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  1. Core Server
  2. SERVER-10064

How does MMS know the version number of my mongod server?

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    Details

    • Type: Question
    • Status: Closed
    • Priority: Trivial - P5
    • Resolution: Works as Designed
    • Affects Version/s: None
    • Fix Version/s: None
    • Component/s: None
    • Labels:
      None
    • Environment:
      CentOS x86_64, mongod 2.2.1.

      Description

      I have 5 mongo servers in a replica set: zuemongo1, 2, 5, 6, and 7.

      MMS currently shows their versions as 2.2.1, 2.2.5, 2.2.1, 2.2.5, 2.2.5 (respectively).

      The active daemon running on all five servers is 2.2.1.

      Last night, I did some maintenance on this replicaset, and so knowing (a) I was going to bounce the dameon on each server and (b) we need to upgrade to 2.2.5 soon, I took last night as an opportunity to get the 2.2.5 binaries on the servers, but set them aside (details below) so i can upgrade and downgrade at will (details below) when we're ready for the upgrade.

      What's odd is that MMS thinks we're running 2.2.5 on 3 servers and 2.2.1 on 2 servers ... when in reality i executed the exact same commands on all five servers.

      Yesterday, I stopped mongod:
      $ /etc/init.d/mongod stop

      Yum upgraded to 2.2.5:
      $ yum update mongo-10gen-2.2.5 mongo-10gen-server-2.2.5

      But then mv'd all of the 2.2.5 binaries aside, e.g.:
      $ cd /usr/bin
      $ mv mongo mongo.2.2.5
      $ mv mongod mongod.2.2.5
      $ mv mongodump mongodump.2.2.5
      $ mv mongoexport mongoexport.2.2.5
      $ mv mongofiles mongofiles.2.2.5
      $ mv mongoimport mongoimport.2.2.5
      $ mv mongooplog mongooplog.2.2.5
      $ mv mongoperf mongoperf.2.2.5
      $ mv mongorestore mongorestore.2.2.5
      $ mv mongos mongos.2.2.5
      $ mv mongostat mongostat.2.2.5
      $ mv mongotop mongotop.2.2.5
      $ mv bsondump bsondump.2.2.5

      And sym linkd the 2.2.1 binaries (which is what we've been running on):
      $ ln -sf mongo.2.2.1 mongo
      $ ln -sf mongod.2.2.1 mongod
      $ ln -sf mongodump.2.2.1 mongodump
      $ ln -sf mongoexport.2.2.1 mongoexport
      $ ln -sf mongofiles.2.2.1 mongofiles
      $ ln -sf mongoimport.2.2.1 mongoimport
      $ ln -sf mongooplog.2.2.1 mongoimport
      $ ln -sf mongoperf.2.2.1 mongoperf
      $ ln -sf mongorestore.2.2.1 mongorestore
      $ ln -sf mongos.2.2.1 mongos
      $ ln -sf mongostat.2.2.1 mongostat
      $ ln -sf mongotop.2.2.1 mongotop
      $ ln -sf bsondump.2.2.1 bsondump

      Then started mongod back up:
      $ /etc/init.d/mongod start

      So my incredibly trivial question is: how does MMS get it's version info? I'm guessing it's not from the running daemon but possibly via a YUM post-install hook or some YUM meta-data somewhere.

      Thanks
      --tom

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