		This script adds the `docker.repo` repository and installs Docker.

4. Start the Docker daemon.

		$ sudo service docker start

5. Verify `docker` is installed correctly by running a test image in a container.

		$ sudo docker run hello-world
		Unable to find image 'hello-world:latest' locally
		latest: Pulling from hello-world
		a8219747be10: Pull complete 
		91c95931e552: Already exists 
		hello-world:latest: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security.
		Digest: sha256:aa03e5d0d5553b4c3473e89c8619cf79df368babd1.7.1cf5daeb82aab55838d
		Status: Downloaded newer image for hello-world:latest
		Hello from Docker.
		This message shows that your installation appears to be working correctly.

		To generate this message, Docker took the following steps:
		 1. The Docker client contacted the Docker daemon.
		 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
				(Assuming it was not already locally available.)
		 3. The Docker daemon created a new container from that image which runs the
				executable that produces the output you are currently reading.
		 4. The Docker daemon streamed that output to the Docker client, which sent it
				to your terminal.

		To try something more ambitious, you can run an Ubuntu container with:
		 $ docker run -it ubuntu bash

		For more examples and ideas, visit:
		 http://docs.docker.com/userguide/

### Install without the script

1. Log into your machine as a user with `sudo` or `root` privileges.

2. Make sure your existing yum packages are up-to-date.

		$ sudo yum update
    
3. Add the yum repo yourself.

    For Fedora 20 run:

        $ cat >/etc/yum.repos.d/docker.repo <<-EOF
        [dockerrepo]
        name=Docker Repository
        baseurl=https://yum.dockerproject.org/repo/main/fedora/20
        enabled=1
        gpgcheck=1
        gpgkey=https://yum.dockerproject.org/gpg
        EOF

    For Fedora 21 run:

        $ cat >/etc/yum.repos.d/docker.repo <<-EOF
        [dockerrepo]
        name=Docker Repository
        baseurl=https://yum.dockerproject.org/repo/main/fedora/21
        enabled=1
        gpgcheck=1
        gpgkey=https://yum.dockerproject.org/gpg
        EOF

    For Fedora 22 run:

		$ cat >/etc/yum.repos.d/docker.repo <<-EOF
        [dockerrepo]
        name=Docker Repository
        baseurl=https://yum.dockerproject.org/repo/main/fedora/22
        enabled=1
        gpgcheck=1
        gpgkey=https://yum.dockerproject.org/gpg
        EOF

4. Install the Docker package.

        $ sudo yum install docker-engine
        
5. Start the Docker daemon.

		$ sudo service docker start

6. Verify `docker` is installed correctly by running a test image in a container.

		$ sudo docker run hello-world
 
## Create a docker group		

The `docker` daemon binds to a Unix socket instead of a TCP port. By default
that Unix socket is owned by the user `root` and other users can access it with
`sudo`. For this reason, `docker` daemon always runs as the `root` user.

To avoid having to use `sudo` when you use the `docker` command, create a Unix
group called `docker` and add users to it. When the `docker` daemon starts, it
makes the ownership of the Unix socket read/writable by the `docker` group.

>**Warning**: The `docker` group is equivalent to the `root` user; For details
>on how this impacts security in your system, see [*Docker Daemon Attack
>Surface*](/articles/security/#docker-daemon-attack-surface) for details.

To create the `docker` group and add your user:

1. Log into your system as a user with `sudo` privileges.

2. Create the `docker` group and add your user.

    `sudo usermod -aG docker your_username`

3. Log out and log back in.

    This ensures your user is running with the correct permissions.

4. Verify your work by running `docker` without `sudo`.

        $ docker run hello-world
				Unable to find image 'hello-world:latest' locally
				latest: Pulling from hello-world
				a8219747be10: Pull complete 
				91c95931e552: Already exists 
				hello-world:latest: The image you are pulling has been verified. Important: image verification is a tech preview feature and should not be relied on to provide security.
				Digest: sha256:aa03e5d0d5553b4c3473e89c8619cf79df368babd18681cf5daeb82aab55838d
				Status: Downloaded newer image for hello-world:latest
				Hello from Docker.
				This message shows that your installation appears to be working correctly.

				To generate this message, Docker took the following steps:
				 1. The Docker client contacted the Docker daemon.
				 2. The Docker daemon pulled the "hello-world" image from the Docker Hub.
						(Assuming it was not already locally available.)
				 3. The Docker daemon created a new container from that image which runs the
						executable that produces the output you are currently reading.
				 4. The Docker daemon streamed that output to the Docker client, which sent it
						to your terminal.

				To try something more ambitious, you can run an Ubuntu container with:
				 $ docker run -it ubuntu bash

				For more examples and ideas, visit:
				 http://docs.docker.com/userguide/
 
## Start the docker daemon at boot

To ensure Docker starts when you boot your system, do the following:

    $ sudo chkconfig docker on

If you need to add an HTTP Proxy, set a different directory or partition for the
Docker runtime files, or make other customizations, read our Systemd article to
learn how to [customize your Systemd Docker daemon options](/articles/systemd/).

## Running Docker with a manually-defined network

If you manually configure your network using `systemd-network` with `systemd` version 219 or higher, containers you start with Docker may be unable to access your network.
Beginning with version 220, the forwarding setting for a given network (`net.ipv4.conf.<interface>.forwarding`) defaults to *off*. This setting prevents IP forwarding. It also conflicts with Docker which enables the `net.ipv4.conf.all.forwarding` setting within a container.

To work around this, edit the `<interface>.network` file in
`/usr/lib/systemd/network/` on your Docker host  (ex: `/usr/lib/systemd/network/80-container-host0.network`) add the following block:

```
[Network]
...
IPForward=kernel
# OR
IPForward=true
...
```

This configuration allows IP forwarding from the container as expected.

## Uninstall

You can uninstall the Docker software with `yum`.  

1. List the package you have installed.

		$ yum list installed | grep docker
		yum list installed | grep docker
		docker-engine.x86_64                1.7.1-0.1.fc20
																																								 @/docker-engine-1.7.1-0.1.fc20.el7.x86_64

2. Remove the package.

		$ sudo yum -y remove docker-engine.x86_64 

	This command does not remove images, containers, volumes, or user-created
	configuration files on your host. 

3. To delete all images, containers, and volumes, run the following command:

		$ rm -rf /var/lib/docker

4. Locate and delete any user-created configuration files.