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 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 22Just one simple command:
dnf upgrade -y docker-io
Step 2: Other Docker CommandsDocker should already be started, but if it isn’t then you can start it with the following command:
systemctl start dockerDocker 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 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