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