Linux Servers cPanel webhosting blog » Common errors

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

Enable mod gzip and mod deflate module

Gunjan — Sat, 24 Dec 2011 05:51:34 +0000

The server load is normal but web pages are loading very slow due to heavy web size therefore at that time, we can enable the web page compression for the hosting account. To enable the compress make sure that mod_deflate module.

To install the mod_deflate module refer the following setps.

root@linux7802 [~]# /scripts/easyapache

Select the “Deflate” option available under the “Apache Built-in Modules” as soon as Apache recompiled login in to domain hosting account under which you are facing the problem.

For example the linux7802.com domain having the slow web page loading issue therefore we can create the new .htaccess file or edit the existing .htaccess file and add the following code.

#compress all text & html:
AddOutputFilterByType DEFLATE text/html text/plain text/xml
# Or, compress certain file types by extension:

SetOutputFilter DEFLATE

Check the following file

root@linux7802 [/home/linux780/public_html]# cat .htaccess
#compress all text & html:
AddOutputFilterByType DEFLATE text/html text/plain text/xml
# Or, compress certain file types by extension:

SetOutputFilter DEFLATE

We can also use the following code in the .htaccess file

#compress all text & html:
AddOutputFilterByType DEFLATE text/html text/plain text/xml
# Or, compress certain file types by extension:

SetOutputFilter DEFLATE

After adding the above check the web page compression by using the following URL

http://www.gidnetwork.com/tools/gzip-test.php

Update the webalizer logs manually

Gunjan — Tue, 13 Dec 2011 10:22:19 +0000

To update the webalizer for the single domain refer the following steps, for your kind information if domlogs are rotated on the server then it could be possible that you will miss the existing stats therefore run the command after taking all the essential files backups.

root@server [~]#/usr/local/cpanel/3rdparty/bin/webalizer /usr/local/apache/domlogs/DomainName -n DomainName

For example we are runnning the webalizer for the theperfectarts.com domain

root@server [~]#/usr/local/cpanel/3rdparty/bin/webalizer /usr/local/apache/domlogs/theperfectarts.com -n theperfectarts.com

Once above command run successfuly run the following command

root@server [~]#/usr/local/cpanel/startup

Redirect loop and LimitInternalRecursion error message.

Gunjan — Thu, 02 Sep 2010 11:06:37 +0000

Most of the time we receive following redirect loop error message.

Request exceeded the limit of 10 internal redirects due to probable configuration error. Use ‘LimitInternalRecursion’ to increase the limit if necessary. Use ‘LogLevel debug’ to get a backtrace
To avoid above error message simply use following code in .htaccess file.

RewriteCond %{ENV:REDIRECT_STATUS} 100

RewriteRule .* - [L]

Horde Failed to connect to localhost:25 error message

Gunjan — Fri, 06 Aug 2010 06:02:26 +0000

On Shared server as well as on Dedicated server some time we are facing large connection issue to SMTP port 25 at that time mostly we disable SMTP port 25 and enable any other port for SMTP but after changing SMTP port mostly we receive following error message in Horde webmail.

There was an error sending your message: Failed to connect to localhost:25 [SMTP: Invalid response code received from server (code: 421, response: Too many concurrent SMTP connections; please try again later.)]

To resolve above error simply change SMTP port from 25 to new SMTP port in following file.

root@server [/usr/local/cpanel/base/horde/imp/config]# Pico servers.php

And change following line

From

‘smtpport’ => 25,

‘smtpport’ => 26,

We have taken new port as 26 for example you can use any port as per your requirement.

Similar problem with “Squirrelmail” then refer following steps.

root@server [/usr/local/cpanel/base/3rdparty/squirrelmail/config]#pico config_default.php

Change following line

From

$smtpPort = 25;

$smtpPort = 26;

Save file and exit and now open the webmail.

New subdomain missing cgi-bin directory.

Gunjan — Sun, 11 Jul 2010 02:32:23 +0000

While creating new subdomain from cPanel we are missing cgi-bin directory. At that time refer following steps.

Login in to WHM and check the domains hosting account package allow “CGI Privilege” or not. If not then enable “CGI Privilege” by editing packages.

WHM >> Account Functions >> Modify An Account and select the user from list and check box following option.

CGI Privilege

And save the package. Now you will able to creaet subdomain with the cgi-bin directory.

Note : As well as plesae set “Y” in WHM >> Main >> Server Configuration >> Basic cPanel/WHM Setup >>CGI Script Alias section.

——————

CGI Script Alias * Automatically create a cgi-bin script alias. This setting can be individually overridden during account creation.

y – Yes
n – No

——————

SuExec server permission issue?

Gunjan — Sat, 03 Jul 2010 21:56:09 +0000

After enabling SuExec on server most users getting “500 Internal Server Error” at that time refer following steps.

1st) Correct cPanel users files/directories ownership.

——

for i in `cat /etc/trueuserdomains | awk ‘{print $2}’`
do
chown $i.$i /home/$i -R;
chown $i.mail /home/$i/etc -R;
chown $i.nobody /home/$i/public_html;
done;

—–

2nd) Correct permission for files and directories for cPanel users from shell but make sure that you logged in as root user and running following command in /home partition.

—–

find . -type d -perm 777 -exec chmod 755 {} \;

find . -type f -perm 644 -exec chmod 755 {} \;

—–

JoomlaFCK editor is not working?

Gunjan — Mon, 17 May 2010 20:34:00 +0000

Some time JoomlaFCK editor is not allowing to add any text after installing Joomla. Refer following steps to sort out the JoomlaFCK problems.

Open configuration.php file and replace following line

From

var $live_site = ‘http://domain.com’;

var $live_site = ‘http://www.domain.com’;

Ownership wrong for cPanel users.

Gunjan — Mon, 19 Apr 2010 04:53:53 +0000

Sometime when we migrate the servers by using rsync we face ownership problems for cPanel users files/directories. At that time we can use following command from shell to resolve issue within few minutes.

——

for i in `cat /etc/trueuserdomains | awk ‘{print $2}’`
do
chown $i.$i /home/$i -R;
chown $i.mail /home/$i/etc -R;
chown $i.nobody /home/$i/public_html;
done;

—–

Make sure that you are using root login details to run above command.

Maximum file limit reach while starting Apache?

Gunjan — Fri, 18 Dec 2009 11:35:34 +0000

Maximum file limit reach error is occur while we are starting the Apache server at that time you can fix the issue by using root login details.

root@gunjan[~]#pico /etc/sysctl.conf
Add following line as

fs.file-max = 22992

Save and exit from the file.

You need to run following command from shell to active changes.

root@gunjan[~]#sysctl -p
It will increase the maximum number of open files for your Server.