Jumlins TechBlog

The coding hell and the daily IT of Niklas Jumlin

May 13th, 2015

I recently wrote this script to schedule Memory and vCPU up/downgrades on virtual machines from a VMware PowerCLI enabled vCenter server running Windows.
The script is built upon many useful parts from a script that I found here:
http://ict-freak.nl/2010/05/07/powercli-script-to-schedule-memory-and-or-vcpu-updowngrade/

I mainly had to make changes in order for the script to be able to run from Task Scheduler. First of, the script needed to be executed as a different account, one that has permissions in your VMware Cluster to reboot and change configuration of virtual machines. So I created the user svc_sched_script in VMware vCenter and gave it enough permission.

I then needed to save the password (not in clear text) and pass it to the script somehow.

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January 9th, 2013

I found this really cool open source software that I’m currently implementing for a customer remotely.

It’s called HVBackup and is of the time of writing in Beta v1.
http://hypervbackup.codeplex.com/

Description from their website:

The main goal of this project is to provide a very easy and powerful free tool to backup and restore Hyper-V virtual machines, in standalone and clustered (CSV) environments, overcoming all the limitations that a generic tool like Diskshadow provides.

This tool targets Windows 2008, Windows 2008 R2 and Windows 8 / Windows Server 2012. All the corresponding core and free Hyper-V editions are also supported!

HVBackup supports app consistent and crash consistent backups through the Hyper V VSS writer component integrated in the operating system.

There are quite a few expensive commercial solutions on the market supporting this scenario, but this is the first open source one, based on the research we did before publishing the project.

We integrated this tool in our datacenter’s production environment management infrastructure, which means that it undergoes continuous testing in a real world environment :-)

HVBackup can be invoked from the command line, scripted with Powershell or integrated in any .Net program through it’s class library.

The backup process generates a separate zip file for each virtual machine in the specified output directory, containing all the files owned by the VM and identified for backup by the VSS Hyper-V provider.

My script for the tool is essentially the same as theirs, only that I’m slightly changing the way files are archived. Check it out below.

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May 24th, 2012

At work I was tasked with writing a script that would clean up and archive logs from an application that didn’t have any decent log rotation built-in. The application would however rotate the logs when the application’s service was restarted and then rename the old log with an incremental number suffix. So we added a scheduled task that would restart the service every night in order to get the logs rotated and free from being locked.

So what this script will do is to take any log which contains a number at the end and archive it to another location, it will then replace the archives last modified date to the original last modified date of the actual log file. After that it will simply delete archives older than X-days based on its last modified date and time.

You can of course configure the script to look for logs named in a different way. This is quite simple:

## Define files to match
$LogFileMatch = "*scplog?"
## * = Any or none characters
## ? = Any character (Must be one)

The script will log events to screen and also to a log file.
It will also log every event to Windows built-in EventLog if executed with administrator privileges.
The script will also handle all exit codes from 7-zip command-line which is the program it’s utilizing in order to archive files.

Configuration settings that can and should be edited in the script are commented at the top of the script.

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October 26th, 2010

A colleague asked me if I could write a script that would move files within a folder or its subfolders that were older than one year into a new location but still keep the directory structure.
I figured it would be quite a challenge so I decided to do it for him; kind as I am =)

As I haven’t been providing this blog with something new in a long time I figured I could make it useful to more people if I added a few things, like different date formats and other various settings.

So here it goes:
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January 5th, 2010

So I work with many servers and many customers. Usually I had to write a new backup script for every new customer and server. Therefore I figured I might as well just write a template that I can copy/paste everytime I have to implement a robocopy backup script. So here goes.

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December 23rd, 2009

I’ve already mentioned I work with many customers and servers. Everytime I install a new server that hosts printers I have to handwrite a loginscript that connects/maps the printers on the clients. So I made a template for that as well. There is only a few variables needed to change for it to rock. Check it out.

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