Docker is a container-based software framework for automating deployment of applications. “Containers” are encapsulated, lightweight, and portable application modules.
Docker was only available on Ubuntu. Nowadays, it is possible to deploy docker on RHEL based systems (e.g. CentOS) and others as well.
Installation of Docker
Install Docker by installing the docker-io package:
apt-get updateapt-get -y install docker.ioLink and fix paths with the following two commands:
ln -sf /usr/bin/docker.io /usr/local/bin/dockersed -i '$acomplete -F _docker docker' /etc/bash_completion.d/docker.io
Configure Docker to start when the server boots:
update-rc.d docker.io defaults
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Download a Docker Container
Download the fedora Docker image
docker pull ubuntu
Run a Docker Container
-To set up a basic ubuntu 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 ubuntu container.
docker run -i -t ubuntu /bin/bash
To disconnect from the shell without exiting use the escape sequence Ctrl-p + Ctrl-q.
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