MINOR: cli: ability to set per-server maxconn
This commit adds support for setting a per-server maxconn from the stats
socket. The only really notable part of this commit is that we need to
check if maxconn == minconn before changing things, as this indicates
that we are NOT using dynamic maxconn. When we are not using dynamic
maxconn, we should update maxconn/minconn in lockstep.
diff --git a/doc/management.txt b/doc/management.txt
index d67988b..a53a953 100644
--- a/doc/management.txt
+++ b/doc/management.txt
@@ -1356,6 +1356,11 @@
delayed until the threshold is reached. The frontend might be specified by
either its name or its numeric ID prefixed with a sharp ('#').
+set maxconn server <backend/server> <value>
+ Dynamically change the specified server's maxconn setting. Any positive
+ value is allowed including zero, but setting values larger than the global
+ maxconn does not make much sense.
+
set maxconn global <maxconn>
Dynamically change the global maxconn setting within the range defined by the
initial global maxconn setting. If it is increased and connections were
diff --git a/src/dumpstats.c b/src/dumpstats.c
index e80e45c..b83dfb8 100644
--- a/src/dumpstats.c
+++ b/src/dumpstats.c
@@ -1646,6 +1646,38 @@
return 1;
}
+ else if (strcmp(args[2], "server") == 0) {
+ struct server *sv;
+ int v;
+
+ sv = expect_server_admin(s, si, args[3]);
+ if (!sv)
+ return 1;
+
+ if (!*args[4]) {
+ appctx->ctx.cli.msg = "Integer value expected.\n";
+ appctx->st0 = STAT_CLI_PRINT;
+ return 1;
+ }
+
+ v = atoi(args[4]);
+ if (v < 0) {
+ appctx->ctx.cli.msg = "Value out of range.\n";
+ appctx->st0 = STAT_CLI_PRINT;
+ return 1;
+ }
+
+ if (sv->maxconn == sv->minconn) { // static maxconn
+ sv->maxconn = sv->minconn = v;
+ } else { // dynamic maxconn
+ sv->maxconn = v;
+ }
+
+ if (may_dequeue_tasks(sv, sv->proxy))
+ process_srv_queue(sv);
+
+ return 1;
+ }
else if (strcmp(args[2], "global") == 0) {
int v;
@@ -1681,7 +1713,7 @@
return 1;
}
else {
- appctx->ctx.cli.msg = "'set maxconn' only supports 'frontend' and 'global'.\n";
+ appctx->ctx.cli.msg = "'set maxconn' only supports 'frontend', 'server', and 'global'.\n";
appctx->st0 = STAT_CLI_PRINT;
return 1;
}