Command to find CPU usage of process

ps -eo pcpu,pid,user,args | sort -k 1 -r | head -10

This will show the process which are consuming max CPU

Install NTP

# yum install ntp

# chkconfig ntpd on

# ntpdate pool.ntp.org

and start the NTP

# /etc/init.d/ntpd start


Note :: Do not forget to open port 123 in firewall.


Thanks
Ninad


Command to check SYN attack

netstat -nap | grep SYN | wc -l

Syslogd failed

Check whether syslogd is missing or not:

rpm -q sysklogd

If nothing shows up, do the following to install it:

yum install sysklogd

Restart syslogd service:

/scripts/restartsrv_syslogd

Thanks
Ninad

YUM Error

If you are getting this error on cpanel server

root@ninad~]# yum check-update Loading “installonlyn” plugin Setting up repositories Could not retrieve mirrorlist http://mirrorlist.centos.org/?release=5&arch=i386& repo=extras error was [Errno 4] IOError: Error: Cannot find a valid baseurl for repo: extras

Solution

yum clean metadata
yum clean dbcache
yum makecache

Thanks
Ninad

Command to count VE on node

Give command vzlist|wc -l on node to check the number of VE's.

For example::

[root@ninad02 ~]# vzlist|wc -l
24

This shows there are 24 VE's on that node.

Thanks
Ninad

Install Perl Module from shell

Log into the shell as root and fire the below command

echo "HTML::SimpleLinkExtor" | /usr/local/cpanel/whostmgr/bin/perlmod -i


This will install HTML::SimpleLinkExtor module.