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How to fix Unifi controller on Docker error /unifi/data/system.properties: Permission denied

Problem:

Your Unifi controller running on docker or docker-compose shows log messages like

unifi_startup.log
controller_1  | [2021-12-29 17:37:26,396] <docker-entrypoint> Starting unifi controller service.
controller_1  | /usr/local/bin/docker-entrypoint.sh: line 97: /unifi/data/system.properties: Permission denied
controller_1  | /usr/local/bin/docker-entrypoint.sh: line 97: /unifi/data/system.properties: Permission denied
controller_1  | /usr/local/bin/docker-entrypoint.sh: line 97: /unifi/data/system.properties: Permission denied
controller_1  | /usr/local/bin/docker-entrypoint.sh: line 97: /unifi/data/system.properties: Permission denied

on startup.

Solution

Fix the permissions of the directory mounted. I have listed

docker-compose-volumes.yml
volumes:
  - ./unifi_data:/unifi/data

in my docker-compose.yml.

Fix the permissions by

fix_unifi_permissions.sh
sudo chown -R 999:999 unifi_data
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