Here we'll resolve the common Fedora / RHEL 7 network startup issue: Failed to start LSB: Bring up/down networking This error is accompanied by a number of subissues: Device eth0 has different MAC address than expected, ignoring. RTNETLINK answers: File exists For the first issue, ensure that your definition in the ifcfg-eth0 file really matches […]

Delay in booting up after pressing power button If your laptop or pc or server shows a long delay in booting after pressing the power button, it's possible it could be underpowered.  I realized mine was 600W and after changing some green for non-green hard drives, the bootup after a cold start was taking longer […]

In most distributions including RH / SL (Scientific Linux) / CentOS / Fedora / Ubuntu / MintLinux the following commands can be used to achieve this purpose: find . -type f -size +10000k find /root/ -type f -size +10000k -exec ls -altri {} \; find . -type f -size +10000k -exec ls -altri {} \; […]

We got the B7006971 error from our HBA card on a P5 Server.  Turns out that upgrading the firmware of our HBA did the trick.  To do so add / remove the card using the Add FRU / Remove FRU or Exchange FRU in the HMC then from the OS issue the following after downloading the […]

Here's an example of a clean prompt for use in AIX in a mixed-environment setup: PS1="[ $(uname) $(whoami)@${HOSTNAME}:\$PWD ] " export PS1 set -o vi Looks like this: [ AIX root@mdsnim01 : guest ] Cheers, TK REF: Softpanorama KSH Substitutions

If you've just installed AIX from CD, there is no SSH / SSL.  Getting and compiling one from the web proved to be challenging.  Here's the steps to do so: mount -V cdrfs -o ro /dev/cd0  /cdrw cd /cdrw/installp/ppc smit installp Install Software * INPUT device / directory for software           […]

This is a set of running notes on configuring a Cisco 3750G POE Switch.  It's very very messy and is meant for me to remember the ins and outs of doing this.  Along the way, it could help someone else too. First use a console connection to your switch.  The console is unaffected by what […]

When I saw Failed to recv data from socket. from my VNC client and Network error: Software caused connection abort I immediately ran an arp scan to check for duplicate IP's:

Recently I got the following at boot time of my RHEL clone (Scientific Linux 6.7), There are differences between boot sector and its backup, after which I was dumped into the maintenance console asked to type a password for maintenance and perform brain surgery.  Naturally I wondered if my recent attempts to create a bootable UEFI […]

I've destroyed quite a few disks because the Linux kernel randomizes their mount points at each startup.  So writing persistent mount rules using /etc/fstab is pointless because you never know where each one will be mounted after repeat reboots.  We can achieve this in a different manner by using the following logic to determine their […]