Restarting containers in Docker - Cheat Sheet & Quick Revision

Recall & Review

beginner

What command is used to restart a running Docker container?

Use docker restart <container_name_or_id> to stop and then start a container again.

beginner

What happens when you run docker restart on a container?

Docker stops the container if it is running, then starts it again. It does not apply any changes made to the container's configuration or environment.

intermediate

How can you restart all running Docker containers at once?

You can use docker restart $(docker ps -q) to restart all running containers by passing their IDs to the restart command.

intermediate

What is the difference between docker restart and docker stop followed by docker start?

docker restart combines stopping and starting in one command, while docker stop and docker start are two separate commands that achieve the same result.

intermediate

Can you specify a timeout when restarting a Docker container? How?

Yes, use docker restart -t <seconds> <container> to set how long Docker waits before forcibly stopping the container.

Which command restarts a Docker container named 'webapp'?

A docker reload webapp

B docker restart webapp

C docker reset webapp

D docker refresh webapp

The correct command to restart a container is docker restart <container_name>.

What does the -t option do in docker restart -t 5 mycontainer?

A Tests the container before restarting

B Specifies the total restart attempts

C Tags the container with a label

D Sets the timeout in seconds before forcefully stopping the container

The -t option sets the timeout in seconds Docker waits before killing the container.

How can you restart all running containers with one command?

A docker restart $(docker ps -q)

B docker restart --all

C docker restart -a

D docker restart *

Using docker restart $(docker ps -q) restarts all running containers by passing their IDs.

What is the effect of running docker restart on a stopped container?

A It removes the container

B It does nothing

C It starts the container

D It pauses the container

Restarting a stopped container will start it.

Which command sequence is equivalent to docker restart mycontainer?

A docker stop mycontainer && docker start mycontainer

B docker pause mycontainer && docker unpause mycontainer

C docker kill mycontainer && docker run mycontainer

D docker remove mycontainer && docker create mycontainer

Stopping and then starting a container manually is the same as restarting it.

Explain how to restart a Docker container and what happens during the restart process.

Think about what stopping and starting means for a container.

Describe a method to restart all running Docker containers at once and why this might be useful.

Consider how to get all container IDs and use them in one command.