Re: Re: [cobalt-users] load average: 127.30, 126.66, 97.29 killed my Raq 4.

["Oleg Volkov" <voleg@xxxxxxxxxxxx>]

> >1. May be it is DoS. Check the states of connections
> >and takes appropriate measures.
> do you mean ...

DoS is very long issue to cover it on this list. It was/still
covered very well on Internet. Check with netstat status of opened
sockets. If most of them in state SYN_RECV this may indicate that
you suffer from SYNflood. Check also /var/log/httpd/acces or error
log files to find abnormal activities. Digging, digging and digging !


> >2. Usage is OK, but your .pl .cgi is not optimized.
> >Program they again.
> oh.. I will pass on the info to our development team.. they might 
> help me in this.

First of all check with top (P - sort by CPU, M - sort by MemUse)
what killing your computer.

> >3. Your server too weak for this load. Consider upgrade
> >or working in cluster of servers.
> 
> could you direct me to any source with info about cluster of 
> servers.. any url or site..would be very helpfull.

Cluster of HTTP servers is just a number of HTTP servers
with the same content. You just have to add additional IP
address in DNS for this domain name. To illustrate it pls
do nslookup for www.yahoo.com. You'll see a number of IPs.

--
Oleg Volkov
System Administrator
voleg@xxxxxxxxxxxx
SHUNRA Software Ltd.
http://www.shunra.com

+972-9-7643743/93121(Work)
+972-51-601914(Mobile)