[Docker Notes] Docker notes. #tags: docker, notes

Docker_notes.md

Docker Notes

Notes on using Docker in practice.

Override entry point in run command

Add the following option: --entrypoint "/bin/bash"

Access running container

docker exec -it <container-id-or-name> /bin/bash

Docker command for all running containers

Issue a command (for example docker stop) for all running containers:

docker ps --format '{{.Names}}' | xargs docker stop

Docker command for any container (running or otherwise)

docker container ls -a --format '{{.Names}}' | xargs docker rm

Docker system

Get system events for the last hour:

docker system events --since='1h'

Get disk usage:

docker system df

Docker Image / Container Labels

Links

• How to Tag Docker Images with Git Commit Information
• Let’s make your Docker Image better than 90% of existing ones
• Use labels on your Docker images

Inspect Image/Container for Labels

Inspect a container or image for its metadata, filter down to labels with jq.

docker inspect <object-hash-or-name> | jq '.[].ContainerConfig.Labels'

Search logs for all running containers

Search logs for all docker containers for a given string.

SEARCH=<insert search string here>
for id in `docker ps -q`
do 
	echo $id
    docker logs $id |& grep $SEARCH
done

WIP - search docker logs with xargs

This works, but does not specify the container from which the results were found. There is a -t option to xargs, but the grep will strip the output.

docker ps -q | xargs -L 1 -I % docker logs % |& grep <insert search string here>

Links

• Xargs pass input to command that contains a pipe
• Linux and Unix xargs command tutorial with examples