Assignment Day 2 – Explain docker update & docker wait commands with example

The docker update command dynamically updates container configuration. We can use this command to prevent containers from consuming too many resources from their Docker host

eg : docker update –cpu-shares 512 219444e11a87

docker inspect 219444e11a87

We can check the value for CPU share to be 512

docker wait

Start a container in the background.

$ docker run -dit –name=my_container ubuntu bash

Run docker wait, which should block until the container exits.

$ docker wait my_container

In another terminal, stop the first container. The docker wait command above returns the exit code.

$ sudo -s

$ docker stop my_container

This is the same docker wait command from above, but it now exits, returning 0.

$ docker wait my_container