Oh yes, problem #2. The displayed numeric IP addresses were replaced with hostnames when I added their addresses to /etc/hosts.
On 12/28/20 8:26 PM, Stuart Levy wrote: > 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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