Implementation
In Ubersmith's /usr/local/ubersmith/docker-compose.yml file, there is an rsyslog service defined, which is normally unused. When started, this service creates a socket in:
/usr/local/ubersmith/logs/rsyslog/
The php service, which executes Ubersmith's code, then mounts this socket as a volume and Ubersmith's code is able to send log messages to the syslog daemon.
Configuration
It is possible that upon the initial configuration of this feature, there will be unwanted contents in /usr/local/ubersmith/logs/rsyslog, which should be deleted. After deleting the contents of that directory, execute the following commands in your Ubersmith root:
The following commands will cause a brief interruption of service as the php container will not be online to process requests.
docker-compose rm -sf php rsyslog
docker-compose up -d rsyslog
docker-compose up -d php
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This will create the socket in /usr/local/ubersmith/logs/rsyslog/ and allow the php container to mount it.
These logs will then appear on the main system, at /var/log/ubersmith/ubersmith/docker.log. The logs will use the syslog tag ubersmith/ubersmith.
If /var/log/ubersmith is empty, try restarting the rsyslog daemon. This is typically achieved with the command:
service rsyslog restart
The main system's rsyslog configuration can be updated to forward logs on to a centralized logging system. It is possible to filter the logs forwarded based on syslog tags, but that is outside the scope of this documentation.
It may be necessary to edit the Ubersmith startup script ubersmith_start.sh to include the rsyslog service in the "docker-compose up" command. This will ensure the service is started when this script is executed.