code screenshot
git rebase squash

Squashing GIT Commits

When you are working with version control. You may have multiple commits that you would like to combine into a single commit. Or perhaps you want to change their order, etc… First you need to determine how far back you want to go. Open a command prompt or terminal window, navigate to your Git Repository. …

laptop in front of brick wall
Virtualization VMware

Virtual machine(s) invalid in vCenter

Sometimes virtual machines within your VMWare environment may show up as invalid. The machine is in-fact still running at this point; but you are unable to manage the virtual machine. This can happen for a few reasons, but in my experience the most common is when the esx host is unable to access the storage.

I have seen this caused by high latency when accessing an NFS datastore, when you leave an offline datastore mounted for an extended period, and I have also seen this happen when a SAN controller failover event occurs.

This condition happens when the esx host cannot access the vmx file (vmware configuration file) in the datastore, so VMWare just sort of forgets the configuration of the machine. The process which runs the virtual machine is still running on the host, so your VM does not crash. But, you still need to recover since HA, DRS, etc… no longer work when the VM is in this state.

glasses in front of computer screen
Scripts

Scripting Basics

Scripting is a very useful skill which will save any Sysadmin a lot of time. Who wants to go to every device in their environment and perform the same task over and over again? In this posting I will cover a few basics for those getting started in scripting.