Issue Apache going down every hour

[H.W.B]

Hello.

Since yesterday i have a strange problem.
Apache is going down every hour, and the restarted by Watchdog.
In the log files i see this :

[Sun May 30 19:58:25.477729 2021] [mpm_prefork:notice] [pid 5491] AH00171: Graceful restart requested, doing restart
[Sun May 30 19:58:30.231024 2021] [lbmethod_heartbeat:notice] [pid 5491] AH02282: No slotmem from mod_heartmonitor

no more errors or else shown.
I receive messages from the Whatchdog that APACHE is DOWN and later is RESTARTED.

I did not change any configuration, Only the Plesk and System updates are installed.

Ans the strangest thing is, that all websites keeps working when he is restarting APACHE!!!!

Version	Plesk Obsidian v18.0.35_build1800210526.11 os_CentOS 7
OS	CentOS Linux 7.9.2009 (Core)

Does somebody know how to make Apache stays working.....

Henk

 

[weltonw]

It looks like it is doing a graceful restart. If the website works while apache "down" you should be fine, though you'll want to figure out what is trying to restart apache every hour.

A graceful restart has, in theory, zero downtime as requests are gracefully finished, and new requests are queued.