测试开发环境
uvicorn server:app --reload
但是生产环境需要配置的项目要更多，例如：
- 指定端口号
- 如何利用多核。python 的历史问题
- nginx 配置
- systemd 配置
uvicorn 是什么
Uvicorn is a lightning-fast ASGI server implementation, using uvloop and httptools.
与 Gunicorn 一同使用
参考 uvicorn 及 FastAPI 的官方文档：
- https://www.uvicorn.org/#running-with-gunicorn
- https://fastapi.tiangolo.com/deployment/server-workers/
都建议在生产环境配合 Gunicorn 一起使用。原因是：
- 方便的管理 work 进程数。主要是为了充分利用服务器的多核；虽然 unicorn 也能指定 work 数，但是不监控进程的状态，所以就不能保活？
- work 进程可以平滑重启
- 升级无需宕机
示例：
gunicorn server:app -w 4 -k uvicorn.workers.UvicornWorker --bind 127.0.0.1:9012
安装 gunicorn
pip install "uvicorn[standard]" gunicorn
配置 systemd
如果只单纯运行 gunicorn，会发现其没有自动进入后台运行
> gunicorn server:app -w 4 -k uvicorn.workers.UvicornWorker --bind 127.0.0.1:9012
[2022-02-24 22:16:04 +0800] [1133099] [INFO] Starting gunicorn 20.1.0
[2022-02-24 22:16:04 +0800] [1133099] [INFO] Listening at: http://127.0.0.1:9012 (1133099)
[2022-02-24 22:16:04 +0800] [1133099] [INFO] Using worker: uvicorn.workers.UvicornWorker
[2022-02-24 22:16:04 +0800] [1133101] [INFO] Booting worker with pid: 1133101
[2022-02-24 22:16:04 +0800] [1133102] [INFO] Booting worker with pid: 1133102
[2022-02-24 22:16:04 +0800] [1133103] [INFO] Booting worker with pid: 1133103
[2022-02-24 22:16:04 +0800] [1133104] [INFO] Booting worker with pid: 1133104
[2022-02-24 22:16:06 +0800] [1133101] [INFO] Started server process [1133101]
[2022-02-24 22:16:06 +0800] [1133101] [INFO] Waiting for application startup.
[2022-02-24 22:16:06 +0800] [1133101] [INFO] Application startup complete.
[2022-02-24 22:16:06 +0800] [1133102] [INFO] Started server process [1133102]
[2022-02-24 22:16:06 +0800] [1133102] [INFO] Waiting for application startup.
[2022-02-24 22:16:06 +0800] [1133102] [INFO] Application startup complete.
[2022-02-24 22:16:06 +0800] [1133103] [INFO] Started server process [1133103]
[2022-02-24 22:16:06 +0800] [1133103] [INFO] Waiting for application startup.
[2022-02-24 22:16:06 +0800] [1133103] [INFO] Application startup complete.
[2022-02-24 22:16:06 +0800] [1133104] [INFO] Started server process [1133104]
[2022-02-24 22:16:06 +0800] [1133104] [INFO] Waiting for application startup.
[2022-02-24 22:16:06 +0800] [1133104] [INFO] Application startup complete.
^C[2022-02-24 22:16:12 +0800] [1133099] [INFO] Handling signal: int
[2022-02-24 22:16:12 +0800] [1133099] [WARNING] Worker with pid 1133101 was terminated due to signal 3
[2022-02-24 22:16:12 +0800] [1133099] [WARNING] Worker with pid 1133104 was terminated due to signal 3
[2022-02-24 22:16:12 +0800] [1133099] [WARNING] Worker with pid 1133102 was terminated due to signal 3
[2022-02-24 22:16:12 +0800] [1133099] [WARNING] Worker with pid 1133103 was terminated due to signal 3
[2022-02-24 22:16:12 +0800] [1133099] [INFO] Shutting down: Master
将之前的 golang 服务的 systemd 配置文件复制一份，修改一下 gunicorn 的路径即可。
$ which gunicorn
/home/username/.local/bin/gunicorn
sudo systemctl enable some.service
sudo systemctl start some.service
sudo systemctl status some.service
部署还是太麻烦
python 的线上部署，不但比不过 golang，连 php 都不如。 概念多，流程复杂，对新手很不友好。而且性能还拿不出手，悲剧。
TODO
- done: git 拉取代码
- done: 安装 uvicorn, gunicorn
- done: 测试能否运行起来。uvicorn server:app --reload
- done: 整理各服务的端口占用情况，存在根目录的文件中，方便给新服务分配端口
- nginx 配置：端口及 static 目录
- systemd 配置
ImportError: libGL.so.1
运行
uvicorn server:app --reload
报错：
ImportError: libGL.so.1: cannot open shared object file: No such file or directory
解决方法：
sudo apt update
sudo apt install libgl1
参考
- https://dev.to/shuv1824/deploy-fastapi-application-on-ubuntu-with-nginx-gunicorn-and-uvicorn-3mbl
- https://blog.nawaz.info/deploy-fastapi-application-on-ubuntu-with-nginx-gunicorn-and-uvicorn
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