由于ubuntu16默认用的python3.5，需要重新安装一个3.8的python

sudo apt install build-essential zlib1g-dev libncurses5-dev libgdbm-dev libnss3-dev libssl-dev libreadline-dev libffi-dev wgetwget https://www.python.org/ftp/python/3.8.0/Python-3.8.0.tar.xz
tar -xf Python-3.8.0.tar.xz
cd Python-3.8.0
./configure prefix=/usr/local/python3
make
sudo make altinstall
sudo rm /usr/bin/python
sudo ln -s /usr/local/python3/bin/python3.8 /usr/bin/python
sudo rm /usr/bin/python
sudo ln -s /usr/local/python3/bin/python3.8 /usr/bin/python3
sudo rm /usr/bin/pip
sudo ln -s /usr/local/python3/bin/pip3.8 /usr/bin/pip
sudo rm /usr/bin/pip3
sudo ln -s /usr/local/python3/bin/pip3.8 /usr/bin/pip3

cd到项目目录，安装缺失的库

sudo pip3 install -r requirement.txt

运行时候会出现_sqlite3找不到

Modulenetfounderror: no module named'_sqlite3'

安装下面这个库

sudo apt-get install libsqlite3-dev

重新上面的步骤，编译一把python即可

cd Python-3.8.0
./configure prefix=/usr/local/python3
make
sudo make altinstall

安装ngnix

sudo apt-get install nginx
sudo /etc/init.d/nginx start

打开浏览器访问你的服务器，输入http://localhost/，你应该能看到Nginx欢迎页.

配置Nginx

首先删除掉Nginx的默认配置文件：

sudo rm /etc/nginx/sites-enabled/default

创建一个我们应用使用的新配置文件/etc/nginx/sites-enabled/my_nginx.conf：

upstream flask{server 127.0.0.1:5000;server 127.0.0.1:5001;
}server {# 监听80端口listen 80;# 本机server_name localhost;# 默认请求的urllocation / {#请求转发到gunicorn服务器proxy_pass http://flask;#设置请求头，并将头信息传递给服务器端proxy_set_header Host $host;}
}

配置gunicorn

安装命令如下：

pip3 install gunicorn

安装信息如下：

[root@server01 ~]# pip3 install gunicorn
Looking in indexes: https://mirrors.aliyun.com/pypi/simple/
Collecting gunicorn
  Downloading https://mirrors.aliyun.com/pypi/packages/69/ca/926f7cd3a2014b16870086b2d0fdc84a9e49473c68a8dff8b57f7c156f43/gunicorn-20.0.4-py2.py3-none-any.whl (77kB)
     |████████████████████████████████| 81kB 7.1MB/s 
Requirement already satisfied: setuptools>=3.0 in /usr/local/python3/lib/python3.7/site-packages (from gunicorn) (39.0.1)
Installing collected packages: gunicorn
Successfully installed gunicorn-20.0.4
WARNING: You are using pip version 19.2.1, however version 19.3.1 is available.
You should consider upgrading via the 'pip install --upgrade pip' command.

配置全局命令：安装完毕之后，全局环境是无法直接执行的，需要找到二进制文件软链接到​​/usr/bin​​路径下。

# 安装之后，无法直接执行命令
[root@server01 ~]# gunicorn -h
-bash: gunicorn: command not found

搜索安装之后，​​gunicorn二进制可执行文件​​的位置：

[root@server01 ~]# find / -name "*gunicorn*" -ls | grep python3 | grep bin
405121    4 -rwxr-xr-x   1 root     root          236 Dec 12 08:31 /usr/local/python3/bin/gunicorn

设置软链接如下：

[root@server01 ~]# ln -s /usr/local/python3/bin/gunicorn /usr/bin/gunicorn
[root@server01 ~]# 
[root@server01 ~]# ls -ll /usr/bin/gunicorn
lrwxrwxrwx 1 root root 31 Dec 12 08:38 /usr/bin/gunicorn -> /usr/local/python3/bin/gunicorn

配置软链接之后，就可以全局环境使用gunicorn了，例如查看版本如下：

[root@server01 ~]# gunicorn -v
gunicorn (version 20.0.4)
 

启动项目

cd到项目目录下

export环境变量

export DEBUG=True
export FLASK_ENV=development

gunicorn -w 4 -b 127.0.0.1:5000 --access-logfile access.log --error-logfile error.log run:app

重启nginx

sudo nginx -s reload

后台运行的话加一个-D参数

gunicorn -D -w 4 -b 127.0.0.1:5000 --access-logfile access.log --error-logfile error.log run:app