patrickleet/Docker Cheatsheet.md

## Docker Cheatsheet.md

      
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              Docker Cheatsheet.md
            
          
    docker | docker-machine | docker-compose | docker swarm cheatsheet
docker-machine

Used to create VMs that run docker
create

docker-machine create -d virtualbox machinename

Using machine you created as target
eval $(docker-machine env machinename)

remove

docker-machine rm -f machinename

docker

build

docker build -t your-image-name .

docker-compose equivalent:
docker-compose-test-local.yml
app:
  build: .
  image: your-image-name

docker-compose -f docker-compose-test-local.yml build app
list images

docker images

docker-compose equivalent:
docker-compose ps
docker-compose

Dependencies

docker-compose-test-local.yml
staging-dep:
  image: your-image-name
  ports:
  - 8080:8080
  depends_on:
  - db

db:
  image: mongo

docker-compose -f docker-compose-test-local.yml up -d staging-dep
Running tests

docker-compose-test-local.yml
staging:
  extends:
    service: unit
  environment:
    - HOST_IP=localhost:8080
  network_mode: host
  command: bash -c "npm i && npm test"

docker-compose -f docker-compose-test-local.yml run --rm staging

Stop and Remove running services

docker-compose -f docker-compose-test-local.yml down

Running a Docker Registry

docker-compose-test-local.yml
registry:
  container_name: registry
  image: registry
  ports:
    - 5000:5000
  volumes:
    - .:/var/lib/registry
  restart: always

docker-compose -f docker-compose-local.yml up -d registry

Pull and push images from Docker Registry

Docker uses a naming convention to decide where to pull and push images from. If the name is
prefixed with an address, the engine will use it to determine the location of the registry. Otherwise,
it assumes that we want to use Docker Hub. Therefore, the first command pulled the alpine image
from Docker Hub.
The second command created a tag of the alpine image. The tag is a combination of the address of
our registry (localhost:5000) and the name of the image. Finally, we pushed the alpine image to
the registry running on the same server.
# pull from docker hub
docker pull alpine

# tag an image
docker tag alpine localhost:5000/alpine

# push image to registry 
docker push localhost:5000/alpine

confirm images are persisted on host

ls -1 docker/registry/v2/repositories/alpine/

The output is as follows.
_layers
_manifests
_uploads