That is very interesting Chris.
As it should not be on 1024/4096 at all.
The limit was not set back in libvirt 2.5 and before, so older versions had a
higher limit - that much is true.
I checked and it has
Artful: Max open files 8192 8192
files
Pre-Artful: Max open files 1048576 1048576
files
But both limits are way above yours.
Your case has ~4 files per guest, but with the right limit that should
be enough to close to 2k guests.
I'd suggest two things:
1. I'll discuss upstream to raise the 8192 to 16384 as it seems Openstack (as a
common setup) has 4 files per guest.
I'll do that and link the Mailing List entry here
2. We need to find why you have a limit applied even lower than what the
service file configures.
@Chris - can you have a look on that system why that could be so low - any
extra limits
applied somewhere?
Does the virlogd service file have the 8192 by default - if it has
1024/4096 what changed it?
If it has 8192, can you see on the system where the 1024/4096 might come
from?
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https://bugs.launchpad.net/bugs/1720887
Title:
Default settings for virtlogd results in "too many open files" errors
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