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