125 lines
3.5 KiB
Nix
125 lines
3.5 KiB
Nix
# Zabbix server 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.zabbixServer;
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stateDir = "/var/run/zabbix";
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logDir = "/var/log/zabbix";
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libDir = "/var/lib/zabbix";
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pidFile = "${stateDir}/zabbix_server.pid";
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configFile = pkgs.writeText "zabbix_server.conf"
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''
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LogFile = ${logDir}/zabbix_server
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PidFile = ${pidFile}
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DBHost = ${cfg.dbServer}
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DBName = zabbix
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DBUser = zabbix
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${optionalString (cfg.dbPassword != "") ''
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DBPassword = ${cfg.dbPassword}
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''}
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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.zabbixServer.enable = mkOption {
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default = false;
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description = ''
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Whether to run the Zabbix server on this machine.
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'';
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};
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services.zabbixServer.dbServer = mkOption {
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default = "localhost";
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description = "Hostname or IP address of the database server.";
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};
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services.zabbixServer.dbPassword = mkOption {
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default = "";
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description = "Password used to connect to the database server.";
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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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services.postgresql.enable = cfg.dbServer == "localhost";
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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_server =
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{ name = "zabbix-server";
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description = "Zabbix server daemon";
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startOn = if cfg.dbServer == "localhost" then "started postgresql" else "filesystem";
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stopOn = if cfg.dbServer == "localhost" then "stopping postgresql" else "starting shutdown";
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preStart =
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''
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mkdir -m 0755 -p ${stateDir} ${logDir} ${libDir}
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chown zabbix ${stateDir} ${logDir} ${libDir}
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if ! test -e "${libDir}/db-created"; then
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${pkgs.postgresql}/bin/createuser --no-superuser --no-createdb --no-createrole zabbix || true
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${pkgs.postgresql}/bin/createdb --owner zabbix zabbix || true
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cat ${pkgs.zabbix.server}/share/zabbix/db/schema/postgresql.sql | ${pkgs.su}/bin/su -s "$SHELL" zabbix -c '${pkgs.postgresql}/bin/psql zabbix'
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cat ${pkgs.zabbix.server}/share/zabbix/db/data/data.sql | ${pkgs.su}/bin/su -s "$SHELL" zabbix -c '${pkgs.postgresql}/bin/psql zabbix'
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cat ${pkgs.zabbix.server}/share/zabbix/db/data/images_pgsql.sql | ${pkgs.su}/bin/su -s "$SHELL" zabbix -c '${pkgs.postgresql}/bin/psql zabbix'
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touch "${libDir}/db-created"
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fi
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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}/dummy
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mkfifo ${stateDir}/dummy
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cat ${stateDir}/dummy &
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pid=$!
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${pkgs.zabbix.server}/sbin/zabbix_server --config ${configFile} 100>${stateDir}/dummy
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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/pkill -u zabbix zabbix_server; do true; done
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'';
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};
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};
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}
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