# Docker

> A beginner's guide to Docker on CentOS, covering installation, running containers, and basic management with an introduction to Docker commands.

- Canonical: https://www.russ.cloud/2014/02/15/docker/
- Published: 2014-02-15
- Author: Russ McKendrick
- Tags: Docker, Tools

---

Been playing a little with [Docker](http://docker.io/) this afternoon, while its something I have been aware for a while its not something I have really looked into.

As I prefer working with CentOS rather than Ubuntu its taken me a while to get the motivation to do any more than some reading, however as the latest version now runs on RHE compatible

```bash frame="terminal" title="Docker 1/4"
yum install http://www.mirrorservice.org/sites/dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
yum -y install docker-io
service docker start
chkconfig docker on
```


Once the services are installed pull down some images to test with;

```bash frame="terminal" title="Docker 2/4"
docker pull ubuntu
docker pull centos
docker run centos /bin/echo hello world
```


the last command launches a CentOS container, runs the echo and then exits. To do something more interesting;

```bash frame="terminal" title="Docker 3/4"
CONTAINER_ID=$(sudo docker run -d ubuntu /bin/sh -c “while true; do echo hello world; sleep 1; done”)
docker ps
docker attach -sig-proxy=false $CONTAINER_ID
docker logs $CONTAINER_ID
docker stop $CONTAINER_ID
```


Once you have some containers running the following commands are useful;

```bash frame="terminal" title="Docker 4/4"
docker info # Get some information on the installation
docker images # List the available images
docker ps # Whats running?
docker search [TERM] # Search for images
```


This is probably one of the better introductions to Docker I have seen;

and some further reading;

- [Simple SAAS](http://developer.rackspace.com/blog/slumlord-hosting-with-docker.html)
- [List of projects](http://blog.docker.io/2013/07/docker-projects-from-the-docker-community/)
- [Puppet Module](http://forge.puppetlabs.com/garethr/docker)