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Configuring New vSphere Web Client Session Timeout

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Just like you could in the old vSphere C# Client, users can also configure a session timeout for the new vSphere Web Client in the latest release of vSphere 5.1. This not only ensures that idle sessions automatically disconnect after a certain period of time but also helps reduce the resources consumed on the vCenter Server as each session allocates a certain amount of resources.

To configure the session timeout, you will need to login to the server running the vSphere Web Client service (which is usually your vCenter Server) and find the webclient.properties file and change the default timeout and then restart the vSphere Web Client service. For the VCSA, the default timeout value is 120 minutes and I assume it is the same default for the Windows vCenter Server.

Step 1 - Locate the webclient.properties file:

    VCSA 5.x

/var/lib/vmware/vsphere-client/webclient.properties

    VCSA 6.x

/etc/vmware/vsphere-client/webclient.properties

    Windows vCenter Server 5.x

%ALLUSERPROFILE%\VMware\vCenterServer\cfg\vsphere-client\webclient.properties

    Windows vCenter Server 6.x

%ALLUSERPROFILE%\VMware\vSphere Web Client\webclient.properties

Step 2 - Un-comment and change session.timeout value to desired value:

session.timeout = 120

Step 3 - Restart the vSphere Web Client Service:

/etc/init.d/vsphere-client restart

You will need to restart the vSphere Web Client service for the changes to go into effect. For the Windows vCenter Server, just restart the vSphere Web Client service and for the VCSA, run the above command.

In my lab, I configured the time out to be 1 minute, once the session has gone idle for the configured period, you will automatically be logged out and brought back to login page with the following message:

 

Creating SE Sparse Linked Clones Using the vSphere 5.1 API

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In my previous article, I showed you how you can easily create your own SE Sparse (Space-Efficient) disks for you virtual machines running on vSphere 5.1. In addition to just creating new virtual disks using the new disk format, you can also create SE Sparse Linked Clones by leveraging the vSphere 5.1 API. I had previously shared a vSphere SDK for Perl sample script called vGhettoLinkedClone.pl that allows you to create your own Linked Clones and I have updated the script to now support the new SE Sparse disk format.

The script now includes new parameter called --convert which allows you to specify whether or not the destination Linked Clone should follow the same source virtual disk format or the new SE Sparse disk format. Remember to upgrade your VMs to the latest ESXi 5.1 compatibility and later (virtual hardware version 9) if you wish to leverage the new SE Sparse disk format. The way this is accomplished is by specifying a new disk backing  VirtualDiskFlatVer2BackingInfo in the VirtualMachineRelocateSpec and passing in the deltaDiskFormat to be of type seSparseFormat.

Disclaimer: This is for educational purposes only, this is not officially supported by VMware. Please test this in a development environment before using it on actual systems.

Note: Linked Clones is a feature of vCenter Server, make sure you are connecting to a vCenter Server 5.1

If you have a VM that has a VMDK that is NOT an SE Sparse disk format but wish to create Linked Clones with the new SE Sparse disk format, then you can use the --convert sesparse option, here is an example command:

./vGhettoLinkedClone.pl --server vcenter51-1.primp-industries.com --username root --vmname Regular-VM --vmname_destination Linkedclone-SeSparse-Destination --snapname pristine --vmhost vesxi51-1.primp-industries.com --datastore datastore1 --convert sesparse

If you have a VM that has a VMDK that IS an SE Sparse disk format and you wish to create Linked Clones with the same disk format, then you can use the --convert source option, here is an example command:

./vGhettoLinkedClone.pl --server vcenter51-1.primp-industries.com --username root --vmname SeSparse-VM --vmname_destination Linkedclone-SeSparse-Destination --snapname pristine --vmhost vesxi51-1.primp-industries.com --datastore datastore1 --convert source

If we head over to our vSphere Web Client and take a look at our new Linked Clones, we can confirm their virtual disks is using the new SE Sparse disk format.

OVF Runtime Environment

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I recently noticed a trend of questions from various users about extracting specific bits of information such as the version of ESXi that's running or the MoRef ID of the VM, all while within the guestOS. I had already written an article about this topic awhile back called How to extract host information from within a VM? but it seems like there is still a continued interest to easily obtain this information about the underlying vSphere infrastructure from within the guestOS.

I came across another method while researching a different topic which is to use the vApp property of a VM called the OVF runtime environment. This is a feature that has been around since the early days of vSphere 4.x, if not earlier which provides a mechanism to retrieve some of this information as well as custom properties. The OVF feature provides users with the capability to pass in any type of metadata information such as application start up parameters, network configuration, password management, etc. directly into the guestOS for flexible guest customization.

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