CentOS/RHEL 4

The Problem Messages such as the following are reported when running commands such as partprobe on a CentOS/RHEL system using LVM (Logical Volume Manager) and multipathing e.g. device-mapper-multipath or EMC PowerPath, etc.: Error: Error informing the kernel about modifications to partition /dev/sda1 — Device or resource busy. This means Linux won’t know about any changes […]

By default, /var/log/messages* are created with read-write permissions for ‘root’ user only. There might be a requirement to make the log files world readable for eg to allow an application to read and process the data in it. Changing the permissions on such files using ‘chmod’ might be a temporary solution as they will be […]

The key combination “Ctrl+Alt+Del”, when pressed on a virtual console (black-screen tty), causes the system to reboot. This is the default behavior and sometimes people don’t like this feature as it may cause accidental reboots of the system. The post provides the procedure on how to disable “alt+ctrl+del” key combination in order to prevent an […]

Question I have a new disk attached to the system. How can I create a new swap partition using this disk on the system? Solution For the purpose of this post, let’s assume that you do not have any swap configured on your system. /dev/sdc is the drive referenced with no partitions. Since we are […]