[MarkLogic Dev General] RE: Two MarkLogics on one host?

[Danny Sokolsky]

In short, it is not recommended but it is possible.  A better solution is to have 2 different computers, or if you are upgrading an application, just (after testing and backing up) upgrade to 4.x (for example, 3.2.11 > 4.0-7 > 4.1-5).

Here are some of the reasons/gotchas as to why it is not recommended. You need:

* different port numbers on each instance for the Admin Interface (8001 by default) and for xdqp (7999 by default)
* different data directories
* different MarkLogic installation directories
* different startup scripts
* you will have to do your own installation for the 2nd installation to change the above things
* upgrades will be problematic and manual
* all of the cache setting defaults assume that MarkLogic has access to the whole machine
* perhaps a few things that I have not thought of

I definitely recommend against trying this.

-Danny

From: general-bounces at developer.marklogic.com [mailto:general-bounces at developer.marklogic.com] On Behalf Of Strawn, M. Shane
Sent: Wednesday, March 17, 2010 1:21 PM
To: general at developer.marklogic.com
Subject: [MarkLogic Dev General] Two MarkLogics on one host?


Quick question re: running two instances of MarkLogic on one host:

1) is it possible?
2) if so what are the big issues/gotchas if any?
3) if you're thinking "why would you want to do that?" then what's a better solution, assuming:

 *   you may want different versions of ML (v3 vs. v4)
 *   when the taskserver stops, the other taskserver keeps on trucking - perhaps in v4 the taskserver is not so difficult to resurrect?


Thanks in advance for your comments.

M. Shane Strawn
Software Engineer
Wolters Kluwer Health
Professional and Education Division
Shane.Strawn at WoltersKluwer.com<mailto:Shane.Strawn at WoltersKluwer.com>
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