There are a few ways to find the name of the package that installed a particular file on the system. We can use yum, repoquery or the rpm commands to find the name of the package for a particular file.Read More →
There is a couple of ways to find the list of files installed by an RPM package. We can use the “rpm” command or use “repoquery” provided by the yum-utils packageRead More →
When you need to download an RPM package and/or its dependencies available on a YUM repo, you can use yumdownloader to either download or obtain the download URLs for the RPM packages. For example, if you have a server in DMZ with YUM broken or without access to the repo then this tip would be very useful to download and copy over to the target server. This will work on RHEL/CentOS 5,6 and 7Read More →
GAB (Group membership and Atomic Broadcast) is responsible for cluster membership and cluster communication in Symantec CFS and VCS clusters. It relies on the LLT (Low Latency Protocol) for these cluster communications.Read More →
Starting RHEL7, Single user mode requires one to login with the root password as a security lockdown. However, in RHEL6/5 and earlier, single user mode by default would provide root shell. This is a security hole that most corporate would want to fix/harden to ensure there is no malice and compliance to much of regulatory requirements.Read More →
This is a quick tip on how to remove file extension from a filename. Lets say filename is redhat.csv and for us to extract the file name only and leave out the extension. There is a couple of ways to do itRead More →
Once a disk/lun is no longer required, it is a good practice to remove the disks cleanly from the system and tidy up. What more? this can be done without a server reboot.Read More →
There is a simple way to scan and import new disks or LUNS in Linux without having to reboot a server or system. This works on RHEL/Centos (tested on 5 and 6) and Fedora.Read More →
As in most if not all Volume managers, it is possible to move data (Physical Extents) from one disk to another in LVM and is quite simple to do. Also, we can move data from multiple disks or partitions (PVs) onto a single or multiple disksRead More →
I recently came across a situation where Apache Tomcat cannot start as there was no memory available to allocate to the Java heap (-Xms 1024) when the server had 8GB of physical memory installed. We all know the Linux Kernel borrows unused memory on the system for Disk Cache and releases it when an application needs it. Sadly, things didn’t work out this time and I blame it on Java.Read More →
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