[root@zk-datanode-02 mongodb]# bin/mongod -f config/mongo.cnf &
[1] 30549
[root@zk-datanode-02 mongodb]# 2017-06-09T07:13:09.423+0000 F CONTROL [main] Failed global initialization: BadValue: Invalid or no user locale set.

Please ensure LANG and/or LC_* environment variables are set correctly.

[1]+ Exit 1 bin/mongod -f config/mongo.cnf

解决方法：
vi /etc/profile
增加环境变量设置：export LC_ALL=C

重启mongodb即可

vi /etc/environment
增加 LANG=en_US.utf-8

启动mongodb报错问题