StackOverflow上面的答案，對我最有用的一個。

I was struggling with this issue, and realized that if you list you list your destination folder with ls -lahZ it will give you the security context, the context for the mongo data folder should be set like: "sudo chcon -R -u system_u -t mongod_var_lib_t /folder/data" this besides the
 
 obvious permissions and user:group combination. Hope it helps. – jmdiego Feb 18 '15 at 7:17 

具體操作步驟如下。

ls -lahZ /data/db

[root@db opt]# ls -lahZ /srv/mongodb/
drwxr-xr-x. mongod mongod system_u:object_r:unlabeled_t:s0 .
drwxr-xr-x. root   root   system_u:object_r:var_t:s0       ..
drwxr-xr-x. mongod mongod unconfined_u:object_r:unlabeled_t:s0 log
 

-rw-r--r--. mongod mongod unconfined_u:object_r:unlabeled_t:s0 mongod.lock

檢視mongo預設的資料儲存路徑屬性。

[[email protected] opt]# ls -lahZ /var/lib/mongo/
drwxr-xr-x. mongod mongod system_u:object_r:mongod_var_lib_t:s0 .
drwxr-xr-x. root   root   system_u:object_r:var_lib_t:s0   ..
-rw-------. mongod mongod system_u:
 
object_r:mongod_var_lib_t:s0 admin.0
-rw-------. mongod mongod system_u:object_r:mongod_var_lib_t:s0 admin.ns
drwxr-xr-x. root   root   unconfined_u:object_r:mongod_var_lib_t:s0 back
drwxr-xr-x. mongod mongod system_u:object_r:mongod_var_lib_t:s0 journal
-rw-------. mongod mongod system_u:object_r:mongod_var_lib_t:s0 local.0
-rw-------. mongod mongod system_u:object_r:mongod_var_lib_t:s0 local.ns
-rw-r--r--. mongod mongod system_u:object_r:mongod_var_lib_t:s0 storage.bson
drwxr-xr-x. mongod mongod system_u:object_r:mongod_var_lib_t:s0 _tmp

修改目標目錄。

[root@db opt]# chcon -R -u system_u -t mongod_var_lib_t /data/db/

啟動mongodb。

[root@db opt]# service mongod start
Starting mongod (via systemctl):  
[  確定  ]