When IP_VS schedulers do not find a destination, they output a terse
"WLC: no destination available" message through kernel syslog, which I
can not only make sense of because syslog puts them in a logfile
together with keepalived checker results.
This patch makes the output a bit more informative, by telling you which
virtual service failed to find a destination.
Example output:
kernel: [1539214.552233] IPVS: wlc: TCP 192.168.8.30:22 - no destination
available
kernel: [1539299.674418] IPVS: wlc: FWM 22 0x00000016 - no destination
available
I have tested the code for IPv4 and FWM services, as you can see from
the example; I do not have an IPv6 setup to test the third code path
with.
To avoid code duplication, I put a new function ip_vs_scheduler_err()
into ip_vs_sched.c, and use that from the schedulers instead of calling
IP_VS_ERR_RL directly.
The patch is against 2.6.36.2, as that's what I have running. It still
applies with two hunks shifted to 2.6.38-rc4, and builds there without
warnings.
Please review and consider for inclusion in upcoming kernels.
best regards
Patrick
diff -pur -X patch.exclude linux-2.6.36.2/include/net/ip_vs.h linux-2.6.36.2-bof/include/net/ip_vs.h
--- linux-2.6.36.2/include/net/ip_vs.h 2010-12-14 14:22:48.826000001 +0100
+++ linux-2.6.36.2-bof/include/net/ip_vs.h 2011-02-11 12:27:54.301006127 +0100
@@ -789,6 +789,7 @@ ip_vs_schedule(struct ip_vs_service *svc
extern int ip_vs_leave(struct ip_vs_service *svc, struct sk_buff *skb,
struct ip_vs_protocol *pp);
+extern void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg);
/*
* IPVS control data and functions (from ip_vs_ctl.c)
diff -pur -X patch.exclude linux-2.6.36.2/net/netfilter/ipvs/ip_vs_lblc.c linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_lblc.c
--- linux-2.6.36.2/net/netfilter/ipvs/ip_vs_lblc.c 2010-12-14 14:20:14.681000001 +0100
+++ linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_lblc.c 2011-02-11 12:28:42.143528395 +0100
@@ -511,7 +511,7 @@ ip_vs_lblc_schedule(struct ip_vs_service
/* No cache entry or it is invalid, time to schedule */
dest = __ip_vs_lblc_schedule(svc);
if (!dest) {
- IP_VS_ERR_RL("LBLC: no destination available\n");
+ ip_vs_scheduler_err(svc, "no destination available");
return NULL;
}
diff -pur -X patch.exclude linux-2.6.36.2/net/netfilter/ipvs/ip_vs_lblcr.c linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_lblcr.c
--- linux-2.6.36.2/net/netfilter/ipvs/ip_vs_lblcr.c 2010-12-14 14:20:14.517000000 +0100
+++ linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_lblcr.c 2011-02-11 12:28:42.138528548 +0100
@@ -694,7 +694,7 @@ ip_vs_lblcr_schedule(struct ip_vs_servic
/* The cache entry is invalid, time to schedule */
dest = __ip_vs_lblcr_schedule(svc);
if (!dest) {
- IP_VS_ERR_RL("LBLCR: no destination available\n");
+ ip_vs_scheduler_err(svc, "no destination available");
read_unlock(&svc->sched_lock);
return NULL;
}
diff -pur -X patch.exclude linux-2.6.36.2/net/netfilter/ipvs/ip_vs_lc.c linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_lc.c
--- linux-2.6.36.2/net/netfilter/ipvs/ip_vs_lc.c 2010-12-14 14:20:14.100000002 +0100
+++ linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_lc.c 2011-02-11 12:28:42.133528703 +0100
@@ -70,7 +70,7 @@ ip_vs_lc_schedule(struct ip_vs_service *
}
if (!least)
- IP_VS_ERR_RL("LC: no destination available\n");
+ ip_vs_scheduler_err(svc, "no destination available");
else
IP_VS_DBG_BUF(6, "LC: server %s:%u activeconns %d "
"inactconns %d\n",
diff -pur -X patch.exclude linux-2.6.36.2/net/netfilter/ipvs/ip_vs_nq.c linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_nq.c
--- linux-2.6.36.2/net/netfilter/ipvs/ip_vs_nq.c 2010-12-14 14:20:14.134000002 +0100
+++ linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_nq.c 2011-02-11 12:28:42.131528765 +0100
@@ -99,7 +99,7 @@ ip_vs_nq_schedule(struct ip_vs_service *
}
if (!least) {
- IP_VS_ERR_RL("NQ: no destination available\n");
+ ip_vs_scheduler_err(svc, "no destination available");
return NULL;
}
diff -pur -X patch.exclude linux-2.6.36.2/net/netfilter/ipvs/ip_vs_rr.c linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_rr.c
--- linux-2.6.36.2/net/netfilter/ipvs/ip_vs_rr.c 2010-12-14 14:20:14.347000001 +0100
+++ linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_rr.c 2011-02-11 12:28:42.145528333 +0100
@@ -72,7 +72,7 @@ ip_vs_rr_schedule(struct ip_vs_service *
q = q->next;
} while (q != p);
write_unlock(&svc->sched_lock);
- IP_VS_ERR_RL("RR: no destination available\n");
+ ip_vs_scheduler_err(svc, "no destination available");
return NULL;
out:
diff -pur -X patch.exclude linux-2.6.36.2/net/netfilter/ipvs/ip_vs_sched.c linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_sched.c
--- linux-2.6.36.2/net/netfilter/ipvs/ip_vs_sched.c 2010-12-14 14:20:14.210000002 +0100
+++ linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_sched.c 2011-02-11 13:27:02.845477196 +0100
@@ -29,6 +29,7 @@
#include <net/ip_vs.h>
+EXPORT_SYMBOL(ip_vs_scheduler_err);
/*
* IPVS scheduler list
*/
@@ -163,6 +164,33 @@ void ip_vs_scheduler_put(struct ip_vs_sc
module_put(scheduler->module);
}
+/*
+ * Common error output helper for schedulers
+ */
+
+void ip_vs_scheduler_err(struct ip_vs_service *svc, const char *msg)
+{
+ if (svc->fwmark) {
+ IP_VS_ERR_RL("%s: FWM %u 0x%08X - %s\n",
+ svc->scheduler->name, svc->fwmark, svc->fwmark, msg);
+ return;
+ }
+#ifdef CONFIG_IP_VS_IPV6
+ if (svc->af == AF_INET6) {
+ IP_VS_ERR_RL("%s: %s [%pI6]:%d - %s\n",
+ svc->scheduler->name,
+ ip_vs_proto_name(svc->protocol),
+ &svc->addr.in6, ntohs(svc->port),
+ msg);
+ return;
+ }
+#endif
+ IP_VS_ERR_RL("%s: %s %pI4:%d - %s\n",
+ svc->scheduler->name,
+ ip_vs_proto_name(svc->protocol),
+ &svc->addr.ip, ntohs(svc->port),
+ msg);
+}
/*
* Register a scheduler in the scheduler list
diff -pur -X patch.exclude linux-2.6.36.2/net/netfilter/ipvs/ip_vs_sed.c linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_sed.c
--- linux-2.6.36.2/net/netfilter/ipvs/ip_vs_sed.c 2010-12-14 14:20:14.182000001 +0100
+++ linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_sed.c 2011-02-11 12:28:42.128528858 +0100
@@ -87,7 +87,7 @@ ip_vs_sed_schedule(struct ip_vs_service
goto nextstage;
}
}
- IP_VS_ERR_RL("SED: no destination available\n");
+ ip_vs_scheduler_err(svc, "no destination available");
return NULL;
/*
diff -pur -X patch.exclude linux-2.6.36.2/net/netfilter/ipvs/ip_vs_sh.c linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_sh.c
--- linux-2.6.36.2/net/netfilter/ipvs/ip_vs_sh.c 2010-12-14 14:20:14.530000000 +0100
+++ linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_sh.c 2011-02-11 12:28:42.125528949 +0100
@@ -223,7 +223,7 @@ ip_vs_sh_schedule(struct ip_vs_service *
|| !(dest->flags & IP_VS_DEST_F_AVAILABLE)
|| atomic_read(&dest->weight) <= 0
|| is_overloaded(dest)) {
- IP_VS_ERR_RL("SH: no destination available\n");
+ ip_vs_scheduler_err(svc, "no destination available");
return NULL;
}
diff -pur -X patch.exclude linux-2.6.36.2/net/netfilter/ipvs/ip_vs_wlc.c linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_wlc.c
--- linux-2.6.36.2/net/netfilter/ipvs/ip_vs_wlc.c 2010-12-14 14:20:14.256000001 +0100
+++ linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_wlc.c 2011-02-11 12:28:42.148528240 +0100
@@ -75,7 +75,7 @@ ip_vs_wlc_schedule(struct ip_vs_service
goto nextstage;
}
}
- IP_VS_ERR_RL("WLC: no destination available\n");
+ ip_vs_scheduler_err(svc, "no destination available");
return NULL;
/*
diff -pur -X patch.exclude linux-2.6.36.2/net/netfilter/ipvs/ip_vs_wrr.c linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_wrr.c
--- linux-2.6.36.2/net/netfilter/ipvs/ip_vs_wrr.c 2010-12-14 14:20:14.180000001 +0100
+++ linux-2.6.36.2-bof/net/netfilter/ipvs/ip_vs_wrr.c 2011-02-11 12:28:42.151528147 +0100
@@ -147,8 +147,9 @@ ip_vs_wrr_schedule(struct ip_vs_service
if (mark->cl == mark->cl->next) {
/* no dest entry */
- IP_VS_ERR_RL("WRR: no destination available: "
- "no destinations present\n");
+ ip_vs_scheduler_err(svc,
+ "no destination available: "
+ "no destinations present");
dest = NULL;
goto out;
}
@@ -162,8 +163,8 @@ ip_vs_wrr_schedule(struct ip_vs_service
*/
if (mark->cw == 0) {
mark->cl = &svc->destinations;
- IP_VS_ERR_RL("WRR: no destination "
- "available\n");
+ ip_vs_scheduler_err(svc,
+ "no destination available");
dest = NULL;
goto out;
}
@@ -185,8 +186,9 @@ ip_vs_wrr_schedule(struct ip_vs_service
/* back to the start, and no dest is found.
It is only possible when all dests are OVERLOADED */
dest = NULL;
- IP_VS_ERR_RL("WRR: no destination available: "
- "all destinations are overloaded\n");
+ ip_vs_scheduler_err(svc,
+ "no destination available: "
+ "all destinations are overloaded");
goto out;
}
}
