centos中mongodb已启动，但是本地mongo命令无效 ###启动命令

[root[@localhost](/user/localhost) bin]# /down/mongodb/bin/mongod --bind_ip localhost -f /down/mongodb/bin/mongodb.conf
about to fork child process, waiting until server is ready for connections.
forked process: 2529
child process started successfully, parent exiting
[root[@localhost](/user/localhost) bin]# ./mongod --config mongodb.conf
about to fork child process, waiting until server is ready for connections.
forked process: 2542
ERROR: child process failed, exited with error number 100
[root[@localhost](/user/localhost) bin]# ./mongod --config mongodb.conf
about to fork child process, waiting until server is ready for connections.
forked process: 2573
child process started successfully, parent exiting

###服务进程

PID/Program name    
tcp        0      0 127.0.0.1:25            0.0.0.0:*               LISTEN      
2186/master         
tcp        0      0 0.0.0.0:27017           0.0.0.0:*               LISTEN      
3081/./mongod       
tcp        0      0 0.0.0.0:22              0.0.0.0:*               LISTEN      
3577/sshd           

###日志文件

2014-07-18T02:33:01.040+0800 [initandlisten] MongoDB starting : pid=3081 port=27017 dbpath=/usr/local/mongodb/data/db 64-bit host=localhost.localdomain
2014-07-18T02:33:01.040+0800 [initandlisten] db version v2.6.3
2014-07-18T02:33:01.040+0800 [initandlisten] git version: 255f67a66f9603c59380b2a389e386910bbb52cb
2014-07-18T02:33:01.040+0800 [initandlisten] build info: Linux build12.nj1.10gen.cc 2.6.32-431.3.1.el6.x86_64 #1 SMP Fri Jan 3 21:39:27 UTC 2014 x86_64 BOOST_LIB_VERSION=1_49
2014-07-18T02:33:01.040+0800 [initandlisten] allocator: tcmalloc
2014-07-18T02:33:01.040+0800 [initandlisten] options: { config: "mongodb.conf", net: { http: { enabled: false }, port: 27017 }, processManagement: { fork: true }, storage: { dbPath: "/usr/local/mongodb/data/db", journal: { enabled: true } }, systemLog: { destination: "file", path: "/usr/local/mongodb/logs/mongodb.log" } }
2014-07-18T02:33:01.040+0800 [initandlisten] 
2014-07-18T02:33:01.040+0800 [initandlisten] ** WARNING: Readahead for /usr/local/mongodb/data/db is set to 4096KB
2014-07-18T02:33:01.040+0800 [initandlisten] **          We suggest setting it to 256KB (512 sectors) or less
2014-07-18T02:33:01.040+0800 [initandlisten] **          http://dochub.mongodb.org/core/readahead
2014-07-18T02:33:01.042+0800 [initandlisten] journal dir=/usr/local/mongodb/data/db/journal
2014-07-18T02:33:01.042+0800 [initandlisten] recover begin
2014-07-18T02:33:01.042+0800 [initandlisten] info no lsn file in journal/ directory
2014-07-18T02:33:01.042+0800 [initandlisten] recover lsn: 0
2014-07-18T02:33:01.042+0800 [initandlisten] recover /usr/local/mongodb/data/db/journal/j._0
2014-07-18T02:33:01.044+0800 [initandlisten] recover cleaning up
2014-07-18T02:33:01.044+0800 [initandlisten] removeJournalFiles
2014-07-18T02:33:01.044+0800 [initandlisten] recover done
2014-07-18T02:33:01.097+0800 [initandlisten] waiting for connections on port 27017
2014-07-18T02:34:01.104+0800 [clientcursormon] mem (MB) res:31 virt:442
2014-07-18T02:34:01.104+0800 [clientcursormon]  mapped (incl journal view):160
2014-07-18T02:34:01.104+0800 [clientcursormon]  connections:0
2014-07-18T02:39:01.149+0800 [clientcursormon] mem (MB) res:31 virt:442
2014-07-18T02:39:01.149+0800 [clientcursormon]  mapped (incl journal view):160
2014-07-18T02:39:01.149+0800 [clientcursormon]  connections:0
2014-07-18T02:44:01.187+0800 [clientcursormon] mem (MB) res:31 virt:442
2014-07-18T02:44:01.187+0800 [clientcursormon]  mapped (incl journal view):160
2014-07-18T02:44:01.187+0800 [clientcursormon]  connections:0
2014-07-18T02:49:01.227+0800 [clientcursormon] mem (MB) res:31 virt:442
2014-07-18T02:49:01.227+0800 [clientcursormon]  mapped (incl journal view):160
2014-07-18T02:49:01.227+0800 [clientcursormon]  connections:0
2014-07-18T02:54:01.296+0800 [clientcursormon] mem (MB) res:31 virt:442
2014-07-18T02:54:01.296+0800 [clientcursormon]  mapped (incl journal view):160
2014-07-18T02:54:01.296+0800 [clientcursormon]  connections:0
2014-07-18T02:59:01.335+0800 [clientcursormon] mem (MB) res:31 virt:442
2014-07-18T02:59:01.335+0800 [clientcursormon]  mapped (incl journal view):160
2014-07-18T02:59:01.335+0800 [clientcursormon]  connections:0
2014-07-18T03:04:01.377+0800 [clientcursormon] mem (MB) res:31 virt:442
2014-07-18T03:04:01.378+0800 [clientcursormon]  mapped (incl journal view):160
2014-07-18T03:04:01.378+0800 [clientcursormon]  connections:0
2014-07-18T03:09:01.419+0800 [clientcursormon] mem (MB) res:31 virt:442
2014-07-18T03:09:01.419+0800 [clientcursormon]  mapped (incl journal view):160
2014-07-18T03:09:01.419+0800 [clientcursormon]  connections:0
2014-07-18T03:09:49.378+0800 [initandlisten] connection accepted from 127.0.0.1:45122 #1 (1 connection now open)
2014-07-18T03:09:49.379+0800 [initandlisten] connection accepted from 127.0.0.1:45123 #2 (2 connections now open)
2014-07-18T03:09:49.380+0800 [initandlisten] connection accepted from 127.0.0.1:45124 #3 (3 connections now open)
2014-07-18T03:09:49.380+0800 [initandlisten] connection accepted from 127.0.0.1:45125 #4 (4 connections now open)
2014-07-18T03:09:49.382+0800 [initandlisten] connection accepted from 127.0.0.1:45126 #5 (5 connections now open)
2014-07-18T03:09:49.394+0800 [FileAllocator] allocating new datafile /usr/local/mongodb/data/db/biizhi.ns, filling with zeroes...
2014-07-18T03:09:49.394+0800 [FileAllocator] creating directory /usr/local/mongodb/data/db/_tmp
2014-07-18T03:09:49.396+0800 [FileAllocator] done allocating datafile /usr/local/mongodb/data/db/biizhi.ns, size: 16MB,  took 0 secs
2014-07-18T03:09:49.399+0800 [FileAllocator] allocating new datafile /usr/local/mongodb/data/db/biizhi.0, filling with zeroes...
2014-07-18T03:09:49.400+0800 [FileAllocator] done allocating datafile /usr/local/mongodb/data/db/biizhi.0, size: 64MB,  took 0 secs
2014-07-18T03:09:49.402+0800 [conn1] build index on: biizhi.users properties: { v: 1, key: { _id: 1 }, name: "_id_", ns: "biizhi.users" }
2014-07-18T03:09:49.402+0800 [conn1]     added index to empty collection
2014-07-18T03:09:49.404+0800 [conn1] build index on: biizhi.users properties: { v: 1, unique: true, key: { email: 1 }, name: "email_1", ns: "biizhi.users", safe: true }
2014-07-18T03:09:49.404+0800 [conn1]     added index to empty collection
2014-07-18T03:09:49.405+0800 [conn2] build index on: biizhi.users properties: { v: 1, unique: true, key: { name: 1 }, name: "name_1", ns: "biizhi.users", safe: true }
2014-07-18T03:09:49.405+0800 [conn2]     added index to empty collection
2014-07-18T03:09:49.406+0800 [conn5] build index on: biizhi.mcontact properties: { v: 1, key: { _id: 1 }, name: "_id_", ns: "biizhi.mcontact" }
2014-07-18T03:09:49.406+0800 [conn5]     added index to empty collection
2014-07-18T03:09:49.406+0800 [conn5] build index on: biizhi.mcontact properties: { v: 1, unique: true, key: { mcemail: 1 }, name: "mcemail_1", ns: "biizhi.mcontact", safe: true }
2014-07-18T03:09:49.406+0800 [conn5]     added index to empty collection
2014-07-18T03:10:01.427+0800 [clientcursormon] mem (MB) res:31 virt:607
2014-07-18T03:10:01.427+0800 [clientcursormon]  mapped (incl journal view):320
2014-07-18T03:10:01.427+0800 [clientcursormon]  connections:5
2014-07-18T03:10:05.470+0800 [initandlisten] connection accepted from 127.0.0.1:45132 #6 (6 connections now open)
2014-07-18T03:10:05.474+0800 [initandlisten] connection accepted from 127.0.0.1:45133 #7 (7 connections now open)
2014-07-18T03:10:05.474+0800 [initandlisten] connection accepted from 127.0.0.1:45134 #8 (8 connections now open)
2014-07-18T03:10:05.474+0800 [initandlisten] connection accepted from 127.0.0.1:45135 #9 (9 connections now open)
2014-07-18T03:10:05.474+0800 [initandlisten] connection accepted from 127.0.0.1:45136 #10 (10 connections now open)
2014-07-18T03:10:05.487+0800 [conn8] build index on: biizhi.sessions properties: { v: 1, key: { _id: 1 }, name: "_id_", ns: "biizhi.sessions" }
2014-07-18T03:10:05.487+0800 [conn8]     added index to empty collection
2014-07-18T03:10:05.487+0800 [conn8] build index on: biizhi.sessions properties: { v: 1, key: { expires: 1 }, name: "expires_1", ns: "biizhi.sessions", expireAfterSeconds: 0 }
2014-07-18T03:10:05.487+0800 [conn8]     added index to empty collection
2014-07-18T03:14:01.474+0800 [clientcursormon] mem (MB) res:39 virt:1177
2014-07-18T03:14:01.474+0800 [clientcursormon]  mapped (incl journal view):320
2014-07-18T03:14:01.474+0800 [clientcursormon]  connections:10
2014-07-18T03:19:01.519+0800 [clientcursormon] mem (MB) res:39 virt:1177
2014-07-18T03:19:01.520+0800 [clientcursormon]  mapped (incl journal view):320
2014-07-18T03:19:01.520+0800 [clientcursormon]  connections:10
2014-07-18T03:24:01.580+0800 [clientcursormon] mem (MB) res:42 virt:1177
2014-07-18T03:24:01.580+0800 [clientcursormon]  mapped (incl journal view):320
2014-07-18T03:24:01.580+0800 [clientcursormon]  connections:10
2014-07-18T03:29:01.638+0800 [clientcursormon] mem (MB) res:42 virt:1177
2014-07-18T03:29:01.639+0800 [clientcursormon]  mapped (incl journal view):320
2014-07-18T03:29:01.639+0800 [clientcursormon]  connections:10
2014-07-18T11:27:32.902+0800 [clientcursormon] mem (MB) res:42 virt:1177
2014-07-18T11:27:32.902+0800 [clientcursormon]  mapped (incl journal view):320
2014-07-18T11:27:32.902+0800 [clientcursormon]  connections:10
2014-07-18T11:32:32.976+0800 [clientcursormon] mem (MB) res:42 virt:1177
2014-07-18T11:32:32.976+0800 [clientcursormon]  mapped (incl journal view):320
2014-07-18T11:32:32.976+0800 [clientcursormon]  connections:10
2014-07-18T11:37:33.046+0800 [clientcursormon] mem (MB) res:42 virt:1177
2014-07-18T11:37:33.046+0800 [clientcursormon]  mapped (incl journal view):320
2014-07-18T11:37:33.046+0800 [clientcursormon]  connections:10

这是什么情况，忘大神指导