HAProxy ACL Configuration for Specific Hours and Email Alerts

Help!
1

Hi all! \o/

We are using HAProxy 2.3.7 on AlmaLinux, and we’re wondering if there is any configuration option to set an ACL based on specific hours (for example, during the night from 22:00 to 06:00 the next day) and apply this ACL to email alerts for the backends.

We would like to apply this kind of configuration to reduce cloud costs by shutting down the backends during low-activity hours at night and powering them back on the next day to avoid email alerts when the backend is down.

Is it possible to either disable the backend if the ACL conditions are met or to configure email alerts to accommodate this?

Thanks in advance!

2

This could be achieved using Lua. In Lua you can easily add custom fetches or actions. In your case it could be possible to add a fetch that checks if the current time is in the specific hours timerange. Also, starting with haproxy 2.9, haproxy emails alerts are implemented using Lua script, so the provided script can be customized to fit your needs (e.g.: don’t send emails during certain hours)