gunicorn基本使用

一、简介

Gunicorn被广泛应用的高性能的Python HTTP Server。用来解析HTTP请求的网关服务。
它介于web 服务器和应用之间。例如： nginx --> gunicorn --> Flask
特点:
1.能和大多数的Python Web框架兼容
2.简单易上手
3.轻量级的资源消耗
4.目前，gunicorn只能运行在Linux环境中，不支持windows平台

二、安装

pip3 install gunicorn

查看安装信息

[root@node-2 ~]# pip3 show gunicorn
Name: gunicorn
Version: 21.2.0
Summary: WSGI HTTP Server for UNIX
Home-page: https://gunicorn.org
Author: Benoit Chesneau
Author-email: benoitc@gunicorn.org
License: MIT
Location: /usr/local/lib/python3.6/site-packages
Requires: packaging, importlib-metadata

1.使用python启动flask

[root@node-2 python]# python3 main.py

#查看进程
[root@node-2 ~]# ps aux |grep main
root       1546  0.1  1.2 237028 25100 pts/0    S+   00:40   0:00 python3 main.py
root       1550  0.6  1.2 329892 25668 pts/0    Sl+  00:40   0:00 /usr/bin/python3 /root/pangbb/main.py

2.启动前

2.1 先查看系统cpu数量

[root@node-2 ~]# cat /proc/cpuinfo |grep processor
processor	: 0
processor	: 1
processor	: 2
processor	: 3
processor	: 4
processor	: 5

2.2 启动参数

2.3 样例代码

[root@node-2 python]# cat main.py 
from  flask  import Flask

app = Flask(__name__)

@app.route("/")
def index():
        return "index"
    
if __name__ == "__main__":
        app.run(debug=True,host='0.0.0.0')

三、启动

1.命令行启动

这里暂时没有使用-D ，为了看到启动过程。
解释：

gunicorn -w 4 -b 0.0.0.0:6666 main:app

main: 是启动文件名称
app: 是Flask(__name__)的实例化名称，也就是 app = Flask(__name__) 中的app

[root@node-2 python]# gunicorn -w 4 -b 0.0.0.0:6666 main:app
[2024-01-08 01:53:09 -0500] [1644] [INFO] Starting gunicorn 21.2.0
[2024-01-08 01:53:09 -0500] [1644] [INFO] Listening at: http://0.0.0.0:6666 (1644)  #此进程加上下边4个进程 正好5个进程
[2024-01-08 01:53:09 -0500] [1644] [INFO] Using worker: sync
[2024-01-08 01:53:09 -0500] [1647] [INFO] Booting worker with pid: 1647
[2024-01-08 01:53:09 -0500] [1648] [INFO] Booting worker with pid: 1648
[2024-01-08 01:53:09 -0500] [1650] [INFO] Booting worker with pid: 1650
[2024-01-08 01:53:09 -0500] [1651] [INFO] Booting worker with pid: 1651

启动后的进程数量

[root@node-2 python]# ps aux |grep main
1644  0.2  0.8 216700 18068 pts/0    S+   01:53   0:00 /usr/bin/python3 /usr/local/bin/gunicorn -w 4 -b 0.0.0.0:6666 main:app
1647  0.3  1.2 240776 24468 pts/0    S+   01:53   0:00 /usr/bin/python3 /usr/local/bin/gunicorn -w 4 -b 0.0.0.0:6666 main:app
1648  0.3  1.2 240672 24448 pts/0    S+   01:53   0:00 /usr/bin/python3 /usr/local/bin/gunicorn -w 4 -b 0.0.0.0:6666 main:app
1650  0.3  1.2 240672 24452 pts/0    S+   01:53   0:00 /usr/bin/python3 /usr/local/bin/gunicorn -w 4 -b 0.0.0.0:6666 main:app
1651  0.3  1.2 240672 24500 pts/0    S+   01:53   0:00 /usr/bin/python3 /usr/local/bin/gunicorn -w 4 -b 0.0.0.0:6666 main:app

2.命令行后台启动

短参数

gunicorn -D -w 4 -b 0.0.0.0:6666 main:app

长参数启动

gunicorn -D --workers=4 --bind=0.0.0.0:6666   main:app

记录日志

gunicorn -D --workers=4 --bind=0.0.0.0:6666 --access-logfile=./access.log --error-logfile=./error.log main:app