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Init

  • docker run hello-world - run container from hello world image

Samples

Application

cat > app.js <<EOF
const http = require('http');

const hostname = '0.0.0.0';
const port = 80;

const server = http.createServer((req, res) => {
    res.statusCode = 200;
      res.setHeader('Content-Type', 'text/plain');
        res.end('Hello World\n');
});

server.listen(port, hostname, () => {
    console.log('Server running at http://%s:%s/', hostname, port);
});

process.on('SIGINT', function() {
    console.log('Caught interrupt signal and will exit');
    process.exit();
});
EOF

Dockerfile

cat > Dockerfile <<EOF
# Use an official Node runtime as the parent image
FROM node:6

# Set the working directory in the container to /app
WORKDIR /app

# Copy the current directory contents into the container at /app
ADD . /app

# Make the container's port 80 available to the outside world
EXPOSE 80

# Run app.js using node when the container launches
CMD ["node", "app.js"]
EOF

Build

  • docker images - list all downloaded images
  • docker build -t node-app:0.1 . - build image from sources with with tag node-app:0.1
  • docker rm my-app - remove image

Run

  • docker ps - list all running containers
  • docker ps -a - list all containers including all which are stopped
  • docker run -p 4000:80 --name my-app node-app:0.1 - running container in attached mode
  • docker run -p 4000:80 --name my-app -d node-app:0.1 - running container in detached mode (in background)
  • docker stop my-app - stop container

Debug

  • docker logs <container-id> - displays logs
  • docker logs -f <container-id> - displays logs with follow
  • docker exec -it <container-id> /bin/bash - “enter” container (ssh replacement)
  • docker inspect <container-id>
  • docker ps --format='\t' - outputs all running container and label with key pl.xperios.project

Publish

  • docker tag node-app:0.2 gcr.io/[project-id]/node-app:0.2 - create new image with new tag from existing one
  • gcloud docker -- push gcr.io/[project-id]/node-app:0.2 - push image to the gcr repository

To push images to your private registry hosted by gcr, you need to tag the images with a registry name. The format is [hostname]/[project-id]/[image]:[tag]. For gcr:

  • [hostname] is gcr.io
  • [project-id] is your project’s ID
  • [image] is your image name
  • [tag] is any string tag of your choice. If unspecified, it defaults to “latest”.

Clean up

  • docker system df - docker disk usage
  • docker stop $(docker ps -a -q) - stop all containers
  • docker rm $(docker ps -a -q) - delete all containers
  • docker rmi $(docker images -q) - delete all images