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How to setup custom vSphere Content Library on a Synology?

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The ability to run a diverse set of custom add-on applications from backup, security, multimedia, developer tools and many more directly on a Synology NAS makes it extremely versatile and can enable a number of new capabilities within your environment.


While browsing through the packages, I noticed there is a WebStation package which can be used to host a basic website (can also support advanced web applications). This immediately gave me an idea as I can now host my own custom vSphere Content Library, also referred to as a 3rd party content library that are managed outside of vCenter Server, directly on the Synology!

Note: Installing add-on applications will consume additional CPU and memory resources on your Synology, make sure you have enough resources, especially memory before running additional services on your Synology.

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How to relocate an existing vSphere Content Library from one vSphere Datastore to another?

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When you create a vSphere Content Library using vCenter Server, the content library is comprised of both the raw uploaded files (OVF, OVA, VM Templates, ISO, etc) which are stored in a vSphere Datastore and the metadata that is generated by vCenter Server for the individual files, which are stored in the vCenter Server Database (VCDB). In contrast, when an External vSphere Content Library is created, which can be backed by any HTTP(s) endpoint, both the metadata along with the raw files are stored external to the vCenter Server and is managed separately.

Today, there is not an easy way to relocate or move an existing vSphere Content Library from one vSphere Datastore to another. The process would require creating a new vSphere Content Library, then manually using either the vSphere UI or API to then copy all the files from the previous content library to the newly created one which is backed by a different vSphere Datastore.

Typically, the reason for this use case is either you are running out of storage and can not expand further or you need to decomission the underlying storage backing the content library.

Recently, I needed to look into this for my own homelab setup where I plan to rebuild one of my setup which is running on vSAN and I wanted to preserve existing content library without having to transfer content back/fourth. The context above was important as I was able to figure out this could be done with some minor tweaks to the VCDB (which I typically do not recommend touching for this reason) but for this purpose, it really is the only way which I had also confirmed with Engineering.

Disclaimer: This is not officially supported by VMware, use at your own risk.

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Benefits of VM Templates (VMTX) in vSphere Content Library

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A commonly miss-understood capability of the vSphere Content Library is managing and distributing Virtual Machine Templates (VMTX), which was introduced in vSphere 6.7 Update 2.

When vSphere Content Library was first released in vSphere 5.0, content was distributed by using a pull-based replication where the subscriber vCenter Server would setup initiate the content subscription to the publisher vCenter Server and then content would then be downloaded to the subscriber vCenter Server as shown in the diagram below.


This initial architecture of vSphere Content Library made it extremely easy for any vCenter Server, regardless of their vCenter Single Sign-On domain, to create a subscription and download content (ISO, OVF/OVA and other files) from the vSphere Content Library of the publisher vCenter Server.

The creation of the vSphere Content Library subscription was managed completely by the individual subscribing vCenter Server as long as it knew the subscription URL and any credentials that may have been configured and of course connectivity to the publisher vCenter Server. While this made it easy for anyone to subscribe content from a vSphere Content Library, it also meant for larger organizations with many vCenter Server(s), an additional task was required to configure each subscribing vCenter Server.

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