Hi Willy, Malcolm has asked me to open a discussion with you regarding adding email alerts to haproxy and that is the purpose of this email.
In essence the motivation is to provide a lightweight email alert feature that may be used in situations where a full-blown monitoring system is not in use. There is some discussion of this topic and several solutions, including patches to haproxy, on the loadbalancer.org log. http://blog.loadbalancer.org/3-ways-to-send-haproxy-health-check-email-alerts/ Would you be open to including such a feature in haproxy? If so I had it in mind to have haproxy send emails using the sendmail command, a variation of the mailx implementation at the link above, avoiding the need to implement an SMTP client. I was thinking it could be configured using directives like the following, borrowing ideas from my recent external-agent patch. global email-alert listen ... option email-alert email-alert command sendmail email-alert path /usr/sbin:/usr/lib email-alert from from@x.y.z email-alert to to@x.y.z email-alert cc cc1@x.y.z, cc2@x.y.z email-alert bcc bcc@x.y.z email-alert subject Loadbalancer alert email-alert custom-header X-Custom: foo It might be nice to allow the use of printf style directives in the subject to allow it to include the name of the proxy and other useful information. I expect that different users have different needs there.
