Restore HAProxy stats

Question

I use following command to restart HAProxy, when changing the configurration file:

/usr/local/sbin/haproxy -f /etc/haproxy.cfg -p /var/run/haproxy.pid -sf $(</var/run/haproxy.pid)

Sadly after the HAProxy is back all stats of the previous launch are away.

Is there a possibility in HAProxy to restore stats from a previous HAProxy start?

Answer 1

As of version 1.6, you can dump server states into a flat file right before performing the reload and let the new process know where the states are stored. See example here:seamless_reload

The "show servers state" command is used to keep servers uptime and healthy status cross reload, but it doesn't give session data, or bytes in/out, etc. "show stat" command can dump these stats to a file that you can use to create a report later, although HAproxy doesn't have a feature to reload this information.

Answer 2

Can't be done unfortunately. HAProxy's stats are all in memory, so when restarting (even gracefully with -sf), those stats get lost.