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Docker Self-hosted Azure Pipeline Agents

This is a starter for a docker based Self-hosted Azure Pipeline Agents.

This is an alternative to Microsoft Hosted Agents.

Based on Run a self-hosted agent in Docker.

Be aware of Common Pitfalls of using Self-Hosted Build Agents.

Capabilities

Name description
php 8.1 install-php-8.1.sh
npm npm 8
curl
node.js node 16
git

Setup .env

In the examples below, replace {your-organisation-name} with your actual Azure DevOps organization name.

Copy .env.sample to .env file

Change the value for AZP_URL:

AZP_URL=https://dev.azure.com/{your-organisation-name}

Generate a Personal Access Token

Go to th Personal Access Tokens page in your Azure DevOps Organization.

Ex. https://dev.azure.com/{your-organisation-name}/_usersSettings/tokens

Create a new Personal access token with following permissions:

  • Build (Read & execute)
  • Code (Full)
  • Code (Status)
  • Environment (Read & manage)
  • Packaging (Read, write, & manage)
  • Pipeline Resources (Use and manage)
  • Release (Read, write, execute, & manage)
  • Secure Files (Read, create, & manage)
  • Service Connections (Read & query)
  • Test Management (Read & write)
  • Pull Request Threads (Read & write)

Paste the token in your .env file:

AZP_TOKEN={replace-with-your-personal-access-token}

Choose your target architecture

By default, this Dockerfile targets arm64 since I tested it on a MacOS machine with M1 architecture. You may need to change architecture depending on the machine you want to run the runners from.

In Dockerfile, you may want to change the TARGETARCH value.

Ex.

# Can be 'linux-x64', 'linux-arm64', 'linux-arm', 'rhel.6-x64'.
ENV TARGETARCH=linux-x64

Cleanup and start all

This command will :

  • cleanup existing agents images and their volumes
  • build the runner docker image
  • start the agents defined in docker-compose.yml
./fresh-start.sh

Check your agents in https://dev.azure.com/{your-organisation-name}_settings/agentpools?poolId=1&view=agents

The individuals steps are found below.

Build the image

./build-image.sh

(Optional) change the agent pool name

By default, the agents are created for the Default agent pool.

You can change it with the AZP_POOL in the .env file

AZP_POOL=Default

(Optional) add of remove agents instances in docker-compose.yml

By default, 3 agents are defined in the docker-compose.yml file

Each of them has a volume mounted in an agent* directory.

If you want to add more agents, don't forget to change the volume for /azp mount point and the agent name in environment variable AZP_AGENT_NAME

services:
  agent1:
    image: dockeragent:latest
    volumes:
      - ./start.sh:/azp/start.sh
      # Change the directory for this agent
      - ./agent1/:/azp
    env_file:
      - .env
    environment:
      # Change the name of this agent
      - AZP_AGENT_NAME=agent1-docker

Start the agents

./start-agents.sh

Stop the agents

./stop-agents.sh

Cleanup agents

Stops agents and removes volumes and data.

./cleanup-agents.sh

Extend your runner image with new capabilities

You may need to run other tools than the already available ones.

To do so, add installation scripts into the Dockerfile.

You can take inspiration in the official Microsoft hosted runners.

For example in our case, we adapted the php installer script to make our own install-php-8.1.sh

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