如何在 Docker 容器中运行 Nginx 并将其设置为每 6 小时重新加载一次配置？

Question

I'm runnign NGINX in a Docker container, and I'm trying to find a way to start it up using docker run in a way that would order my NGINX to reload its configuration every 6h. I need this to be done, because I also use Certbot in another container, and I'd like the SSL certificate renewal process to be automated and applied, and for that I neen NGINX to reload its configuration on schedule.

At this point I use the folowing docker run sequence (more or less):

docker run --restart=always -d -p 80:80 -p 443:443 \\ --name=nginx_RevPr nginx:latest \\ /bin/bash -c 'while :; do sleep 6h & wait ${!}; nginx -s reload; done & nginx -g "daemon off;"'

The container created this way is running and working fine. The only problem I have is that I actually don't know if NGINX is really realoading its configuration. docker logs doesn't show anything.

I'd like to approach this problem in a twofold way:

1. How can I output to terminal / docker logs ( echo ?) the succcessful nginx -s reload modifying my /bin/bash -c 'while :; do sleep 6h & wait ${!}; nginx -s reload; done & nginx -g "daemon off;"' /bin/bash -c 'while :; do sleep 6h & wait ${!}; nginx -s reload; done & nginx -g "daemon off;"' /bin/bash -c 'while :; do sleep 6h & wait ${!}; nginx -s reload; done & nginx -g "daemon off;"' ?
2. In case I miss something (I'm a beginner for both Docker and NGINX): do you see a way to achieve the results I'd like to get in a more reasonable way?

Please don't suggest Docker Compose.

Thank you for your attention.

Answer 1

OK, I got it working. I changed the CMD args line to:

/bin/sh -c 'while :; do sleep 6h & wait ${!}; nginx -s reload && echo NGINX config reload for Certbot - OK; done & nginx -g "daemon off;"'

My main mistake was to enter the CMD using /bin/bash , where I should do /bin/sh . And the following nginx -s reload && echo NGINX config reload for Certbot - OK solved the problem with notyfying docker logs about config reload.