c376ee8655
To handle the case where the checked system has multiple IP Addresses and the network name to be used for liveness checking is not the same as the usual name used to identify the server in Monasca, an additional target_hostname parameter can be configured. It is the network hostname or IP Address to check instead of hostname. Add unit tests as well Change-Id: I33721764e64ef5079b26f78df84c94ed7a1009e7
68 lines
2.7 KiB
Python
68 lines
2.7 KiB
Python
# (C) Copyright 2015,2016 Hewlett Packard Enterprise Development LP
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import logging
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import monasca_setup.agent_config
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import monasca_setup.detection
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log = logging.getLogger(__name__)
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class HostAlive(monasca_setup.detection.ArgsPlugin):
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"""Setup an host_alive check according to the passed in args.
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Despite being a detection plugin, this plugin does no detection and
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will be a NOOP without arguments. Expects two space-separated
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arguments, 'hostname' and 'type,' where the former is a comma-separated
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list of hosts, and the latter can be either 'ssh' or 'ping'.
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Examples:
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monasca-setup -d hostalive -a "hostname=remotebox type=ping"
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monasca-setup -d hostalive -a "hostname=rb,rb2 target_hostname=,rb2-nic2 type=ssh"
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"""
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DEFAULT_PING_TIMEOUT = 1
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DEFAULT_SSH_TIMEOUT = 2
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DEFAULT_SSH_PORT = 22
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def _detect(self):
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"""Run detection, set self.available True if the service is detected.
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"""
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self.available = self._check_required_args(['hostname', 'type'])
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# Ideally, the arg would be called 'hostnames,' but leaving it
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# 'hostname' avoids breaking backward compatibility.
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def build_config(self):
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"""Build the config as a Plugins object and return.
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"""
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config = monasca_setup.agent_config.Plugins()
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log.info("\tEnabling {type} host check for {hostname}".format(**self.args))
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instances = []
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for hostname in self.args['hostname'].split(','):
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# Since the naming in the args and in the config don't match,
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# build_instance is only good for dimensions
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instance = self._build_instance([])
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instance.update({'name': "{0} {1}".format(hostname,
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self.args['type']),
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'host_name': hostname,
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'alive_test': self.args['type']})
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instances.append(instance)
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if 'target_hostname' in self.args:
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index = 0
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network_names_to_check = self.args['target_hostname'].split(',')
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for target_hostname in network_names_to_check:
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if target_hostname:
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if index >= len(instances):
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raise Exception('Too many target_hostname values')
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instance = instances[index]
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instance.update({'target_hostname': target_hostname})
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index += 1
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config['host_alive'] = {
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'init_config': {'ping_timeout': self.DEFAULT_PING_TIMEOUT,
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'ssh_timeout': self.DEFAULT_SSH_TIMEOUT,
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'ssh_port': self.DEFAULT_SSH_PORT},
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'instances': instances}
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return config
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