It’s really simple to configure NRPE to run under xinetd in Linux. Here’s how to install it. 1. First install nrpe using yum. Your default Redhat/CentOS distro should come with xinetd pre-installed and running. If not, install xinetd as well….
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…
Today I ran into a strange problem where I was getting a “ssh connection refused” message from putty while connecting to a Linux server via SSH. I was able to connect to the server just the day before and was…
Problem: Have you ever had the need to VPN home from your iOS compatible device such as an iPhone or iPad? By using SSH tunneling, there’s no need to setup a complex IPSEC VPN or PPTP server at home. Just…
There are a few reasons why you want to install a multiple domain certificate (UCC certs with multiple SANs) into your ASA. One of the reason is for setting up a VPN cluster, in which case each of your ASA…
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….
It’s been a while since I’ve blogged. This is the first post since I’ve moved my old blog http://springdom.blogspot.com to my new home. So I’ve decided to document what I went through. These few months I’ve been toying around owning…
Today I ran into a weird scenario where a Linux system’s NIC would set itself to 100Mb half duplex regardless whether the device and NIC was manually configured to operate at full duplex. After strolling through Cisco’s website Troubleshooting Cisco…