通过uwsgi+nginx启动flask的python web程序

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 {
    listen       8080;
    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..2和wusgi

wget https://www.python.org/ftp/python/3.7.2/Python-3.7.2.tar.xz

tar -xf Python-3.7..tar.xz
cd Python-3.7.
mkdir /usr/local/python372
./configure --prefix=/usr/local/python372
make
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/python372
make
make install
echo $?

# 删除原来的软链，重新建立软连接
# rm -f /usr/local/python3
cd /usr/local
ln -s python372 python3

[root@srv3:/usr/local/python3]# python3 -V
Python 3.7.

# 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./        uwsgi-latest.tar.gz
[root@srv3:/usr/local/uwsgi]# cd uwsgi-2.0./
[root@srv3:/usr/local/uwsgi/uwsgi-2.0.]# 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 build time:  seconds
*** uWSGI is ready, launch it with ./uwsgi ***

# 继续install
# python3 setup.py install

[root@srv3:~]# whereis uwsgi
uwsgi: /usr/bin/uwsgi /etc/uwsgi /usr/local/bin/uwsgi /usr/local/uwsgi /opt/uwsgi-2.0.13.1/bin/uwsgi
[root@srv3:~]# uwsgi --version
2.0.

# 编写测试文件
[root@srv3:/usr/local/uwsgi/uwsgi-2.0.]# cat testuwsgi.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.]# ./uwsgi --http : --wsgi-file testuwsgi.py
*** Starting uWSGI 2.0. (64bit) on [Wed Jun  :: ] ***
compiled with version: 4.4.  (Red Hat 4.4.-) on  June  ::
os: Linux-2.6.-642.6..el6.x86_64 # SMP Wed Oct  :: UTC
nodename: srv3.keepvid.com
machine: x86_64
clock source: unix
pcre jit disabled
detected number of CPU cores:
current working directory: /usr/local/uwsgi/uwsgi-2.0.
detected binary path: /usr/local/uwsgi/uwsgi-2.0./uwsgi
uWSGI running as root, you can use --uid/--gid/--chroot options
*** 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 is
your memory page size is  bytes
detected max file descriptor number:
lock engine: pthread robust mutexes
thunder lock: disabled (you can enable it with --thunder-lock)
uWSGI http bound on : fd
spawned uWSGI http  (pid: )
uwsgi socket  bound to TCP address 127.0.0.1: (port auto-assigned) fd
uWSGI running as root, you can use --uid/--gid/--chroot options
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
Python version: 3.7. (default, Jun  , ::)  [GCC 4.4.  (Red Hat 4.4.-)]
*** Python threads support is disabled. You can enable it with --enable-threads ***
Python main interpreter initialized at 0x1e8dcd0
uWSGI running as root, you can use --uid/--gid/--chroot options
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
your server socket listen backlog is limited to  connections
your mercy for graceful operations on workers is  seconds
mapped  bytes ( KB) for  cores
*** Operational MODE: single process ***
WSGI app  (mountpoint='') ready in  seconds on interpreter 0x1e8dcd0 pid:  (default app)
uWSGI running as root, you can use --uid/--gid/--chroot options
*** WARNING: you are running uWSGI as root !!! (use the --uid flag) ***
*** uWSGI is running in multiple interpreter mode ***
spawned uWSGI worker  (and the only) (pid: , cores: )
[pid: |app: |req: /] 127.0.0.1 () { vars in  bytes} [Wed Jun  :: ] GET / => generated  bytes in  msecs (HTTP/1.1 )  headers in  bytes ( switches on core )

# 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 (cenos7.x上可以)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

centos6安装python3.7.x参考 https://www.cnblogs.com/reblue520/p/11103311.html