Docker container, images, networks management is easy with the `prune` command which is available for all types of Docker artifacts (see https://stackoverflow.com/a/32723127/4964553 & https://docs.docker.com/config/pruning/#prune-images & https://docs.docker.com/engine/reference/commandline/system_prune/#filtering). 

#### remove all local Docker containers, that are older than
docker container prune --filter "until=48h"

#### remove all local Docker images, that are older than
docker image prune -a --filter "until=2020-10-25"


#### run multiple commands with only one single docker run
docker run --rm -v "$PWD":/usr/src/app -w /usr/src/app ruby:2.5 bash -c "bundle install; bundle exec jekyll build -d public; ls -l"


### su or sudo not working inside container, since you're another user then root
errors like 
```
$ su root
su: must be suid to work properly
```
simply use --user root while doing docker exec -it:
`docker exec -it --user containerId bash`


### Install ssh and scp to Alpine Docker Container
```
# optinally add proxy
export HTTP_PROXY=http://proxy.your.lan:8080
export HTTPS_PROXY=http://proxy.your.lan:8080
apk update
apk add openssh
```

### local root erlangen per Docker

docker run -it --rm \
    --volume $(pwd):/build \
    --workdir /build \
    use_some_image bash

### Docker Hub Badge

```
[![Dockerhub badge](http://dockeri.co/image/aveltens/docker-testinfra)](https://hub.docker.com/r/aveltens/docker-testinfra)
```