참고자료

https://btcd.tistory.com/1487 https://stackoverflow.com/questions/58526531/nginx-no-such-file-or-directory https://wikidocs.net/177312

https://yelimkim98.tistory.com/37 https://yunamom.tistory.com/226 https://velog.io/@utcloud/Letsencrypt-%EC%9D%B8%EC%A6%9D%EC%84%9C-%EB%B0%9C%EA%B8%89%EB%B0%9B%EA%B8%B0 https://soyoung-new-challenge.tistory.com/116

https://www.digitalocean.com/community/tutorials/how-to-serve-flask-applications-with-gunicorn-and-nginx-on-ubuntu-18-04