Overload Of Traffic

Jul 2, 2009

I am not sure if my dedicated server is being attacked or if it is legitimate traffic. I need help figuring out the difference and if it is an attack, how to prevent it, and if it is legitimate traffic, how to configure the server to handle the load.

My server information is below:

HardwareIntel Xeon 3220-Quad Core [2.4GHz
8GB DDR2
SATAII 500GB

SoftwareCentOS 5.3-32
Apache2
MySQL 5
PHP 5
When I do ps aux|grep httpd|wc -l I get the count of current connected clients of 259 which is always maxing out my MaxClients of 256. I had increased it to 512, and it maxed out, I had increased it to 1024 and it maxed out, and lastly I had setup to 2048 and it works, but slows the entire server down.

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cpsrvd up [green]
Server Load 5.41 (1 cpu) [red]
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Disk /dev/sda1 (/boot) 13 % [green]
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Code:
# cat /proc/cpuinfo
processor : 0
vendor_id : GenuineIntel
cpu family : 15
model : 6
model name : Intel(R) Xeon(TM) CPU 3.00GHz
stepping : 4
cpu MHz : 7680.000
cache size : 2048 KB
physical id : 0
siblings : 4
core id : 0
cpu cores : 2
apicid : 0
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
flags : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm syscall nx lm constant_tsc pni monitor ds_cpl vmx est cid cx16 xtpr lahf_lm
bogomips : 6012.44
clflush size : 64
cache_alignment : 128
address sizes : 36 bits physical, 48 bits virtual
power management:

processor : 1
vendor_id : GenuineIntel
cpu family : 15
model : 6
model name : Intel(R) Xeon(TM) CPU 3.00GHz
stepping : 4
cpu MHz : 5120.000
cache size : 2048 KB
physical id : 1
siblings : 4
core id : 0
cpu cores : 2
apicid : 4
fpu : yes
fpu_exception : yes
cpuid level : 6
wp : yes
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cache_alignment : 128
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Few days ago some Forum spammers signed up to one of the forums. One of them: stopforumspam.com/ipcheck/212.178.2.3

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------------------Next step-------------------
log to SSH
# uptime
# 12:XX:XX up XXX days, 5:06, X users, load average: 10.58, 8.86, 5.86

my normal load is less than 0.9

-----------------check open ports ---------------------------
netstat -nap
Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:995 0.0.0.0:* LISTEN 1936/couriertcpd
tcp 0 0 0.0.0.0:3306 0.0.0.0:* LISTEN 32447/mysqld
tcp 0 0 0.0.0.0:106 0.0.0.0:* LISTEN 14307/xinetd
tcp 0 0 0.0.0.0:139 0.0.0.0:* LISTEN 9943/smbd
tcp 0 0 0.0.0.0:110 0.0.0.0:* LISTEN 1916/couriertcpd
tcp 0 0 0.0.0.0:143 0.0.0.0:* LISTEN 1840/couriertcpd
tcp 0 0 0.0.0.0:8880 0.0.0.0:* LISTEN 9626/httpsd
tcp 0 0 0.0.0.0:80 0.0.0.0:* LISTEN 7645/httpd
tcp 0 0 0.0.0.0:465 0.0.0.0:* LISTEN 14307/xinetd
tcp 0 0 0.0.0.0:21 0.0.0.0:* LISTEN 14307/xinetd
tcp 0 0 [MyServerIP]:53 0.0.0.0:* LISTEN 13619/named
tcp 0 0 [MyServerIP]:53 0.0.0.0:* LISTEN 13619/named
tcp 0 0 [MyServerIP]:53 0.0.0.0:* LISTEN 13619/named
tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN 13619/named
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 13820/sshd
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN 14307/xinetd
tcp 0 0 127.0.0.1:953 0.0.0.0:* LISTEN

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IMPORTANT: Do not ignore this email.
This is cPanel cpuwatch on xxx.com!
While processing, the cpu has been
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I searched on load average and found that average load for 1 cpu is 2 and default value is 5 to 10.but here i am getting mail for 1.11 itself.I changed the value of threshold of load average in stat and logs of tweak setting to 4.but no improvement.now also i am getting more than 4 mails for average load i.e 1.23 also

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2)i am getting nothing more than rsync and exim at the time of overload(while using TOP command).So why now only i am getting warning mail?
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Is there a way to protect apache server from overload? For example Nginx has a module called SysGuard when system load or memory use goes too high all subsequent requests will be redirected to the URL specified by the 'action' parameter.

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[url]
[url]
[url]
[url]

CENTOS 5.3 i686 standard on server
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Time: Thu Jul 3 12:22:06 2008
1 Min Load Avg: 42.90
5 Min Load Avg: 13.89
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I have been receiving these a couple time a day lately and not sure what to do or how to go about checking what might be overloading the server. IF this looks familiar to anyone, I'd appreciate some helpful tips. I'm still a novice, but can muddle my way around the server if given enough guidance. Here is the email I've been getting:

"IMPORTANT: Do not ignore this email.
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Jun 9, 2008

I'm on a low-end dedicated server that I run 2 decent sized blogs on. I'm getting several traffic spikes a day where the load goes through the roof and I think I need my server optimized.

My server admin says I need a bigger server and he has never steered me wrong but this is ridiculous:

My blogs use Wordpress as its blogging platform....I know they hog server resources and I've recently installed Super cache so that seems to help.

I average about 5,000 pageviews a day and I would think even a low-end box should handle this but maybe I am wrong.

Here's the server specs:

Processor #1 Vendor: GenuineIntel
Processor #1 Name: Intel(R) Celeron(R) CPU 2.40GHz
Processor #1 speed: 2394.661 MHz
Processor #1 cache size: 128 KB

Memory: 1033924k/1048016k available (2171k kernel code, 13360k reserved, 723k data, 172k init, 130512k highmem)

hda: ST380011A, ATA DISK drive
hdc: Lite-On LTN486S 48x Max, ATAPI CD/DVD-ROM drive
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hda: cache flushes supported
hdc: ATAPI 48X CD-ROM drive, 120kB Cache, UDMA(33)

Memory:

total used free shared buffers cached
Mem: 1035148 993356 41792 0 151312 527008
-/+ buffers/cache: 315036 720112
Swap: 2040212 476700 1563512
Total: 3075360 1470056 1605304

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I have 3 questions.

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2.) My server seems REALLY sluggish. I ran a top in shell, and mysqld was taking up from 70% to 110% of the cpu. Is there any way to fix this or find out why? I've restarted the server, and it's fluctuating between 50% and 90% now.

3.) I think this MIGHT be related to the sqld issue, but I've received about 12 emails saying
Quote:

"[statscheck] Stats/Server Overload on my server". "MPORTANT: Do not ignore this email.

This is cPanel stats runner on server1.cewxp.com!

While processing the log files for user cewxp, the cpu has been
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and also another email

Quote:

IMPORTANT: Do not ignore this email.

This is cPanel stats runner on server1.cewxp.com!

While processing the log files for user vegapunk, the cpu has been maxed out for more than a 6 hour period. The current load/uptime line on the server at the time of this email is 12:34:26 up 5 days, 7:37, 2 users, load average: 19.90, 17.59, 17.97

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Example:

IP 192.168.254.1 = 100GB monthly.

IP 192.168.254.2 = 50GB monthly.

Etc. ..

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