Docker Tips

Docker Tips.md

Categories

Build

docker-compose build .
docker-compose up --detach

Spring Cleaning

To demonstrate how quickly you can fill your disk run these commands;

df -h # display current disk utilisation
docker run -it mysql:5.7 bash -c 'echo "Hello"'
docker run -it amazonlinux:latest bash -c 'echo "Hello"'
docker run -it ubuntu:trusty bash -c 'echo "Hello"'
docker run -it ubuntu:latest bash -c 'echo "Hello"'
df -h # display final disk utilisation

Now that you’ve filled your disk see if you can recover the space using these commands to list and clean layers, images, and containers:

docker ps --all # list all containers
docker images --all # list all images
docker rmi $IMAGE_SHA # remove image,multiple SHAs permitted
docker rm $CONTAINER_SHA # remove a containers image, multiple SHAs permitted
docker system prune --all --force # burn it all down with gusto (use with caution)

docker-compose.yaml

version: '2'
services:
  api:
    build: .
    ports: 
      - "5000:5000" # forward flask port to your desktop (replace as desired)
    depends_on:
      - db # this will cause db to be launched prior to launching this container
    volumes:
      - .:/app # this is an example of a bind mount

  db:
    image: "mysql:5.7"
    ports:
      - "3306:3306" # forward mysql port to your desktop
    environment:
      - MYSQL_ROOT_PASSWORD=secret

Dockerfile

FROM amazonlinux:latest
RUN yum install -y \
    iputils \
    mysql57-devel \
    python27-devel \
    python27-pip