Getting error in iptables ?
use below steps to get it resolved
yum -y update
iptables -m statistic -h
modprobe -l |grep statistic
rpm -q iptables
wget http://pkgs.org/centos-5-rhel-5/centalt-x86_64/ipt_statistic-0.1-1.el5.x86_64.rpm.html
wget http://pkgs.org/centos-5-rhel-5/centalt-x86_64/ipt_statistic-0.1-1.el5.x86_64.rpm
wget http://centos.alt.ru/repository/centos/5/x86_64/centalt-release-5-3.noarch.rpm
rpm -Uvh centalt-release*rpm
Getting DDOS from rival companies ?
Even we had but we do have a tachnique to mitigate its impact
Use the below IPTABLES rule on your server and it should get mitigated
A INPUT -p tcp –dport 80 -i eth0 -m state –state NEW -m recent –set
/sbin/iptables -A INPUT -p tcp –dport 80 -i eth0 -m state –state NEW -m recent –update –seconds 8 –hitcount 13 -j DROP
You can contact us for any assistance for any issues related to Linux.
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
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
If you’re getting the error ” 550 Access denied Invalid HELO” when sending out email in out look . Please double check your email setting to use the following
For outlook
This will fix the issue and can send mails now