说明：
本文章出现的问题，是使用yum安装的mongodb，此种方式安装的mongodb，默认绑定在127.0.0.1 ip上，所以导致远程连接不上。
系统版本：
$ lsb_release -a
No LSB modules are available.
Distributor ID: Ubuntu
Description: Ubuntu 16.04.2 LTS
Release: 16.04
Codename: xenial
mongodb版本：
> db.version()
2.6.10
ps：使用yum安装的mongodb
1、查看网络端口情况，发现mongodb服务没有绑定本地ip上
netstat -tunlp
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.1.1:53 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN -
tcp 0 0 127.0.0.1:27017 0.0.0.0:* LISTEN -
tcp6 0 0 :::22 :::* LISTEN -
udp 0 0 0.0.0.0:60855 0.0.0.0:* -
udp 0 0 127.0.1.1:53 0.0.0.0:* -
udp 0 0 0.0.0.0:68 0.0.0.0:* -
udp 0 0 0.0.0.0:631 0.0.0.0:* -
udp 0 0 0.0.0.0:5353 0.0.0.0:* -
udp6 0 0 :::44164 :::* -
udp6 0 0 :::5353 :::* -
2、修改/etc/mongodb.con文件中mongodb绑定端口的ip，绑定到本机网卡任何ip上：
bind_ip = 0.0.0.0
3、查看系统网络端口情况，mongodb服务监听的端口绑定中所有ip上，这样能够被内网的主机能够访问到
netstat -tunlp
(Not all processes could be identified, non-owned process info
will not be shown, you would have to be root to see it all.)
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 127.0.1.1:53 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN -
tcp 0 0 0.0.0.0:27017 0.0.0.0:* LISTEN -
tcp6 0 0 :::22 :::* LISTEN -
udp 0 0 0.0.0.0:60855 0.0.0.0:* -
udp 0 0 127.0.1.1:53 0.0.0.0:* -
udp 0 0 0.0.0.0:68 0.0.0.0:* -
udp 0 0 0.0.0.0:631 0.0.0.0:* -
udp 0 0 0.0.0.0:5353 0.0.0.0:* -
udp6 0 0 :::44164 :::* -
udp6 0 0 :::5353 :::* -
4、使用内网的另外一台ubuntu系统机子：
输入 curl 192.168.31.172:27017 ，返回It looks like you are trying to access MongoDB over HTTP on the native driver port.
说明连接成功
或者中浏览器地址栏中输入http://192.168.31.172:27017/，enter后，回复上面相同的内容