nixpkgs/modules/services/monitoring/zabbix-server.nix
Eelco Dolstra 9127795e4a * Make sure that Upstart notices when the Zabbix server crashes so
that it can be restarted.  Zabbix is kind of hard to monitor, so use
  a trick with an open fifo to detect when it goes down.

svn path=/nixos/trunk/; revision=20039
2010-02-16 10:10:59 +00:00

108 lines
3 KiB
Nix

# Zabbix server daemon.
{ config, pkgs, ... }:
with pkgs.lib;
let
stateDir = "/var/run/zabbix";
logDir = "/var/log/zabbix";
libDir = "/var/lib/zabbix";
pidFile = "${stateDir}/zabbix_server.pid";
configFile = pkgs.writeText "zabbix_server.conf"
''
LogFile = ${logDir}/zabbix_server
PidFile = ${pidFile}
DBName = zabbix
DBUser = zabbix
'';
in
{
###### interface
options = {
services.zabbixServer.enable = mkOption {
default = false;
description = ''
Whether to run the Zabbix server on this machine.
'';
};
};
###### implementation
config = mkIf config.services.zabbixServer.enable {
services.postgresql.enable = true;
users.extraUsers = singleton
{ name = "zabbix";
uid = config.ids.uids.zabbix;
description = "Zabbix daemon user";
};
jobs.zabbix_server =
{ name = "zabbix-server";
description = "Zabbix server daemon";
startOn = "started postgresql";
stopOn = "stopping postgresql";
preStart =
''
mkdir -m 0755 -p ${stateDir} ${logDir} ${libDir}
chown zabbix ${stateDir} ${logDir} ${libDir}
if ! test -e "${libDir}/db-created"; then
${pkgs.postgresql}/bin/createuser --no-superuser --no-createdb --no-createrole zabbix || true
${pkgs.postgresql}/bin/createdb --owner zabbix zabbix || true
cat ${pkgs.zabbix.server}/share/zabbix/db/schema/postgresql.sql | ${pkgs.su}/bin/su -s "$SHELL" zabbix -c '${pkgs.postgresql}/bin/psql zabbix'
cat ${pkgs.zabbix.server}/share/zabbix/db/data/data.sql | ${pkgs.su}/bin/su -s "$SHELL" zabbix -c '${pkgs.postgresql}/bin/psql zabbix'
cat ${pkgs.zabbix.server}/share/zabbix/db/data/images_pgsql.sql | ${pkgs.su}/bin/su -s "$SHELL" zabbix -c '${pkgs.postgresql}/bin/psql zabbix'
touch "${libDir}/db-created"
fi
'';
# 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}/dummy
mkfifo ${stateDir}/dummy
cat ${stateDir}/dummy &
pid=$!
${pkgs.zabbix.server}/sbin/zabbix_server --config ${configFile} 100>${stateDir}/dummy
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/pkill -u zabbix zabbix_server; do true; done
'';
};
};
}