iptables -I INPUT -p tcp –dport 80  -i eth0 -m state –state NEW -m recent  –update –seconds 60 –hitcount  5 -j DROP

This will allow only 5 connection simultanously from per IP.

This can also be to stop ddos attack on webserver.

Looking to increase the /tmp on the linux server?

or getting frequent Mysql error due to /tmp running out of steps ?

below are the steps to increased /tmp partition,

##Stop Mysql in server##

/etc/init.d/mysql stop
###Find and kill the tailwatchd process###

pstree -p | grep tailwatchd
kill -9  < process ID>

#### Copy the /tmp to backup###

cp -prf /tmp /tmp.bak

###Set the /tmp to 2GB now###

dd if=/dev/zero of=/usr/tmpDSK bs=1024k count=2048

###Now find the size of tmp partition###

du -sch /usr/tmpDSK

### unmount /tmp partition

umount /tmp

###Format the /tmp partition###

mkfs -t ext3 /usr/tmpDSK

###Remount in secure environment###

/scripts/securetmp

###Now check size it should be 2GB###

df -h

Few modules or rpm are only available in EPEL repository

To get it via yum and install you need to first enable EPEL in your  system

Below are the steps to enabled it

wget http://download.fedora.redhat.com/pub/epel/5/x86_64/epel-release-5-4.noarch.rpm

2. Run the rpm install command
   rpm -Uvh epel-release-5*.rpm

Configure EPEL Repository

1. Open the EPEL repository file
   /etc/yum.repos.d/epel.repo
2. Set priority for the EPEL repository
   Add priority=3 to the end of the [epel] section

Now you can run and install the required modules using yum

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checking for type of socket size… size_t
“checking for SSL headers… configure: error: Cannot find ssl headers”

Getting above error on installing nrpe plugin on centos ?

Use below libraries to fix it

[root@nagios nrpe-2.12]# yum install openssl-devel

Once this is installed you can go ahead and configure NRPE plugin for nagios

Use below command to fix the issue of “/usr/bin/ld: cannot find -lglut”

yum install  glut-devel

once done you can carry ahead the compilation

if you get error “vzquota : (error) quota file is corrupted”

Use below commands,

[root@server9 lock]# vzquota off 5000

vzquota : (error) quota file is corrupted

[root@server9 lock]# vzquota drop  5000

[root@server9 lock]# vzctl start 5000
Starting container …
Initializing quota …

Now wait for quota to get recreated

if you get error “vzquota : (error) can’t lock quota file, some quota operations are performing for id”

vzquota : (error) can’t lock quota file, some quota operations are performing for id 5000
vzquota on failed [7]

use below commands to check the process which has locked it

[root@server9 lock]# ps ax | grep vzctl
10400 pts/0    T      0:00 vzctl start 5000

#  kill -9 10400

Now restart VPS using vzctl restart 5000  where 5000 is the VEID

Getting error “/usr/bin/rebuild-security-providers is needed” while using yum to install tomcat ?

run the below command to fix it

rpm -Uvh http://plone.lucidsolutions.co.nz/linux/centos/images/jpackage-utils-compat-el5-0.0.1-1.noarch.rpm

Now continue with your installation

“Alert: A vps with the id 110 already exists on the system. This either means this was created outside of hyperVM or else it got orphaned because hyperVM was interrupted forcibly in the midst of a migration”

If you get above error ,it means a vps or orphaned vps already exists

Below are the steps you need to resolve this issue

SSH to server —-> vzctl destroy 110

Now try to create vps from Hypervm panel