```
#------------------------
# check container
#------------------------
$ docker ps

#------------------------
# check all containers
#------------------------
$ docker ps -a

#------------------------
# delete container
#------------------------
$ docker rm <container id>

#------------------------
# delete all containers
#------------------------
$ docker rm `docker ps -a -q`

#------------------------
# check images
#------------------------
$ docker images

#------------------------
# delete image
# - will report error if image does not exists
#------------------------
$ docker rmi <image id>

#------------------------
# force delete image
#------------------------
$ docker rmi -f <image id>

#------------------------
# delete all images
#------------------------
# - before 1.12
$ docker rmi `docker images -q`

# - after 1.13
$ docker image prune


#------------------------
# docker status
#------------------------
$ docker stats

#------------------------
# check mount status
#------------------------
$ docker inspect -f "{{ .Mounts }} <container id>

# e.g.
$docker inspect -f "{{ .Mounts }}" 8a3da5488a83
[{bind  /Users/kuniyasu/Work/docker/docker-cluster/node2/data /usr/share/elasticsearch/data  rw true rprivate}]


```
#------------------------
# login to the container as root
#------------------------
$ docker exec -it --user root <container id> /bin/bash

#------------------------
# Remove unused data, it will prompt you for the following:
# WARNING! This will remove:
#        - all stopped containers
#        - all networks not used by at least one container
#        - all dangling images
#        - all build cache
#------------------------
$ docker system prune

#------------------------
# copy file between native OS to docker
#------------------------
$ docker cp /tmp/kibana.yml <container id>:/usr/share/kibana/config/kibana.yml

#------------------------
# add modified docker image to local for future usage.
#------------------------
docker commit -m 'comment' <container id> my_repo:tag

# Some files to modify the init script for docker
/usr/local/bin/docker-entrypoint.sh
/usr/share/logstash/bin/system-install
/usr/share/logstash/config/startup-options

```
```