centos email server suddenly much slower. What to do?
I run my own email server for some domains I administer, on a centos
vps server with a very small number of users.
The only services are smtp, imap/pop, webmail
Everything was running without problems until this morning. I left
home for 1/2 hours, and when I came back everything had become about
100x slower (seriously!). The services were/are still all up and
running, but practically unusable (even running mutt in my ssh session
is almost frozen).
I have not changed/updated anything in the last 1/2 weeks. I have
already done a few checks with the VPS provider, and it looks like:
network & hardware are OK
there seem to be no strange processes running. I didn't manage to save
the output of "top", but it didn't show anything that (AFAICT, of
course) should not be there on an email server
however, there is something that is using "much more memory than
normal" (see the comment below from the hosting sysadmin after he
checked user_beancounters). Initially we thought it was apache, but
even switching it off didn't change anything. What now?
Any help to understand what the heck happened, and find out what
exactly _started_ to cause this problem is very welcome!
As you can see, there are some fails for the privvmpages. This means
your VPS tried to use more RAM than what is available (e.g. more than
1GB RAM). If you are only running some basic mail services on your
VPS, that's definitely not normal and you should investigate that
accordingly. We have fully checked everything for hardware and network
problems and everything is working flawlessly. In combination with the
RAM shortage errors, it is safe to conclude that there's something
within your VPS itself that's malfunctioning.
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