mirror of
https://github.com/ceph/ceph
synced 2024-12-25 12:54:16 +00:00
103 lines
3.6 KiB
Python
103 lines
3.6 KiB
Python
"""
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Task for dnsmasq configuration
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"""
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import contextlib
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import logging
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from teuthology import misc
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from teuthology.exceptions import ConfigError
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from teuthology import contextutil
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from util import get_remote_for_role
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log = logging.getLogger(__name__)
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@contextlib.contextmanager
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def setup_dnsmasq(remote, cnames):
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""" configure dnsmasq on the given remote, adding each cname given """
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log.info('Configuring dnsmasq on remote %s..', remote.name)
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# back up existing resolv.conf
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resolv_conf = misc.get_file(remote, '/etc/resolv.conf')
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# point resolv.conf to local dnsmasq
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misc.sudo_write_file(remote, '/etc/resolv.conf',
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"nameserver 127.0.0.1\n")
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# add address entries to /etc/dnsmasq.d/ceph
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dnsmasq = "server=8.8.8.8\nserver=8.8.4.4\n"
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address_template = "address=/{cname}/{ip_address}\n"
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for cname, ip_address in cnames.iteritems():
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dnsmasq += address_template.format(cname=cname, ip_address=ip_address)
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misc.sudo_write_file(remote, '/etc/dnsmasq.d/ceph', dnsmasq)
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remote.run(args=['cat', '/etc/dnsmasq.d/ceph'])
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# restart dnsmasq
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remote.run(args=['sudo', 'systemctl', 'restart', 'dnsmasq'])
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remote.run(args=['sudo', 'systemctl', 'status', 'dnsmasq'])
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# verify dns name is set
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remote.run(args=['ping', '-c', '4', cnames.keys()[0]])
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yield
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log.info('Removing dnsmasq configuration from remote %s..', remote.name)
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# restore resolv.conf
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misc.sudo_write_file(remote, '/etc/resolv.conf', resolv_conf)
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# restart dnsmasq
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remote.run(args=['sudo', 'systemctl', 'restart', 'dnsmasq'])
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@contextlib.contextmanager
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def task(ctx, config):
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"""
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Configures dnsmasq to add cnames for teuthology remotes. The task expects a
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dictionary, where each key is a role. If all cnames for that role use the
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same address as that role, the cnames can be given as a list. For example,
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this entry configures dnsmasq on the remote associated with client.0, adding
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two cnames for the ip address associated with client.0:
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- dnsmasq:
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client.0:
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- client0.example.com
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- c0.example.com
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If the addresses do not all match the given role, a dictionary can be given
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to specify the ip address by its target role. For example:
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- dnsmasq:
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client.0:
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client.0.example.com: client.0
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client.1.example.com: client.1
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"""
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# apply overrides
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overrides = config.get('overrides', {})
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misc.deep_merge(config, overrides.get('dnsmasq', {}))
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# multiple roles may map to the same remote, so collect names by remote
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remote_names = {}
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for role, cnames in config.iteritems():
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remote = get_remote_for_role(ctx, role)
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if remote is None:
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raise ConfigError('no remote for role %s' % role)
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names = remote_names.get(remote, {})
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if isinstance(cnames, list):
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# when given a list of cnames, point to local ip
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for cname in cnames:
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names[cname] = remote.ip_address
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elif isinstance(cnames, dict):
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# when given a dict, look up the remote ip for each
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for cname, client in cnames.iteritems():
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r = get_remote_for_role(ctx, client)
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if r is None:
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raise ConfigError('no remote for role %s' % client)
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names[cname] = r.ip_address
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remote_names[remote] = names
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# run a subtask for each unique remote
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subtasks = []
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for remote, cnames in remote_names.iteritems():
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subtasks.extend([ lambda r=remote, cn=cnames: setup_dnsmasq(r, cn) ])
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with contextutil.nested(*subtasks):
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yield
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