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Old 05-09-2008, 12:58 AM   #1
Registered: Jul 2007
Location: Penang , Malaysia.
Distribution: red hat linux
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Smile how to update the security patch for linux OS.

Hi, windows system OS, we can update the security patch from windows update website or download a *.exe file to update to windows system. RHEL5(redhat) if have subscribe to redhat than how to update the security patch like windows, or if not subscribe than how to update.Centos how to update the security patch.
Thank you.
Old 05-09-2008, 02:00 AM   #2
Simon Bridge
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In RHEL/CentOS you do not get "security patches" on patch Tuesday like with Windows. Instead, patches are called "updates" and you are offered them as soon as they are ready - often the same day as the fix. There are also many more of them a month, and they are smaller.

Some updates will be called "security updates", and they will have their own repositories online.

A solo fat client will have updates managed by up2date (RHEL) or YUM (CentOS) which will be configured to check the repositories regularly (usually daily) for a list of available updates. This is the default action - and needs an internet connection. The user is notified by an icon in the toolbar when an update is available.

In a production environment, it is usual to set one machine as a local repository and have all the computers on the network get their security updates from that - usually automatically.
Old 05-09-2008, 11:18 AM   #3
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I THINK as of RHEL5, RH uses yum as well. RHEL4 CAN be set up to use yum with Centos repos as a source. If the auto check has been shut off (many would consider this a good idea, including me) one can (as root);

yum check update


yum update
The first will give you a list of the packages purposed for updates and the second will update.
Old 05-09-2008, 07:46 PM   #4
Simon Bridge
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From the RHEL5 Release Notes:
up2date and yum

up2date is being deprecated in favor of yum (Yellowdog Updater Modified). As such, it is advisable that you revise any up2date-dependent scripts your system is using accordingly. For more information about yum, consult its man page with the command man yum; you can also consult the installed documentation under the directories /usr/share/doc/yum-<version> and /usr/share/doc/yum-metadata-parser-<version> (replace <version> with the corresponding version of yum and yum-metadata-parser installed).
... good heads-up there lazlow


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