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191 lines
5.2 KiB
Nix
191 lines
5.2 KiB
Nix
# Nagios system/network monitoring daemon.
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{ config, lib, pkgs, ... }:
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with lib;
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let
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cfg = config.services.nagios;
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nagiosState = "/var/lib/nagios";
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nagiosLogDir = "/var/log/nagios";
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nagiosObjectDefs = cfg.objectDefs;
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nagiosObjectDefsDir = pkgs.runCommand "nagios-objects" {inherit nagiosObjectDefs;}
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"mkdir -p $out; ln -s $nagiosObjectDefs $out/";
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nagiosCfgFile = pkgs.writeText "nagios.cfg"
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''
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# Paths for state and logs.
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log_file=${nagiosLogDir}/current
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log_archive_path=${nagiosLogDir}/archive
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status_file=${nagiosState}/status.dat
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object_cache_file=${nagiosState}/objects.cache
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temp_file=${nagiosState}/nagios.tmp
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lock_file=/var/run/nagios.lock # Not used I think.
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state_retention_file=${nagiosState}/retention.dat
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query_socket=${nagiosState}/nagios.qh
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check_result_path=${nagiosState}
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command_file=${nagiosState}/nagios.cmd
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# Configuration files.
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#resource_file=resource.cfg
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cfg_dir=${nagiosObjectDefsDir}
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# Uid/gid that the daemon runs under.
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nagios_user=nagios
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nagios_group=nogroup
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# Misc. options.
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illegal_macro_output_chars=`~$&|'"<>
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retain_state_information=1
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''; # "
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# Plain configuration for the Nagios web-interface with no
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# authentication.
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nagiosCGICfgFile = pkgs.writeText "nagios.cgi.conf"
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''
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main_config_file=${cfg.mainConfigFile}
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use_authentication=0
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url_html_path=${cfg.urlPath}
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'';
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extraHttpdConfig =
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''
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ScriptAlias ${cfg.urlPath}/cgi-bin ${pkgs.nagios}/sbin
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<Directory "${pkgs.nagios}/sbin">
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Options ExecCGI
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AllowOverride None
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Order allow,deny
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Allow from all
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SetEnv NAGIOS_CGI_CONFIG ${cfg.cgiConfigFile}
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</Directory>
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Alias ${cfg.urlPath} ${pkgs.nagios}/share
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<Directory "${pkgs.nagios}/share">
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Options None
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AllowOverride None
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Order allow,deny
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Allow from all
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</Directory>
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'';
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in
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{
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options = {
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services.nagios = {
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enable = mkOption {
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default = false;
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description = "
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Whether to use <link
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xlink:href='http://www.nagios.org/'>Nagios</link> to monitor
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your system or network.
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";
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};
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objectDefs = mkOption {
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description = "
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A list of Nagios object configuration files that must define
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the hosts, host groups, services and contacts for the
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network that you want Nagios to monitor.
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";
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};
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plugins = mkOption {
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type = types.listOf types.package;
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default = [pkgs.nagiosPluginsOfficial pkgs.ssmtp];
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defaultText = "[pkgs.nagiosPluginsOfficial pkgs.ssmtp]";
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description = "
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Packages to be added to the Nagios <envar>PATH</envar>.
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Typically used to add plugins, but can be anything.
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";
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};
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mainConfigFile = mkOption {
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type = types.package;
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default = nagiosCfgFile;
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defaultText = "nagiosCfgFile";
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description = "
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Derivation for the main configuration file of Nagios.
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";
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};
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cgiConfigFile = mkOption {
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type = types.package;
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default = nagiosCGICfgFile;
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defaultText = "nagiosCGICfgFile";
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description = "
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Derivation for the configuration file of Nagios CGI scripts
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that can be used in web servers for running the Nagios web interface.
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";
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};
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enableWebInterface = mkOption {
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default = false;
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description = "
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Whether to enable the Nagios web interface. You should also
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enable Apache (<option>services.httpd.enable</option>).
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";
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};
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urlPath = mkOption {
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default = "/nagios";
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description = "
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The URL path under which the Nagios web interface appears.
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That is, you can access the Nagios web interface through
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<literal>http://<replaceable>server</replaceable>/<replaceable>urlPath</replaceable></literal>.
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";
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};
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};
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};
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config = mkIf cfg.enable {
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users.extraUsers.nagios = {
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description = "Nagios user ";
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uid = config.ids.uids.nagios;
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home = nagiosState;
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createHome = true;
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};
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# This isn't needed, it's just so that the user can type "nagiostats
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# -c /etc/nagios.cfg".
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environment.etc = [
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{ source = cfg.mainConfigFile;
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target = "nagios.cfg";
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}
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];
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environment.systemPackages = [ pkgs.nagios ];
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systemd.services.nagios = {
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description = "Nagios monitoring daemon";
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path = [ pkgs.nagios ];
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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serviceConfig = {
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User = "nagios";
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Restart = "always";
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RestartSec = 2;
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PermissionsStartOnly = true;
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};
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preStart = ''
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mkdir -m 0755 -p ${nagiosState} ${nagiosLogDir}
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chown nagios ${nagiosState} ${nagiosLogDir}
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'';
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script = ''
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for i in ${toString cfg.plugins}; do
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export PATH=$i/bin:$i/sbin:$i/libexec:$PATH
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done
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exec ${pkgs.nagios}/bin/nagios ${cfg.mainConfigFile}
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'';
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};
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services.httpd.extraConfig = optionalString cfg.enableWebInterface extraHttpdConfig;
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};
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}
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