通过uwsgi+nginx启动flask的python web程序

一般我们启动python web程序的时候都是通过python直接启动主文件，测试的时候是可以的，当访问量大的时候就会出问题
python manage.py

通过wsgi web服务器网关接口规范启动是一种比较好的方式：

web服务器 nginx + uwsgi + flask

原理就是nginx通过代理访问通过uwsgi启动监听在本机的flask程序

1.安装uwsgi模块
# pip install uwsgi
2.通过uwsgi启动flask项目
# 通过http方式启动（推荐）
# uwsgi --http 127.0.0.1:9999 -w user:app

# 通过socket方式启动
uwsgi -s 127.0.0.1:9999 -w user:app
# 主入口需要__init__.py文件
user/__init__.py

#cat /etc/nginx/conf.d/cmdb.conf
server {listen8080;server_name  cmdb;location/{root/home/python/Desktop/51reboot/cmdb/;index  index.html index.htm;proxy_pass http://127.0.0.1:9999;}
}

访问方式是：
http://192.168.3.91:8080 --> uwsgi:9999

centos6.8_x64安装python3.7.2和wusgiwget https://www.python.org/ftp/python/3.7.2/Python-3.7.2.tar.xztar -xf Python-3.7.2.tar.xz
cd Python-3.7.2
mkdir /usr/local/python372
./configure --prefix=/usr/local/python372make
make install# 报错from _ctypes import Union, Structure, Array
ModuleNotFoundError: No module named'_ctypes'# 解决办法：yum install libffi-devel libffi# 再次编译安装即可./configure --with-ssl --prefix=/usr/local/python372make
make install
echo $?# 删除原来的软链，重新建立软连接
#rm -f /usr/local/python3
cd/usr/localln -s python372 python3[root@srv3:/usr/local/python3]# python3 -V
Python3.7.2# 安装ipython# pip3 install ipython# ln -s /usr/local/python372/bin/ipython3 /usr/sbin/ipython3

[root@srv3:/usr/local/uwsgi]# tar zxf uwsgi-latest.tar.gz
[root@srv3:/usr/local/uwsgi]# cd uwsgi-uwsgi-2.0.18/        uwsgi-latest.tar.gz
[root@srv3:/usr/local/uwsgi]# cd uwsgi-2.0.18/[root@srv3:/usr/local/uwsgi/uwsgi-2.0.18]# python3 uwsgiconfig.py --build################# uWSGI configuration #################kernel=Linux
execinfo=False
ifaddrs=True
locking=pthread_mutex
event=epoll
timer=timerfd
filemonitor=inotify
pcre=True
routing=True
capabilities=False
yaml=embedded
json=False
ssl=True
xml=libxml2
debug=False
plugin_dir=.
zlib=True
ucontext=True
malloc=libc############## end of uWSGI configuration #############
total buildtime: 3seconds*** uWSGI is ready, launch it with ./uwsgi ***# 继续install
# python3 setup.pyinstall[root@srv3:~]# whereisuwsgi
uwsgi:/usr/bin/uwsgi /etc/uwsgi /usr/local/bin/uwsgi /usr/local/uwsgi /opt/uwsgi-2.0.13.1/bin/uwsgi
[root@srv3:~]# uwsgi --version2.0.18# 编写测试文件
[root@srv3:/usr/local/uwsgi/uwsgi-2.0.18]# cattestuwsgi.py
def application(env, start_response):start_response('200 OK', [('Content-Type','text/html')])return [b"Hello World"]# 启动
[root@srv3:/usr/local/uwsgi/uwsgi-2.0.18]# ./uwsgi --http :9000 --wsgi-filetestuwsgi.py*** Starting uWSGI 2.0.18 (64bit) on [Wed Jun 19 02:39:19 2019] ***compiled with version:4.4.7 20120313 (Red Hat 4.4.7-23) on 19 June 2019 07:37:03os: Linux-2.6.32-642.6.2.el6.x86_64 #1 SMP Wed Oct 26 06:52:09 UTC 2016nodename: srv3.keepvid.com
machine: x86_64
clock source: unix
pcre jit disabled
detected number of CPU cores:24current working directory:/usr/local/uwsgi/uwsgi-2.0.18detected binary path:/usr/local/uwsgi/uwsgi-2.0.18/uwsgi
uWSGI running as root, you can use--uid/--gid/--chrootoptions*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
*** WARNING: you are running uWSGI without its master process manager ***your processes number limit is128183your memory page size is4096bytes
detected maxfile descriptor number: 65536lock engine: pthread robust mutexes
thunder lock: disabled (you can enable it with--thunder-lock)
uWSGI http bound on :9000 fd 4spawned uWSGI http1 (pid: 927)
uwsgi socket0 bound to TCP address 127.0.0.1:25232 (port auto-assigned) fd 3uWSGI running as root, you can use--uid/--gid/--chrootoptions*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***Python version:3.7.2 (default, Jun 19 2019, 02:23:57)  [GCC 4.4.7 20120313 (Red Hat 4.4.7-17)]*** Python threads support is disabled. You can enable it with --enable-threads ***Python main interpreter initialized at0x1e8dcd0uWSGI running as root, you can use--uid/--gid/--chrootoptions*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***your server socket listen backlog is limited to100connections
your mercyfor graceful operations on workers is 60seconds
mapped72920 bytes (71 KB) for 1cores*** Operational MODE: single process ***WSGI app0 (mountpoint='') ready in 0 seconds on interpreter 0x1e8dcd0 pid: 926(default app)
uWSGI running as root, you can use--uid/--gid/--chrootoptions*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
*** uWSGI is running in multiple interpreter mode ***spawned uWSGI worker1 (and the only) (pid: 926, cores: 1)
[pid:926|app: 0|req: 1/1] 127.0.0.1 () {28 vars in 298 bytes} [Wed Jun 19 02:39:58 2019] GET / => generated 11 bytes in 0 msecs (HTTP/1.1 200) 1 headers in 44 bytes (1 switches on core 0)# 验证
[root@srv3:~]# curl http://127.0.0.1:9000/
Hello World

./configure --with-ssl --prefix=/usr/local/python372
编译的时候一定要添加 --with-ssl 否则pip3 install -r 安装模块时会报错：
pip is configured with locations that require TLS/SSL, however the ssl module in Python is not avail