Multiple instances

[aspearman]

I'm working on deploying Foundry to AWS Elastic Beanstalk (open source!) and I'm wondering if it will work for me to have this container scale to multiple instances. Beanstalk occasionally updates its Docker version so updating that automatically without disrupting service requires two instances to run at a time. I'm also generally curious as to whether I could scale this application to multiple instances all using the same world.

Seems like this answer points towards running more than one instance being a bad idea.

I'm planning on mounting an Elastic Filesytem (EFS) volume to the container. Will the different instances fight over the same files while read/writing and cause issues?

I'll also mention Docker Swarm in this question for people searching questions in the future.

Thanks!

[felddy]

Good question. I think you did find the answer in #166. It is my understanding that FoundryVTT assumes that the data directory is its own. If I recall correctly it does implement some locking. Opening the same world in two FoundryVTT instances is almost certainly going to cause some heartburn.

I couldn't find anything specifically in the FoundryVTT documentation about user data locking or access.
It's a pretty frequent topic on the Discord. Here is a sample response from a couple of days ago emphasizing separate user data paths for instances.

If you manage to get this working I'd be keen to know. Also, thanks for Open Sourcing your work!

[aspearman]

Thanks for looking into this. If I get the chance to try out multiple containers, I'll try to come back with some answers, but will assume that it's not built for that for now.

[wanoo]

Hi,

If it's help some coming here, i used to run several instances of foundry with docker compose and sharing all the data to facilitate upgrade.

version: "3"
services:

  foundry-sw:
    container_name: foundry-sw
    image: felddy/foundryvtt:release
    hostname: Ganesha-sw
    init: true
    volumes:
      - foundry-datas:/data/Data
      - foundry-config1:/data/Config
      - foundry-logs1:/data/Logs
      - foundry-cache:/data/container_cache
    environment:
      - FOUNDRY_WORLD=star-wars
      - FOUNDRY_USERNAME=whoiam
      - FOUNDRY_PASSWORD=loremipsumpassword
      - FOUNDRY_ADMIN_KEY=loremipsumpassword
      - FOUNDRY_HOSTNAME=rpg.myhost.com
      - FOUNDRY_ROUTE_PREFIX=star-wars
      - FOUNDRY_PROXY_SSL=true
      - FOUNDRY_PROXY_PORT=443
      - FOUNDRY_LICENSE_KEY=myKey
      - FOUNDRY_MINIFY_STATIC_FILES=true
    restart: unless-stopped
    networks:
      web:
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.rpgrootsw.entrypoints=https"
      - "traefik.http.routers.rpgrootsw.rule=Host(`rpg.myhost.com`) && PathPrefix(`/star-wars`)"
      - "traefik.http.routers.rpgrootsw.tls.certresolver=myresolv"
      - "traefik.http.services.rpgrootsw.loadbalancer.server.port=30000"

  foundry-dnd5:
    container_name: foundry-dnd5
    image: felddy/foundryvtt:release
    hostname: Ganesha-dnd
    init: true
    volumes:
      - foundry-datas:/data/Data
      - foundry-config2:/data/Config
      - foundry-logs2:/data/Logs
      - foundry-cache:/data/container_cache
    environment:
      - FOUNDRY_WORLD=dnd5
      - FOUNDRY_USERNAME=whoiam
      - FOUNDRY_PASSWORD=loremipsumpassword
      - FOUNDRY_ADMIN_KEY=loremipsumpassword
      - FOUNDRY_HOSTNAME=rpg.myhost.com
      - FOUNDRY_ROUTE_PREFIX=dnd5
      - FOUNDRY_PROXY_SSL=true
      - FOUNDRY_PROXY_PORT=443
      - FOUNDRY_LICENSE_KEY=myKey
      - FOUNDRY_MINIFY_STATIC_FILES=true
    restart: unless-stopped
    networks:
      web:
    labels:
      - "traefik.enable=true"
      - "traefik.http.routers.rpgrootdnd5e.entrypoints=https"
      - "traefik.http.routers.rpgrootdnd5e.rule=Host(`rpg.myhost.com`) && PathPrefix(`/dnd5`)"
      - "traefik.http.routers.rpgrootdnd5e.tls.certresolver=myresolv"
      - "traefik.http.services.rpgrootdnd5e.loadbalancer.server.port=30000"

volumes:
  foundry-config1:
  foundry-config2:
  foundry-logs1:
  foundry-logs2:
  foundry-cache:
  foundry-datas:
  
networks:
  web:
    external: true