Document the "ignore-persist" option.
--
Cyril Bonté
--- haproxy-1.4.4/doc/configuration.txt 2010-04-07 23:12:24.000000000 +0200
+++ haproxy-1.4.4-persist/doc/configuration.txt 2010-04-25 22:18:46.000000000 +0200
@@ -836,6 +836,7 @@
option httpclose (*) X X X X
option httplog X X X X
option http_proxy (*) X X X X
+option ignore-persist - X X X
option independant-streams (*) X X X X
option log-health-checks (*) X - X X
option log-separate-errors (*) X X X -
@@ -1003,7 +1004,8 @@
Example :
appsession JSESSIONID len 52 timeout 3h
- See also : "cookie", "capture cookie", "balance", "stick" and "stick-table".
+ See also : "cookie", "capture cookie", "balance", "stick", "stick-table"
+ and "option ignore-persist"
backlog <conns>
@@ -1700,7 +1702,8 @@
cookie SRV insert indirect nocache
cookie SRV insert postonly indirect
- See also : "appsession", "balance source", "capture cookie", "server".
+ See also : "appsession", "balance source", "capture cookie", "server"
+ and "option ignore-persist".
default-server [param*]
@@ -1895,7 +1898,8 @@
"unless" condition is met. The final redispatch is always disabled when this
is used.
- See also : "option redispatch", "persist", and section 7 about ACL usage.
+ See also : "option redispatch", "option ignore-persist", "persist",
+ and section 7 about ACL usage.
fullconn <conns>
@@ -2950,6 +2954,30 @@
See also : "option httpclose"
+option ignore-persist { if | unless } <condition>
+ Declare a condition to ignore persistence
+ May be used in sections: defaults | frontend | listen | backend
+ no | yes | yes | yes
+
+ By default, when cookie persistence is enabled, every requests containing
+ the cookie are unconditionally persistent (assuming the target server is up
+ and running).
+
+ The "ignore-persist" statement allows one to declare various ACL-based
+ conditions which, when met, will cause a request to ignore persistence.
+ This is sometimes useful to load balance requests for static files, which
+ oftenly don't require persistence. This can also be used to fully disable
+ persistence for a specific User-Agent (for example, some web crawler bots).
+
+ Combined with "appsession", it can also help reduce HAProxy memory usage, as
+ the appsession table won't grow if persistence is ignored.
+
+ The persistence is ignored when an "if" condition is met, or unless an
+ "unless" condition is met.
+
+ See also : "option force-persist", "cookie", and section 7 about ACL usage.
+
+
option independant-streams
no option independant-streams
Enable or disable independant timeout processing for both directions
@@ -7303,7 +7331,8 @@
I : the client provided an INVALID cookie matching no known server.
This might be caused by a recent configuration change, mixed
- cookies between HTTP/HTTPS sites, or an attack.
+ cookies between HTTP/HTTPS sites, persistence conditionally
+ ignored, or an attack.
D : the client provided a cookie designating a server which was DOWN,
so either "option persist" was used and the client was sent to
