Docker 101: The Basics
IntroductionDocker is a container-based software framework commonly used for automating deployment of applications. “Containers” are encapsulated, lightweight, and portable application modules.
- These instructions are intended for installing Docker.
- I’ll be working from a Liquid Web Self Managed Fedora 21 server, and I’ll be logged in as root.
Step 1: Install Docker on Fedora 21As a matter of best practice, we’ll update our packages:
yum update -yLet’s install Docker by installing the docker-io package:
yum -y install docker-ioOnce the installation completes, we’ll need to start the Docker daemon:
systemctl start dockerAnd finally, and optionally, let’s configure Docker to start when the server boots:
systemctl enable docker
Step 2: Download a Docker ContainerLet’s begin using Docker! Download the fedora Docker image:
docker pull fedora
Step 3: Run a Docker ContainerNow, 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/bashThat’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