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[MEDIUM] stats: add the "set maxconn" setting to the command line interface

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This option permits to change the global maxconn setting within the
limit that was set by the initial value, which is now reported as the
hard maxconn value. This allows to immediately accept more concurrent
connections or to stop accepting new ones until the value passes below
the indicated setting.

The main use of this option is on systems where many haproxy instances
are loaded and admins need to re-adjust resource sharing at run time
to regain a bit of fairness between processes.
This commit is contained in:
Willy Tarreau 2011-09-07 14:38:31 +02:00
parent abacc2cfd1
commit 91886b692a
3 changed files with 46 additions and 3 deletions
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8
doc/configuration.txt
View File

@ -9561,6 +9561,14 @@ set maxconn frontend <frontend> <value>
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 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
pending, they will immediately be accepted. If it is lowered to a value below
the current number of connections, new connections acceptation will be
delayed until the threshold is reached. A value of zero restores the initial
setting.
set timeout cli <delay>
Change the CLI interface timeout for current connection. This can be useful
during long debugging sessions where the user needs to constantly inspect

2
include/types/global.h
View File

@ -65,7 +65,7 @@ struct global {
int uid;
int gid;
int nbproc;
int maxconn;
int maxconn, hardmaxconn;
int maxpipes; /* max # of pipes */
int maxsock; /* max # of sockets */
int rlimit_nofile; /* default ulimit-n value : 0=unset */

39
src/dumpstats.c
View File

@ -1020,8 +1020,42 @@ static int stats_sock_parse_request(struct stream_interface *si, char *line)
return 1;
}
else if (strcmp(args[2], "global") == 0) {
int v;
if (s->listener->perm.ux.level < ACCESS_LVL_ADMIN) {
si->applet.ctx.cli.msg = stats_permission_denied_msg;
si->applet.st0 = STAT_CLI_PRINT;
return 1;
}
if (!*args[3]) {
si->applet.ctx.cli.msg = "Expects an integer value.\n";
si->applet.st0 = STAT_CLI_PRINT;
return 1;
}
v = atoi(args[3]);
if (v > global.hardmaxconn) {
si->applet.ctx.cli.msg = "Value out of range.\n";
si->applet.st0 = STAT_CLI_PRINT;
return 1;
}
/* check for unlimited values */
if (v <= 0)
v = global.hardmaxconn;
global.maxconn = v;
/* Dequeues all of the listeners waiting for a resource */
if (!LIST_ISEMPTY(&global_listener_queue))
dequeue_all_listeners(&global_listener_queue);
return 1;
}
else {
si->applet.ctx.cli.msg = "'set maxconn' only supports 'frontend'.\n";
si->applet.ctx.cli.msg = "'set maxconn' only supports 'frontend' and 'global'.\n";
si->applet.st0 = STAT_CLI_PRINT;
return 1;
}
@ -1393,6 +1427,7 @@ static int stats_dump_raw_to_buffer(struct stream_interface *si)
"Ulimit-n: %d\n"
"Maxsock: %d\n"
"Maxconn: %d\n"
"Hard_maxconn: %d\n"
"Maxpipes: %d\n"
"CurrConns: %d\n"
"PipesUsed: %d\n"
@ -1409,7 +1444,7 @@ static int stats_dump_raw_to_buffer(struct stream_interface *si)
up,
global.rlimit_memmax,
global.rlimit_nofile,
global.maxsock, global.maxconn, global.maxpipes,
global.maxsock, global.maxconn, global.hardmaxconn, global.maxpipes,
actconn, pipes_used, pipes_free,
nb_tasks_cur, run_queue_cur,
global.node, global.desc?global.desc:""