HAProxy has no server available!

• HAProxy failing at random times (backend has no server available!)
• HAProxy check says server is down when it is up
• Health checking

해당 서버가 구동중이지 않을 경우 문제가 발생한다.

Message from syslogd@localhost at Jun 29 16:01:33 ...
 haproxy[8372]: backend websocket_backend has no server available!

Message from syslogd@localhost at Jun 29 16:01:33 ...
 haproxy[8372]: backend websocket_backend has no server available!

Message from syslogd@localhost at Jun 29 16:01:34 ...
 haproxy[8372]: backend nodejs_flashpolicy has no server available!

Message from syslogd@localhost at Jun 29 16:01:34 ...
 haproxy[8372]: backend nodejs_flashpolicy has no server available!


tail -f /var/log/haproxy/haproxy*
==> /var/log/haproxy/haproxy.notice.log <==
Jun 29 16:01:33 localhost haproxy[8372]: Server websocket_backend/srv2 is DOWN, reason: Layer7 invalid response, check duration: 1ms. 0 active and 0 backup servers left. 0 sessions active, 0 requeued, 0 remaining in queue.
Jun 29 16:01:33 localhost haproxy[8372]: backend websocket_backend has no server available!