Archive for the 'RedHat/Fedora Linux' Category

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• Linux: Should You Use Twice the Amount of Ram as Swap Space?
  

  Linux and other Unix-like operating systems use the term “swap” to describe both the act of moving memory pages between RAM and disk, and the region of a disk the pages are stored on. It is common to use a whole partition of a hard disk for swapping. However, with the 2.6 Linux kernel, swap files are just as fast as swap partitions. Now, many admins (both Windows and Linux/UNIX) follow an old rule of thumb that your swap partition should be twice the size of your main system RAM. Let us say I’ve 32GB RAM, should I set swap space to 64 GB? Is 64 GB of swap space really required? How big should your Linux / UNIX swap space be?

• HowTo: Authenticate Linux Clients with Microsoft Active Directory
  

  Every IT shop has a mix of Windows and Linux system. Sometime you need to authenticate your Linux desktop system against Microsoft Active Directory service. You can save time, effort and IT infrastructure by sharing authentication server. This article explains how to setup the Linux desktop computers with Active Directory using Samba and winbind.

• Linux / UNIX: Find Out If a Directory Exists or Not
  

  I’ve already written a small tutorial about finding out if a file exists or not under Linux / UNIX bash shell. However, couple of our regular readers like to know more about a directory checking using if and test shell command.

• mount forcedirectio: Disable Linux CIFS / NFS Client Caching
  

  If your network is heavily loaded you may see some problem with Common Internet File System (CIFS) and NFS under Linux. By default Linux CIFS mount command will try to cache files open by the client. You can use mount option forcedirectio when mounting the CIFS filesystem to disable caching on the CIFS client. This is tested with NETAPP and other storage devices and Novell, CentOS, UNIX and Red Hat Linux systems. This is the only way to avoid data mis-compare and problems.

• Top 10 Best Cheat Sheets and Tutorials for Linux / UNIX Commands
  

  Cheat sheet act as a reference tool which provides cut and paste kind of commands to complete a specific task. I often recommend following set of best cheat sheets to students and IT professionals. It include Linux / UNIX command and shell scripting.

• Red Hat Enterprise Linux 5 IMPORTANT Security Update [ 4-Nov-2008 ]
  

  Red Hat today released kernel updates to fix at least 15 security flaws in its core called Linux kernel. RHEL users can grab the latest updates from RHN website or by simply running yum update command. This update has been rated as having important security impact.

• pssh: Run Command On Multiple SSH Servers
  

  I’ve already written about tentakel tool and shell script hack to run a single command on multiple Linux / UNIX / BSD server. This is useful to save time and run UNIX commands on multiple machines. Linux.com has published an article about a new tool called pssh:

  If you want to increase your productivity with SSH, you can try a tool that lets you run commands on more than one remote machine at the same time. Parallel ssh, Cluster SSH, and ClusterIt let you specify commands in a single terminal window and send them to a collection of remote machines where they can be executed.

• Best Open Source Identity Management Solution: Red Hat Directory Server
  

  Red Hat Directory Server (RHDS) wins “Best Identity Management Solution” at “SIIA’s 2008 Codie” awards. RHDS is based upon the Fedora Directory Server (FDS), which is an LDAP (Lightweight Directory Access Protocol) server developed by Red Hat, as part of Red Hat’s community-supported Fedora Project. Fedora Directory Server is identical to the Red Hat Directory Server (rebranded version).

• RAID 5 vs RAID 10: Recommended RAID For Safety and Performance
  

  A Redundant Array of Independent Drives (or Disks), also known as Redundant Array of Inexpensive Drives (or Disks) (RAID) is an term for data storage schemes that divide and/or replicate data among multiple hard drives. RAID can be designed to provide increased data reliability or increased I/O performance, though one goal may compromise the other. There are 10 RAID level. But which one is recommended for data safety and performance considering that hard drives are commodity priced?

• Nagios: System and Network Monitoring Book
  

  The convenience and reliability that monitoring programs offer system administrators is astounding. Whether at home, commuting, or on vacation, admins can continuously monitor their networks, learning of issues long before they become catastrophes.

  Nagios, the most popular open source solution for system and network monitoring, is extremely robust, but it’s also intensely complex.

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