Unique ENV var value per swarm replica instance

Docker Engine Swarm
10

This also works in docker-compose files here’s an example of how I did it with Visual Studio Team Services agents

# sudo docker stack deploy -c vsts-agent.yml --prune vsts-agent
version: '3.4'
services:
  agent:
    image: microsoft/vsts-agent:ubuntu-16.04-docker-17.12.0-ce-standard
    environment:
    - VSTS_ACCOUNT=trajano
    - VSTS_AGENT={{.Task.Name}}
    - VSTS_POOL=Default
    - TFS_HOST=trajano.visualstudio.com
    - VSTS_TOKEN=secret
    volumes:
    - /var/run/docker.sock:/var/run/docker.sock:ro
    deploy:
      replicas: 2

A list of template values are here

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