How to Upgrade / Update Docker on Fedora 22

Introduction

Docker is a container-based software framework commonly used for automating deployment of applications. “Containers” are encapsulated, lightweight, and portable application modules.

Pre-Flight Check

• These instructions are intended for upgrading / updating Docker.
• I’ll be working from a Liquid Web Self Managed Fedora 22 server, and I’ll be logged in as root.

Step 1: Upgrade / Update Docker on Fedora 22

Just one simple command:

dnf upgrade -y docker-io

Step 2: Other Docker Commands

Docker should already be started, but if it isn’t then you can start it with the following command:

systemctl start docker

Docker should also already be configured to start when the server boots, but if it isn’t then you can do so with the following command:

systemctl enable docker

Step 2: Download a Docker Container

Let’s begin using Docker! Download the fedora Docker image:

docker pull fedora

Step 3: Run a Docker Container

Now, to setup a basic fedora container with a bash shell, we just run one command. docker run will run a command in a new container, -i attaches stdin and stdout, -t allocates a tty, and we’re using the standard fedora container.

docker run -i -t fedora /bin/bash

That’s it! You’re now using a bash shell inside of a fedora docker container.

To disconnect, or detach, from the shell without exiting use the escape sequence Ctrl-p + Ctrl-q.

There are many community containers already available, which can be found through a search. In the command below I am searching for the keyword fedora:

docker search fedora