Docker | cheat sheet for rookies

Containers are ‘Applications’ – they consists of images.
Include so called Volumes to keep persistent data and exchange environment variables between containers.

Dangled images are images included in still existing older versions of your container.

Unused images are totally orphaned images.

Avoid –link parameter – it’s deprecated.
Use Volumes instead.

Connecting volumes: -v
Environment variables: -e
Ports: -p

Managing Volumes:
Creating:
docker volume create --opt o=size=1024m --opt type=ext4 --opt device=DEVONHOST MyVolume

Attention!
The local driver does not support volume size limitation!

Other stuff:

docker volume create Create a volume
docker volume inspect Display detailed information on one or more volumes
docker volume ls List volumes
docker volume prune Remove all unused local volumes
docker volume rm Remove one or more volumes


Creating and running containers:

 # docker run -d --name VolCon -p HOSTPORT:CONTAINERPORT -e MYENV=LALALA -v HOSTPATH:CONTAINERPATH:ro  xxaxxelxx/lsssd_volumecontrol

Example:

 # docker run -d --name VolCon -p 65522:22 -e MYENV=LALALA -v MyVolume:/incuded_volume -v /sys:/host/sys:ro  xxaxxelxx/lsssd_volumecontrol

Stopping/start/restart containers:
docker stop/start/restart CONTAINERNAME/CONTAINERID

Managing containers:
List running containers and show all infos:
docker ps

List running containers and show id only:
docker ps -q

List stopped containers and show all infos:
docker ps -a

List stopped containers and show is only:
docker ps -aq

List images used by existing containers showing all parameters:
docker images

List images used by existing containers showing id only:
docker images

List ALL images used and unused by existing containers showing all parameters:
docker images -a

List ALL images used and unused by existing containers showing id only:
docker images -aq

Delete containers:
docker rm CONTAINERNAME/CONTAINERID

Delete images:
docker rmi ID

Using xarg example:
docker images -aq | xarg docker rmi

Delete unused images:
docker image prune -af

Delete stopped containers and dangling images:
docker system prune

Modify existing containers:
docker update --restart=always CONTAINERNAME

Arguments limiting a containers resources:
--blkio-weight uint16
--cpu-period int
--cpu-quota int
--cpu-rt-period int
--cpu-rt-runtime int
-c, --cpu-shares int
--cpus decimal
--cpuset-cpus string
--cpuset-mems string
--kernel-memory bytes
-m, --memory bytes
--memory-reservation bytes
--memory-swap bytesenable unlimited swap
--pids-limit int
--restart string