Introduction to Docker

“Introduction to Docker”

Pengantar

Docker adalah platform terbuka untuk mengembangkan, mengirimkan, dan menjalankan aplikasi. Dengan Docker, Anda dapat memisahkan aplikasi dari infrastruktur Anda dan memperlakukan infrastruktur Anda seperti aplikasi yang dikelola. Docker membantu Anda mengirimkan kode lebih cepat, menguji lebih cepat, menerapkan lebih cepat, dan mempersingkat siklus antara menulis kode dan menjalankan kode.

Praktikum

Task 1. Hello world

• Buka Cloud Shell

docker run hello-world

• Run Image

docker images
docker run hello-world
docker ps
docker ps -a

Task 2. Build

• Buat Folder baru

mkdir test && cd test

• Buat Dockerfile

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

• Buat node app

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

• Build app

docker build -t node-app:0.1 .

• Cek list image

docker images

Task 3. Run

• Run image

docker run -p 4000:80 --name my-app node-app:0.1

• test app

curl http://localhost:4000

• stop and remove

docker stop my-app && docker rm my-app

• Run Container in the background

docker run -p 4000:80 --name my-app -d node-app:0.1
docker ps

• Cek log

docker logs [container_id]

• Modify app

cd test

-- edit app.js

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

• build app

docker build -t node-app:0.2 .

• run container

docker run -p 8080:80 --name my-app-2 -d node-app:0.2
docker ps

• test container

curl http://localhost:8080
curl http://localhost:4000

Task 4. Debug

docker logs -f [container_id]

docker exec -it [container_id] bash

docker inspect [container_id]

docker inspect --format='{{range .NetworkSettings.Networks}}{{.IPAddress}}{{end}}' [container_id]

Task 5. Publish

Create the target Docker repository

• Klik Navigation Menu, under CI/CD navigate to Artifact Registry > Repositories
• Click Create Repository.
• Specify my-repository as the repository name
• Choose Docker as the format
• Under Location Type, select Region and then choose the location us-central1 (Iowa)
• Click Create

Configure authentication

gcloud auth configure-docker us-central1-docker.pkg.dev

Push the container to Artifact Registry

• cek project

gcloud config list project

docker build -t us-central1-docker.pkg.dev/[project-id]/my-repository/node-app:0.2 .

• Cek list image

docker images

• push to repo

docker push us-central1-docker.pkg.dev/[project-id]/my-repository/node-app:0.2

• Klik Navigation Menu, under CI/CD navigate to Artifact Registry > Repositories.
• Klik my-repository

Test the image

• stop and remove all container

docker stop $(docker ps -q)
docker rm $(docker ps -aq)

• remove all docker image

docker rmi node-app:0.2 gcr.io/[project-id]/node-app node-app:0.1
docker rmi node:lts
docker rmi $(docker images -aq) # remove remaining images
docker images

• Pull image and run it

docker pull us-central1-docker.pkg.dev/[project-id]/my-repository/node-app:0.2
docker run -p 4000:80 -d us-central1-docker.pkg.dev/[project-id]/my-repository/node-app:0.2
curl http://localhost:4000

Penutup

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