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Docker

Notes

$ docker start <CONTAINER ID>
$ docker exec -it <CONTAINER ID> /bin/bash

docker-machine path

~/.docker/machine/machines

Commands

$ docker-machine
$ docker-machine create -drive virtualbox your-machine-name
$ docker-machine ls
$ docker-machine env your-machine-name
$ eval "$(docker-machine env your-machine-name)"
$ docker images
$ docker run your-image-name

remove <none> images

ref

$ docker rmi $(docker images | grep "^<none>" | awk "{print $3}")

Another better way: ref

$ docker images | grep "<none>" | awk '{print $3}' | xargs docker rmi

docker working flow

  1. $ docker-machine start your-machine-name
  2. $ eval "$(docker-machine env your-machine-name)" # Eval docker-machine's env so that your OSX can figure out where to find docker.
  3. $ docker pull ubuntu:14.04
  4. $ docker run -t -i ubuntu:14.04 /bin/bash

  5. do somethine in your image

  6. $ docker commit <yourDockerImageID> <username>/<imagename>:<imagetag> # If you forget image id, you can use $ docker pa -a to find it out.

show containers

to show only running containers

$ docker ps

to show all containers

$ docker ps -a

to show all containers' ids

$ docker ps -aq

remove all containers

ref (qkrijger's answer is working for me)

$ docker rm `docker ps --no-trunc -aq`

Mount a host directory as a data volume

ref
NOTE Currently(docker version 1.8.1) can only touch files under /Users on Mac OSX.
Use -v to mount as a data volume.

$ docker run -ti -v $PWD/gowiki:/root/go/src/github.com/iamken1204/gowiki kettan/gobuntu:0.0.6 /bin/bash

Link to go web app in docker container

  • First we need to find out where is out docker-machine's ip:
$ docker-machine ls
NAME      ACTIVE   DRIVER       STATE     URL                         SWARM
default   *        virtualbox   Running   tcp://192.168.99.100:2376
  • Then run our container, assign its port 8000 reflect to host's 8000.
$ docker run --rm -ti -p 8000:8000 -v $PWD/gowiki:/root/go/src/github.com/iamken1204/gowiki kettan/gobuntu:0.0.6 /bin/bash
$ cd /root/go/src/github.com/iamken1204/gowiki
$ ./wiki
  • Finally, we can visit 192.168.99.100:8080 to see our web app!

Action options

  • run
    • -i Keep STDIN open even if not attached.
    • -t Allocate a pseudo-TTY.
    • --rm | --rm=true Delete container when it exits.
    • --name= Assign container's name.
    • -v Bind mount a volume.
    • -w | --workdir= Assign working directory in a container.

Assume -it when you want to use bash in container.

How to use exec to execute commands in background containers.

  • format
$ docker exec -it [container-id] [command]
  • example
$ docker exec -it mariadb bash