kernel: LVE: Can’t enter to lve from slave context

These kind of error can be seen in /var/log/messages in a cpanel cloudlinux based server which will be filling the /var/log/messages quickly.

This can be caused due to below reasons :

1. You are running php as CGI and if that is the case, you can ignore this error and you can get this fixed by simply upgrading to the latest LVE kernel.

2. This happens due to conflict between mod_hostinglimits and mod_fcgid . In such cases, try disabling the mod_hostinglimits and see if that resolves the issue. If it fixes the issue, then

Edit “/usr/local/apache/conf/modhostinglimits.conf” and remove the handlers which are handled by mod_fcgid.

(I simply commented the AllowedHandlers line completely which stopped those errors)

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Cannot allocate memory: couldn’t create child process: /opt/suphp/sbin/suphp

Last day I had an issue with memory and the exact error was the below one.

[Mon Sep 30 10:00:29 2013] [error] [client] (12)Cannot allocate memory: couldn’t create child process: /opt/suphp/sbin/suphp for /home/unier/public_html/index.php
[Mon Sep 30 10:00:29 2013] [error] [client] File does not exist: /home/unier/public_html/500.shtml

On the first look, we should check the Apache conf for any memory limits set  in the Apache configuration file.  You can check this using the below command

# grep RLimitMEM /usr/local/apache/conf/httpd.conf

If you are seeing any result like the below one,  try disabling or removing the line in the httpd.conf file, and restarting Apache.

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Mail bouncing from Microsoft’s Exchange email service in Plesk

Mails from microsoft exchange email services are failed in plesk (qmail). Upon investigation we found that the grey list filter in plesk 10 is blocking server that are on “dsl|pool|broadband|hsd” address ranges. In this case it would be Microsofts cloud anti-spam service that is on “pool” addresses.

Some Microsofts cloud anti-spam servers are;


Log entries are like this Continue reading


R1Soft CDP Error While restoring : Connection refused

Moslty this is caused due to buagent not running. Even if we tried to restart buagent,it will not start and status will be showing “buagent (no pid file) not running”

Check /var/log/messages to see whether kernel module is missing or not. If it is showing any missing kernel modules, you can install kernel modules by simply running  r1soft-cki in the command prompt

# /etc/init.d/buagent restart

# /etc/init.d/buagent status
/etc/init.d/buagent status: buagent (no pid file) not running Continue reading


Cannot start Postfix – Postfix integrity check failed Error

Postfix was not running and an attempt to restart Postfix was failing with the following error in maillog.

mail postfix/postfix-script: fatal: Postfix integrity check failed!
mail postfix/postfix-script: fatal: the Postfix mail system is not running

We have tried a number of solutions and after a bit googling, we found the following command and running that resolved the issue. Continue reading


ntVersionCheck : New release v1.1.0

cPanel plugin for finding the outdated applications in the server. Currently the plugin is configured for wordpress and joomla installations.


  • Find all outdated wordpress and joomla applications in the cPanel Server
  • Display the wordpress and joomla versions with color difference for visibility
  • News, Announce the latest news related with application vulnerabilities and plugin updates
  • The installations are grouped by user and reseller wise
  • One click update available for future releases Continue reading

SecurityException in Application.cpp:175: Calling user is not webserver user / SuPHP / cPanel

We were ended-up in this message after running EasyApache on one of our cPanel servers with mod_suphp. If we set the PHP handler to DSO, PHP applications were working fine; but when we try to switch the handler to SuPHP it started showing the above error message with 500 error code.

The actual cause for this error is given in the messsage in fact, which is “Calling user is not webserver user”. As per the security standards of SuPHP, the user invoking SuPHP must be defined in suphp.conf file and should match the user invoking it. So for a cPanel server, it should be call by the HTTP user which is “nobody”. In our case it was set to “apache” even there is no active “apache” user on a cPanel server. I met this error on a latest cPanel build; so I guess this is a bug with their latest EA3. To correct the issue, I set the value of “webserver_user” to “nobody” in /opt/suphp/etc/suphp.conf and restarted apache service.

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Disable unwanted services – Linux Server

One of the first steps that we should do while presetting a server is to disable unwanted services on the server. The server should be preloaded with some services like bluetooth, X services, etc which are not required to a server normally. The number of such services will vary, based on the default packages installed by your provider. After a little research, we have compiled in a list of services that can be disabled on  Linux servers. Please note that this is a generic one and you should check the list before implementing it, if you are going to build any custom stuff. Normally it should work seamlessly with control panel installations, web services , etc.

The list of services that can be disbaled are listed below seprately for VPS and dedicated servers.

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WordPress – Some quick notes!

What is WordPress?

WordPress is a well known PHP based CMS with MySQL back-end, mostly used to build blogs. In addition to develop blogs, WordPress is commonly used to develop websites as well. Even though the WordPress is build as a blog software, it is very flexible and we can develop beautiful websites with it. There are millions of WordPress powered websites run in Internet now. It built in plug-in architecture and a template system.


1. Customization :- As WordPress is built and operates based on a template system, it provides lots of opening to customize your web pages.

2. Dashboard :- The dashboard of WordPress is quiet nice and very user friendly. Among the other CMSes available in the market, it is very simple but powerful and can be managed even by a newbie easily.

3. Themes :- We can easily switch WordPress themes. There are thousands of themes available in the market; both free and paid versions. As it is a very popular application, your search for good theme will end up in a good result.

4. Plugins :- Plugin support is another big advantage of WordPress. You can find almost all types of your plugin needs with WordPress. Due to its wide range of user-base, plugin development and maintenance is very active in the community.

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