输入命令
mongod
抛出异常：
2018-06-02T03:10:00.342+0000 [initandlisten] ERROR: listen(): bind() failed errno:98 Address already in use for socket: 0.0.0.0:27017
2018-06-02T03:10:00.343+0000 [initandlisten] ERROR: addr already in use
是端口被占用。找出是什么进程占用了这个端口（话说我新买的服务器啊而且更新过了，mongod 也是新装的。奇了个怪）
ps aux | grep mongod
输出
mongodb 676 0.5 4.9 389348 50004 ? Ssl Jun01 3:43 /usr/bin/mongod --config /etc/mongodb.conf
root 30784 0.0 0.1 14516 1020 pts/0 S+ 03:12 0:00 grep --color=auto --exclude-dir=.bzr --exclude-dir=CVS --exclude-dir=.git --exclude-dir=.hg --exclude-dir=.svn mongod
看到有个 676（什么鬼）？？？，将此杀掉即可
kill -9 676
先把我的项目打开，
gunicorn wsgi -c gunicorn.config.py
重新运行mongod
mongod
输出
mongod --help for help and startup options
2018-06-02T03:15:34.158+0000 [initandlisten] MongoDB starting : pid=30884 port=27017 dbpath=/data/db 64-bit host=192.168.177.128
2018-06-02T03:15:34.158+0000 [initandlisten] db version v2.6.10
2018-06-02T03:15:34.158+0000 [initandlisten] git version: nogitversion
2018-06-02T03:15:34.158+0000 [initandlisten] OpenSSL version: OpenSSL 1.0.2g 1 Mar 2016
2018-06-02T03:15:34.158+0000 [initandlisten] build info: Linux lgw01-12 3.19.0-25-generic #26~14.04.1-Ubuntu SMP Fri Jul 24 21:16:20 UTC 2015 x86_64 BOOST_LIB_VERSION=1_58
2018-06-02T03:15:34.158+0000 [initandlisten] allocator: tcmalloc
2018-06-02T03:15:34.158+0000 [initandlisten] options: {}
2018-06-02T03:15:34.160+0000 [initandlisten] journal dir=/data/db/journal
2018-06-02T03:15:34.160+0000 [initandlisten] recover : no journal files present, no recovery needed
2018-06-02T03:15:34.229+0000 [initandlisten] waiting for connections on port 27017
2018-06-02T03:15:34.320+0000 [initandlisten] connection accepted from 127.0.0.1:33928 #1 (1 connection now open)
2018-06-02T03:15:34.322+0000 [initandlisten] connection accepted from 127.0.0.1:33930 #2 (2 connections now open)
2018-06-02T03:16:34.218+0000 [clientcursormon] mem (MB) res:47 virt:381
2018-06-02T03:16:34.219+0000 [clientcursormon] mapped (incl journal view):160
2018-06-02T03:16:34.219+0000 [clientcursormon] connections:2
成功！
