Azure Devops Self-Hosted Agents Docker-Compose

Launch self-hosted agents in Azure DevOps using docker-compose. Although a guide has been provided for self-hosted in Docker, there isn't an example available for running using docker-compose. This repository aims to provide an example of how to accomplish this.

Development

Prerequisites

1. Have Docker for desktop installed on your machine,
2. Have permission to configure agents within your Azure DevOps organisation.

Usage

1. Clone the repository and navigate to the directory,

2. Copy .env.example and create a new .env file and assign environment variable values,

3. Build the agent docker image:

   docker build -t azureagent:latest .

4. Start the agents / services:

   docker-compose -f docker-compose.example.yml up -d,

5. Stop all agents / services:

   docker-compose -f docker-compose.example.yml down --remove-orphans.

Starting the services will launch one agent and one deployment agent and should be available for usage, within their respective pools.

Environment variables

The following environment variables are used for the services.

Environment variable	Description	Default value	Required?
AZP_URL	The URL of the Azure DevOps or Azure DevOps Server instance.	N/A	Yes
AZP_TOKEN	Personal Access Token (PAT) with Agent Pools (read, manage) scope, created by a user who has permission to configure agents, at AZP_URL.	N/A	Yes
AZP_AGENT_NAME	Agent name.	The container hostname	Optional
AZP_POOL	Agent pool name.	Default	Optional
AZP_WORK	Work directory	_work	No
DEPLOYMENT_AGENT	Indicate if the agent should be configured as a deployment agent by setting the value as "true"	N/A	Optional
DEPLOYMENT_POOLNAME	The deployment pool that the agent should be added to, if DEPLOYMENT_AGENT value is "true"	N/A	Optional

Note: AZP_POOL does not need to be specified, if the agent is a deployment agent. But instead a valid deployment pool must already be created within the organisation.

Installing additionally command line utilities

If you're running into issues installing additional command line tools through your pipeline. It's possible to update the Dockerfile to install the tool during the docker build of the image. For example ArchiveFiles@2 may fail due to zip due to command not found error, in which case you can add it to the list of apt-get install so you can use the zip command with the Azure Pipeline task.

The proposed option assumes that that all agents need zip cli installed. Alternatively, If there is only one job that requires a command, you can install it via bash script in the pipeline e.g. apt-get install zip -y --allow-change-held-packages, this should download and install the cli.

Failed to fetch packages during job run

When attempting to fetch new or updated packages during a job run but fails due to:

Err:4 http://ports.ubuntu.com/ubuntu-ports focal-updates/main arm64 binutils-common arm64 2.34-6ubuntu1.5
  404  Not Found [IP: 185.125.190.36 80]

This happens because a cached Docker is used. The cached image wouldn't have the latest repository information and requires having to rebuild the image again.