Linux

Forgot to mention kernel update

Byetzion 17/06/2006

Kernel version 2.6.16.9, so I will supply its config file here config-2.6.16.9.txt. Same procedure as before.

Good luck.

Clusters | Linux | Virtualization

RedHat 4 working cluster (on VMware) config
Byetzion 11/11/2007

I have been struggling with RH Cluster 4 with VMware fencing device. This was also a good experiance with qdiskd, the Disk Quorum directive and utilization. I have several conclusions out of this experience. First, the configuration, as is: <?xml version=”1.0″?> <cluster alias=”alpha_cluster” config_version=”17″ name=”alpha_cluster”> <quorumd interval=”1″ label=”Qdisk1″ min_score=”3″ tko=”10″ votes=”3″> <heuristic interval=”2″ program=”ping vm-server…

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Disk Storage | Linux | Scripting/Programming | Virtualization

Quick provisioning of virtual machines
Byetzion 01/02/2008

When one wants to achieve fast provisioning of virtual machines, some solutions might come into account. The one I prefer uses Linux LVM snapshot capabilities to duplicate one working machine into few.

This can happen, of course, only if the host running VMware-Server is Linux.

LVM snapshots have one vast disadvantage

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bash | Disk Storage | Linux

Target-based persistent device naming
Byetzion 22/06/2013

When Connecting Linux to a large array of SAS disks (JBOD), udev creates default persistent names in /dev/disk/by-* . These names are based on LUN ID (all disks take lun0 by default), and by path, which includes, for a pure SAS bus – the PWWN of the disks. It means that an example to such…

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Linux | Scripting/Programming

Customizing the Anaconda Installer Boot Image with product.img
Byetzion 04/02/202504/02/2025

Red Hat’s Anaconda installer, used by Red Hat Enterprise Linux, Oracle Linux, and other RHEL-like distributions, offers a powerful customization method through an additional product.img file. This technique allows you to modify the first boot sequence with relative ease. What is product.img? The product.img is an additional image file that can be used to override…

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Linux

Web server behind a web server
Byetzion 26/05/2006

I’ve acquired a new server which is to supply services to a certain group. On most cases, I would have used PREROUTE chain in my IPTABLES on my router for prerouting, based on a rule such as this: iptables -t nat -I PREROUTING -i <external_Interface_name> -p tcp -s <Some_IP_address> –dport 80 -j DNAT –to-destination <New_server_internal_IP>:80…

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Disk Storage | Linux

Linux LVM performace measurement
Byetzion 10/06/2007

Modern Linux LVM offers great abilities to maintain snapshots of existing logical volumes. Unlike NetApp “Write Anywhere File Layout” (WAFL), Linux LVM uses “Copy-on-Write” (COW) to allow snapshots. The process, in general, can be described in this pdf document. I have issues several small tests, just to get real-life estimations of what is the actual…

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