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Error from park wrapper: yourdomain.com is already configured

Today while fixing a domain, I received an error in cPanel. Whenever I try to add an addon domain, I get the saying: Error from park wrapper: mydomain.com is already configured. [Original domain is not shown] I found that in httpd.conf there is no such entry. However, there is a DNS zone for this domain and cpanel records.  After a while I have... [Read more of this article]

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Limiting CPU Usages in Linux using cpulimit

You might have already know how to check the CPU usages of any process. However, worried about any process consuming too much CPU? You should know, you can control the CPU usages of any process by CPU limiter. cpulimit is a free software to limit the CPU of any process. Here is the excepts from there site: cpulimit is a simple program that attempts... [Read more of this article]

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cPanel JailShell, Unmount and Clean Virtfs

If you’re a sysadmin of Cpanel server, you might be aware of the JailShell. Its nothing but a User Shell with limited privileges. Users requesting for shell access to the webhosting server are provided with such shell instead of bash (Which provides root level privileges to users) . Jailshell limits the users access to their home directory and keeps... [Read more of this article]

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fork: resource temporarily unavailable ???

If you are getting Linux error message, Resource temporarily unavailable, it’s because your system is limiting the number of files / processes / CPU that your particular user ID can use. If you use WHM/Cpanel, enabling the “Shell fork bomb protection” can make the “Resource temporarily unavailable” message appear more often. You may get rid... [Read more of this article]

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Opening ports in the firewall for the Mail Server

There are standard ports that are used to access most services. For example, accessing a website generally uses port 80 for normal (HTTP) web pages and port 443 for secure (HTTPS) pages. Smtp Smtp generally uses port 25 for connections although there are recommendations for port 587 (see the official documentation for details). Pop and pops Pop and... [Read more of this article]

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Installing Shoreline firewall (Shorewall) in RHEL

Shorewall is the common name for the Shoreline firewall, a “wrapper” for IPTables that will handle all the heavy lifting for you by simplifying the tasks. This article will get you started, showing you how to get Shorewall on your system. Installation Now then, I have good news and bad news for you. The bad news is that you probably won’t... [Read more of this article]

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How to edit DNS zone (A, CNAME, TXT) in cPanel (not in WHM) as End User (Domain Owner)

Recently cPanel Inc. introduced Simple and Advanced DNS Zone Editor for the domain owner (server’s end user). It was introduced for cPanel version 11.25 (Release 42213). cPanel provided two types of editor. One is simple editor another one is advanced editor. Using simple editor, domain owners can manage A and CNAME records. However, TXT records... [Read more of this article]

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Using Google’s public DNS service as resolvers in your server

Google recently introduced this service. You can use this service as resolver for your server. Login to your server as root Background current resolver settings: cp /etc/resolv.conf /etc/resolv.conf.backup Open the file using vi: vi /etc/resolv.conf Remove the current entries by pressing dd Put the following lines in the file: nameserver 8.8.8.8 nameserver... [Read more of this article]

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Disallow /cpanel, /webmail to be redirected to ssl/tls ports (2083, 2096)

If you are getting certificate errors while you are trying to visit http://domain/cpanel, the most probable reason is that the error is regarding the issuer. That is most people usages self-signed SSL certificates for the services. The error is not a big issue comparing to the benefits of using secured over Non-secured connections.  However, for some... [Read more of this article]

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Install and configure munin (and munin-node) for Server Monitoring

Munin is an efficient and lightweight Monitoring tool. Its available in ’server’ and ‘node’ packages. You can install server in a single machine and node in all other machines and then view all information/statistical data in server machine. This quick copy and paste howto explains steps needed to setup server and multiple nodes. These steps... [Read more of this article]

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DDOS Protection using APF firewall

Following are steps that will configure your APF firewall on your server : > Open /etc/apf/ad/conf.antidos > Change LP_KLOG=”0? to LP_KLOG=”1? > CONAME=”Your Company” ( Enter Companies Name ) > Change USR_ALERT=”0? to USR_ALERT=”1? ( 1 only if you need alerts for emails ) > USR=”you@yourco.com” ( Enter the Email Address... [Read more of this article]

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Adding Spell Checker in SquirrelMail in cPanel server

SquirrelMail provides a spell checker plugin but that may not be enabled by default. However, it is easy to install if you have root access to server. Follow the steps to enable spell checking plugin in SquirrelMail: SSH to server as root and run the following command: cd /usr/local/cpanel/base/3rdparty/squirrelmail/config Now run, [see below if the... [Read more of this article]

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Common iptables command, cheatsheet

#!/bin/sh #File: /etc/rc.d/rc.firewall # Immediately log and drop any known abusive IPs iptables -A INPUT -p tcp -s 87.118.104.44 -m limit –limit 1/minute  –limit-burst 10  -j LOG –log-prefix “[DROPPED_NODE]“   –log-level 4 iptables -A INPUT -p tcp -s 87.118.104.44 -j DROP # Allow from any to any on 127.0.0.1/32 iptables... [Read more of this article]

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Cloud Computing and its benefits

What is Cloud Computing Generally, website hosted on a cloud hosting operates on a clustered servers where online operations are not limited to a single server. By handling security, load balance and hardware resources virtually, the website has access to the processing power of a number of servers that are distributed in real time. According to Wikipedia: Cloud... [Read more of this article]

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Disabling strict zone checking in new Bind

Recent versions of Bind distributed by RedHat and CentOS enable strict zone checking at startup time. This setting can potentially cause problems for Bind users with a large number of zone files or syntax errors in individual zone files. As a result, users may experience an inability to restart Bind after a shutdown. cPanel has, immediately, produced... [Read more of this article]

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