Tornado

$ uname -a

# 检查内核版本
$ uname -r

$ python -V
Python 2.7.15+
$ whereis python
python: /usr/bin/python2.7 /usr/bin/python2.7-config /usr/bin/python3.6 /usr/bin/python /usr/bin/python3.6m /usr/lib/python2.7 /usr/lib/python3.6 /usr/lib/python3.7 /etc/python2.7 /etc/python3.6 /etc/python /usr/local/lib/python2.7 /usr/local/lib/python3.6 /usr/include/python2.7 /usr/include/python3.6m /usr/share/python /usr/share/man/man1/python.1.gz

$ pip -V
pip 9.0.1 from /usr/lib/python2.7/dist-packages (python 2.7)
$ whereis pip
pip: /usr/bin/pip /usr/share/man/man1/pip.1.gz
$ type pip
pip 已被录入哈希表 (/usr/bin/pip)

$ python2 -V
Python 2.7.15+
python2: /usr/bin/python2.7 /usr/bin/python2.7-config /usr/bin/python2 /usr/lib/python2.7 /etc/python2.7 /usr/local/lib/python2.7 /usr/include/python2.7 /usr/share/man/man1/python2.1.gz

$ python3 -V
Python 3.6.8
$ whereis python3
python3: /usr/bin/python3 /usr/bin/python3.6 /usr/bin/python3.6m /usr/lib/python3 /usr/lib/python3.6 /usr/lib/python3.7 /etc/python3 /etc/python3.6 /usr/local/lib/python3.6 /usr/include/python3.6m /usr/share/python3 /usr/share/man/man1/python3.1.gz

$ sudo apt-get update
$ sudo apt-get install python3

$ sudo update-alternative --install /usr/bin/python3 python3 /usr/bin/python3.6 1

$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 100
$ sudo update-alternatives --install /usr/bin/python python /usr/bin/python3 150
$ python -V
Python 3.6.8

$ sudo apt install python-pip
$ sudo apt install python3-pip
$ pip -V
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6)
$ pip2 -V
pip 19.1.1 from /usr/local/lib/python2.7/dist-packages/pip (python 2.7)
$ pip3 -V
pip 9.0.1 from /usr/lib/python3/dist-packages (python 3.6)
$ whereis pip3
pip3: /usr/bin/pip3 /usr/share/man/man1/pip3.1.gz

$ sudo pip install --upgrade pip
$ pip -V
Traceback (most recent call last):
  File "/usr/bin/pip", line 9, in <module>
    from pip import main
ModuleNotFoundError: No module named ‘pip‘

$ sudo pip -V

# pip版本回退
$ sudo python3 -m pip install --user --upgrade pip==9.0.1

$ sudo apt-get remove python-pip
$ sudo apt-get remove python2-pip
$ duso apt-get remove python3-pip

$ pip list

$ pip install tornado
Successfully installed tornado-6.0.3

$ python
>>> import tornado

$ vim server.py

#! /usr/bin/python
# encoding:utf-8

# 导入Tornado模块
import tornado.ioloop #核心IO循环模块
import tornado.httpserver #异步非阻塞HTTP服务器模块
import tornado.web #Web框架模块
import tornado.options #解析终端参数模块

#从终端模块中导出define模块用于读取参数，导出options模块用于设置默认参数
from tornado.options import define, options

# 定义端口用于指定HTTP服务监听的端口
# 如果命令行中带有port同名参数则会称为全局tornado.options的属性，若没有则使用define定义。
define("port", type=int, default=8000, help="run on the given port")

# 创建请求处理器
# 当处理请求时会进行实例化并调用HTTP请求对应的方法
class IndexHandler(tornado.web.RequestHandler):
    # 定义get方法对HTTP的GET请求做出响应
    def get(self):
        # 从querystring查询字符串中获取id参数的值，若无则默认为0.
        id = self.get_argument("id", 0)
        # write方法将字符串写入HTTP响应
        self.write("hello world id = " + id)

# 创建路由表
urls = [(r"/", IndexHandler),]

# 定义服务器
def main():
    # 解析命令行参数
    tornado.options.parse_command_line()
    # 创建应用实例
    app = tornado.web.Application(urls)
    # 监听端口
    app.listen(options.port)
    # 创建IOLoop实例并启动
    tornado.ioloop.IOLoop.current().start()

# 应用运行入口，解析命令行参数
if __name__ == "__main__":
    # 启动服务器
    main()

$ python server.py

$ curl http://127.0.0.1:8000

# 安装
$ pip install supervisor

# 配置
$ echo_supervisord_conf  > /etc/supervisord.conf

# 开启配置
$ vim /etc/supervisord.conf
;[include]
files = /etc/supervisor/*.ini

# 创建配置
$ mkdir /etc/supervisor
$ cd /etc/supervisor
$ vim tornado.ini
[program:tornado]
command=python3 /home/tornado/server.py --port=8000
directory=/home/tornado/
autorestart=true
redirect_stderr=true

# 重启进程
$ ps aux |  grep supervisord
$ supervisord -c /etc/supervisor.conf

$ vim server.py