Archive for the ‘Articles’ Category

How to display security updates by yum

Monday, December 7th, 2009

Ref: http://magazine.redhat.com/2008/01/16/tips-and-tricks-yum-security/ Ref: http://www.cyberciti.biz/faq/redhat-fedora-centos-linux-yum-installs-security-updates/ Install Plugin Type the following command: # yum install yum-security How Do I Display Available Security Updates? Type the following command: # yum list-security Sample Outputs: Loaded plugins: rhnplugin, security RHSA-2009:1148-1 security httpd-2.2.3-22.el5_3.2.x86_64 RHSA-2009:1148-1 security httpd-devel-2.2.3-22.el5_3.2.i386 RHSA-2009:1148-1 security httpd-manual-2.2.3-22.el5_3.2.x86_64 RHSA-2009:1148-1 security mod_ssl-1:2.2.3-22.el5_3.2.x86_64 list-security done To list all updates that are security [...]

Critical vulnerability in the Linux kernel affects all versions since 2001

Thursday, August 27th, 2009

Ref :http://www.h-online.com/security/Red-Hat-Novell-and-CentOS-update-for-kernel-vulnerability-Update–/news/114072 Google security specialists Tavis Ormandy and Julien Tiennes report that a critical security vulnerability in the Linux kernel affects all versions of 2.4 and 2.6 since 2001, on all architectures. The vulnerability enables users with limited rights to get root rights on the system. The cause is a NULL pointer dereference in connection [...]

How to Rebuilding failed Linux software RAID

Friday, August 14th, 2009

Ref: http://aplawrence.com/Linux/rebuildraid.html Recently I had a hard drive fail. It was part of a Linux software RAID 1 (mirrored drives), so we lost no data, and just needed to replace hardware. However, the raid does requires rebuilding. A hardware array would usually automatically rebuild upon drive replacement, but this needed some help. When you look [...]