docker cheat sheet
Project to start practicing with docker containers and docker-compose. To begin with the learning enviroment run in a console inside the project:
Useful docker commands
Docker images manipulation
Login to docker public registry (docker-hub)
docker login
Pull an image from docker-hub
sudo docker image pull python:3.4-alpine
List all docker images downloaded either from docker-hub or another registry
docker image ls
Remove a docker image
docker image rm <image-id>
Remove a docker image forcefully
docker image rm -f <image-id>
Inspect a docker image
docker image inspect <image-id>:<my-tag>
See size of intermediate images that make up your image
docker image history <image-id>:<my-tag>
Remove one or more docker images
docker rmi <image-id>
Delete all docker images
docker rmi $(docker images -q)
Forcefully delete all docker images
docker rmi $(docker images -q) --force
Export docker image into a tar.gz file
docker save <grupo>/<name>:<version> | gzip -9 > <grupo>_<name>_<version>.tar.gz
Load docker image from a tar.gz file into local repository
gunzip -c -k <grupo>_<name>_<version>.tar.gz | docker load
Remove docker dangling images -> More Info of Dangling images
docker rmi $(docker images -f "dangling=true" -q)
Docker container manipulation
Run a container with interactive processes (like a shell)
docker run -it <image-id>
Run a container with interactive processes (like a shell) in a deattached mode
docker run -d -it <image-id>
Attach a deatacched container -> More Info
docker attach <container-id>
Run a container and share bind mount between host and container
docker run -d -P --name frontend -v /src/webapp:/opt/webapp -v db_volume:/var/db_data frontend
-d Deattached mode
-P Publish all ports exposed in Dockerfile
--name Container name to easily identify it instead of using container id
-v mount /src/webapp directory on host to the /opt/webapp on container
-v create and/or mount db_volume on host to the /var/db_data on container\
frontend Image name
Run a container named friendlyhello in the background (deattached mode) and publish the port 4000 in the host and maps it to port 5000 inside the container
docker run -d -p 4000:5000 friendlyhello
List all running containers
docker ps
docker container ls
docker container ps
List all containers
docker ps -a
Example Output:
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f263b6710fdc friendlyhello "python app.py" 11 seconds ago Up 8 seconds 80/tcp, 0.0.0.0:4000->5000/tcp kind_chaum
List running container IDs
docker container ls -q
List history of containers (Not only just the running ones)
docker container ls --all
Example Output
CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES
f263b6710fdc friendlyhello "python app.py" 3 minutes ago Up 3 minutes 80/tcp, 0.0.0.0:4000->5000/tcp kind_chaum
103ed3c668e1 friendlyhello "python app.py" 18 minutes ago Exited (0) 7 minutes ago infallible_ride
46d16b7d611e friendlyhello "python app.py" 24 minutes ago Exited (0) 18 minutes ago distracted_einstein
9f150bd485c7 hello-world "/hello" 2 hours ago Exited (0) 2 hours ago optimistic_ardinghelli
List containers in quiet mode
docker container ls -aq
Example Output
f263b6710fdc
103ed3c668e1
46d16b7d611e
9f150bd485c7
View approximate size of a running container
docker container ls -s
View approximate size of old containers
docker container ls -a -s
See log of a container
docker logs <container-id>
To see the log output of a running container
docker logs --follow <container-id>
Override entrypoint
docker run --entrypoint <new-entrypoing> <image-id>
Lists all files inside /code/ folder inside container with id “5674f4dd7d27”
docker exec -it 5674f4dd7d27 ls /code/
Start a shell terminal inside the container with id “5674f4dd7d27”
docker exec -i -t 5674f4dd7d27 sh
Stop a running container
docker stop <container-id>
or
docker kill <container-id> (It does not attempt to shut down the process gracefully first)
Stop all running containers
docker stop $(docker ps -aq)
or
docker kill $(docker ps -aq) (It does not attempt to shutdown the process gracefully first)
Remove one or more stopped containers
docker rm <container-id>
Delete all stopped containers
docker rm $(docker ps --filter status=exited -aq)
Docker clean up commands
Check docker used disk space
docker system df
Prune disk space
docker system prune
Clean docker builder cache
docker builder prune -a -f
Docker volumes manipulation
List available volumes
docker volume ls
Example Output:
DRIVER VOLUME NAME
local 55bd8f88e1307ab51f620bbb3b9578ceca8edbf0fee29b1fa2f5c62cad34c193
local jenkins_home
local netbox-docker_netbox-media-files
local netbox-docker_netbox-nginx-config
local netbox-docker_netbox-postgres-data
local netbox-docker_netbox-redis-data
local netbox-docker_netbox-report-files
local netbox-docker_netbox-static-files
Inspect a volume
docker volume inspect jenkins_home
Example Output:
[
{
"CreatedAt": "2019-04-22T12:20:54-03:00",
"Driver": "local",
"Labels": null,
"Mountpoint": "/var/lib/docker/volumes/jenkins_home/_data",
"Name": "jenkins_home",
"Options": null,
"Scope": "local"
}
]
Remove a volume
docker volume rm jenkins_home
Docker networks manipulation
TBC.
Docker services and stack manipulation
List stacks or apps
docker stack ls
Run the specified Compose file
docker stack deploy -c <composefile> <appname>
List running services associated with an app
docker service ls
List tasks associated with an app
docker service ps <service>
Inspect task or container
docker inspect <task or container>
Tear down an application
docker stack rm <appname>
Enable swarm mode on the host
docker swarm init
Enable swarm mode on the host and advertise address 192.168.99.11
docker swarm init --advertise-addr 192.168.99.11
Join a machine in the swarm as worker
docker swarm join --token <token_id> <myvm ip>:<port>
Take down a single node swarm from the manager
docker swarm leave
docker swarm leave --force
List all the nodes in a swarm
docker node ls
Useful docker-compose commands
Build and run your app with compose
docker-compose up
Build and run your app with compose forcing to build images based on a Dockerfile
docker-compose up --build
Stop the application
docker-compose down
Note: docker-compose commands have to be runned inside the directory where docker-compose.yml resides
Useful docker-machine commands
Create a machine called myvm1 (Future node of a swarm cluster)
docker-machine create --driver virtualbox myvm1
Start a machine
docker-machine start myvm1
Stop a machine
docker-machine stop myvm1
Remove a machine
docker-machine rm myvm1
Lists machines (asterisk shows which VM this shell is talking to)
docker-machine ls
Show environment variables and command for myvm1
docker-machine env myvm1
Command to connect shell to myvm1
eval $(docker-machine env myvm1)
Disconnect shell from VMs, use native docker
eval $(docker-machine env -u)
Run commands inside a machine through ssh
docker-machine ssh myvm1 "docker swarm init --advertise-addr <myvm1 ip>"