Linux Servers cPanel webhosting blog

phpMyAdmin showing the foreach() error

Gunjan — Sat, 04 Feb 2012 17:18:43 +0000

After upgrading the cPanel version, the following error is occur when we are browsing the phpMyAdmin.

Warning: Invalid argument supplied for foreach() in /usr/local/cpanel/base/3rdparty/phpMyAdmin/tbl_replace.php on line 52

Warning: Invalid argument supplied for foreach() in /usr/local/cpanel/base/3rdparty/phpMyAdmin/tbl_replace.php on line 155

Warning: Cannot modify header information – headers already sent by (output started at /usr/local/cpanel/base/3rdparty/phpMyAdmin/tbl_replace.php:52) in /usr/local/cpanel/base/3rdparty/phpMyAdmin/libraries/common.lib.php on line 1154

To resolve the above error, we can simply enable the output_buffering in the following file.

/usr/local/cpanel/3rdparty/lib/php.ini

Change the “output_buffering” from Off to On.

Admin user blocked in Plesk control panel.

Gunjan — Sat, 28 Jan 2012 07:22:14 +0000

After trying to login in to the Plesk panel with the incorrect password as per security policy admin account locked for the 30 minutes at that we have to wait for 30 minutes to get admin account unlocked or we can unlocked the admin user from shell.

linux@server[~]#mysql -u admin -p adminpassword

Use the password received in the first command.
mysql> use psa;
delete from lockout where login = ‘admin’;

Now try to browse the Plesk panel with the admin user and correct password.

Server wide permission issue after enabling suphp

Gunjan — Sun, 22 Jan 2012 09:24:01 +0000

After enabling the suphp on the server,many time 500 Internal Server Error occur due to the incorrect permission,ownership and incorrect php module defined in the .htaccess file and we can’t make the changes manually therefore we can use the following script to make the all the changes server.

linux7802@server[~]#cat /root/suphppermission.sh

#!/bin/bash

# Reset the directory permissions.
chmod 755 /opt/suphp
find /opt/suphp -type d -exec chmod 755 {} \;

# Reset permission,ownership for cPanel user
for user in `/bin/ls /var/cpanel/users`; do

chown -R ${user}:${user} /home/${user}/public_html
chmod 755 /home/${user}/public_html
find /home/${user}/public_html -type f -exec chmod 644 {} \;
find /home/${user}/public_html -type d -exec chmod 755 {} \;

# Remove php_values in the .htaccess file.
find /home/${user}/public_html -name ‘.htaccess’ -exec sed -ie ‘s/php_value/#php_value/’ {} \;
find /home/${user}/public_html -name ‘.htaccess’ -exec sed -ie ‘s/php_flag/#php_flag/’ {} \;
done

If you have any issue to copy the above content the download the script from following URL
scr

Rebuild qmail service on Plesk server

Gunjan — Sat, 14 Jan 2012 23:59:49 +0000

As qmail service is corrupt on the server then we can reconfigure it by using the following steps but make sure that you have logged in as root user.

Stop the running mail services.

/etc/init.d/qmail stop
/etc/init.d/xinetd stop

Now take the backup for the existing qmail to ignore any data loss issue.

mv /var/qmail/queue /var/qmail/queue_old

Now check which qmail rpm we are using on the server

rpm -q psa-qmail

As soon as you confirm the installed qmail rpm, select the rpm from the following URL as per the Plesk version and server OS.

http://autoinstall.pp.parallels.com/

For example we are using the Plesk 9.0.1 and cetnOS 5.6 with 32BIT

rpm -Uvh –force http://autoinstall.pp.parallels.com/PSA_9.0.1/dist-rpm-CentOS-5-i386/opt/maildrivers/psa-qmail-1.03-cos5.build90090127.18.i586.rpm

Now restart the mails services

/etc/init.d/qmail start
/etc/init.d/xinetd start

cPanel log to check when hosting created and deleted

Gunjan — Wed, 11 Jan 2012 13:28:55 +0000

In the recent days, we all are facing the hacking issue at that time, we always see problem like account termination from the serve at that time, we can use the following log file to investigate the issue as its providing when hosting account was created, owner changed or account deleted from the server.

For example we are checking logs for the domain test123.com and as per the following logs the hosting account for domain test123.com is created by using the root owner on dated Wed Jan 11 08:19:40 2012 and onwership is under root

root@linux7802 [~]# cat /var/cpanel/accounting.log | grep test123.com
Wed Jan 11 08:19:40 2012:CREATE:root:root:test123.com:115.124.103.126:admin111

Now we have changed the ownership for the domain test123.com hosting account to linux780 reseller ownership therefore check the following logs

root@linux7802 [~]# cat /var/cpanel/accounting.log | grep test123.com
Wed Jan 11 08:22:51 2012:CHANGEOWNER:root:root:test123.com:admin111:root:linux780

Now we have terminated the hosting account for the domain test123.com by using the root user and its also recorded in the accounting.log

root@linux7802 [~]# cat /var/cpanel/accounting.log | grep test123.com
Wed Jan 11 08:25:14 2012:REMOVE:root:root:test123.com:admin111

So we can similarly check the logs for all the domains when they have created/modified or removed from the server and its always to better to maintain the accounting.log for future reference.

vzmigrate command for VPS migration

Gunjan — Tue, 10 Jan 2012 14:40:56 +0000

The vzmigrate command is used to migrate the one VPS from node to the new or another node.

For example, we want to migrate the VPS which is currently having id 110 on new node and its ip is 192.168.0.1

server@linux[~]# vzmigrate 192.168.0.1 110

server@linux[~]# vzmigrate -r no 192.168.0.1 110

Some time node on which,we are trying to migrate the VPS we are receiving the following error message

110 already exists on the destination node.

To resolve the above error we can assign new id to the VPS

server@linux[~]#vzmigrate -r no 192.168.0.1 110:120

The new id on the new node will be 120 for VPS

We can also do online migration of VPS from one to another node.

server@linux[~]#vzmigrate --online 192.168.0.1 110

or

server@linux[~]#vzmigrate --online 192.168.1.130 110:120

If you want to migrate all the running VPS from one node to another node then refer to following command

for CT in $(vzlist -H -o veid);

do vzmigrate --remove-area no --keep-dst $1 $CT; done

cPanel file manager giving 404 not found error

Gunjan — Sun, 08 Jan 2012 16:28:00 +0000

While browsing the file manager from the cPanel the 404 not found error message is occur.

Not Found

The server was not able to find the document (./frontend/x3/index.html) you requested.
Please check the url and try again. You might also want to report this
error to your web hosting provider.

whostmgrd/11.25

As per above error message x3 theme is causing the problem therefore simply move the x3 theme and resinstall it by running the upcp, you can rename the theme under which you are facing the problem.

linux@server[~]#cd /usr/local/cpanel/base/frontend

linux@server[~]#mv -v x3 x3-corrupt

linux@server[~]#/scripts/upcp –force

Now browse the file manager, it will work properly.

How to block referrer from single domain and multiple domains

Gunjan — Sun, 08 Jan 2012 00:59:46 +0000

Use the following rewrite rule to block the referrer from single domain/web site.

RewriteEngine on
# Options +FollowSymlinks
RewriteCond %{HTTP_REFERER} test\.com [NC]
RewriteRule .* – [F]

Similarly you can block the referrer from the multiple sites by using the following rewrite rule in the .htaccess file.

RewriteEngine on
# Options +FollowSymlinks
RewriteCond %{HTTP_REFERER} test\.com [NC,OR]
RewriteCond %{HTTP_REFERER} test123\.com
RewriteRule .* – [F]

Recreate the jos_session for Joomla script

Gunjan — Tue, 03 Jan 2012 20:32:43 +0000

Some time we face the jos_session session corrupt error message at that time, we can recreate the “jos_session” table by running the following query from the phpmyadmin.

DROP table if exist `jos_session`

CREATE TABLE `jos_session` (
`username` varchar(150) default ”,
`time` varchar(14) default ”,
`session_id` varchar(200) NOT NULL default ’0′,
`guest` tinyint(4) default ’1′,
`userid` int(11) default ’0′,
`usertype` varchar(50) default ”,
`gid` tinyint(3) unsigned NOT NULL default ’0′,
`client_id` tinyint(3) unsigned NOT NULL default ’0′,
`data` longtext,
PRIMARY KEY (`session_id`(64)),
KEY `whosonline` (`guest`,`usertype`),
KEY `userid` (`userid`),
KEY `time` (`time`)
) TYPE=MyISAM CHARACTER SET `utf8`;

But make sure that you have taken the backup for the existing database.

NOTE : If you have any issue to copy the above query, please refer to the following URL to copy the jos_session table query.

http://www.theperfectarts.com/jos_session.txt

Mysql tuner to tune mysql service

Gunjan — Wed, 28 Dec 2011 05:42:46 +0000

Install the mysql tuner to tune the mysql service to avoid any memory usage due to incorrect settings in the /etc/my.cnf file.

root@linux7802 [~]# cd /usr/local/src/

root@linux7802 [/usr/local/src]# wget -O mysqltuner.pl mysqltuner.pl

root@linux7802 [/usr/local/src]# perl mysqltuner.pl

Above command will give you the statistics as well as recommendations to improve the server perfomance

Refer to the following image to example of statistics

For recommendations example refer to the following image and made the necessary changes in the /etc/my.cnf file and retest the script to check, if issue resolved or not……

Its an example for recommendations

Note : Most of the time it recommend to optimize the mysql at that time use the following command but make sure that you have talen backup for the /var/lib/mysql directory to avoid any problem.

mysqlcheck –optimize -A