dockerdevopsgithub actionslinuxtutorial

Deploy sem downtime com Docker Compose em VPS OCI usando GitHub Actions

•Rafael Thayto
Deploy sem downtime com Docker Compose em VPS OCI usando GitHub Actions

Primeiro, você precisa ter um VPS Linux (vou usar Ubuntu 22 nesse tutorial).

# Requisitos

# Instalando o Docker Rollout Plugin

É bem simples:

# Create directory for Docker cli plugins
mkdir -p ~/.docker/cli-plugins

# Download docker-rollout script to Docker cli plugins directory
curl https://raw.githubusercontent.com/wowu/docker-rollout/master/docker-rollout -o ~/.docker/cli-plugins/docker-rollout

# Make the script executable
chmod +x ~/.docker/cli-plugins/docker-rollout

# Como usar o Docker Rollout

Rode docker rollout <name> ao invés de docker compose up -d <name> para atualizar um serviço sem downtime.

$ docker rollout -f docker-compose.yml <service-name>

# Workflow GitHub Actions build_and_deploy.yml

Nesse caso estou usando um registry privado no Digital Ocean.

name: CI

# 1
# Controls when the workflow will run
on:
  # Triggers the workflow on push events but only for the master branch
  push:
    branches: [main]

  # Allows you to run this workflow manually from the Actions tab
  workflow_dispatch:
    inputs:
      version:
        description: 'Image version'
        required: true
#2
env:
  REGISTRY: 'registry.digitalocean.com/YOUR_REGISTRY_NAME'
  IMAGE_NAME: 'YOUR_IMAGE_NAME'

#3
jobs:
  build_and_push:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout the repo
        uses: actions/checkout@v4

      - name: Build container image
        run: docker build -t $(echo $REGISTRY)/$(echo $IMAGE_NAME):$(echo $GITHUB_SHA | head -c7) .

      - name: Install doctl
        uses: digitalocean/action-doctl@v2
        with:
          token: ${{ secrets.DIGITALOCEAN_ACCESS_TOKEN }}

      - name: Log in to DigitalOcean Container Registry with short-lived credentials
        run: doctl registry login --expiry-seconds 600

      - name: Remove all old images
        run: if [ ! -z "$(doctl registry repository list | grep "$(echo $IMAGE_NAME)")" ]; then doctl registry repository delete-manifest $(echo $IMAGE_NAME) $(doctl registry repository list-tags $(echo $IMAGE_NAME) | grep -o "sha.*") --force; else echo "No repository"; fi

      - name: Push image to DigitalOcean Container Registry
        run: docker push $(echo $REGISTRY)/$(echo $IMAGE_NAME):$(echo $GITHUB_SHA | head -c7)

  deploy:
    runs-on: ubuntu-latest
    needs: build_and_push

    steps:
      - name: Deploy to Digital Ocean droplet via SSH action
        uses: appleboy/ssh-action@v1.0.3
        with:
          host: ${{ secrets.OCI_HOST }}
          username: ${{ secrets.OCI_USERNAME }}
          key: ${{ secrets.OCI_SSH_KEY }}
          envs: IMAGE_NAME,REGISTRY,{{ secrets.DIGITALOCEAN_ACCESS_TOKEN }},GITHUB_SHA
          script: |
            whoami
            cd ~/app
            pwd
            ls -la
            # Login to registry
            docker login -u ${{ secrets.DIGITALOCEAN_ACCESS_TOKEN }} -p ${{ secrets.DIGITALOCEAN_ACCESS_TOKEN }} registry.digitalocean.com
            # Update the APP image in docker-compose.yml
            sed -i '0,/image:/s|image: .*|image: '$(echo $REGISTRY)'/'$(echo $IMAGE_NAME)':'$(echo $GITHUB_SHA | head -c7)'|' docker-compose.yml
            # Pull the latest image
            docker compose pull
            # Here is the magic docker plugin
            docker rollout -f docker-compose.yml app
            echo "Deployed with success to production"

# Conclusão

Espero que esse tutorial te ajude de alguma forma, tmj!

Rafael Thayto.

Photo by Bernd 📷 Dittrich on Unsplash

Deploy sem downtime com Docker Compose em VPS OCI usando GitHub Actions - Rafael Thayto