29 FAQ tagged "CentOS"

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Redhat / CentOS / Fedora Linux Install XCache for PHP 5
Q. How do I install Xcache opcode cacher for PHP 5 under RHEL / CentOS version 5.0 server?
A. XCache is a open-source opcode cacher, which means that it accelerates the performance of PHP on servers. It optimizes performance by removing the compilation time of PHP scripts by caching the compiled state of PHP scripts [...]
Lighttpd as you compiled without pcre support error and solution
Q. I’m using lighttpd under CentOS 5 and getting the following error:
…can’t handle ‘$HTTP[url] =~ …’ as you compiled without pcre support.
My question is What is pcre support, and how do I solve this problem?
A. Pcre is nothing but Perl-compatible regular expression library. PCRE has its own native API, but a set of “wrapper” functions [...]
CentOS / RHEL Linux Install Postgresql Database Server
Q. How do I install and configure Postgresql database server under Red hat Enterprise Linux 5 / CentOS 5 / Fedora Linux?
A. The postgresql-server package includes the programs needed to create and run a PostgreSQL server, which will in turn allow you to create
and maintain PostgreSQL databases. PostgreSQL is an advanced Object-Relational database management [...]
Fedora / CentOS / RHEL Linux change default desktop or display manager
Q. How do I change default desktop / display manager under CentOS or Fedora Linux? I’d like to change default GNOME to KDE as desktop manager for all users.
A. There is a configuration file called /etc/sysconfig/desktop. This file defines default display manager and desktop name.
Display manager can be any one of the following:
[a] gnome (gdm)
[b] [...]
How to: Create Files in Linux from a Bash Shell Prompt
Q. I’m new to Linux and installed CentOS on my Laptop. How do I create a file from bash prompt without using GUI tools?
A. Linux / UNIX offer many command line tools and text editors for creating text files. You can use vi or JOE text editor. It is a terminal-based text editor for Linux/Unix [...]
List or Check Installed Linux Kernels
Q. How do I list all installed kernel on Linux operating system? How do I find out current kernel version?
A. You can use standard package listing command to list installed kernels.
RedHat / CentOS / RHEL / Fedora Linux user
You need to use standard rpm command to list installed software. Type the following command at [...]
Linux disable unneeded modules in Apache to save memory
Q. How do I disable unneeded Apache modules under Debian Linux?
A. You can disable all unneeded modules in Apache to save memory and improve performance. This may also result into improved security. Different Linux distribution follows different methods for disabling modules.
Debian / Ubuntu Linux disable a module
Debian / Ubuntu Linux comes with two scripts:
(a) a2enmod [...]
Redhat / CentOS Linux list all packages available for installation
Q. How do I list all packages available for installation from Internet using Red Hat Enterprise Linux or CentOS 5?
A. You can yum command and it has option to show a list of all packages that are not presently installed and can be installed via RHN or Internet.
yum list available
yum list available [...]
Redhat enterprise Linux / CentOS installing kernel source code
Q. How do I install Linux kernel source code and headers under RHEL 5 or CentOS 5 Linux operating system?
A. Both CentOS and RHEL 5 includes following packages:
a) Kernel-headers : It includes the C header files that specify the interface between the Linux kernel and userspace libraries and programs. The header files define structures [...]
update-rc.d like command on Redhat Enterprise / CentOS Linux
I’m using Debian Linux for last 4 years. I’m not able to find out update-rc.d like command ( install and remove System-V style init script links) on Redhat enterprise Linux (RHEL 5). Can you specify equivalent command for the same task?