* Upstart job for Nagios (system/network monitoring daemon).

svn path=/nixos/trunk/; revision=9658

system/ids.nix

@@ -7,6 +7,7 @@
     ntp = 3;
     messagebus = 4; # D-Bus
     haldaemon = 5;
+    nagios = 6;
     nixbld = 30000; # start of range of uids
     nobody = 65534;
   };

system/options.nix

@@ -1180,6 +1180,36 @@
     };
 
 
+    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.
+        ";
+      };
+
+    };
+
+
   };
 
 

upstart-jobs/default.nix

@@ -226,6 +226,12 @@ import ../upstart-jobs/gather.nix {
       inherit (pkgs) stdenv hal;
     })
 
+  # Nagios system/network monitoring daemon.
+  ++ optional config.services.nagios.enable
+    (import ../upstart-jobs/nagios {
+      inherit config pkgs;
+    })
+
   # Handles the reboot/halt events.
   ++ (map
     (event: makeJob (import ../upstart-jobs/halt.nix {

upstart-jobs/make-job.nix

@@ -5,8 +5,12 @@
     job.jobDrv
   else
     (
-      runCommand ("upstart-" + job.name) {inherit (job) job; jobName = job.name;}
-        "ensureDir $out/etc/event.d; echo \"$job\" > $out/etc/event.d/$jobName"
+      runCommand ("upstart-" + job.name)
+        { inherit (job) job;
+          jobName = job.name;
+          buildHook = if job ? buildHook then job.buildHook else "true";
+        }
+        "eval \"$buildHook\"; ensureDir $out/etc/event.d; echo \"$job\" > $out/etc/event.d/$jobName"
     )
 )
 

upstart-jobs/nagios/commands.cfg

@@ -0,0 +1,34 @@
+define command {
+    command_name host-notify-by-email
+    command_line printf "%b" "Subject: [Nagios] Host $HOSTSTATE$ alert for $HOSTNAME$\n\n***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\nHost: $HOSTNAME$\nState: $HOSTSTATE$\nAddress: $HOSTADDRESS$\nInfo: $HOSTOUTPUT$\n\nDate/Time: $LONGDATETIME$\n" | sendmail $CONTACTEMAIL$
+}
+
+
+define command{
+    command_name notify-by-email
+    command_line printf "%b" "Subject: [Nagios] $NOTIFICATIONTYPE$ alert - $HOSTALIAS$/$SERVICEDESC$ is $SERVICESTATE$\n\n***** Nagios *****\n\nNotification Type: $NOTIFICATIONTYPE$\nService: $SERVICEDESC$\nHost: $HOSTALIAS$\nAddress: $HOSTADDRESS$\nState: $SERVICESTATE$\n\nDate/Time: $LONGDATETIME$\n\nAdditional Info:\n\n$SERVICEOUTPUT$" | sendmail $CONTACTEMAIL$
+}
+
+
+define command {
+    command_name dummy-ok
+    command_line true
+}
+
+
+define command {
+    command_name check-host-alive
+    command_line check_ping -H $HOSTADDRESS$ -w 3000.0,80% -c 5000.0,100% -p 1
+}
+
+
+define command {
+    command_name check_local_disk
+    command_line check_disk -w $ARG1$ -c $ARG2$ -p $ARG3$
+}
+
+
+define command {
+    command_name check_ssh
+    command_line check_ssh $HOSTADDRESS$
+}

upstart-jobs/nagios/default.nix

@@ -0,0 +1,87 @@
+{config, pkgs}:
+
+let
+
+  nagiosUser = "nagios";
+  nagiosGroup = "nogroup";
+
+  nagiosState = "/var/lib/nagios";
+  nagiosLogDir = "/var/log/nagios";
+
+  nagiosObjectDefs = [
+    ./timeperiods.cfg
+    ./host-templates.cfg
+    ./service-templates.cfg
+    ./commands.cfg
+  ] ++ config.services.nagios.objectDefs;
+
+  nagiosObjectDefsDir = pkgs.runCommand "nagios-objects" {}
+    "ensureDir $out; ln -s ${toString 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=`~$&|'\"<>
+    retain_state_information=1
+    
+  ";
+
+in
+
+{
+  name = "nagios";
+  
+  users = [
+    { name = nagiosUser;
+      uid = (import ../../system/ids.nix).uids.nagios;
+      description = "Nagios monitoring daemon";
+      home = nagiosState;
+    }
+  ];
+
+  # Run `nagios -v' to check the validity of the configuration file so
+  # that a nixos-rebuild fails *before* we kill the running Nagios
+  # daemon.
+  buildHook = "${pkgs.nagios}/bin/nagios -v ${nagiosCfgFile}";
+
+  job = "
+    description \"Nagios monitoring daemon\"
+
+    start on network-interfaces/started
+    stop on network-interfaces/stop
+
+    start script
+      mkdir -m 0755 -p ${nagiosState} ${nagiosLogDir}
+      chown ${nagiosUser} ${nagiosState} ${nagiosLogDir}
+    end script
+
+    respawn
+
+    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}
+    end script
+  ";
+  
+}

upstart-jobs/nagios/host-templates.cfg

@@ -0,0 +1,27 @@
+define host {
+    name                            generic-host
+    notifications_enabled           1
+    event_handler_enabled           1
+    flap_detection_enabled          1
+    failure_prediction_enabled      1
+    process_perf_data               1
+    retain_status_information       1
+    retain_nonstatus_information    1
+    notification_period             24x7
+    register                        0
+}
+
+
+define host {
+    name                            generic-server
+    use                             generic-host
+    check_period                    24x7
+    max_check_attempts              10
+    check_command                   check-host-alive
+    notification_period             24x7
+    notification_interval           120
+    notification_options            d,u,r
+    contact_groups                  admins
+    register                        0
+    #check_interval                 1
+}

upstart-jobs/nagios/service-templates.cfg

@@ -0,0 +1,32 @@
+define service {
+    name                            generic-service
+    active_checks_enabled           1
+    passive_checks_enabled          1
+    parallelize_check               1
+    obsess_over_service             1
+    check_freshness                 0
+    notifications_enabled           1
+    event_handler_enabled           1
+    flap_detection_enabled          1
+    failure_prediction_enabled      1
+    process_perf_data               1
+    retain_status_information       1
+    retain_nonstatus_information    1
+    is_volatile                     0
+    register                        0
+}
+
+
+define service {
+    name                            local-service
+    use                             generic-service
+    check_period                    24x7
+    max_check_attempts              4
+    normal_check_interval           5
+    retry_check_interval            1
+    contact_groups                  admins
+    notification_options            w,u,c,r
+    notification_interval           0 # notify only once
+    notification_period             24x7
+    register                        0
+}

upstart-jobs/nagios/timeperiods.cfg

@@ -0,0 +1,11 @@
+define timeperiod {
+    timeperiod_name 24x7
+    alias           24 Hours A Day, 7 Days A Week
+    sunday          00:00-24:00
+    monday          00:00-24:00
+    tuesday         00:00-24:00
+    wednesday       00:00-24:00
+    thursday        00:00-24:00
+    friday          00:00-24:00
+    saturday        00:00-24:00
+}