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Notes about containers

Exiting the container

1. The container can be exited by typing exit from the active container.
2. A container can be stopped from a terminal on the host system

• Once exited all data and changes made within the container will be lost. Hence, if necessary, it is important to
  • Push any code changes back to a repo
  • If data is required either set-up a data volume or copy the data back to a local machine, using docker cp 

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Executing docker run  will always create a new container, which will be retained if the run command does not include the --rm. This is not ideal and so here are some commands to manage the containers

1. List running containers

   Code Block
   language bash theme Midnight
   docker ps CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d1bd89ccc47f openifs-48r1.1 "bash" 15 hours ago Up 5 seconds beautiful_pasteur

    If no container

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1. is running on your system, then only CAPITAL headings are returned with docker ps 

2. List all containers (running and exited)

   Code Block
   language bash theme Midnight
   docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES d1bd89ccc47f openifs-48r1.1 "bash" 15 hours ago Exited (0) 4 seconds ago beautiful_pasteur

   Notice that the STATUS  is Exited, rather than Up, as in (1)

3. Start an existing container