web, worker and cache exist on pier. cache was stopped earlier. Put each one in the right state.

See the current state:

Stop the worker. It runs sleep, which ignores SIGTERM, so the stop takes the full timeout:

docker stop worker
docker ps -a --filter name=worker

Start the existing cache container:

docker start cache

Restart the web server and confirm that the file created in it earlier is still there:

docker restart web
docker exec web cat /usr/share/nginx/html/build.txt

docker exec runs a command inside a running container. Lesson 6 covers it.