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[DOC] document the "http-check disable-on-404" option

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Willy Tarreau 2007-11-30 12:29:11 +01:00
parent 2ea81930e7
commit dbc36f6e44
1 changed files with 30 additions and 9 deletions
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doc/configuration.txt
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@ -257,6 +257,7 @@ errorloc302 X X X X
errorloc303 X X X X
fullconn X - X X
grace - X X X
http-check disable-on-404 X - X X
log X X X X
maxconn X X X -
mode X X X X
@ -326,15 +327,6 @@ usesrc X - X X
----------------------+----------+----------+---------+---------
keyword defaults frontend listen backend
option contstats
By default, counters used for statistics calculation are incremented
only when a session finishes. It works quite well when serving small
objects, but with big ones (for example large images or archives) or
with A/V streaming, a graph generated from haproxy counters looks like
a hedgehog. With this option enabled counters get incremented continuously,
during a whole session. Recounting touches a hotpath directly so
it is not enabled by default, as it has small performance impact (~0.5%).
2.1) using ACLs
---------------
@ -682,3 +674,32 @@ and to every request on the "img", "video", "download" and "ftp" hosts :
use_backend www if host_www
See below for the detailed help on the "block" and "use_backend" keywords.
2.2) Options
------------
A handful of options affect the way the load balancing is performed or reaction
to state changes.
http-check disable-on-404
When this option is set, a server which returns an HTTP code 404 will be
excluded from further load-balancing, but will still receive persistent
connections. This provides a very convenient method for Web administrators
to perform a graceful shutdown of their servers. It is also important to note
that a server which is detected as failed while it was in this mode will not
generate an alert, just a notice. If the server responds 2xx or 3xx again, it
will immediately be reinserted into the farm. The status on the stats page
reports "NOLB" for a server in this mode. It is important to note that this
option only works in conjunction with the "httpchk" option.
option contstats
By default, counters used for statistics calculation are incremented
only when a session finishes. It works quite well when serving small
objects, but with big ones (for example large images or archives) or
with A/V streaming, a graph generated from haproxy counters looks like
a hedgehog. With this option enabled counters get incremented continuously,
during a whole session. Recounting touches a hotpath directly so
it is not enabled by default, as it has small performance impact (~0.5%).