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Docker

Reference: Docker Commands

docker info
docker inspect
docker exec -it
docker run -d
docker ps -a
docker stop [my_container]
docker rm [my_container]
docker rmi [docker_image]
docker volume rm [my_volume]
docker volume create [my_volume]
docker volume ls
docker volume inspect [my_volume]
docker container ls -aq # list all containers

Tags

nginx # default to latest
nginx:latest # specifically use tag latest
centos:centos6 # pull centos 6 base image

Lifecycle Management

Run in detached mode (daemon mode), background

docker run -d --name=nginx nginx:latest

Restart Container

docker restart nginx

Execute a command in a container without affecting the running process

#  Interactive, attach with a shell.
docker exec -it nginx /bin/bash

List processes

docker ps # Running Processes
docker ps -a # Running and Stopped Processes

remove images, when no containers are based upon it

docker rmi centos:centos6

docker image prune # remove all currently unused imaged docker image prune -a # clear everything

Remove containers

docker rm nginx:old
docker system prune # remove all stopped containers, images, unused networks

Stop all containers. Remove all stopped containers, using bash command substitution

docker container stop $(docker container ls -aq) # stop all containers docker container rm $(docker container ls -aq) # remove all stopped containers docker rmi -f $(docker images -aq)

Docker Inspect

get info about container

docker inspect

get ip address of container

docker inspect nginx:latest | grep IPAddr

Ports and Volumes

volumes

docker volume ls docker volume rm docker volume prune

ports

In docker-compose expose -> reveal ports to the docker environment ports -> expose ports to docker and to the host system (i.e. publish the ports)

Bind ports

# docker run -d -p HOSTPORT:CONTAINERPORT
docker run -d -p 8080:80 --name=WebServer nginx:latest

Create a mount point in a container

# docker run -d -p 8080:80 --name=webserver -v HOSTVOLPATH:CONTAINERVOLPATH nginx:latest
docker run -d -p 8080:80 --name=webserver -v /home/user/www:/usr/share/nginx/html nginx:latest

BUILDING, using a Dockerfile

# Execute in directory with dockerfile, or define path
docker build -t dzoladz/ubuntu .

Dockerfile

  • each step in the build process is a new container
  • try to combine mulitple RUN commands when possible

RUN * applies to the base images
CMD * applies to the container instantiated on the base image
EXPOSE * expose container ports to host system

Build a container using a Dockerfile and tag it

docker build -t keycloak-proxy .

docker run -d -p 80:80 -p 443:443 --name=keycloak-proxy keycloak-proxy:latest

# Reload Nginx config in running container
docker exec <container name> nginx -s reload

Applications

Metabase

# NOTE: this will run Metabase without any persistent storage for the application.
docker run -d -p 3000:3000 --name metabase metabase/metabase

ownCloud

docker run -d -p 8080:80 --name owncloud --mount source=/Users/Derek/docker/owncloud,target=/var/www/html owncloud:8.1

networks

docker network ls # list them all docker network prune -a # get rid of them all