ターミナルに次のエラーが表示されます。
$ mongo
MongoDB shell version: 2.4.5
connecting to: test
Wed Jul 24 14:26:45.779 JavaScript execution failed: Error: couldn't connect to server 127.0.0.1:27017 at src/mongo/shell/mongo.js:L112
exception: connect failed
mongod run --config /usr/local/etc/mongod.conf の実行時に
コンソールに次のエラーが表示されます。
about to fork child process, waiting until server is ready for connections.
forked process: 11204
all output going to: /usr/local/var/log/mongodb/mongo.log
ERROR: child process failed, exited with error number 100
mongo.log には次のように表示されます。
***** SERVER RESTARTED *****
Wed Jul 24 14:39:57.360 [initandlisten] MongoDB starting : pid=11204 port=27017 dbpath=/usr/local/var/mongodb 64-bit host=59.161.67.13.del-cdma.dialup.vsnl.net.in
Wed Jul 24 14:39:57.363 [initandlisten]
Wed Jul 24 14:39:57.363 [initandlisten] ** WARNING: soft rlimits too low. Number of files is 256, should be at least 1000
Wed Jul 24 14:39:57.363 [initandlisten] db version v2.4.5
Wed Jul 24 14:39:57.363 [initandlisten] git version: a2ddc68ba7c9cee17bfe69ed840383ec3506602b
Wed Jul 24 14:39:57.363 [initandlisten] build info: Darwin bs-osx-106-x86-64-2.10gen.cc 10.8.0 Darwin Kernel Version 10.8.0: Tue Jun 7 16:32:41 PDT 2011; root:xnu-1504.15.3~1/RELEASE_X86_64 x86_64 BOOST_LIB_VERSION=1_49
Wed Jul 24 14:39:57.363 [initandlisten] allocator: system
Wed Jul 24 14:39:57.363 [initandlisten] options: { bind_ip: "127.0.0.1", command: [ "run" ], config: "/usr/local/etc/mongod.conf", dbpath: "/usr/local/var/mongodb", fork: "true", journal: "true", logappend: "true", logpath: "/usr/local/var/log/mongodb/mongo.log", port: 27017, quiet: "true" }
Wed Jul 24 14:39:57.367 [initandlisten] journal dir=/usr/local/var/mongodb/journal
Wed Jul 24 14:39:57.368 [initandlisten] recover : no journal files present, no recovery needed
Wed Jul 24 14:39:58.113 [initandlisten] couldn't open /usr/local/var/mongodb/test.0 errno:13 Permission denied
Wed Jul 24 14:39:58.136 [initandlisten] couldn't open /usr/local/var/mongodb/test.0 errno:13 Permission denied
Wed Jul 24 14:39:58.152 [initandlisten] exception in initAndListen: 10085 can't map file memory, terminating
Wed Jul 24 14:39:58.152 dbexit:
Wed Jul 24 14:39:58.152 [initandlisten] shutdown: going to close listening sockets...
Wed Jul 24 14:39:58.153 [initandlisten] shutdown: going to flush diaglog...
Wed Jul 24 14:39:58.153 [initandlisten] shutdown: going to close sockets...
Wed Jul 24 14:39:58.153 [initandlisten] shutdown: waiting for fs preallocator...
Wed Jul 24 14:39:58.153 [initandlisten] shutdown: lock for final commit...
Wed Jul 24 14:39:58.153 [initandlisten] shutdown: final commit...
Wed Jul 24 14:39:58.153 [initandlisten] shutdown: closing all files...
Wed Jul 24 14:39:58.154 [initandlisten] closeAllFiles() finished
Wed Jul 24 14:39:58.154 [initandlisten] journalCleanup...
Wed Jul 24 14:39:58.154 [initandlisten] removeJournalFiles
Wed Jul 24 14:39:58.154 [initandlisten] shutdown: removing fs lock...
Wed Jul 24 14:39:58.154 dbexit: really exiting now
編集！（回答からの提案を試みます） $ mongod --repair を実行すると、次のエラーが発生します。
$ mongod --repair
Wed Jul 24 15:16:51.596 Can't specify both --journal and --repair options.