I’ve already wrote about setting up a Linux transparent squid proxy system. However I’m getting lots of questions about Squid basic installation and configuration: How do I install Squid Proxy server on CentOS 5 Liinux server? Sure Squid server is a popular open source GPLd proxy and web cache. It has a variety of uses, […]


From my mailbag: We have 5 Dell server collocated running CentOS 4.x and 5.x server operating system. Sometime my file system (ext3) goes read-only. I’d like to know what could be causing such a problem? My guess: a) Hardware problem / hard disk problem, check harddisk for errors. b) High disk I/O aka busy I/O […]


Sometime by mistakes all file permissions get changed and you need to restore file permission. For example a shell script or some sort of corruption could change the permissions for packages (installed files), it may be necessary to reset them. For example a long time ago my shell script run chmod and chown commands on […]


Security-Enhanced Linux (SELinux) is a Linux mandatory access controls, through the use of Linux Security Modules (LSM) in the Linux kernel. SELinux is enabled by default in RHEL 5 / CentOS 5 / Fedora etc. But many admin disabled it due to troubles and hard configuration options. So if you are afraid of SELinux, try […]


New Linux user often get this error. Let us say you haved downloaded the RPM file from net and saved to /tmp, you may get error – no no such file or directory – when the file is really downloaded and ls command can show the same. Answer is pretty simple rpm command needs the […]


CentOS / Fedora Core / RHEL 5 uses yum for software management. Yum allows you to add a new repository as a source to install binary software. Understanding yum repository yum repository configured using /etc/yum.conf file. Additional configuration files are also read from the directories set by the reposdir option (default is /etc/yum.repos.d and /etc/yum/repos.d. […]


In this tutorial yo0u will learn about Installing SSL Certificate (Secure Server Certificate) to secure communication between Postfix SMTP server and mail client such as Outlook or Thunderbird.