Hillock's Wiki

Converting a database containing tables to utf8

Sat, 18 Feb 2012 06:42:30 +0000

mysqldump -uusername -ppassword -c -e –default-character-set=utf8 –single-transaction –skip-set-charset –add-drop-database -B dbname > dump.sql cp dump.sql dump-fixed.sql vim dump-fixed.sql :%s/DEFAULT CHARACTER SET latin1/DEFAULT CHARACTER SET utf8 COLLATE utf8_general_ci/ :%s/DEFAULT CHARSET=latin1/DEFAULT CHARSET=utf8/ :wq mysql -uusername -ppassword < dump-fixed.sql

Converting an empty database to utf8

Sat, 18 Feb 2012 06:41:12 +0000

use the below command in Mysql 

ALTER DATABASE mydatabasename charset=utf8;

SERVICE CURRENTLY NOT AVAILABLE! Error No. [500]

Sat, 18 Feb 2012 06:40:20 +0000

How to fix the 500 error on roundcube

/usr/local/cpanel/bin/update-roundcube –force

Postix on ubuntu

Sat, 18 Feb 2012 06:39:34 +0000

How to install postfix on Ubuntu

sudo apt-get install postfix

sudo dpkg-reconfigure postfix  sudo postconf -e 'home_mailbox = Maildir/'  sudo /etc/init.d/postfix restart  sudo apt-get install dovecot-common  sudo apt-get install dovecot-imapd

sudo apt-get install dovecot-pop3d

 sudo useradd -d /home/testuser -m testuser

sudo passwd testuser

Increase phpmyadmin upload size in cPanel

Sat, 18 Feb 2012 06:37:58 +0000

How to increase the memory for PHPmyadmin in cPanel server

vi /usr/local/cpanel/3rdparty/etc/php.ini

and change
upload_max_filesize = 150M
post_max_size = 150M

then run in SSH
/usr/local/cpanel/bin/install_php_inis

service cpanel restart

iptables v1.3.5: Couldn’t load match `statistic’

Sat, 18 Feb 2012 06:37:01 +0000

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

How to mitigate DDOS ?

Fri, 26 Aug 2011 17:38:26 +0000

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.

vzquota on failed [3]

Fri, 26 Aug 2011 17:29:53 +0000

“vzquota on failed [3]”

vzquota : (error) Quota on syscall for id 8001: No such file or directory
vzquota on failed [3]

Getting above error in openvz vps ?

This is due to disk quota being on in config file.

Did this post help you ? if yes do visit us for your hosting needs

open below config file associated with VPS whre my VPSID is 8001

vi /etc/sysconfig/vz-scripts/8001.conf

Add below line in config file

DISK_QUOTA=no

Now restart vps and all should work as charm

Limit connection on port 80 using IPTABLES

Tue, 26 Jul 2011 07:57:58 +0000

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.

How to increased /tmp space on live server ?

Sun, 24 Jul 2011 06:53:31 +0000

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