I recently asked this question on MongoDB JIRA. Here's the answer:
There are at least three ways to find out if you are using Enterprise, I will leave this to you to determine the easiest for your case:
1) In recent versions of Ops Manager / Cloud Manager, the token is placed after the version number as "-ent". For example, 2.6.11 will display as "2.6.11-ent."
2) In the Mongo shell, you can check the connected server by running db.serverBuildInfo (). gitVersion. Example output on 2.6.9:
>db.serverBuildInfo().gitVersion df313bc75aa94d192330cb92756fc486ea604e64 modules: enterprise
Please note that "modules: enterprise" is displayed only for Enterprise versions.
3) If you have only a binary file, you can check the version with the -version flag on the command line. For instance:
mongod --version db version v2.6.9 git version: df313bc75aa94d192330cb92756fc486ea604e64 modules: enterprise OpenSSL version: OpenSSL 1.0.1m-fips 19 Mar 2015
Please note that "modules: enterprise" is displayed only for Enterprise versions.
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