Memcached

[bmarks]

This seems promising but I know nothing about it. I wonder what kind of performance impact we can expect by implementing this (in a clustered environment.)

[Sonic84]

I just found out yesterday that JAMF is requiring this 3rd party app for my environment. However I only found this out after running into major issues with JSS 9.96 and escalating to JAMF for help.

Here's JAMF's KB on the service.

The release notes for JSS 9.93 mention needing a cacheing server if your JSS is clustered, however there is no mention of it in the 9.96 release notes.

[CasperSally]

FYI Jamf support told me today "For our memcache preferences, we suggest holding off for now. We aren't entirely sure what the plans are going to be with this in the future, so until we lock down exactly what we are going to be doing with the memcache servers, lets hold off."

[Sonic84]

"Memcached Future Requirement for Clustered Environments
In the Casper Suite v9.98, Memcached is recommended, but not yet required. In future versions of the Casper Suite, Memcached will be required for clustered environments. To prepare for this change, it is recommended that you review the following information:

Memcached Configuration for Clustered JSS Environments
Securing Your JSS"

I really hope Jamf steps up and builds an actual installer for this... having customer build a external product from source all the time is a PITA.

[coreythomas]

I'd second an installer of some kind.

I have serious concerns as to how this will affect my internal/DMZ clustered setup. Our security team is not going to be happy about allowing some open source in-memory application across our firewall. I really hope the design for this is considering clusters with nodes in a DMZ and the security concerns. I also hope they are providing documentation as to exactly which ports Memcached uses and how the communication is secured. The memcache website doesn't look very professional...

[kerouak]

Anyone??

Does this need to beset as a unique for each Web App??

Unique id required when sharing memcached endpoints with two different JSS apps

memcached.uniqueId=JAMF

So: INTERNAL MASTER JSS: JAMF DMZ JSS: JAMF1

??
Again, not enough information in the Jamf Installation notes.... SADLY!

[talkingmoose]

I'm investigating this setting for one of our tech writers and hoping someone can help me find the documentation for this setting. I've browsed the Memcached Documentation (they don't seem to have a search function that I can find) tried using Google and DuckDuckGo to find that settings specifically on the site.

If someone could point me to official documentation for this setting, I would appreciate it. Even if it's within the software itself.

[gda]

memcached.uniqueId=JAMF

Where do you get this settings from?

I'm pretty sure, I've never configured this in my environment.

[kerouak]

memcached.properties file

>> # Unique id required when sharing memcached endpoints with two different JSS apps

memcached.uniqueId=JAMF

[gda]

Ah, ok. Got your point.

I didn't change the uniqueId in my env. I've a full JSS and a limited JSS sharing the same memcached instance.
I think the setting will take effect, when you host multiple JSS webapps on one server.

But your are right. Jamf needs to document that. :)

[marklamont]

memcached.uniqueId=JAMF this is used if you have multiple jss instances, e.g. Prod and Dev. It is only required if you want to share the memcached servers rather than have individual dedicated ones. In the example all the Prod webapps have the uniqueid set to *prod and all the dev servers set to dev. This tags the cached data to the required destination system.

Obviously if you share memcached servers bump the allocated RAM up to allow for this.

[R_C]

6 years later and JAMFs documentation still fails. Old comments save the day!

[prbsparx]

Anyone wanting a bit more security in memcache: https://www.jamf.com/jamf-nation/feature-requests/7952/add-memcached-sasl-support