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nagios: various improvements
* structured config for main config file allows to launch nagios in
debug mode without having to write the whole config file by hand
* build time syntax check
* all options have types, one more example
* I find it misleading that the main nagios config file is linked in
/etc but that if you change the link in /etc/ and restart nagios, it
has no effect. Have nagios use /etc/nagios.cfg
* fix paths in example nagios config files, which allows to reuse it:
services.nagios.objectDefs =
(map (x: "${pkgs.nagios}/etc/objects/${x}.cfg")
[ "templates" "timeperiods" "commands" ]) ++ [ ./main.cfg ]
* for the above reason, add mailutils to default plugins
Co-Authored-By: Aaron Andersen <aaron@fosslib.net>
This commit is contained in:
symphorien+git@xlumurb.eu
Symphorien Gibol
parent
fa28c7750a
commit
be25e45fc8
2 changed files with 71 additions and 49 deletions
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@ -17,32 +17,39 @@ let
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preferLocalBuild = true;
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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=/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=${nagiosObjectDefsDir}
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# Uid/gid that the daemon runs under.
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nagios_user=nagios
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nagios_group=nagios
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# Misc. options.
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illegal_macro_output_chars=`~$&|'"<>
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retain_state_information=1
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''; # "
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nagiosCfgFile = let
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default = {
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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="${nagiosState}/nagios.tmp";
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lock_file="/run/nagios.lock";
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state_retention_file="${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="${nagiosState}/nagios.cmd";
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cfg_dir="${nagiosObjectDefsDir}";
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nagios_user="nagios";
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nagios_group="nagios";
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illegal_macro_output_chars="`~$&|'\"<>";
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retain_state_information="1";
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};
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lines = mapAttrsToList (key: value: "${key}=${value}") (default // cfg.extraConfig);
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content = concatStringsSep "\n" lines;
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file = pkgs.writeText "nagios.cfg" content;
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validated = pkgs.runCommand "nagios-checked.cfg" {preferLocalBuild=true;} ''
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cp ${file} nagios.cfg
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# nagios checks the existence of /var/lib/nagios, but
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# it does not exists in the build sandbox, so we fake it
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mkdir lib
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lib=$(readlink -f lib)
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sed -i s@=${nagiosState}@=$lib@ nagios.cfg
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${pkgs.nagios}/bin/nagios -v nagios.cfg && cp ${file} $out
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'';
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defaultCfgFile = if cfg.validateConfig then validated else file;
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in
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if cfg.mainConfigFile == null then defaultCfgFile else cfg.mainConfigFile;
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# Plain configuration for the Nagios web-interface with no
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# authentication.
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@ -77,16 +84,11 @@ in
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(mkRemovedOptionModule [ "services" "nagios" "urlPath" ] "The urlPath option has been removed as it is hard coded to /nagios in the nagios package.")
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];
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meta.maintainers = with lib.maintainers; [ symphorien ];
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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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enable = mkEnableOption "<link xlink:href='http://www.nagios.org/'>Nagios</link> to monitor your system or network.";
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objectDefs = mkOption {
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description = "
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@ -94,12 +96,14 @@ in
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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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type = types.listOf types.path;
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example = literalExample "[ ./objects.cfg ]";
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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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default = with pkgs; [ nagiosPluginsOfficial ssmtp mailutils ];
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defaultText = "[pkgs.nagiosPluginsOfficial pkgs.ssmtp pkgs.mailutils]";
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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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@ -107,14 +111,29 @@ in
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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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type = types.nullOr types.package;
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default = null;
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description = "
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Derivation for the main configuration file of Nagios.
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If non-null, overrides the main configuration file of Nagios.
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";
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};
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extraConfig = mkOption {
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type = types.attrsOf types.str;
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example = {
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debug_level = "-1";
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debug_file = "/var/log/nagios/debug.log";
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};
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default = {};
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description = "Configuration to add to /etc/nagios.cfg";
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};
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validateConfig = mkOption {
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type = types.bool;
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default = pkgs.stdenv.hostPlatform == pkgs.stdenv.buildPlatform;
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description = "if true, the syntax of the nagios configuration file is checked at build time";
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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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@ -126,6 +145,7 @@ in
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};
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enableWebInterface = mkOption {
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type = types.bool;
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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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@ -165,7 +185,7 @@ in
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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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{ source = nagiosCfgFile;
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target = "nagios.cfg";
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}
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];
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@ -173,7 +193,7 @@ in
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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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path = [ pkgs.nagios ] ++ cfg.plugins;
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wantedBy = [ "multi-user.target" ];
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after = [ "network.target" ];
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@ -184,14 +204,9 @@ in
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RestartSec = 2;
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LogsDirectory = "nagios";
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StateDirectory = "nagios";
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ExecStart = "${pkgs.nagios}/bin/nagios /etc/nagios.cfg";
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X-ReloadIfChanged = nagiosCfgFile;
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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.virtualHosts = optionalAttrs cfg.enableWebInterface {
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