[MEDIUM] add a maintenance mode to servers
This is a first attempt to add a maintenance mode on servers, using
the stat socket (in admin level).
It can be done with the following command :
- disable server <backend>/<server>
- enable server <backend>/<server>
In this mode, no more checks will be performed on the server and it
will be marked as a special DOWN state (MAINT).
If some servers were tracking it, they'll go DOWN until the server
leaves the maintenance mode. The stats page and the CSV export also
display this special state.
This can be used to disable the server in haproxy before doing some
operations on this server itself. This is a good complement to the
"http-check disable-on-404" keyword and works in TCP mode.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 48c90c7..ccb7e1c 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -7656,6 +7656,28 @@
server. This has the same effect as restarting. This command is restricted
and can only be issued on sockets configured for level "admin".
+disable server <backend>/<server>
+ Mark the server DOWN for maintenance. In this mode, no more checks will be
+ performed on the server until it leaves maintenance.
+ If the server is tracked by other servers, those servers will be set to DOWN
+ during the maintenance.
+
+ Both the backend and the server may be specified either by their name or by
+ their numeric ID, prefixed with a dash ('#').
+
+ This command is restricted and can only be issued on sockets configured for
+ level "admin".
+
+enable server <backend>/<server>
+ If the server was previously marked as DOWN for maintenance, this marks the
+ server UP and checks are re-enabled.
+
+ Both the backend and the server may be specified either by their name or by
+ their numeric ID, prefixed with a dash ('#').
+
+ This command is restricted and can only be issued on sockets configured for
+ level "admin".
+
get weight <backend>/<server>
Report the current weight and the initial weight of server <server> in
backend <backend> or an error if either doesn't exist. The initial weight is