Summary - First container

Combine run, ps, stop and logs to manage a container.

Summary: the first container

In this group:

docker run image command: creates a container from an image; the container stops when the main process ends.
-d starts it in the background; docker exec runs a command in a running container.
docker ps (-a, -q, --filter, --format) lists containers.
stop shuts down gracefully, kill kills immediately, rm removes, start starts again.
docker logs shows stdout/stderr (-f, --tail, --since).

docker run -d --name web nginx
docker logs -f --tail 10 web
docker stop web && docker rm web

Exercise A container's life cycle

Write four commands: start a container named web from nginx in the background; show the last 10 log lines; stop the container; remove the container.

Show example solution

docker run -d --name web nginx
docker logs --tail 10 web
docker stop web
docker rm web

Test yourself

Which stops all running containers with one command?
- docker stop $(docker ps -q)
- docker stop --all-running
- docker rm -a
- docker ps --stop
Show answer

docker stop $(docker ps -q) — docker ps -q gives the IDs; stop takes all of them.

Pass the IDs to the command.

docker rm $(docker ps -a ____)

Show answer

docker rm $(docker ps -a -q)

Match.

docker run

New container
docker exec

Command in an existing container
docker logs

Output records
docker rm

Removal

Next lesson: What is a Dockerfile?

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