d-fens GmbH
Audit and Consulting of Information Systems and Business Processes
I am a senior auditor, consultant and architect at d-fens for business processes and information systems.
We recently had a customer who wanted an automatic approval of machine requests after a specific time span when no other approver would have rejected the request. On the other hand he wanted an automatic rejection of machine requests after a defined idle time for machine types that used large amount of resources (as the resource is still being reserved […]
When provisioning a server via PXE or ISO install you might run into a problem where you see your machines being in an ‘Installing OS’ state (between ‘BuildingMachine’ and ‘MachineProvisioned’) though the actual installation has finished long time ago. This might be because the ‘Guest Agent’ is either not installed on the image/machine or because there is no connectivity between […]
Here is a quick script on how to login to ServiceMesh AgilityPlatform. Never heard of the product? don’t bother. It works nevertheless … Subsequent calls to AgilityPlatform are then execeuted like this (eg list all projects on the platform): An easy way to check if the login session is still valid is to issue the following request: You should receive […]
When you try to convert an ip address string into an [IPAddress] object you might end up with a different address than expected. This can happen if you use the ‘leading zero’ notation for IPv4 addresse (which is not really correct, but easier to sort alphabetically). When you create an [IPAddress] with that kind address style, the constructor does internally […]
As quickly described in a previous post, the ‘AddQueryOption()’ in the vCAC WCF DataService is flawed and does not allow you to narrow queries and thus leads to massive performance penalties when working with larger installations. However, there is a workaround for this: you can use native ODATA REST calls and convert the result into a native .NET vCAC ManagementModelEntities […]
Another gotcha you might run into when you try to install vCAC 5.2 Hotfix 5 … When you try to install the hotfix on a repo server that only accepts HTTPS/SSL connections you might encounter the following error: This is because somehow the installer only tries to access the repo via HTTP. In this case you stop the installer, go […]
When you install vCAC 5.2 Hotfix 5 you certainly have to install this on all componentens and systems running any piece of vCAC software. However, there is a scenario when this is not enough, or you have to do some manual adjustments. You will remember, that when you first installed vCAC 5.2, you had to ‘install’ the ‘Model Manager Data’ […]
[UPDATE 2014-08-11] See note below for a workaround on this. vCAC provides access to its data model via an ODATA REST interface that is based on the Microsoft .NET Entity Framework. Access to this interface is encapsulated and abstracted via the EF DataService that is exposed via the ModelManagerEntities object. For more information you can check some of my earlier […]
vCAC 5.2 Hotfix 5 is available. This hotfix addresses a lot of issues that were unfortunately introduced with hotfix 4. So it might be a good invest testing it to see if things are gone… A backup of your infrastructure prior installing it is highly recommended as a restore is not really possible. So you best test it thoroughly in […]
When using the static IP service in vCAC 5.2 you might come to a suprise after you installed vCAC 5.2 Hotfix 4 (HF4), because – it no longer works… VMware Support is informed about this and will fix it in HF5. Until then you either do not use this feature any more or use a workaround to “manually” assign the […]
Today another NoBrainer how you can use PowerShell to do some currency conversions on the fly. The example shown here uses the OANDA(R) currency converter (Note: please read the terms of use if you are entitled to use the API or the web site in a programmatic way.) See Gist at https://gist.github.com/dfch/d5990fdb391fe1b84b76
Sometimes I have to write scripts that are executed interactively and actually watched by operators as they progress – I know this sounds strange enough. In these rare cases I […]
When rolling your own Cmdlets you will probably want to expand your module over time possibly adding or editing functions. I order to keep your Cmdlet as a function and not having to reload the module on every code change you can use Splatting (which requires at least PowerShell v3) to simplify developement and debugging. All you have to do […]
When using https request (directly or indirectly) with PowerShell you might run into different errors when using non-standard (i.e. not trusted, expired, self-signed etc) certificates: The underlying connection was closed: Could not establish trust relationship for the SSL/TLS secure channel. The underlying connection was closed: An unexpected error occurred on a send. In either case you will find plenty of […]
I totally missed that! So my surprise was even bigger: vCO now has an interactive Shell (vCO-Cli) just like Python and PowerShell. Ok, maybe not really like them; but at […]
When working with the vCAC MgmtContext from within PowerShell or whatever other .NET language you will probably have noticed two properies on the context called ‘Entities’ and ‘Links’. Whenever you make a call like ‘$vm = m.VirtualMachines |? VirtualMachineName -eq “server1″‘ the DataContext is tracking the queries objects and thus adding them to the two aforementioned properties (that are actually […]
d-fens GmbH 