Tomas, I have at least your problems #1 and #2, and found fixes for both:
After installing ganglia and php 7.2 (for me, on Ubuntu 20) as described in https://websiteforstudents.com/how-to-install-ganglia-monitoring-server-on-ubuntu-18-04-16-04/ <https://websiteforstudents.com/how-to-install-ganglia-monitoring-server-on-ubuntu-18-04-16-04/> I found that the main cluster view was *blank*, with just the UI buttons but no individual hosts nor any cluster-aggregate graphs. But the "physical view" button did work, and so did the menu choosing individual hosts in the cluster -- the per-host display looked normal, fully populated with the expected graphs. The web server error log had a clue: Mon Dec 28 12:27:38.491219 2020] [php7:error] ... PHP Fatal error: Uncaught Error: [] operator not supported for strings in /usr/share/ganglia-webfrontend/cluster_view.php:34\nStack trace:\n#0 /usr/share/ganglia-webfrontend/cluster_view.php(757): get_picker_metrics(Array, Array, '/usr/share/gang...', 'rrdtool')\n#1 /usr/share/ganglia-webfrontend/index.php(51): include_once('/usr/share/gang...')\n#2 {main}\n thrown in /usr/share/ganglia-webfrontend/cluster_view.php on line 34 It turned out that cluster_view.php initialized a variable as a string, then assigned to it as an array, like $context_metrics = ""; [...] $context_metrics[] = $report_name; Thanks to this stackoverflow thread <https://stackoverflow.com/questions/5879675/fatal-error-operator-not-supported-for-strings> for explaining that this used to work in php5, but doesn't in php 7.1 and later. This patch fixed it: --- cluster_view.php.ORIG 2014-04-04 05:20:44.000000000 -0500 +++ cluster_view.php 2020-12-28 18:52:47.936940947 -0600 @@ -23,7 +23,7 @@ } function get_picker_metrics($metrics, $reports, $gweb_root, $graph_engine) { - $context_metrics = ""; + $context_metrics = []; // for php 7.1+ we must initialize this to an array for $var[] = ... assignment to work. Thanks to: https://stackoverflow.com/questions/5879675/fatal-error-operator-not-supported-for-strings if (count($metrics)) { foreach ($metrics as $host_metrics) { foreach ($host_metrics as $metric_name => $metric_value) { Also, the Ubuntu ganglia package didn't contain /var/lib/ganglia/conf/*.json configuration entries. I copied those from another ganglia installation (part of the Rocks 6 cluster distribution). They might be helpful as examples. /var/lib/ganglia/conf/default.json contains: { "included_reports": ["load_report","mem_report","cpu_report","network_report"] } /var/lib/ganglia/conf/view_default.json contains: {"view_name":"default","items":[],"view_type":"standard"} On 5/23/20 7:08 AM, Tomas Aronsson wrote: > Hi! > > My name is Tomas! Just installed ganglia a week ago to monitor my > little raspberry pi cluster. I have three issues: > 1) I cannot see any cluster summary graphs, only the host-specific > ones are populated. Is this normal? How can I see the summary graphs? > Summary empty: https://emyro.se/ganglia_fail1.PNG > <https://emyro.se/ganglia_fail1.PNG> > Specific host not empty: https://emyro.se/ganglia_fail2.PNG > <https://emyro.se/ganglia_fail2.PNG> > > 2) The hostnames are just IP addresses. Is there anyway to get the > hostname? For the hosts I've set the hostname, but only the IP show up? > https://emyro.se/ganglia_fail3.PNG <https://emyro.se/ganglia_fail3.PNG> > > 3) I get some very strange readings from the raspberry pi hosts. It > says network traffic is spiking at PB/s (lol!) eventhough it's more > like MB/s. Any ideas? > https://emyro.se/ganglia_fail4.PNG <https://emyro.se/ganglia_fail4.PNG> > > Any help is greatly appreciated! > > I use the following settings: > main node 192.168.22.100 (neptune) > raspberry pi 1 ( 192.168.22.102) > raspberry pi 2 ( 192.168.22.103) > > My syslog contains no error messages. > > gmond.conf (same for all hosts): > > cluster { > name = "my cluster" > owner = "unspecified" > latlong = "unspecified" > url = "unspecified" > } > udp_send_channel { > host=192.168.22.100 > port = 8649 > ttl = 1 > } > udp_recv_channel { > port = 8649 > } > > gmetad.conf: > data_source "my cluster" 15 192.168.22.100:8649 > <http://192.168.22.100:8649> > > > _______________________________________________ > Ganglia-general mailing list > [email protected] > https://lists.sourceforge.net/lists/listinfo/ganglia-general
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