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nixos/munin: enable munin_update and disable munin_stats

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munin_update relies on a stats file that exists, but isn't found in the
default location on NixOS; the appropriate plugin configuration is
added.

munin_stats relies on munin-cron writing a logfile, which the NixOS
build of munin does not. (This is probably fixable in the munin package,
but I don't have time to dig into that right now.)
This commit is contained in:
Ben Kelly 2018-12-14 19:26:02 -05:00 committed by Ben Kelly
parent e7c1449ae9
commit ace4855cf6
1 changed files with 12 additions and 1 deletions
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13
nixos/modules/services/monitoring/munin.nix
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@ -66,6 +66,9 @@ let
user root
group root
[munin*]
env.UPDATE_STATSFILE /var/lib/munin/munin-update.stats
${nodeCfg.extraPluginConfig}
'';
@ -226,13 +229,20 @@ in
};
disabledPlugins = mkOption {
default = [];
# TODO: figure out why Munin isn't writing the log file and fix it.
# In the meantime this at least suppresses a useless graph full of
# NaNs in the output.
default = [ "munin_stats" ];
type = with types; listOf string;
description = ''
Munin plugins to disable, even if
<literal>munin-node-configure --suggest</literal> tries to enable
them. To disable a wildcard plugin, use an actual wildcard, as in
the example.
munin_stats is disabled by default as it tries to read
<literal>/var/log/munin/munin-update.log</literal> for timing
information, and the NixOS build of Munin does not write this file.
'';
example = [ "diskstats" "zfs_usage_*" ];
};
@ -312,6 +322,7 @@ in
description = "Munin monitoring user";
group = "munin";
uid = config.ids.uids.munin;
home = "/var/lib/munin";
}];
users.groups = [{