In the previous part of this series (Alarm expressions – Part 1 : Metric alarms) I showed how you could create alarms that are triggered when a metric crosses a watermark.
In this part I will show you how to create alarms when one or more specific events occur in your vSphere environment. More specifically I will show you how to create an alarm that will fire when someone adds or removes a license from your vCenter.
In a previous entry (Scripts for Yellow Bricks’ advise: Thin Provisioning alarm & eagerZeroedThick) I showed how you could use performance metrics to fire an alarm. The MetricAlarmExpression in that script requires a PerfMetricId to specify which performance metric the alarm should monitor. The counterId in that object is an integer and it is perhaps not too obvious which value corresponds with which metric.
This blog entry shows how you can quickly get a list of permitted counterIds (and instances) for a specific entity. And it will show how to create some “impossible” alarms !
In the Developer forum there was an interesting post called Resources for folks new to the vSphere Web Services SDK. Now unfortunately the Hello World guide was (again) only aimed at Java programmers.
Although PowerCLI is nearing perfection, you sometimes will have to go to the SDK methods and properties to make your script go that extra mile. Since I know, from first-hand experience, that the first steps in the SDK are not that simple for PowerShell programmers/scripters I decided to start a series to make the SDK more accessible for the PS people.
In a previous entry (see Events: a great source of information – Part 1) I showed how to use the VmCreatedEvent event to find out which guests were created longer than 30 days ago.
In the vSphere SDK documentation there are currently 432 events listed. That makes it sometimes hard to decide which event(s) to use for your reporting/auditing needs.
But luckily there are some tricks to make it easier on you.
The PowerCLI Team yesterday published with the Onyx Project a great tool with lots of potential. The blogging community received Carter’s announcement enthousiastically (see for example The Onyx has landed).
As a casual PowerCLI user you might think, the product has a strange name but it is the answer to all my scripting and automation needs. Why should I bother learning all these PowerCLI cmdlets while this tools produces working code. But think again !
On the Yellow Bricks blog there was today a very interesting entry called Performance : Thin Provisioning. Besides the link to the excellent VMware document called Performance Study of VMware vStorage Thin Provisioning, Duncan also included some tips and tricks.
Since I’m in favour of automating as much as possible in my vSphere environment, I decided to have a look how all this could be scripted.
In the My PS … series of blog entries this entry lists the SnapIns and Modules I use (regularly).
Note that the following list is my personal list and that it is definitely not my aim to list all available PowerShell snapins and modules. That would be a sheer impossible task, seen the abundance of the currently available snapins and modules.
Previous entries in this series were My PS toolbelt and My PS library. Continue reading
In a recent PowerCLI Community thread someone asked how he could create Alarms with the current PowerCLI build. Since there is no PowerCLI cmdlet (yet) to create Alarms I had to fall back on the CreateAlarm method from the SDK.
The procedure as described in the vSphere Web Services SDK Programming Guide, chapter 15, is quite simple. The script I wrote created the alarm, but to my amazement I couldn’t use the Edit Settings option in the vSphere client. The option was grayed out.
First I doubted the correctness of my script but after some tests I could confirm that the alarm worked correctly. Continue reading
One of the interesting new features in vSPhere is vStorage Thin Provisioning. I’m not going to explain what Thin Provisioning is all about. For that you can consult several knowledgeable blogs (for example this entry on Virtual Geek) and/or books (for example Scott Lowe’s excellent Mastering VMware vSphere 4.0).
The problem I have with Thin Provisioning, is that there are a lot of existing guests and templates out there that were created with Thick VMDKs in the past. The only documented way I could find to convert these Thick VMDKs to Thin VMDKs was to use svMotion from the vSphere client.
Now that is not a solution I want to (or can) use in an automated environment. Continue reading