Docker quick start guide

Docker is a quick and efficient tool to deploy and run apps. It allows you to deploy apps in just one command, with a consistent platform and no messy dependency requirements.

Cyberspace Indonesia offers an OpenVZ Docker template based on CentOS 7 allowing you to deploy Docker on your VPS in just one click.

Let's see the commands that docker has, as of version 1.6.2:

    attach    Attach to a running container
build Build an image from a Dockerfile
commit Create a new image from a container's changes
cp Copy files/folders from a container's filesystem to the host path
create Create a new container
diff Inspect changes on a container's filesystem
events Get real time events from the server
exec Run a command in a running container
export Stream the contents of a container as a tar archive
history Show the history of an image
images List images
import Create a new filesystem image from the contents of a tarball
info Display system-wide information
inspect Return low-level information on a container or image
kill Kill a running container
load Load an image from a tar archive
login Register or log in to a Docker registry server
logout Log out from a Docker registry server
logs Fetch the logs of a container
port Lookup the public-facing port that is NAT-ed to PRIVATE_PORT
pause Pause all processes within a container
ps List containers
pull Pull an image or a repository from a Docker registry server
push Push an image or a repository to a Docker registry server
rename Rename an existing container
restart Restart a running container
rm Remove one or more containers
rmi Remove one or more images
run Run a command in a new container
save Save an image to a tar archive
search Search for an image on the Docker Hub
start Start a stopped container
stats Display a stream of a containers' resource usage statistics
stop Stop a running container
tag Tag an image into a repository
top Lookup the running processes of a container
unpause Unpause a paused container
version Show the Docker version information
wait Block until a container stops, then print its exit code

If you need to know more about a command, simply run docker COMMAND --help for more information on a command.

Let's start with installing WordPress. We are going to use Tutum's WordPress image instead of Docker's as it comes bundled with a MySQL server.

docker pull tutum/wordpress

After this is done, we can see that this image is now on our server ready for deployment:

# docker images

REPOSITORY TAG IMAGE ID CREATED VIRTUAL SIZE latest a540e82bd70a 6 weeks ago 492.3 MB

Let's run WordPress. The d flag makes it run as a daemon, and p flag specifies the port to run, in this case 80.

docker run -d -p 80:80 tutum/wordpress 

And that's it! You now have WordPress running on your VPS. You can access it by typing your VPS's IP in the browser, or use your domain name if it is pointed to that IP.

Docker is also surprisingly easy to manage, here are some of the most common commands (there is also a full list of commands above): 
docker ps - list all running apps
docker rename {old} {new} - rename an app
docker start {id} - start an app
docker stop {id} - stop an app
docker rm {id} - remove a docker

Docker has lots more images available for you to deploy, make sure you have a look here:

As always, if you have any queries about your Cyberspace Indonesia service, just let us know. We hope you enjoy using Docker!

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