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I currently work for MongoDB, Inc. and have a background in operations, networking and system administration. You can find me in all the usual places, but probably the most useful and relevant are listed below:

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Aug
10
comment Mongodb replica failures to resolve DNS when primary DNS is stopped while secondary DNS is operational
Just to note, the question is misleading because that's not a crash - it's just a failure to resolve the address because it's not failing over to the secondary DNS - a crash would mean that the mongod completely shuts down which is not happening here (and would mean something very different)
Jul
10
comment MongoDB Max Connections
Can you comment on the version you are using - the treatment of max connections changed with 2.6
Jun
26
comment MongoDB copyDatabase failed with dbOwner
My bad - it even tells you that the data remains intact at the end of that page. Seems that is the issue, so need to figure out a way to get rid of that permanently (assuming no issues post-migration)
Jun
26
comment MongoDB copyDatabase failed with dbOwner
Did you do this when you upgraded? docs.mongodb.org/manual/release-notes/2.6-upgrade-authorization There is a process to upgrade the user auth data when you go to 2.6 - if you did this and the issue is still there, then it's probably a (reproducible) bug, but if not then that is likely the root cause here.
Jun
25
comment MongoDB copyDatabase failed with dbOwner
Try: { resource: { db: "db1", collection: "system.users" }, actions: [ "find" ] } and then add insert to the actions if it still fails.
Jun
25
comment MongoDB copyDatabase failed with dbOwner
Hmmm, since this is not an admin DB you shouldn't need access to system.users and dbOwner should be more than enough. That makes me wonder if the authentication is succeeding and granting you that role for the copyDatabase. It will take me a little while to get some testing set up. If you wanted to do a little differential diagnosis yourself in the meantime, you could try using the root role for that user temporarily and see if it still fails. If it does, then that would imply that the issue is getting authenticated as the user rather than the role the user has (root has all access)
Jun
25
comment ENTRYPOINT & CMD commands with mongod results in unknown option error
first thing to try would be to take out the port and dbpath parameters, after all that is what you get as defaults anyway. What happens if you make it just CMD ["--smallfiles"]?
Jun
25
answered MongoDB copyDatabase failed with dbOwner
Jun
23
comment mongod won't run without me specifying my own conf path
I don't think you quite got what I meant. When you run mongod with not arguments, it defaults to /data/db - that will error regardless of the user you are running with if that folder does not exist. Hence your issues when running it without an explicit dbpath or config. Your issue with the service starting, and then not working is separate, and that is where you are likely running afoul of the permissions issues. None of this is really a mongodb issue, you would have the same problems with any service's files if you run the service as root.
Jun
23
answered mongod won't run without me specifying my own conf path
Jun
11
answered Rename Mongo Shard
May
30
comment Mongodump on Gridfs is killing the host IOs
Not at the moment, unless you use a node specifically for that purpose - you could have a secondary and tag it as "backup", the others as "prod" for example and have the backup queries only hit that node. You could even run more than one process on the host, make one of the them your designated backup node and then ionice that process, but for a single existing process there is no way to target specific queries within that process from a system level (that I know of).
May
30
comment Mongodump on Gridfs is killing the host IOs
But, since all the requests are coming from the same binary (mongod) you can't use ionice - the mongodump uses a regular query just like anything else and that is then serviced by mongod, so it's not competing with another process. You can use mongodump to access files directly (and hence ionice would work on it) but you have to shut down the mongod to be able to do that anyway, so nothing gained.
May
30
answered Mongodump on Gridfs is killing the host IOs
May
25
answered Amazon OpsWorks - unable to reference ebs volume in mongo dbpath
May
11
answered How to start Mongo daemon with auth support
May
9
answered mongodb on aws 2 region replication
Apr
23
answered Installing multiple mongoDB versions on the same server
Apr
14
comment Backup MongoDB database copying files in `dbpath`?
Asked and answered already here: dba.stackexchange.com/a/62853/6441
Apr
8
comment how to integrate between MONGODB & SOLR, using MONGO-CONNECTOR
auth is failing (per the error) - if you run without auth I assume it will work, so it would seem that you are either passing in the wrong credentials or the user is not valid to run the command - you mentioned that you started the shell, but did you try running a command (like rs.status()) to verify the user was logged in and valid?