Docker

Best practices for Dockerfiles

• Best practices for writing Dockerfiles

• Dockerfile reference

Dockerfile defines a container

Then build an image from a Dockerfile

$ docker build

Commonly Used Docker Commands

// List all containers
$ docker ps -a 

// List stopped containers
$ docker ps -f "status=exited"

// Remove all stopped containers
$ docker rm $(docker ps -a -q)

// List Docker images
$ docker images

REPOSITORY                TAG                 IMAGE ID            CREATED             SIZE
test1                     latest              fd484f19954f        23 seconds ago      7 B (virtual 4.964 MB)
test                      latest              fd484f19954f        23 seconds ago      7 B (virtual 4.964 MB)
test2                     latest              fd484f19954f        23 seconds ago      7 B (virtual 4.964 MB)

// Remove a docker images by id
$ docker rmi fd484f19954f

// Create a new image from a container’s changes
$ docker commit a5f2a390c452 ssm-env

// Launch several sessions connected to the same container 
// from multiple host terminals.
$ docker exec -it <container> bash