nixpkgs/modules/services/monitoring/zabbix-agent.nix
Peter Simons eb6e1310b8 strip trailing whitespace; no functional change
svn path=/nixos/trunk/; revision=29285
2011-09-14 18:20:50 +00:00

121 lines
2.7 KiB
Nix

# Zabbix agent daemon.
{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.services.zabbixAgent;
stateDir = "/var/run/zabbix";
logDir = "/var/log/zabbix";
pidFile = "${stateDir}/zabbix_agentd.pid";
configFile = pkgs.writeText "zabbix_agentd.conf"
''
Server = ${cfg.server}
LogFile = ${logDir}/zabbix_agentd
PidFile = ${pidFile}
StartAgents = 1
${config.services.zabbixAgent.extraConfig}
'';
in
{
###### interface
options = {
services.zabbixAgent = {
enable = mkOption {
default = false;
description = ''
Whether to run the Zabbix monitoring agent on this machine.
It will send monitoring data to a Zabbix server.
'';
};
server = mkOption {
default = "127.0.0.1";
description = ''
The IP address or hostname of the Zabbix server to connect to.
'';
};
extraConfig = mkOption {
default = "";
description = ''
Configuration that is injected verbatim into the configuration file.
'';
};
};
};
###### implementation
config = mkIf cfg.enable {
users.extraUsers = singleton
{ name = "zabbix";
uid = config.ids.uids.zabbix;
description = "Zabbix daemon user";
};
jobs.zabbix_agent =
{ name = "zabbix-agent";
description = "Zabbix agent daemon";
startOn = "ip-up";
stopOn = "stopping network-interfaces";
preStart =
''
mkdir -m 0755 -p ${stateDir} ${logDir}
chown zabbix ${stateDir} ${logDir}
'';
# Zabbix doesn't have an option not to daemonize, and doesn't
# daemonize in a way that allows Upstart to track it. So to
# make sure that we notice when it goes down, we start Zabbix
# with an open connection to a fifo, with a `cat' on the other
# side. If Zabbix dies, then `cat' will exit as well, so we
# just monitor `cat'.
script =
''
export PATH=${pkgs.nettools}/bin:$PATH
rm -f ${stateDir}/dummy2
mkfifo ${stateDir}/dummy2
cat ${stateDir}/dummy2 &
pid=$!
${pkgs.zabbix.agent}/sbin/zabbix_agentd --config ${configFile} 100>${stateDir}/dummy2
wait "$pid"
'';
postStop =
''
pid=$(cat ${pidFile} 2> /dev/null || true)
(test -n "$pid" && kill "$pid") || true
# Wait until they're really gone.
while ${pkgs.procps}/bin/pgrep -u zabbix zabbix_agentd > /dev/null; do sleep 1; done
'';
};
environment.systemPackages = [ pkgs.zabbix.agent ];
};
}