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On Plesk for Linux mod_status is disabled on upgrades to improve Apache security. This is a one-time operation that occurs during an upgrade. You can manually enable mod_status later if needed.
You can start with this: http://alvinalexander.com/blog/post/linux-unix/linux-lsof-command
Then check http://www.cyberciti.biz/faq/linux-increase-the-maximum-number-of-open-files/
You need to restart apache, just deleting the file will not help. Usually I do not delete the file, cause can still there, I overwrite it like
cp /dev/null /var/www/vhosts/domainname/logs/error_log
This is happening all the time.
1. You can ignore it, 140MB is not a lot, logrotate should solve it.
2. You can see where you get a lot of entries and solve it via Fail2Ban or firewall, if you think is an attack.
3. If is a DNS entry like in this case I see, you can eventually try to log only...
Try to repair/reinstall Postfix. Or if is hard, start autoinstaller switch to qmail and then switch back with a second install. Usually this work. Not a nice way, but work.
You should not have in php-fpm or fastCGI environment anymore 777 or 775 files/folders. Because apache is executed as a user, you can have safely 644 for files and 755 for folders.
I use automysqlbackup to create a daily/weekly/monthly backup. It is not the perfect solution, but in years saved my *** a few times (or a lot of times).
wget -O /etc/cron.daily/automysqlbackup.sh http://www.grafxsoftware.com/download/backup-plesk/automysqlbackup.sh
chmod 700...
An another solution, in case if your ISP cannot provide IPv6 reverse DNS is to switch postfix to IPv4 only.
Change the following line in the postfix main.cf file and restart postfix:
inet_protocols=all
into
inet_protocols=ipv4
yum list mysql* should show if was installed or not mysqlclient, I think yes.
if exist, I think it was from ART repo and match this version. If yes, then you should install it again (update).
it is easier to me to do it, hard to presume what you have there :-)