Docker

ℹ️ The examples here use a mock image wmax641/test-app:latest

Operations

Override / keep running

Useful to keep container running for troubleshooting

# Simple drop into shell via override
docker run -it --entrypoint=/bin/sh wmax641/test-app:latest

# Override entrypoint into `tail -f /dev/null`
docker run -d --entrypoint tail wmax641/test-app:latest -f /dev/null

Get shell into container

docker exec -it <container name/id> /bin/sh

Get Logs

For exited instances - look up history (docker ps -a) to find container name

docker ps             # use '-a' for historical containers
docker logs <container name/id>

Quick multi-kill instances

Change grep to match the instances you want to kill

docker ps | grep "test-app" | awk '{print $1}' | while read line; 
    do docker kill $line; 
done

Build

Build, Tag and then Push

docker build . -t wmax641/test-app:latest
docker push wmax641/test-app:latest

Dockerfile Patterns

See Dockerfile Pattern