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ERROR: Child process failed, exited with error number 51 MongoDB

Getting this error when restarting MongoDB, I am using Mongo 3.2.4 and doing this on a new machine

Starting mongod... about to fork child process, waiting until server is ready for connections.
forked process: 19438
ERROR: child process failed, exited with error number 51
 mongod(_ZN5mongo19MmapV1ExtentManager4initEPNS_16OperationContextE+0x4A8) [0x1040278]
 mongod(_ZN5mongo26MMAPV1DatabaseCatalogEntryC1EPNS_16OperationContextENS_10StringDataES3_bb+0x187) [0x1036dc7]
 mongod(_ZN5mongo12MMAPV1Engine23getDatabaseCatalogEntryEPNS_16OperationContextENS_10StringDataE+0x14E) [0x103a1de]
 mongod(_ZN5mongo14DatabaseHolder6openDbEPNS_16OperationContextENS_10StringDataEPb+0x133) [0xac92a3]

-----  END BACKTRACE  -----
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2 answers


This is resolved by entering the following lines in /etc/security/limits.conf

:

mongodb      soft    nofile          65535
mongodb      hard    nofile          90000
mongodb      soft    nproc           65535
mongodb      hard    nproc           90000


We need to add the user account used to start the Mongo service. This is usually the user mongodb

.

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For me, this error came from wrong ownership of some files in my data directory. I fixed this using the following command:

sudo chown -R mongodb: /path/to/db/directory


Where mongodb was the database user in my case.

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