1.下载安装好mongoDB之后 我们要在终端开启mongo的服务 命令如下：
mongod
*mongod 为开启mongo的服务
错误1:
1.执行之后报错
2017-11-30T15:50:26.673+0800 I CONTROL [initandlisten] MongoDB starting : pid=39872 port=27017 dbpath=/data/db 64-bit host=localhost
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] db version v3.4.10
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] git version: 078f28920cb24de0dd479b5ea6c66c644f6326e9
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.2m 2 Nov 2017
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] allocator: system
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] modules: none
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] build environment:
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] distarch: x86_64
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] target_arch: x86_64
2017-11-30T15:50:26.675+0800 I CONTROL [initandlisten] options: {}
2017-11-30T15:50:26.677+0800 I STORAGE [initandlisten] exception in initAndListen: 20 Attempted to create a lock file on a read-only directory: /data/db, terminating
2017-11-30T15:50:26.677+0800 I NETWORK [initandlisten] shutdown: going to close listening sockets...
2017-11-30T15:50:26.677+0800 I NETWORK [initandlisten] shutdown: going to flush diaglog...
2017-11-30T15:50:26.678+0800 I CONTROL [initandlisten] now exiting
2017-11-30T15:50:26.678+0800 I CONTROL [initandlisten] shutting down with code:100
可以看里面有个提示信息：
2017-11-30T15:50:26.677+0800 I STORAGE [initandlisten] exception in initAndListen: 20 Attempted to create a lock file on a read-only directory: /data/db, terminating
这是缺失/db文件目录 解决方法在终端输入如下命令创建目录：
sudo mkdir -p /data/db
错误2:
然后继续执行gongod命令 发现报错如下：
localhost:~ mengwang$ mongod
2017-11-30T15:50:26.673+0800 I CONTROL [initandlisten] MongoDB starting : pid=39872 port=27017 dbpath=/data/db 64-bit host=localhost
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] db version v3.4.10
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] git version: 078f28920cb24de0dd479b5ea6c66c644f6326e9
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] OpenSSL version: OpenSSL 1.0.2m 2 Nov 2017
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] allocator: system
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] modules: none
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] build environment:
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] distarch: x86_64
2017-11-30T15:50:26.674+0800 I CONTROL [initandlisten] target_arch: x86_64
2017-11-30T15:50:26.675+0800 I CONTROL [initandlisten] options: {}
2017-11-30T15:50:26.677+0800 I STORAGE [initandlisten] exception in initAndListen: 20 Attempted to create a lock file on a read-only directory: /data/db, terminating
2017-11-30T15:50:26.677+0800 I NETWORK [initandlisten] shutdown: going to close listening sockets...
2017-11-30T15:50:26.677+0800 I NETWORK [initandlisten] shutdown: going to flush diaglog...
2017-11-30T15:50:26.678+0800 I CONTROL [initandlisten] now exiting
2017-11-30T15:50:26.678+0800 I CONTROL [initandlisten] shutting down with code:100
可以看里面有个提示信息：
2017-11-30T15:50:26.677+0800 I STORAGE [initandlisten] exception in initAndListen: 20 Attempted to create a lock file on a read-only directory: /data/db, terminating
这是由于刚刚创建的目录没有读写权限，输入命令设置读写权限：
sudo chmod -R go+w /data/db
然后在执行mongod命令 服务就启动成功了。
可以在浏览器输入http://localhost:27017测试一下 会在网页输出
It looks like you are trying to access MongoDB over HTTP on the native driver port
安装MongoDB可以参考：http://www.jianshu.com/p/2d0a1ecd0c82
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