Ron, Thanks, this is what we need. In case we decide not to count rrd files, is there equivalent code to the following to count all hosts in a single cluster? #print_r($grid); $mygrid=array_shift($grid); print "<br>".$mygrid["NAME"]."<br>"; $x=($mygrid["HOSTS_UP"] + $mygrid["HOSTS_DOWN"]); print $x;
Something like $grid[$cluster] ? thanks, Ron ________________________________ From: Ron Wellnitz [mailto:[email protected]] Sent: Tuesday, May 04, 2010 1:57 AM To: Bennett, Ron Cc: [email protected] Subject: Re: [Ganglia-general] counting all hosts Hi Ron, one possibility in php is test.php: <?php include_once "./conf.php"; include_once "./get_context.php"; include_once "./functions.php"; include_once "./ganglia.php"; include_once "./get_ganglia.php"; Gmetad(); #print_r($grid); $mygrid=array_shift($grid); print "<br>".$mygrid["NAME"]."<br>"; $x=($mygrid["HOSTS_UP"] + $mygrid["HOSTS_DOWN"]); print $x; ?> if you are already in a "orginal" ganglia php script, you do not need the "include"-lines. when a host is down and you restart the gmetad daemon, this down host will not be longer recognize by ganglia ! so it can be usefull to write a little script (php/ksh), which count the number of a uniqe rrd file ... something like this: $base="/var/lib/ganglia/rrds"; $hosts=0; foreach (glob("${base}/*/*/cpu_idle.rrd") as $filepath) { $array = split("/",$filepath); $x = count($array); $server = $array[$x-2]; $cluster = $array[$x-3]; if ( $server != "__SummaryInfo__" && $cluster != "__SummaryInfo__" ) { $hosts++; } } } if you need to seperate between up and down, you can check the last update of an rrd file $cmd = "/usr/bin/rrdtool lastupdate $filepath 2>/dev/null"; $last_line = exec($cmd, $dummy, $retval); if ( $retval == 0 ) { $content = split(":",$last_line); $timestamp = $content[0]; $idle = $content[1]; $diff = time() - $timestamp; if ( $diff >= 120 ) { #offline;} else {#online;} } greets Ron Am 03.05.2010 20:09, schrieb Bennett, Ron: The sample PHP code contains instructions like the following to count nodes for computing averages: $series = "DEF:'num_nodes'='${rrd_dir}/cpu_user.rrd':'num':AVERAGE " . "DEF:'cpu_user'='${rrd_dir}/cpu_user.rrd':'sum':AVERAGE " . "CDEF:'ccpu_user'=cpu_user,num_nodes,/ " This method appears to count "HOSTS UP" as the number of nodes. For a new gmetric, we need to be able to count total hosts (UP and DOWN), not just UP. Is there a recommended method in PHP for getting the total number of nodes (UP plus DOWN)? Thanks, Ron ------------------------------------------------------------------------ ------ _______________________________________________ Ganglia-general mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/ganglia-general
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