最近，使用mongoDB数据库时，偶然使用了root启停数据库，导致后来mongo用户无法启动数据库，报权限拒绝，但是root可以正常启停mongoDB数据库。
使用ROOT启动数据库
[root@mongo data]# mongod --dbpath=$MONGO_DATA --logpath=$MONGO_LOGS/mongodb.log --logappend&
[1] 3526
查看mongoDB进程状态
[root@mongo data]# ps -ef|grep mongo
root 3526 46565 17 18:32 pts/2 00:00:01 mongod --dbpath=/opt/mongo/data --logpath=/opt/mongo/logs/mongodb.log --logappend
root 3546 46565 0 18:32 pts/2 00:00:00 grep mongo
root 46639 46622 0 Jun26 pts/5 00:00:00 su - mongo
mongo 46640 46639 0 Jun26 pts/5 00:00:00 –bash
操作mongoDB数据库
[root@mongo data]# mongo
MongoDB shell version: 3.2.7
connecting to: test
Server has startup warnings:
2016-06-27T18:32:12.881-0700 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2016-06-27T18:32:12.881-0700 I CONTROL [initandlisten]
> use zhul
switched to db zhul
> db.zhul.insert({"username":"test","id":123456});
WriteResult({ "nInserted" : 1 })
> db.zhul.findOne({"username":"test"});
{
"_id" : ObjectId("5771d3d3a3eb04b5a2150f87"),
"username" : "test",
"id" : 123456
}
> exit
bye
[root@mongo data]#
ROOT用户关闭mongoDB数据库
[root@mongo data]# mongo
MongoDB shell version: 3.2.7
connecting to: test
Server has startup warnings:
2016-06-27T18:32:12.881-0700 I CONTROL [initandlisten] ** WARNING: You are running this process as the root user, which is not recommended.
2016-06-27T18:32:12.881-0700 I CONTROL [initandlisten]
> use admin
switched to db admin
> db.shutdownServer();
server should be down...
2016-06-27T18:40:31.458-0700 I NETWORK [thread1] trying reconnect to 127.0.0.1:27017 (127.0.0.1) failed
2016-06-27T18:40:31.459-0700 W NETWORK [thread1] Failed to connect to 127.0.0.1:27017, reason: errno:111 Connection refused
2016-06-27T18:40:31.459-0700 I NETWORK [thread1] reconnect 127.0.0.1:27017 (127.0.0.1) failed failed
>
切换至mongo用户启动数据库，发现启动后，进程立即退出
[mongo@mongo logs]$ mongod --dbpath=$MONGO_DATA --logpath=/opt/mongo/logs/mongodb.log --logappend&
[1] 3725
[mongo@mongo logs]$
[1]+ Exit 100 mongod --dbpath=$MONGO_DATA --logpath=/opt/mongo/logs/mongodb.log --logappend
[mongo@mongo logs]$
查看mogodb.log，提示权限拒绝
2016-06-27T18:41:32.979-0700 I CONTROL [initandlisten] distarch: x86_64
2016-06-27T18:41:32.979-0700 I CONTROL [initandlisten] target_arch: x86_64
2016-06-27T18:41:32.979-0700 I CONTROL [initandlisten] options: { storage: { dbPath: "/opt/mongo/data" }, systemLog: { destination: "file", logAppend: true, path: "/opt/mongo/logs/mongodb.log" } }
2016-06-27T18:41:32.999-0700 I - [initandlisten] Detected data files in /opt/mongo/data created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2016-06-27T18:41:32.999-0700 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=1G,session_max=20000,eviction=(threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),
2016-06-27T18:41:33.024-0700 E STORAGE [initandlisten] WiredTiger (13) [1467078093:24444][3725:0x7fe458275c80], txn-recover: /opt/mongo/data/journal/WiredTigerLog.0000000021: handle-open: open: Permission denied
2016-06-27T18:41:33.024-0700 E STORAGE [initandlisten] WiredTiger (13) [1467078093:24486][3725:0x7fe458275c80], txn-recover: Recovery failed: Permission denied
2016-06-27T18:41:33.033-0700 I - [initandlisten] Assertion: 28595:13: Permission denied
2016-06-27T18:41:33.033-0700 I STORAGE [initandlisten] exception in initAndListen: 28595 13: Permission denied, terminating
2016-06-27T18:41:33.033-0700 I CONTROL [initandlisten] dbexit: rc: 100
网上有人说，启动数据库，需要恢复时会在tmp目录下生成一个mongodb-27017.sock文件，删除重新启动即可，但是事实证明不是这个文件导致的。
Tmp目录下确实生成了.sock文件
[root@mongo tmp]# ls -l mongodb-27017.sock
srwx------. 1 mongo mongo 0 Jun 27 18:41 mongodb-27017.sock
[root@mongo tmp]#
ROOT删除之
[root@mongo tmp]# rm -rf mongodb-27017.sock
[root@mongo tmp]#
再次使用mongo用户启动mongoDB，发现问题依旧
[mongo@mongo logs]$ mongod --dbpath=$MONGO_DATA --logpath=/opt/mongo/logs/mongodb.log --logappend&
[1] 3835
[mongo@mongo logs]$
[1]+ Exit 100 mongod --dbpath=$MONGO_DATA --logpath=/opt/mongo/logs/mongodb.log --logappend
[mongo@mongo logs]$
根据日志报错提示WiredTiger权限拒绝，是不是有关wiredtiger文件权限问题，查看/opt/mongo/data、/opt/mongo/data/ journal文件下文件，发现确实有文件权限被改成了root:
[root@mongo data]# ls -l Wired*
-rw-rw-r--. 1 mongo mongo 46 Jun 11 01:31 WiredTiger
-rw-r--r--. 1 root root 4096 Jun 27 18:40 WiredTigerLAS.wt
-rw-rw-r--. 1 mongo mongo 21 Jun 11 01:31 WiredTiger.lock
-rw-r--r--. 1 root root 927 Jun 27 18:40 WiredTiger.turtle
-rw-rw-r--. 1 mongo mongo 94208 Jun 27 18:48 WiredTiger.wt
修改权限：
[root@mongo data]# chown mongo:mongo WiredTigerLAS.wt
[root@mongo data]# chown mongo:mongo WiredTiger.turtle
[root@mongo data]# chmod 664 WiredTigerLAS.wt
[root@mongo data]# chmod 664 WiredTiger.turtle
[root@mongo data]# ls -l Wired*
-rw-rw-r--. 1 mongo mongo 46 Jun 11 01:31 WiredTiger
-rw-rw-r--. 1 mongo mongo 4096 Jun 27 18:40 WiredTigerLAS.wt
-rw-rw-r--. 1 mongo mongo 21 Jun 11 01:31 WiredTiger.lock
-rw-rw-r--. 1 mongo mongo 927 Jun 27 18:40 WiredTiger.turtle
-rw-rw-r--. 1 mongo mongo 94208 Jun 27 18:54 WiredTiger.wt
[root@mongo journal]# ls -l
total 409624
-rw-r--r--. 1 root root 6912 Jun 27 18:40 WiredTigerLog.0000000021
-rw-rw-r--. 1 mongo mongo 104857728 Jun 27 18:41 WiredTigerLog.0000000022
-rw-rw-r--. 1 mongo mongo 104857728 Jun 27 18:48 WiredTigerLog.0000000023
-rw-rw-r--. 1 mongo mongo 104857728 Jun 27 18:54 WiredTigerLog.0000000024
-rw-rw-r--. 1 mongo mongo 104857728 Jun 27 18:55 WiredTigerLog.0000000025
[root@mongo journal]# chown mongo:mongo WiredTigerLog.0000000021
[root@mongo journal]# chmod 664 WiredTigerLog.0000000021
[root@mongo journal]# ls -l
total 409624
-rw-rw-r--. 1 mongo mongo 6912 Jun 27 18:40 WiredTigerLog.0000000021
-rw-rw-r--. 1 mongo mongo 104857728 Jun 27 18:41 WiredTigerLog.0000000022
-rw-rw-r--. 1 mongo mongo 104857728 Jun 27 18:48 WiredTigerLog.0000000023
-rw-rw-r--. 1 mongo mongo 104857728 Jun 27 18:54 WiredTigerLog.0000000024
-rw-rw-r--. 1 mongo mongo 104857728 Jun 27 18:55 WiredTigerLog.0000000025
[root@mongo journal]#
再次使用mongo用户启动数据库，成功！
[mongo@mongo logs]$ mongod --dbpath=$MONGO_DATA --logpath=/opt/mongo/logs/mongodb.log --logappend&
[1] 4073
[mongo@mongo logs]$
[mongo@mongo logs]$
[mongo@mongo logs]$
[mongo@mongo logs]$
[mongo@mongo logs]$
[mongo@mongo logs]$ tail -20 mongodb.log
2016-06-27T18:59:51.233-0700 I CONTROL [main] ***** SERVER RESTARTED *****
2016-06-27T18:59:51.241-0700 I CONTROL [initandlisten] MongoDB starting : pid=4073 port=27017 dbpath=/opt/mongo/data 64-bit host=mongo
2016-06-27T18:59:51.241-0700 I CONTROL [initandlisten] db version v3.2.7
2016-06-27T18:59:51.241-0700 I CONTROL [initandlisten] git version: 4249c1d2b5999ebbf1fdf3bc0e0e3b3ff5c0aaf2
2016-06-27T18:59:51.241-0700 I CONTROL [initandlisten] allocator: tcmalloc
2016-06-27T18:59:51.241-0700 I CONTROL [initandlisten] modules: none
2016-06-27T18:59:51.241-0700 I CONTROL [initandlisten] build environment:
2016-06-27T18:59:51.241-0700 I CONTROL [initandlisten] distarch: x86_64
2016-06-27T18:59:51.241-0700 I CONTROL [initandlisten] target_arch: x86_64
2016-06-27T18:59:51.241-0700 I CONTROL [initandlisten] options: { storage: { dbPath: "/opt/mongo/data" }, systemLog: { destination: "file", logAppend: true, path: "/opt/mongo/logs/mongodb.log" } }
2016-06-27T18:59:51.260-0700 I - [initandlisten] Detected data files in /opt/mongo/data created by the 'wiredTiger' storage engine, so setting the active storage engine to 'wiredTiger'.
2016-06-27T18:59:51.261-0700 I STORAGE [initandlisten] wiredtiger_open config: create,cache_size=1G,session_max=20000,eviction=(threads_max=4),config_base=false,statistics=(fast),log=(enabled=true,archive=true,path=journal,compressor=snappy),file_manager=(close_idle_time=100000),checkpoint=(wait=60,log_size=2GB),statistics_log=(wait=0),
2016-06-27T18:59:53.198-0700 I FTDC [initandlisten] Initializing full-time diagnostic data capture with directory '/opt/mongo/data/diagnostic.data'
2016-06-27T18:59:53.199-0700 I NETWORK [initandlisten] waiting for connections on port 27017
2016-06-27T18:59:53.199-0700 I NETWORK [HostnameCanonicalizationWorker] Starting hostname canonicalization worker
[mongo@mongo logs]$ ps -ef|grep mongo
mongo 4073 46640 6 18:59 pts/5 00:00:02 mongod --dbpath=/opt/mongo/data --logpath=/opt/mongo/logs/mongodb.log --logappend
mongo 4105 46640 0 19:00 pts/5 00:00:00 ps -ef
mongo 4106 46640 0 19:00 pts/5 00:00:00 grep mongo
root 46639 46622 0 Jun26 pts/5 00:00:00 su - mongo
mongo 46640 46639 0 Jun26 pts/5 00:00:00 -bash
[mongo@mongo logs]$ mongo
MongoDB shell version: 3.2.7
connecting to: test
>
问题成功解决！
