Docker Wait and Docker Update explained

DevOps
Posted on | by john_a

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Docker Update

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. With this command, we can place limits on a single container or on many. 

docker update [OPTIONS] <container_name>  Code language: HTML, XML (xml)

Before update cpu shares option –

After update cpu shares option –

Docker Wait

Block until one or more containers stop, then print their exit codes

docker wait <container_name>Code language: HTML, XML (xml)

Example of running docker wait – Start a container in the background.

$ docker run -dit --name=mine ubuntu bash

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

$ docker wait mine

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

$ docker stop mine

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

$ docker wait mine

0