docker auto label

docker-auto-label.md

Auto Label

This container puts a label on each machine based on a config that matches service names. If the service is running the label gets a 1 and if the label get as 0 its not running. this can be used with constraints to either locate serices on a node with another service OR make sure a service doesn't land on a node with another service

I would love to find a better version of this that does this without the need for the manual config file (you can use a file bindmount instead of a config if you prefer)

Swarm Consideration

State is all read-only in a config You need this to run on all nodes.

Example Stack

version: "3.7"
services:
  dockerautolabel:
    build: .
    image: davideshay/dockerautolabel:latest
    volumes:
      - /var/run/docker.sock:/var/run/docker.sock
    configs:
      - source: dockerautolabel_config
        target: /config/servicelist.txt
    deploy:
      mode: replicated
      replicas: 1    
      placement:
        constraints: [ node.role == manager]

configs:
  dockerautolabel_config:
    external: true
    

Example Config (this is my real one as of writing this)

This is the name of the service when running followed by what you want the label to say use sudo docker service ls to get the names

adguard_adguard1,running_adguard1
adguard_adguard2,running_adguard2
adguard_adguardhome-sync,running_adguardhome-sync
agent_agent,running_agent
apprise_apprise-api,running_apprise-api
cloudflare-ddns_cloudflare-ddns,running_cloudflare-ddns
cluodflared_portainer-tunnel,running_portainer-tunnel
dockerproxy_dockerproxy,running_dockerproxy
infinitude_infinitude,running_infinitude
mqtt_mosquitto,running_mosquitto
npm_app,running_npm
npm_db,running_npm_db
oauth_oauth2-proxy,running_oauth2-proxy
portainer_portainer,running_portainer
shepherd_shepherd,running_shepherd
swag_swag,running_swag
unifiapibrowser_unifiapibrowser,running_unifiapibrowser
watchtower_watchtower,running_watchtower
wordpress_db,running_wordpress_db
wordpress_wordpress,running_wordpress

Example of how i use this with adguard to make sure adguard 1 and 2 don't run on the same node EVER (which causes failure conditions)

...
adguard2:
    image: 'adguard/adguardhome:latest'
    restart: always
    volumes:
      - work2:/opt/adguardhome/work
      - config2:/opt/adguardhome/conf
    networks:
      - adguard2-mvl
      - adguard_sync
    deploy:
      mode: replicated
      replicas: 1
      placement:
        constraints: [node.labels.running_adguard1 == 0]
        
...