[bradm] Add nagios checks

config.yaml

@@ -68,4 +68,19 @@ options:
        InnoDB table into separate .idb file. Existing InnoDB tables will remain
        in ibdata1 file - full dump/import is needed to get rid of large
        ibdata1 file
-     
+  nagios_context:
+    default: "juju"
+    type: string
+    description: |
+      Used by the nrpe-external-master subordinate charm.
+      A string that will be prepended to instance name to set the host name
+      in nagios. So for instance the hostname would be something like:
+          juju-myservice-0
+      If you're running multiple environments with the same services in them
+      this allows you to differentiate between them.
+  nagios_servicegroups:
+    default: ""
+    type: string
+    description: |
+      A comma-separated list of nagios servicegroups.
+      If left empty, the nagios_context will be used as the servicegroup

hooks/percona_hooks.py

@@ -69,6 +69,8 @@ from charmhelpers.contrib.network.ip import (
     is_address_in_network,
 )
 
+from charmhelpers.contrib.charmsupport import nrpe
+
 hooks = Hooks()
 
 LEADER_RES = 'grp_percona_cluster'
@@ -424,6 +426,23 @@ def ha_relation_changed():
             relation_clear(r_id)
 
 
+@hooks.hook('nrpe-external-master-relation-joined',
+            'nrpe-external-master-relation-changed')
+def update_nrpe_config():
+    # python-dbus is used by check_upstart_job
+    apt_install('python-dbus')
+    hostname = nrpe.get_nagios_hostname()
+    current_unit = nrpe.get_nagios_unit_name()
+    nrpe_setup = nrpe.NRPE(hostname=hostname)
+    nrpe.add_init_service_checks(nrpe_setup, 'mysql', current_unit)
+    nrpe_setup.add_check(
+        shortname='mysql_proc',
+        description='Check MySQL process {%s}' % current_unit,
+        check_cmd='check_procs -c 1:1 -C mysqld'
+    )
+    nrpe_setup.write()
+
+
 def main():
     try:
         hooks.execute(sys.argv)