Re: Reuse backend connections
Bryan, One another follow-up question - what does persist do? Thanks! -Leela From: Bryan Talbot Date: Friday, June 29, 2018 at 12:40 PM To: "Leela Kalidindi (lkalidin)" Cc: HAproxy Mailing Lists Subject: Re: Reuse backend connections On Jun 29, 2018, at Jun 29, 12:38 PM, Leela Kalidindi (lkalidin) mailto:lkali...@cisco.com>> wrote: Hi Bryan, Thanks a lot for the prompt response. Is there a such kind of thing to leave the backend connections open forever that can serve any client request? No, not to my knowledge. -Bryan
Re: Reuse backend connections
Hi Bryan,
Thanks a lot for the prompt response.
Is there a such kind of thing to leave the backend connections open forever
that can serve any client request?
-Leela
From: Bryan Talbot
Date: Friday, June 29, 2018 at 12:30 PM
To: "Leela Kalidindi (lkalidin)"
Cc: HAproxy Mailing Lists
Subject: Re: Reuse backend connections
On Jun 29, 2018, at Jun 29, 5:11 AM, Leela Kalidindi (lkalidin)
mailto:lkali...@cisco.com>> wrote:
Hi,
How can I enforce haproxy to reuse limited backend connections regardless of
number of client connections? Basically I do not want to recreate backend
connection for every front end client.
"HAPROXY_0_BACKEND_HEAD": "\nbackend {backend}\n balance {balance}\n mode
http\n option httplog\n option forwardfor\n option http-keep-alive\n option
persist\n http-reuse aggressive\n maxconn 16\n",
"HAPROXY_0_FRONTEND_HEAD": "\nfrontend {backend}\n bind
{bindAddr}:{servicePort}\n mode http\n option httplog\n option forwardfor\n
option http-keep-alive\n maxconn 16\n"
I currently have the above configuration, but still backend connections are
getting closed when the next client request comes in.
Could someone help me with the issue? Thanks in advance!
I suspect that there is a misunderstanding of what backend connection re-use
means. Specifically this portion from the documentation seems to trip people up:
https://cbonte.github.io/haproxy-dconv/1.8/configuration.html#http-reuse
No connection pool is involved, once a session dies, the last idle connection
it was attached to is deleted at the same time. This ensures that connections
may not last after all sessions are closed.
I suspect that in your testing, you send one request, observe TCP state, then
send a second request and expect the second request to use the same TCP
connection. This is not how the feature works. The feature is optimized to
support busy / loaded servers where the TCP open rate should be minimized. This
allows a server to avoid, say opening 2,000 new connections per second, and
instead just keep re-using a handful. It’s not a connection pool that pre-opens
10 connections and keeps them around in case they might be needed.
-Bryan
Re: Reuse backend connections
Not for Remote desktop protocol, it is for haproxy backend server with option
persist as in
"HAPROXY_0_BACKEND_HEAD": "\nbackend {backend}\n balance {balance}\n mode
http\n option httplog\n option forwardfor\n option http-keep-alive\n option
persist\n http-reuse aggressive\n maxconn 16\n",
Thanks!
From: Bryan Talbot
Date: Friday, June 29, 2018 at 12:47 PM
To: "Leela Kalidindi (lkalidin)"
Cc: HAproxy Mailing Lists
Subject: Re: Reuse backend connections
On Jun 29, 2018, at Jun 29, 12:42 PM, Leela Kalidindi (lkalidin)
mailto:lkali...@cisco.com>> wrote:
Bryan,
One another follow-up question - what does persist do? Thanks!
https://cbonte.github.io/haproxy-dconv/1.8/configuration.html#persist
is for
https://en.wikipedia.org/wiki/Remote_Desktop_Protocol
Is that what you were asking?
-Bryan
reuse backend connections
Hi,
How can I enforce haproxy to reuse limited backend connections regardless of
number of client connections? Basically I do not want to recreate backend
connection for every front end client.
"HAPROXY_0_BACKEND_HEAD": "\nbackend {backend}\n balance {balance}\n mode
http\n option httplog\n option forwardfor\n option http-keep-alive\n option
persist\n http-reuse aggressive\n maxconn 16\n",
"HAPROXY_0_FRONTEND_HEAD": "\nfrontend {backend}\n bind
{bindAddr}:{servicePort}\n mode http\n option httplog\n option forwardfor\n
option http-keep-alive\n maxconn 16\n"
I currently configured the above options, but still backend connections are
closed after the original client requests is processed.
Please kindly treat this as urgent. Thanks in advance!
-Leela
Reuse backend connections
Hi,
How can I enforce haproxy to reuse limited backend connections regardless of
number of client connections? Basically I do not want to recreate backend
connection for every front end client.
"HAPROXY_0_BACKEND_HEAD": "\nbackend {backend}\n balance {balance}\n mode
http\n option httplog\n option forwardfor\n option http-keep-alive\n option
persist\n http-reuse aggressive\n maxconn 16\n",
"HAPROXY_0_FRONTEND_HEAD": "\nfrontend {backend}\n bind
{bindAddr}:{servicePort}\n mode http\n option httplog\n option forwardfor\n
option http-keep-alive\n maxconn 16\n"
I currently have the above configuration, but still backend connections are
getting closed when the next client request comes in.
Could someone help me with the issue? Thanks in advance!
-Leela
