[CentOS] systemd / services / current process list

Fri Nov 6 13:57:38 UTC 2020
Leon Fauster <leonfauster at googlemail.com>


following requirement is needed here (forced by application
migration from C6->C8):

I have two services running under supervision by systemd.

ServiceA: runs as user AppUser
ServiceB: runs as user AppUser

ServiceB can see "all" processes from AppUser (ps aux)
running by systemd (in fact it sees no other processes).
So ServiceB can see the processes of ServiceA.

I have also a cron job that runs every 5 minutes as user AppUser.

Now the problem is, that ServiceB via ps aux can't see the process of 
the cron job albeit running by the same AppUser.

Which security feature of systemd can be altered to allow seeing all
or at least AppUser's processes?

ServiceA as only this "features":

ServiceB as only this features:

Any hints would be great!