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# Nagios system/network monitoring daemon.
{ config, pkgs, ... }:
with pkgs.lib;
let
cfg = config.services.nagios;
nagiosUser = "nagios";
nagiosGroup = "nogroup";
nagiosState = "/var/lib/nagios";
nagiosLogDir = "/var/log/nagios";
nagiosObjectDefs =
[ ./timeperiods.cfg
./host-templates.cfg
./service-templates.cfg
./commands.cfg
] ++ cfg.objectDefs;
nagiosObjectDefsDir = pkgs.runCommand "nagios-objects" {inherit nagiosObjectDefs;}
"ensureDir $out; ln -s $nagiosObjectDefs $out/";
nagiosCfgFile = pkgs.writeText "nagios.cfg"
''
# Paths for state and logs.
log_file=${nagiosLogDir}/current
log_archive_path=${nagiosLogDir}/archive
status_file=${nagiosState}/status.dat
object_cache_file=${nagiosState}/objects.cache
comment_file=${nagiosState}/comment.dat
downtime_file=${nagiosState}/downtime.dat
temp_file=${nagiosState}/nagios.tmp
lock_file=/var/run/nagios.lock # Not used I think.
state_retention_file=${nagiosState}/retention.dat
# Configuration files.
#resource_file=resource.cfg
cfg_dir=${nagiosObjectDefsDir}
# Uid/gid that the daemon runs under.
nagios_user=${nagiosUser}
nagios_group=${nagiosGroup}
# Misc. options.
illegal_macro_output_chars=`~$&|'"<>
retain_state_information=1
''; # "
# Plain configuration for the Nagios web-interface with no
# authentication.
nagiosCGICfgFile = pkgs.writeText "nagios.cgi.conf"
''
main_config_file=${nagiosCfgFile}
use_authentication=0
url_html_path=/nagios
'';
urlPath = cfg.urlPath;
extraHttpdConfig =
''
ScriptAlias ${urlPath}/cgi-bin ${pkgs.nagios}/sbin
<Directory "${pkgs.nagios}/sbin">
Options ExecCGI
AllowOverride None
Order allow,deny
Allow from all
SetEnv NAGIOS_CGI_CONFIG ${nagiosCGICfgFile}
</Directory>
Alias ${urlPath} ${pkgs.nagios}/share
<Directory "${pkgs.nagios}/share">
Options None
AllowOverride None
Order allow,deny
Allow from all
</Directory>
'';
in
{
###### interface
options = {
services.nagios = {
enable = mkOption {
default = false;
description = "
Whether to use <link
xlink:href='http://www.nagios.org/'>Nagios</link> to monitor
your system or network.
";
};
objectDefs = mkOption {
description = "
A list of Nagios object configuration files that must define
the hosts, host groups, services and contacts for the
network that you want Nagios to monitor.
";
};
plugins = mkOption {
default = [pkgs.nagiosPluginsOfficial pkgs.ssmtp];
description = "
Packages to be added to the Nagios <envar>PATH</envar>.
Typically used to add plugins, but can be anything.
";
};
enableWebInterface = mkOption {
default = false;
description = "
Whether to enable the Nagios web interface. You should also
enable Apache (<option>services.httpd.enable</option>).
";
};
urlPath = mkOption {
default = "/nagios";
description = "
The URL path under which the Nagios web interface appears.
That is, you can access the Nagios web interface through
<literal>http://<replaceable>server</replaceable>/<replaceable>urlPath</replaceable></literal>.
";
};
};
};
###### implementation
config = mkIf cfg.enable {
users.extraUsers = singleton
{ name = nagiosUser;
uid = config.ids.uids.nagios;
description = "Nagios monitoring daemon";
home = nagiosState;
};
# This isn't needed, it's just so that the user can type "nagiostats
# -c /etc/nagios.cfg".
environment.etc = singleton
{ source = nagiosCfgFile;
target = "nagios.cfg";
};
environment.systemPackages = [ pkgs.nagios ];
jobs.nagios =
{ description = "Nagios monitoring daemon";
startOn = "started network-interfaces";
stopOn = "stopping network-interfaces";
preStart =
''
mkdir -m 0755 -p ${nagiosState} ${nagiosLogDir}
chown ${nagiosUser} ${nagiosState} ${nagiosLogDir}
'';
script =
''
for i in ${toString config.services.nagios.plugins}; do
export PATH=$i/bin:$i/sbin:$i/libexec:$PATH
done
exec ${pkgs.nagios}/bin/nagios ${nagiosCfgFile}
'';
};
services.httpd.extraConfig = optionalString cfg.enableWebInterface extraHttpdConfig;
};
}
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