1、vim mongo.conf
里面写如下内容：
dbpath=/usr/local/mongodb/data/
logpath=/usr/local/mongodb/logs/mongodb.log
logappend=true
port=27017
fork=true
2、启动mongod
/usr/local/mongodb/bin/mongod -f /usr/local/mongodb/mongo.conf
报错：
about to fork child process, waiting until server is ready for connections.
forked process: 2340
ERROR: child process failed, exited with error number 1
3、解决办法：
1、删除mongo.lock文件
2、/usr/local/bin/mongod --repair --dbpath=/usr/local/data
完成修复后就可以启动mongodb的客户端了！
4、启动客户端：
/usr/local/mongodb/bin/mongo
出现：
MongoDB shell version v3.4.1
connecting to: mongodb://127.0.0.1:27017
MongoDB server version: 3.4.1
就ok啦！
