Could not find filesystem ‘/dev/root’ at boot? Today I ran into a problem where after renaming the root (/) logical Volume and rebooted I got the following message on boot: could not find filesystem ‘/dev/root’ I had renamed the LV…
Etherchannel, Portchannel, bonding or NIC teaming? Etherchannel, portchannel, bonding, link-aggregation and NIC teaming are all terms to describe the bundling of two or more ports to form one logical Ethernet link. Ether-channel/Port-channel is the term used by Cisco convention and…
Today I ran into a problem where I wanted to find out what Linux process (PID) was listening on which port. You might A fellow sysadmin coworker showed me this command: lsof -i :port Lsof will list the PID and…
TFTP Server is often used by Cisco devices to manage their file transfers. Here is a quick guide on how to setup a TFTP server on Centos/Redhat. First obtain the RPM. In Centos, use yum to search and install tftp-server….
Have you ever wondered how to query the architecture (32bit or 64bit) or rpm version that is installed on your Linux system? Has a DBA ever come to you and asked the following: “Why is my Oracle Linux server missing…
VMware – The leading industry Virtualization Provider. It comes in two flavors VMWare ESX and VMWare Server (formerly GSX). The former comes at a cost and the latter FREE! In a low cost setup Vmware server (Free version) is the…
This link from the Redhat knowledge base talks all about it. Here’s the list of steps and pointers I had to go through. 1. Make sure that the 8021q module is loaded modprobe 8021q 2. This step is important as…
Top is amongst the most comprehensive and informative process display command in Linux. There’s no reason for a seasoned Linux sysadmin like myself not to know it! Top can display all the information you need to know about processes and…
In my Linux life, I find myself trying to search for files quite frequently. All distributions comes with a very handy command called ‘locate’ which helps you search for the file. What it does is Linux keeps an index and…