ulogd2.service doesn't seem to work on Ubuntu 19.10.
When I do ls /run/ulog/ulogd.pid it finds nothing.
I think the file can't be generated.
When I do ls -lt /run it shows the correct access rights:
drwxr-xr-x 2 ulog ulog 40 Feb 16 17:32 ulog
Feb 16 17:32:28 stag-1 ulogd[7074]: registering plugin `JSON'
Feb 16 17:32:28 stag-1 ulogd[7074]: building new pluginstance stack: 'ct1:NFCT,ip2str1:IP2STR,print1:PRINTFLOW,emunfct1:LOGEMU'
Feb 16 17:32:28 stag-1 ulogd[7074]: can't find requested plugin NFCT
Feb 16 17:32:28 stag-1 ulogd[7074]: building new pluginstance stack: 'ct2:NFCT,ip2str1:IP2STR,jsonnfct1:JSON'
Feb 16 17:32:28 stag-1 ulogd[7074]: can't find requested plugin NFCT
Feb 16 17:32:28 stag-1 ulogd[7074]: not even a single working plugin stack
Feb 16 17:32:28 stag-1 systemd[1]: ulogd2.service: Can't open PID file /run/ulog/ulogd.pid (yet?) after start: No such file or directory
Feb 16 17:32:28 stag-1 systemd[1]: ulogd2.service: Failed with result 'protocol'.
-- Subject: Unit failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- The unit ulogd2.service has entered the 'failed' state with result 'protocol'.
Feb 16 17:32:28 stag-1 systemd[1]: Failed to start Netfilter Userspace Logging Daemon.
-- Subject: A start job for unit ulogd2.service has failed
-- Defined-By: systemd
-- Support: http://www.ubuntu.com/support
--
-- A start job for unit ulogd2.service has finished with a failure.
--
-- The job identifier is 26836 and the job result is failed.
I found the reason. The error message wasn't clear to me. ulogd2 has most plugins commented out by default in Ubuntu 19.10. (Unlike 18.04).
I had to remove # (comment-in) the following four to make it work correctly. It will then automatically create that pid file. It is not about permissions as I first thought.