Hi, On Tue, Jun 27, Velmurugan Dhakshnamoorthy wrote: > The HAProxy 1.6.12 has been implemented on Red Hat Linux 7.2(3.10) and we > have set the maxconn to 100 in listen block(front-end). Our objective is to > queue connections more than 100 into linux kernel syn log until the > established connection are freed. > > while user connections > 100 in queue, we would like to display some kind > of custom browser message to end users, so that they will know if slowness > is due to heavy traffic and intentional, is there any way to display custom > message while connections are queued.
Hmm, I don't think you can send custom message if the client's connection is waiting for kernel syn... ? But perhaps you can use minconn/maxconn/fullconn/timeout queue and queue/avg_queue: https://cbonte.github.io/haproxy-dconv/1.6/configuration.html#4.2-maxconn https://cbonte.github.io/haproxy-dconv/1.6/configuration.html#fullconn https://cbonte.github.io/haproxy-dconv/1.6/configuration.html#timeout%20queue https://cbonte.github.io/haproxy-dconv/1.6/configuration.html#avg_queue https://cbonte.github.io/haproxy-dconv/1.6/configuration.html#queue So something like this(untested): frontend ... errorfile 200 /path/to/your_queuefull.html acl queue_full queue(your_backend) gt 100 http-request deny deny_status 200 if queue_full # or instead of http-request deny #use_backend BE_queuefull if queue_full # and BE_queuefull has custom 503 errorfile containing custom message. -Jarno -- Jarno Huuskonen - System Administrator | jarno.huuskonen atsign uef.fi
