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linux - Apache MySQL Server Crashing - Large number of connections from localhost

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I'm running a 2GB Centos
5.9 server with the standard LAMP setup. I'm running a wordpress website so it's nothing
to demanding performance wise.



However the MySQL
server seems to keep crashing as I get an Error Connecting To Database when I try to
access my wordpress site.
I checked the CPU and it's running at 100% and the
RAM is also at 100%.



I've tried




service mysqld
restart





and
everything goes back to normal for about 10 minutes and then it crashes
again.



I've also tried adjusting the my.cnf file
and also httpd.conf file but this hasn't fixed
it.



When I run




netstat -ntu |
awk '{print $5}' | cut -d':' -f1 | grep "^[0-9]" | sort
-g | uniq
-c





I
get the following
output:





            1 31.222.135.11
 1 50.56.142.152
 1 50.57.61.11
 1
            78.136.44.13
 2 78.19.241.93

201
            127.0.0.1



Why
are there 201 connections on my loopback address?
Thanks for your help in
advance.



Answer




First of all, you should check if you are
able to connect directly to the MySQL server via the mysql client. Just in case you have
reached the maximum number of connections or there are other server problems (out of
memory, bad disk etc etc)



If you are able to
talk straight to the database, you should check the databases' processlist and see if
anything is taking to much to run etc etc




Check your MySQL's error log.



Lastly, check you apache2 php.ini if the
following are enabled (if the problem is too many connections to the
database):



mysql.allow_persistent
            = On
mysql.max_persistent = -1
mysql.max_links =
            -1

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