On 9/18/05, Ashley Wright <[EMAIL PROTECTED]> wrote: > We would like to be able to take a snapshot of a graph. ie Once a week > we would like to save some of the graphs and store them, so we can > easily compare weeks, put them in reports etc. > > Does anybody know of a easy way or a tool which can take snapshots of > the graph?. I have had a look at the xml output but it is only the > current information, not the historical.
There is probably a way that is 10 to 20 times easier, but one way of doing this would be to e.g. issue a anacron or cron job that fetches the graphs from the web interface. I don't know how you'd come up with a name, though; maybe some sort of script would get the current time and generate a filename, and then fetch the file and place it where it needs to go. Here are some examples, below, but note that they're not stress tested, nor are they "clean" -- so a professional could probably come up with some better code... e.g. crontab: (see man 5 crontab for info on format) #(fetches at midnight every sunday...) @weekly fetch-ganglia-graphs.pl #(ditto) 0 0 * * 0 fetch-ganglia-graphs.pl #(noon on sundays) 0 12 * * 0 fetch-ganglia-graphs.pl e.g. anacrontab: #(about seven days) 7 0 fetchgangliagraphs fetch-ganglia-graphs.pl === fetch-ganglia-graphs.pl === #!/usr/bin/perl ### fetch-ganglia-graphs.pl ### Note, this script assumes the folder seperator is "/"... # Load Modules use Time::Localtime; use IO::File; use IO::Handle; use LWP::Simple; use URI::Escape; # Config # Base folder where to store graphs $graphsoutfolder = "/var/www/graphsarchive"; # URI where graph.php from the Ganglia Web Frontend can be found $baseuri = 'http://localhost/ganglia/'; # Types of report to fetch @reporttypes = ('load_report','cpu_report'); # Graph Size ('large', 'medium', 'small') $size = 'large'; # Cluster Name $clustername = uri_escape('SGS Main'); # Type of Graph to fetch, e.g. 'week' or 'hour' $r = 'week'; # I have no clue what this is; just copy it from a image url from the Ganglia frontend - can someone explain? $hc = '4'; #Set Up $st = time(); $yday = localtime->yday(); $year = localtime->year(); $weekno = ($yday-($yday%7))/7); if (!(-d $graphsoutfolder)) { if (mkdir($graphsoutfolder)) { #okay, we created the graphs folder }else{ die "$graphsoutfolder doesn\'t exist and we couldn\'t create it"; } } # Get File if (-d $graphsoutfolder."/".$year."-".$weekno) { warn "Output folder for this year and week already exist }else{ if (mkdir($graphsoutfolder."/".$year."-".$weekno)) { #okay, we got the folder for this week }else{ die "Couldn\'t make the folder for this week"; } } foreach $report (@reporttypes) { my $filename = $graphsoutfolder."/".$year."-".$weekno."/".$report.".gif"; my $fh = IO::File->new($filename,'w') or die "Can\'t make the file for $report."; my $url = $baseuri.'graph.php?g='.$report.'&z='.$size.'&c='.$clustername.'&m=&r='.$r.'&s=descending&hc='.$hc.'&st='.$st; my $content = get($url); print $fh $content; } === end file === Someone more experienced with Ganglia have a better solution? -- ~Mike - Just my two cents - No man is an island, and no man is unable.
