To customise this image first download the 2019 version of the docker file package which will require a 2019 host, and extract the downloaded zip file.
The tools installation has been taken out of the Dockerfile and put into a single install.ps1 file, this is to reduce the number of layers that Docker produces which greatly reduces of overall image size
Make appropriate adjustments but leave start.ps1 script unchanged
Open PowerShell from the extraction location and run the following command:
docker build -t vsts-agent:1.0 .
To create a container from this image and access a powershell prompt run the following command:
docker run --rm -it vsts-agent:1.0 powershell.exe
To create an Azure DevOps Agent from this image run the following command:
docker run -e AZP_URL=? -e AZP_TOKEN=? -e AZP_POOL=? -d vsts-agent:1.0
To avoid having to build an image on every Docker Host, the image should be pushed to a container registry such as Docker Hub or Azure Container Registry. For local networks with limited internet speeds then using a Private Docker Registry could be an option.
Once you have your customised docker files, put them into source control and link them to a pipeline such as this:
