I have NEMS 1.5 running on my Raspberry Pi and all of a sudden I am getting critical errors to due to lack of swap space from my other raspberry pi's (running both raspian and DietPi). If I run the command on my NEMS server:
/usr/local/nagios/libexec/check_swap -w 20 -c 10 pihole
I get:
SWAP OK - 1% free (0 MB out of 99 MB) |swap=0MB;0;0;0;99
i.e. swap space is OK but there isn't much free! However if I log in to the raspberry pi server and type
free
I get:
total used free shared buff/cache available
Mem: 949448 135012 562460 36684 251976 727408
Swap: 102396 0 102396
i.e. there is 100% free!
Any idea what is wrong?
Andrew
PS The other odd thing is that when I get critical errors, they occur at exactly the same time for both raspberry pis
Monitoring swap space
RE: Monitoring swap space
Robbie's answer from an earlier post:
[quote="Robbie Ferguson" pid='1185' dateline='1522326145']
I'd suggest just removing Swap from your Linux Servers group.
It's not accurate on a Pi because Pi only has 1 GB RAM and we don't allow it to swap to the SD card. So when RAM gets full, it takes a moment to compress the RAM (thereby creating swap via ZRAM) and hence the Nagios warning.
It's not a warning to worry about at all. The RAM / ZRAM (and thereby swap) are managed by the system... but because of the Pi's lousy RAM specs, you do end up hitting the cap every now and again :)
Robbie
[/quote]
[quote="Robbie Ferguson" pid='1185' dateline='1522326145']
I'd suggest just removing Swap from your Linux Servers group.
It's not accurate on a Pi because Pi only has 1 GB RAM and we don't allow it to swap to the SD card. So when RAM gets full, it takes a moment to compress the RAM (thereby creating swap via ZRAM) and hence the Nagios warning.
It's not a warning to worry about at all. The RAM / ZRAM (and thereby swap) are managed by the system... but because of the Pi's lousy RAM specs, you do end up hitting the cap every now and again :)
Robbie
[/quote]
Best regards,
MarshMan NY, USA
MarshMan NY, USA
RE: Monitoring swap space
Thanks!
This has only started to occur recently so I didn't look too far back in the archives.
Have taken your and Robbie's advice and removed it :-)
Andrew
This has only started to occur recently so I didn't look too far back in the archives.
Have taken your and Robbie's advice and removed it :-)
Andrew
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RE: Monitoring swap space
I too had this problem and have taken Robbie's advice and removed swap from linux servers group.
RT
RT