Hi list,
while upgrading to Nagios v3 I have run into phantom circular host
dependencies (i.e. host A depends on host C, host B depends on host C,
nagios reports a circular dependency). Tracing the unexpected behaviour
has lead to this code in base/config.c (ll 2493-2501 in HEAD):
/* find the dependent host */
temp_host=find_host(temp_hd->dependent_host_name);
if(temp_host==NULL){
logit(NSLOG_VERIFICATION_ERROR,TRUE,"Error: Dependent host specified in host dependency for host '%s' is not defined anywhere!",temp_hd->dependent_host_name);
errors++;
}
/* save pointer for later */
temp_hd->dependent_host_ptr=temp_host2;
You see that the looked up host is assigned to "temp_host" but saved for
later use in the dependency detection code is "temp_host2", which has
more or less random content at this time.
Applying the following patch has restored the expected behaviour for me:
--- nagios-cvs/base/config.c.orig 2008-04-03 15:35:31.000000000 +0200
+++ nagios-cvs/base/config.c 2008-04-03 15:35:34.000000000 +0200
@@ -2498,7 +2498,7 @@
}
/* save pointer for later */
- temp_hd->dependent_host_ptr=temp_host2;
+ temp_hd->dependent_host_ptr=temp_host;
/* find the host we're depending on */
temp_host2=find_host(temp_hd->host_name);
Sincerely,
Ralph Rößner
--
Ralph Rößner
CAPCom AG
Rundeturmstr. 10, 64283 Darmstadt, Germany
Phone +49 6151 155 900, Fax +49 6151 155 909
Vorstand: Luc Neumann (Vorsitzender)
Vorsitzender des Aufsichtsrats: Prof. Dr.-Ing. José L. Encarnação
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