Docker uses root partition, might need more storage space

installation
8

I did this for free codecamp:

volumes:
  - volume:
      host: /var/discourse/shared/standalone
      guest: /shared
  - volume:
      host: /var/discourse/shared/standalone/log/var-log
      guest: /var/log
  - volume:
      host: /var/postgres_data
      guest: /shared/postgres_data

Basically I keep /var/postgres_data in root and then mount /var/discourse/shared/ on the second volume, additionally I put docker containers in /var/discourse/shared/docker

There are many ways of skinning this, just keep postgres_data on the fastest drive and you should be good.

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