ownership of "/var/run/postgresql"

[Dmitry O Litvintsev <litvinse@xxxxxxxx>]

Hi, 

we run 9.6 postgresql DB on Linux box. We run as different user than postgres. To get it to work we had to chown /var/run/postgresql to be owned by the process user. 

Upgraded to 11 and now we see that file 

/var/run/postgresql changes ownership to postgres:postgres on reboot , even though postgresql-11.service is disabled. 

What is doing it and is it possible to disable it?

Thanks, 
Dmitry