python + flask + uwsgi + gevent + nginx 环境搭建（非阻塞）
Flask是Python中一个微型的Web开发框架。在debug 模式 或 单纯的 uwsgi模式下，flask是阻塞模式的，也就是说一次只能效应一个请求，或者在uwsgi 开启多进程，响应已知的请求个数；我们这里使用 uwsgi 和 gevent 配合nginx 解决flask的阻塞模式。
1、环境
CentOS Linux release 7.0.1406 (Core)
Python 2.7.5
2、安装类库
yum install python-devel zlib-devel bzip2-devel pcre-devel openssl-devel ncurses-devel sqlite-devel readline-devel tk-devel gcc
3、下载并安装python 包管理软件 pip
查看python 版本
[root@localhost ~]# python -V
Python 2.7.5
下载 pip-7.1.0.tar.gz
wget https://pypi.python.org/packages/source/p/pip/pip-7.1.0.tar.gz#md5=d935ee9146074b1d3f26c5f0acfd120e
解压安装
tar zxf pip-7.1.0.tar.gz
cd pip-7.1.0
python setup.py install
## 提示下列信息，，且无报错，说明安装成功
Installed /usr/lib/python2.7/site-packages/pip-7.1.0-py2.7.egg
Processing dependencies for pip==7.1.0
Finished processing dependencies for pip==7.1.0
下载 setuptools-18.1.tar.gz
wget https://pypi.python.org/packages/source/s/setuptools/setuptools-18.1.tar.gz#md5=f72e87f34fbf07f299f6cb46256a0b06
## 解压安装
tar zxf setuptools-18.1.tar.gz
cd setuptools-18.1
python setup.py install
## 提示下列信息，，且无报错，说明安装成功
Installed /usr/lib/python2.7/site-packages/setuptools-18.1-py2.7.egg
Processing dependencies for setuptools==18.1
Finished processing dependencies for setuptools==18.1
4、安装 flask / uwsgi / gevent / nignx
### 安装 flask
pip install flask
## 提示下列信息，，且无报错，说明安装成功
Successfully installed Jinja2-2.8 MarkupSafe-0.23 Werkzeug-0.10.4 flask-0.10.1 itsdangerous-0.24
### 安装uwsgi
pip install uwsgi
## 提示下列信息，，且无报错，说明安装成功
Collecting uwsgi
Using cached uwsgi-2.0.11.1.tar.gz
Installing collected packages: uwsgi
Running setup.py install for uwsgi
Successfully installed uwsgi-2.0.11.1
### 安装gevent
pip install gevent
## 提示下列信息，，且无报错，说明安装成功
Running setup.py install for greenlet
Running setup.py install for gevent
Successfully installed gevent-1.0.2 greenlet-0.4.7
### 下载 并 编译安装nginx
useradd www
wget http://nginx.org/download/nginx-1.8.0.tar.gz
tar zxf nginx-1.8.0.tar.gz
cd nginx-1.8.0
./configure --prefix=/usr/local/nginx --user=www --group=www --with-http_stub_status_module --with-http_ssl_module
make
make install
5、 新建flask app 文件 /data/wwwroot/myapp.py
[root@localhost ~]# mkdir /data/wwwroot -p
[root@localhost ~]# cd /data/wwwroot/
[root@localhost wwwroot]# cat myapp.py
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello_world():
return 'Hello World!'
if __name__ == '__main__':
app.run()
6、配置 uWSGI 及 gevent
（1）配置 uwsgi.ini 文件 vim /usr/local/nginx/conf/uwsgi.ini
[uwsgi]
chmod-socket = 666
socket = /tmp/uwsgi.sock
master = true
pidfile = /var/run/uwsgi.pid
processes = 4
workers = 1
pythonpath = /data/wwwroot ##flask app 目录
pythonpath = /data/
callable = app
profiler= true
memory-report=true
enable-threads = true
logdate=true
limit-as=6048
daemonize=/data/wwwroot/uwsgi_sapublish.log
gevent = 100 ## 加入 gevent = 100 ，非阻塞模式
（2） 再次配置 cat /data/wwwroot/myapp.py
## 在文件头加入下面两行
from gevent import monkey
monkey.patch_all()
from flask import Flask
app = Flask(__name__)
@app.route('/')
def hello_world():
return 'Hello World!'
if __name__ == '__main__':
app.run()
（3）启动 uwsgi ，当然你可以自己写个启动脚本，这里测试就不写了
/usr/bin/uwsgi --ini /usr/local/nginx/conf/uwsgi.ini
7、配置nginx
（1）添加配置文件 cat /usr/local/nginx/conf/vhosts/uwsgi_flask.conf
server {
listen 8082 default_server;
server_name 192.168.1.105 ;
location / {
#uwsgi_pass 127.0.0.1:5000;
include uwsgi_params;
uwsgi_pass unix:/tmp/uwsgi.sock;
uwsgi_param UWSGI_CHDIR /data/wwwroot/;
uwsgi_param UWSGI_SCRIPT myapp; ### myapp.py app文件名称
access_log /data/wwwroot/app_access.log;
}
}
（2）修改nginx ；加入include vhosts/uwsgi_flask.conf;
（3）启动nginx
cd /usr/local/nginx/sbin/
./nginx
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