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Docker - Containers - Create a container

Create a contain simply run using docker run + the image name you would like to run + the command to run within the container.

If the image doesn't exist on your local machine, Docker will attempt to fetch it from the public image registry.

It’s important to note that containers are designed to stop once the command executed within them has exited.

For example, if you ran /bin/echo hello world as your command, the container will start, print hello world and then stop:

docker run ubuntu /bin/echo hello world

NOTE: Docker containers stop running as soon as the command they issued is complete, so this example will stop the container when the echo command has displayed “hello world”.

An alternative method is:

docker run -ti ubuntu

-t: Runs a terminal.
-i: Allow us to interact with it.

This allows continuous use of the container until the terminal is exited by running the “exit” command.

When the container is created, it is given its container ID and a randomly-generated name. The command-line prompt will changes to indicate we're inside the container as the root user, followed by the 12 character container ID.

For example:

root@11cc47339ee1:/#