Linux Convert ext3 to ext4 File system

last updated in Categories CentOS, Data recovery, Linux, Linux desktop, Linux distribution, RedHat/Fedora Linux, Storage, Suse Linux, Sys admin, Tips, Troubleshooting, Tuning, Ubuntu Linux

Some time ago ext4 was released and available for Linux kernel. ext4 provides some additional benefits and perforce over ext3 file system. You can easily convert ext3 to ext4 file system. The next release of Fedora, 11, will default to the ext4 file system unless serious regressions are seen. In this quick tutorial you will learn about converting ext3 to ext4 file system.

BIND Named: Set a Zone Transfer IP Address For Master DNS Server

last updated in Categories BIND Dns, CentOS, data center, fedora linux, FreeBSD, High performance computing, Linux Scalability, RedHat/Fedora Linux, Troubleshooting

I’ve three nameserver load-balanced (LB) in three geo locations. Each LB has a front end public IP address and two backend IP address (one for BIND and another for zone transfer) are assigned to actual bind 9 server running Linux. So when a zone transfer initiates from slave server, all I get errors. A connection cannot be established, it tries again with the servers main ip or LB2 / LB3 ip. This is a problem because my servers are geo located and load balanced. However, there is a small workaround for this problem.

FreeBSD Turn On Process Accounting – Track System Resources Used By Users

last updated in Categories FreeBSD, Howto, Monitoring, Security, Sys admin, Tips, Troubleshooting, Tuning

I’ve already written about Linux process accounting under Linux ( see how to keep a detailed audit trail of what’s being done on your Linux systems). You can easily setup process accounting under FreeBSD. This tutorial expalins how to enable and utilizing FreeBSD process accounting including many other useful options are explained to keep track of system resources used, and their allocation among users.

Apache2 mod_fastcgi: Connect to External PHP via UNIX Socket or TCP/IP Port

last updated in Categories Apache, CentOS, fedora linux, Howto, lighttpd, Networking, php, RedHat/Fedora Linux, Security, Tips, Troubleshooting, Tuning

Now, mod_fastcgi is configured and running. FastCGI supports connection via UNIX sockets or TCP/IP networking. This is useful to spread load among various backends. For example, php will be severed from 192.168.1.10 and python / ruby on rails will be severed from 192.168.1.11. This is only possible with mod_fastcgi.

HowTo: Authenticate Linux Clients with Microsoft Active Directory

last updated in Categories Linux, Linux desktop, RedHat/Fedora Linux, Sys admin, Tips, Troubleshooting, Windows, Windows server

Every IT shop has a mix of Windows and Linux system. Sometime you need to authenticate your Linux desktop system against Microsoft Active Directory service. You can save time, effort and IT infrastructure by sharing authentication server. This article explains how to setup the Linux desktop computers with Active Directory using Samba and winbind.

Nagios: System and Network Monitoring Book

last updated in Categories Book Review, Linux, Monitoring, RedHat/Fedora Linux, Suse Linux, Sys admin, Troubleshooting, Ubuntu Linux, UNIX, Windows server

The convenience and reliability that monitoring programs offer system administrators is astounding. Whether at home, commuting, or on vacation, admins can continuously monitor their networks, learning of issues long before they become catastrophes.

Nagios, the most popular open source solution for system and network monitoring, is extremely robust, but it’s also intensely complex.

Troubleshooting Lighttpd Chrooted RedHat PHP Version 5.1.6-20.el5_2.1

last updated in Categories CentOS, GNU/Open source, kernel, lighttpd, Linux, Linux distribution, php, RedHat/Fedora Linux, Troubleshooting

It appears that latest php version 5.1.6-20.el5_2.1 under RHEL / CentOS Linux v5.2 has made some major changes. As a result choort jail setup using previous instructions no longer works. PHP is crashing with segmentation fault errors. So I had to trace php errors using strace command.