‘centos’ topic list

Update CentOS 4 to CentOS 5 remotely

December 31st, 2009

I just successfully updated my Dell PowerEdge 1850 from CentOS 4.8 to CentOS 5.4, luckily the issues I faced were not so rare. The steps I used are listed below, may it helpful for you as well! Although this post is mainly intended for CentOS it should work on RHEL systems as well.

Before you start, A word of advice i believe most experienced RHEL/CentOS users will show you regarding what you’re thinking:

Upgrade between minor versions (i.e. CentOS 5.2 -> 5.3 -> 5.4, or even 5.0 -> 5.4) YES
Upgrade between major system versions (i.e. CentOS 4.8 to CentOS 5.4) NO » Read more: Update CentOS 4 to CentOS 5 remotely

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Posted in Cmd Reviews, System Tuning

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Avoid IP conflicts in Xen DomU

November 12th, 2009

Recently I’m playing with Xen virtualization, and I came across one protential problem. As I need to share my guest machines to clients,  I must give them root privileges… that’s whats VPS-es all about… having root access to OS without having to purchase expensive physical ones.  So having that in mind they are by default untrusted and unpredictable. Probably only god knows what they will do on their VMs! » Read more: Avoid IP conflicts in Xen DomU

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Posted in Virtualization

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Set system variables in Debian and CentOS

October 30th, 2009

As indicated in title, this request is probably very common for sysadmins.

For example, when a Java environment is ready, we need to make sure that JAVA_HOME is globally available for some system accounts, so that they can restart java instance smoothly. » Read more: Set system variables in Debian and CentOS

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Posted in Debian Linux, Programming, System Tuning

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CentOS-5.4 i386 and x86_64 Released

October 23rd, 2009

CentOS community annouced the availability of CentOS-5.4 for i386 and x86_64 Architectures this week. It’s based on the upstream release Redhat Enterprise Linux 5.4.0 and includes packages from all variants including Server and Client.

This is just an announcement email, not the release notes. The Release Notes for CentOS-5.4 can be found on-line at wiki.centos.org. » Read more: CentOS-5.4 i386 and x86_64 Released

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Posted in Open Source

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Convert RHEL 5 to CentOS 5

October 20th, 2009

Recently I was working on a Dell PE1950 at work and decided to get Xen installed, so that I can create some virtual servers for our developers.

Finding out that Xen in Redhat Enterprise Linux is not so easy to download – I cannot find it from any public accessible websites, I decided to use CentOS’s yum repoes to download and install Xen. When I have CentOS yum repo created in /etc/yum.repo.d, I noticed that it cannot work in RHEL – It cannot recognize OS version without some updates of application. » Read more: Convert RHEL 5 to CentOS 5

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Posted in Open Source, System Tuning

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Install Windows XP in Xen CentOS

October 17th, 2009

In a former post, we know how to use OpenVZ to create virtual system in CentOS, this article will show you how to install Windows under Xen on CentOS 5.3.

We fixed one of the problems of Windows XP under Xen. Windows XP’s inability to shut itself down completely. Windows ends up on the ‘it is safe to turn off your computer’ screen, but the virtual machine is not destroyed. See XenWindowsACPI for a summary. » Read more: Install Windows XP in Xen CentOS

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Posted in Virtualization

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OpenVZ On CentOS 5.4 installation and configuration

October 14th, 2009

This article will describe how to create OpenVZ container in CentOS 5.4. With OpenVZ you can create multiple Virtual Private Servers (VPS) on same hardware machine and running them simultaneously and efficiently.

OpenVZ is the open-source branch of Virtuozzo, a commercial virtualization solution widely used by hosting providers. The OpenVZ kernel patch is licensed under GPL license, and the user-level tools are under the QPL license.
» Read more: OpenVZ On CentOS 5.4 installation and configuration

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Posted in Open Source, Virtualization

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How to skip broken dependencies when Upgrading System

September 11th, 2009

I made a mistake and added additional repo under CentOS / RHEL 5.x server. Now when I try to upgrade packages it gives me out broken ependencies / missing dependency error. How do I skip broken packages and apply updates to other installed software’s? » Read more: How to skip broken dependencies when Upgrading System

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Posted in System Tuning

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