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  • Committer: Edward Hope-Morley
  • Date: 2016-12-05 15:01:45 UTC
  • mfrom: (220.1.37 openstack-charm-testing)
  • Revision ID: edward.hope-morley@canonical.com-20161205150145-5xs44qcs5ifqsnl5
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bin/application-hostnames
 
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#!/usr/bin/env python
 
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import yaml
 
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import subprocess
 
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import optparse
 
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import sys
 
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usage = """Print hostnames for units participating in an application
 
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For example:
 
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  %prog nova-compute
 
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will print the hostnames of the units supporting the nova-compute application
 
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"""
 
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if __name__ == '__main__':
 
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    parser = optparse.OptionParser(usage)
 
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    (opts, args) = parser.parse_args()
 
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    if len(args) != 1:
 
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        parser.print_help()
 
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        sys.exit(1)
 
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    app_name = args[0]
 
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    app_status = yaml.load(subprocess.check_output(['juju', 'status',
 
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                                                    '--format=yaml',
 
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                                                     app_name]))
 
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    hostnames = []
 
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    for machine in app_status['machines']:
 
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        hostname = subprocess.check_output(['juju', 'ssh', machine,
 
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                                            'hostname']).strip()
 
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        hostnames.append(hostname)
 
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    print(' '.join(hostnames))