summaryrefslogtreecommitdiffstats
path: root/compass-tasks-base/actions/health_check/check_dns.py
diff options
context:
space:
mode:
Diffstat (limited to 'compass-tasks-base/actions/health_check/check_dns.py')
-rw-r--r--compass-tasks-base/actions/health_check/check_dns.py139
1 files changed, 139 insertions, 0 deletions
diff --git a/compass-tasks-base/actions/health_check/check_dns.py b/compass-tasks-base/actions/health_check/check_dns.py
new file mode 100644
index 0000000..843d7e2
--- /dev/null
+++ b/compass-tasks-base/actions/health_check/check_dns.py
@@ -0,0 +1,139 @@
+# Copyright 2014 Huawei Technologies Co. Ltd
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+"""Health Check module for DNS service."""
+
+import commands
+import os
+import socket
+import xmlrpclib
+
+from compass.actions.health_check import base
+
+
+class DnsCheck(base.BaseCheck):
+ """dns health check class."""
+ NAME = "DNS Check"
+
+ def run(self):
+ """do health check."""
+ method_name = "self.check_" + self.os_installer['name'] + "_dns()"
+ return eval(method_name)
+
+ def check_cobbler_dns(self):
+ """Checks if Cobbler has taken over DNS service."""
+ try:
+ remote = xmlrpclib.Server(
+ self.os_installer['cobbler_url'],
+ allow_none=True)
+ credentials = self.os_installer['credentials']
+ remote.login(
+ credentials['username'], credentials['password'])
+ except Exception:
+ self._set_status(0,
+ "[%s]Error: Cannot login to Cobbler "
+ "with the tokens provided in the config file"
+ % self.NAME)
+ return (self.code, self.messages)
+
+ cobbler_settings = remote.get_settings()
+ if cobbler_settings['manage_dns'] == 0:
+ self.messages.append('[DNS]Info: DNS is not managed by Compass')
+ return (0, self.messages)
+ self.check_cobbler_dns_template()
+ print "[Done]"
+ self.check_dns_service()
+ print "[Done]"
+ if self.code == 1:
+ self.messages.append(
+ "[%s]Info: DNS health check has complated. "
+ "No problems found, all systems go." % self.NAME)
+ return (self.code, self.messages)
+
+ def check_cobbler_dns_template(self):
+ """Validates Cobbler's DNS template file."""
+
+ print "Checking DNS template......",
+ if os.path.exists("/etc/cobbler/named.template"):
+ var_map = {
+ "match_port": False,
+ "match_allow_query": False,
+ }
+ named_template = open("/etc/cobbler/named.template")
+ host_ip = socket.gethostbyname(socket.gethostname())
+ missing_query = []
+ for line in named_template.readlines():
+ if "listen-on port 53" in line and host_ip in line:
+ var_map["match_port"] = True
+
+ if "allow-query" in line:
+ for subnet in ["127.0.0.0/8"]:
+ if subnet not in line:
+ missing_query.append(subnet)
+
+ named_template.close()
+
+ if var_map["match_port"] is False:
+ self.messages.append(
+ "[%s]Error: named service port "
+ "and/or IP is misconfigured in "
+ "/etc/cobbler/named.template" % self.NAME)
+
+ if len(missing_query) != 0:
+ self.messages.append(
+ "[%s]Error: Missing allow_query values in "
+ "/etc/cobbler/named.template:%s" % (
+ self.NAME,
+ ', '.join(subnet for subnet in missing_query)))
+ else:
+ var_map["match_allow_query"] = True
+
+ fails = []
+ for var in var_map.keys():
+ if var_map[var] is False:
+ fails.append(var)
+
+ if len(fails) != 0:
+ self._set_status(
+ 0,
+ "[%s]Info: DNS template failed components: "
+ "%s" % (
+ self.NAME,
+ ' '.join(failed for failed in fails)))
+
+ else:
+ self._set_status(
+ 0,
+ "[%s]Error: named template file doesn't exist, "
+ "health check failed." % self.NAME)
+
+ return True
+
+ def check_dns_service(self):
+ """Checks if DNS is running on port 53."""
+
+ print "Checking DNS service......",
+ if 'named' not in commands.getoutput('ps -ef'):
+ self._set_status(
+ 0,
+ "[%s]Error: named service does not seem to be "
+ "running" % self.NAME)
+
+ if socket.getservbyport(53) != 'domain':
+ self._set_status(
+ 0,
+ "[%s]Error: domain service is not listening on port "
+ "53" % self.NAME)
+
+ return None