I run gmond predominently on windows hosts that mostly have
2 NICs. While many hosts have NIC teaming, many hosts do not,
and sometimes (semi-randomly) the src address for UDP data will
flick from one host IP to the other.
The effect of course on gmond and thence gmetad is that you get
2 XML entries for the host, 1 with the new IP, and with the old IP
which does not get updated, and will eventually be reported as down.
Depending on which XML entry comes last, one either does not notice
this,
or you get erroneous host down statuses.
So what is the best thing to do about this?
The pertinent code snippet in gmond.c is:
static Ganglia_host *
Ganglia_host_get( char *remoteip, apr_sockaddr_t *sa, Ganglia_message
*fullmsg)
{
apr_status_t status;
apr_pool_t *pool;
Ganglia_host *hostdata;
char *hostname = NULL;
if(!remoteip || !sa || !fullmsg)
{
return NULL;
}
hostdata = (Ganglia_host *)apr_hash_get( hosts, remoteip,
APR_HASH_KEY_STRING );
if(!hostdata)
{
/* Lookup the hostname or use the proxy information if available
*/
if( !hostname )
...
The hosts structure being keyed from the remoteip causes the problem.
Perhaps
if I keyed this hash with a hostname, and had a separate hash to
optimise the
ip -> hostname mapping, perhaps that will do?
I would appreciate guidance.
thanks,
Richard
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