Configuration File Options
http://docs.mongodb.org/manual/reference/configuration-options/

#-- systemLog Options
systemLog:
   verbosity: <int:0>
   quiet: <boolean>
   traceAllException: <boolean>
   syslogFacility: <string:user>
   path: <string>
   logAppend: <boolean:False>
   logRotate: <string:rename>
   destination: <string>
   timeStampFormat: <string:iso8601-local>
   component:
      accessControl:
         verbosity: <int:0>
      command:
         verbosity: <int:0>
      control:
         verbosity: <int:0>
      geo:
         verbosity: <int:0>
      index:
         verbosity: <int:0>
      network:
         verbosity: <int:0>
      query:
         verbosity: <int:0>
      replication:
         verbosity: <int:0>
      sharding:
         verbosity: <int:0>
      storage:
         verbosity: <int:0>
         journal:
            verbosity: <int:0>
      write:
         verbosity: <int:0>

#-- processManagement Options
processManagement:
   fork: <boolean:False>
   pidFilePath: <string>

#-- net Options
net:
   port: <int:27017>
   bindIp: <string:All interface>
   maxIncomingConnections: <int:65536>
   wireObjectCheck: <boolean:True>
   ipv6: <boolean:False>
   unixDomainSocket:
      enabled: <boolean:True>
      pathPrefix: <string:/tmp>
      filePermissions: <int:0700>
   http:
      enabled: <boolean:False>
      JSONPEnabled: <boolean:False>
      RESTInterfaceEnabled: <boolean:False>
   ssl:
      sslOnNormalPorts: <boolean>  # deprecated since 2.6
      mode: <string>
      PEMKeyFile: <string>
      PEMKeyPassword: <string>
      clusterFile: <string>
      clusterPassword: <string>
      CAFile: <string>
      CRLFile: <string>
      allowConnectionsWithoutCertificates: <boolean>
      allowInvalidCertificates: <boolean>
      allowInvalidHostnames: <boolean:False>
      net.ssl.FIPSMode: <boolean>

#-- security Options
security:
   keyFile: <string>
   clusterAuthMode: <string:keyFile>
   authorization: <string:disabled>
   javascriptEnabled:  <boolean:True>
   sasl:
      hostName: <string>
      serviceName: <string>

#-- setParameter Option
setParameter:
   <parameter1>: <value1>
   <parameter2>: <value2>

#-- storage Options
storage:
   dbPath: <string>
   indexBuildRetry: <boolean:True>
   repairPath: <string:A _tmp directory within the path specified by the dbPath option>
   journal:
      enabled: <boolean:True on 64-bit systems, False on 32-bit systems>
   directoryPerDB: <boolean:False>
   syncPeriodSecs: <int:60>
   engine: <string:mmapv1>
   mmapv1:
      preallocDataFiles: <boolean:True>
      nsSize: <int:16>
      quota:
         enforced: <boolean:false>
         maxFilesPerDB: <int:8>
      smallFiles: <boolean:False>
      journal:
         debugFlags: <int>
         commitIntervalMs: <num:100 or 30>
   wiredTiger:
      engineConfig:
         cacheSizeGB: <number:the maximum of half of physical RAM or 1 gigabyte>
         statisticsLogDelaySecs: <number:0>
         journalCompressor: <string:snappy>
         directoryForIndexes: <boolean:false>
      collectionConfig:
         blockCompressor: <string:snappy>
      indexConfig:
         prefixCompression: <boolean:true>

#-- operationProfiling Options
operationProfiling:
   slowOpThresholdMs: <int:100>
   mode: <string:off>

#-- replication Options
replication:
   oplogSizeMB: <int>
   replSetName: <string>
   secondaryIndexPrefetch: <string:all>

#-- sharding Options
sharding:
   clusterRole: <string>
   archiveMovedChunks: <boolean:True>

#-- auditLog Options
auditLog:
   destination: <string>
   format: <string>
   path: <string>
   filter: <string>

#-- snmp Options
snmp:
   subagent: <boolean>
   master: <boolean>

#-- mongos-only Options
replication:
   localPingThresholdMs: <boolean:15>
sharding:
   autoSplit: <boolean:True>
   configDB: <string>
   chunkSize: <int:64>