Docker 101: The Basics
IntroductionDocker is a container-based software framework for automating deployment of applications. “Containers” are encapsulated, lightweight, and portable application modules.
- As of June 2014 Docker has officially released v1.0.0.
- These instructions are intended for installing Docker.
- I’ll be working from a Liquid Web Self Managed CentOS 7 server, and I’ll be logged in as root.
Step 1: Installation of DockerAs a matter of best practice we’ll update our packages:
yum -y updateNow let’s install Docker by installing the docker-io package:
yum -y install docker docker-registry
Step 2: Start Docker and Make Sure Docker Starts on BootSet the Docker service to start at boot:
systemctl enable docker.serviceThen start the Docker service:
systemctl start docker.serviceAnd verify your work by checking the status of Docker:
systemctl status docker.service
Step 3: Download a Docker ContainerLet’s begin using Docker! Download the centos Docker image:
docker pull centos
Step 4: Run a Docker ContainerNow, to setup a basic
docker run -i -t centos /bin/bashThat’s it! You’re now using a bash shell inside of a centos 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
docker search centos