‘redhat’ 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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Set timezone date and time in Linux

December 13th, 2009

Your computer has two timepieces; a battery-backed one that is always running (a.k.a. the hardware, BIOS, or CMOS clock), and another that is maintained by the operating system currently running, it’s called system clock. This document explains how to set your system clock, your timezone, and other stuff related to how linux does its time-keeping. » Read more: Set timezone date and time in Linux

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Posted in Networking, System Tuning

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Install Dell OMSA on Redhat Enterprise Linux

November 19th, 2009

Here we listed 3 ways on the installation of Dell OpenManage Server Administrator on a Redhat Enterprise Linux, you can follows these steps on CentOS or SLES 10, they would work well.

1, Install from RPM packages
Generally we need these RPM packages, you can search and download them from Google.com.
» Read more: Install Dell OMSA on Redhat Enterprise Linux

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Posted in Cmd Reviews, Hardwares, System Tuning

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Hpasmcli Usage Example on ProLiant DL380

November 16th, 2009

Hpasmcli is short for HP System Health Application and Insight Management Agents, it’s a scriptable command line interface for interacting with the hpasm management daemons, which can be used to view / set / modify BIOS settings such as hyper-threading, boot sequence control, and UID LEDs. It can also be used to display hardware status.

In addition to the command line interface, hpasmcli is also usable for incorporating into shell scripts. The return value of hpasmcli can be used to verify a command executed successfully. » Read more: Hpasmcli Usage Example on ProLiant DL380

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Posted in Cmd Reviews, Hardwares

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Prepare the RPM Building Environment

November 9th, 2009

Some days ago, I posted some examples on the common usage of RPM. Now, this post describes a manual preparation of a RPM building environment. With the help of this environment, you can generate upated RPM packages and patch your RPM-based system from source code.
» Read more: Prepare the RPM Building Environment

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Posted in Cmd Reviews, Security

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Life Cycle of Redhat Enterprise Linux

October 2nd, 2009

The Red Hat Enterprise Linux Life Cycle is designed to reduce the level of change within each major release over time increasing predictability and decreasing maintenance costs. Every major version of Red Hat Enterprise Linux is maintained and supported independently during the life cycle. » Read more: Life Cycle of Redhat Enterprise Linux

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Posted in Open Source, Security

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How to change default I/O scheduler?

September 11th, 2009

Red Hat Enterprise Linux 3 with a 2.4 kernel base uses a single, robust, general purpose I/O elevator. The I/O schedulers provided in Red Hat Enterprise Linux 4, embedded in the 2.6 kernel, have advanced the I/O capabilities of Linux significantly. With Red Hat Enterprise Linux 4, applications can now optimize the kernel I/O at boot time, by selecting one of four different I/O schedulers to accommodate different I/O » Read more: How to change default I/O scheduler?

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Posted in System Tuning

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How to disable the IPv6 protocol?

September 11th, 2009

Mostly you just need to disable IPv6 protocol. But in some case, you do not need it at all or it may increase browsing speed. Linux has Internet Protocol Version 6 (IPv6) enabled. By default, almost all distros enable it.

Red Hat and similar ones (like Fedora and CentOS)

Open your modprob.conf file and add following lines: » Read more: How to disable the IPv6 protocol?

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Posted in Networking, System Tuning

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How do I set up hugepages in RHEL?

September 11th, 2009

Hugepages can be allocated using the /proc/sys/vm/nr_hugepages entry, or by using the sysctl command. To view the current setting using the /proc entry:
# cat /proc/sys/vm/nr_hugepages
0 » Read more: How do I set up hugepages in RHEL?

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Posted in System Tuning

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Redhat and AMD migrate VMs across CPUs

September 8th, 2009

AMD and REDHAT have just done the so called impossible, and demonstrated VM live migration across CPU architectures. Not only that, they have demonstrated it across CPU vendors, potentially commoditising server  processors. Eeek! » Read more: Redhat and AMD migrate VMs across CPUs

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Posted in Hardwares, Virtualization

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