Adding a module for system health monitoring (getting graphs generated by rrdtool

of usual system counters).
It sets up some cron jobs for collecting the data, and not that often, generating the
graphs. Then the httpd server is configured with a directory with the generated
static files.

http://www.brianlane.com/software/systemhealth/

svn path=/nixos/trunk/; revision=18866
This commit is contained in:
Lluís Batlle i Rossell 2009-12-09 21:45:59 +00:00
parent b005e22952
commit 60b856b115
2 changed files with 131 additions and 0 deletions

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@ -60,6 +60,7 @@
./services/misc/synergy.nix
./services/monitoring/monit.nix
./services/monitoring/nagios/default.nix
./services/monitoring/systemhealth.nix
./services/monitoring/zabbix-agent.nix
./services/monitoring/zabbix-server.nix
./services/network-filesystems/nfs-kernel.nix

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@ -0,0 +1,130 @@
{config, pkgs, ...}:
with pkgs.lib;
let
cfg = config.services.systemhealth;
systemhealth = with pkgs; stdenv.mkDerivation {
name = "systemhealth-1.0";
src = fetchurl {
url = "http://www.brianlane.com/software/systemhealth/src/systemhealth-1.0.tar.bz2";
sha256 = "1q69lz7hmpbdpbz36zb06nzfkj651413n9icx0njmyr3xzq1j9qy";
};
buildInputs = [ python ];
installPhase = ''
ensureDir $out/bin
cp system_health.py $out/bin
'';
};
rrdDir = "/var/lib/health/rrd";
htmlDir = "/var/lib/health/html";
configFile = rrdDir + "/.syshealthrc";
# The program will try to read $HOME/.syshealthrc, so we set the proper home.
command = "HOME=${rrdDir} ${systemhealth}/bin/system_health.py";
cronJob = ''
*/5 * * * * wwwrun ${command} --log
5 * * * * wwwrun ${command} --graph
'';
nameEqualName = s: "${s} = ${s}";
interfacesSection = concatStringsSep "\n" (map nameEqualName cfg.interfaces);
driveLine = d: "${d.path} = ${d.name}";
drivesSection = concatStringsSep "\n" (map driveLine cfg.drives);
in
{
options = {
services.systemhealth = {
enable = mkOption {
default = false;
description = ''
Enable the system health monitor and its generation of graphs.
'';
};
urlPrefix = mkOption {
default = "/health";
description = ''
The URL prefix under which the System Health web pages appear in httpd.
'';
};
interfaces = mkOption {
default = [ "lo" ];
example = [ "lo" "eth0" "eth1" ];
description = ''
Interfaces to monitor (minimum one).
'';
};
drives = mkOption {
default = [ ];
example = [ { name = "root"; path = "/"; } ];
description = ''
Drives to monitor.
'';
};
};
};
config = mkIf cfg.enable {
services.cron.systemCronJobs = [ cronJob ];
system.activationScripts.systemhealth = fullDepEntry ''
mkdir -p ${rrdDir} ${htmlDir}
chown wwwrun.wwwrun ${rrdDir} ${htmlDir}
cat >${configFile} << EOF
[paths]
rrdtool = ${pkgs.rrdtool}/bin/rrdtool
loadavg_rrd = loadavg
ps = /var/run/current-system/sw/bin/ps
df = /var/run/current-system/sw/bin/df
meminfo_rrd = meminfo
uptime_rrd = uptime
rrd_path = ${rrdDir}
png_path = ${htmlDir}
[processes]
[interfaces]
${interfacesSection}
[drives]
${drivesSection}
[graphs]
width = 400
time = ['-3hours', '-32hours', '-8days', '-5weeks', '-13months']
height = 100
[external]
EOF
chown wwwrun.wwwrun ${configFile}
${pkgs.su}/bin/su -s "/bin/sh" -c "${command} --check" wwwrun
${pkgs.su}/bin/su -s "/bin/sh" -c "${command} --html" wwwrun
'' [ "var" ];
services.httpd.extraSubservices = [
{ function = f: {
extraConfig = ''
Alias ${cfg.urlPrefix} ${htmlDir}
<Directory ${htmlDir}>
Order allow,deny
Allow from all
</Directory>
'';
};
}
];
};
}