Empty list of plugins/services with 1.4.5

btw: I've looked at the points listed in http://munin-monitoring.org/wiki/FAQ_no_graphs (after having seen a link to it in some log file).

thanks for the report.

if you try launching munin-node with the --debug option enabled, you should find that munin-node.log lists all the plugins that are being loaded, and also report any plugins that are being dropped due to errors.

I can confirm that after the package was updated from 1.4.3 to 1.4.5 on RHEL5 (using the epel repository) that munin stopped listing the plugins, however fetch appears to be working normally:

Before upgrade:

$ telnet localhost 4949
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
# munin node at ###########.com
list
apache_accesses apache_processes apache_volume cpu df df_inode entropy forks fw_packets http_loadtime if_err_eth0 if_err_eth1 if_eth0 if_eth1 interrupts iostat iostat_ios irqstats load memory munin_stats netstat nfs4_client ntp_kernel_err ntp_kernel_pll_freq ntp_kernel_pll_off ntp_offset open_files open_inodes postfix_mailqueue postfix_mailvolume proc_pri processes sendmail_mailqueue sendmail_mailstats sendmail_mailtraffic swap threads uptime users vmstat yum

After:

$ telnet localhost 4949
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
# munin node at ###########.com
list

The problem appears to be (for me) that in node/lib/Munin/Node/Server.pm:

!#perl
sub _list_services {
...
if (exists $nodes{$node})
...

exists $nodes{$node} evaluates to false. returning a faked array within an else statement:

!#perl
...
    } else {
        _net_write($session, join(" ", ('cpu','df_inode')));
...

confirms it.

As far as i can tell, the $node variable's value (used when storing and fetching the array of services) is identical... so what else could this be?

ok, this is a stupid fix, but it works for a single node:

!#perl
sub _list_services {
    my ($session, $node) = @_;
    $node ||= $config->{fqdn};

    logger(qq{Using node: $node});

    if (exists $nodes{$node}) {
        my @services = @{$nodes{$node}};

        # remove any plugins that require capabilities the master doesn't support
        @services = Munin::Node::Utils::set_difference(\@services, \@multigraph_services)
            unless $session->{server_capabilities}{multigraph};
        @services = Munin::Node::Utils::set_difference(\@services, \@dirtyconfig_services)
            unless $session->{server_capabilities}{dirtyconfig};

        _net_write($session, join(" ", @services));
    } else {
        my @services = keys %services;
        _net_write($session, join(" ", @services));
    }
    _net_write($session, "\n");
}

Solved in Server.pm:

312c312
<     $node ||= lc($config->{fqdn});
---
>     $node ||= $config->{fqdn};

The server name is forced to lowercase when the services are being set, but not when matching within sub _list_services. Please fix for next release.

it looks like this was fixed in r3404, which unfortunately predates munin-1.4.5. but it should find it's way into the next release.

specifically, it's this hunk here: http://munin-monitoring.org/changeset/3404#file19

Closing this ticket as ligne has backported the patch. The fix will be in the next 1.4 release.

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