1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
|
{ config, lib, pkgs, ... }:
# TODO: support munin-async
# TODO: LWP/Pg perl libs aren't recognized
# TODO: support fastcgi
# http://munin-monitoring.org/wiki/CgiHowto2
# spawn-fcgi -s /var/run/munin/fastcgi-graph.sock -U www-data -u munin -g munin /usr/lib/munin/cgi/munin-cgi-graph
# spawn-fcgi -s /var/run/munin/fastcgi-html.sock -U www-data -u munin -g munin /usr/lib/munin/cgi/munin-cgi-html
# https://paste.sh/vofcctHP#-KbDSXVeWoifYncZmLfZzgum
# nginx http://munin.readthedocs.org/en/latest/example/webserver/nginx.html
with lib;
let
nodeCfg = config.services.munin-node;
cronCfg = config.services.munin-cron;
muninPlugins = pkgs.stdenv.mkDerivation {
name = "munin-available-plugins";
buildCommand = ''
mkdir -p $out
cp --preserve=mode ${pkgs.munin}/lib/plugins/* $out/
for file in $out/*; do
case "$file" in
plugin.sh) continue;;
esac
# read magic makers from the file
family=$(sed -nr 's/.*#%#\s+family\s*=\s*(\S+)\s*/\1/p' $file)
cap=$(sed -nr 's/.*#%#\s+capabilities\s*=\s*(.+)/\1/p' $file)
wrapProgram $file \
--set PATH "/var/setuid-wrappers:/run/current-system/sw/bin:/run/current-system/sw/bin" \
--set MUNIN_LIBDIR "${pkgs.munin}/lib" \
--set MUNIN_PLUGSTATE "/var/run/munin"
# munin uses markers to tell munin-node-configure what a plugin can do
echo "#%# family=$family" >> $file
echo "#%# capabilities=$cap" >> $file
done
# NOTE: we disable disktstats because plugin seems to fail and it hangs html generation (100% CPU + memory leak)
rm -f $out/diskstats
'';
buildInputs = [ pkgs.makeWrapper ];
};
muninConf = pkgs.writeText "munin.conf"
''
dbdir /var/lib/munin
htmldir /var/www/munin
logdir /var/log/munin
rundir /var/run/munin
${cronCfg.extraGlobalConfig}
${cronCfg.hosts}
'';
nodeConf = pkgs.writeText "munin-node.conf"
''
log_level 3
log_file Sys::Syslog
port 4949
host *
background 0
user root
group root
host_name ${config.networking.hostName}
setsid 0
# wrapped plugins by makeWrapper being with dots
ignore_file ^\.
allow ^127\.0\.0\.1$
${nodeCfg.extraConfig}
'';
in
{
options = {
services.munin-node = {
enable = mkOption {
default = false;
description = ''
Enable Munin Node agent. Munin node listens on 0.0.0.0 and
by default accepts connections only from 127.0.0.1 for security reasons.
See <link xlink:href='http://munin-monitoring.org/wiki/munin-node.conf' />.
'';
};
extraConfig = mkOption {
default = "";
description = ''
<filename>munin-node.conf</filename> extra configuration. See
<link xlink:href='http://munin-monitoring.org/wiki/munin-node.conf' />
'';
};
# TODO: add option to add additional plugins
};
services.munin-cron = {
enable = mkOption {
default = false;
description = ''
Enable munin-cron. Takes care of all heavy lifting to collect data from
nodes and draws graphs to html. Runs munin-update, munin-limits,
munin-graphs and munin-html in that order.
HTML output is in <filename>/var/www/munin/</filename>, configure your
favourite webserver to serve static files.
'';
example = literalExample ''
services = {
munin-node.enable = true;
munin-cron = {
enable = true;
hosts = '''
[''${config.networking.hostName}]
address localhost
''';
extraGlobalConfig = '''
contact.email.command mail -s "Munin notification for ''${var:host}" someone@example.com
''';
};
};
'';
};
extraGlobalConfig = mkOption {
default = "";
description = ''
<filename>munin.conf</filename> extra global configuration.
See <link xlink:href='http://munin-monitoring.org/wiki/munin.conf' />.
Useful to setup notifications, see
<link xlink:href='http://munin-monitoring.org/wiki/HowToContact' />
'';
};
hosts = mkOption {
example = ''
[''${config.networking.hostName}]
address localhost
'';
description = ''
Definitions of hosts of nodes to collect data from. Needs at least one
hosts for cron to succeed. See
<link xlink:href='http://munin-monitoring.org/wiki/munin.conf' />
'';
};
};
};
config = mkMerge [ (mkIf (nodeCfg.enable || cronCfg.enable) {
environment.systemPackages = [ pkgs.munin ];
users.extraUsers = [{
name = "munin";
description = "Munin monitoring user";
group = "munin";
uid = config.ids.uids.munin;
}];
users.extraGroups = [{
name = "munin";
gid = config.ids.gids.munin;
}];
}) (mkIf nodeCfg.enable {
systemd.services.munin-node = {
description = "Munin Node";
after = [ "network.target" ];
wantedBy = [ "multi-user.target" ];
path = [ pkgs.munin ];
environment.MUNIN_PLUGSTATE = "/var/run/munin";
preStart = ''
echo "updating munin plugins..."
mkdir -p /etc/munin/plugins
rm -rf /etc/munin/plugins/*
PATH="/var/setuid-wrappers:/run/current-system/sw/bin:/run/current-system/sw/bin" ${pkgs.munin}/sbin/munin-node-configure --shell --families contrib,auto,manual --config ${nodeConf} --libdir=${muninPlugins} --servicedir=/etc/munin/plugins 2>/dev/null | ${pkgs.bash}/bin/bash
'';
serviceConfig = {
ExecStart = "${pkgs.munin}/sbin/munin-node --config ${nodeConf} --servicedir /etc/munin/plugins/";
};
};
}) (mkIf cronCfg.enable {
services.cron.systemCronJobs = [
"*/5 * * * * munin ${pkgs.munin}/bin/munin-cron --config ${muninConf}"
];
system.activationScripts.munin-cron = stringAfter [ "users" "groups" ] ''
mkdir -p /var/{run,log,www,lib}/munin
chown -R munin:munin /var/{run,log,www,lib}/munin
'';
})];
}
|