09c9fe119e
this makes some changes to the cc_resolv_conf to make its generate_resolv_conf method more easily callable (for future test). Also sets it up so that 'options' is always defined when the template is rendered.
117 lines
3.8 KiB
Python
117 lines
3.8 KiB
Python
# vi: ts=4 expandtab
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#
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# Copyright (C) 2013 Craig Tracey
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# Copyright (C) 2013 Hewlett-Packard Development Company, L.P.
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#
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# Author: Craig Tracey <craigtracey@gmail.com>
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# Author: Juerg Haefliger <juerg.haefliger@hp.com>
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License version 3, as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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# Note:
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# This module is intended to manage resolv.conf in environments where
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# early configuration of resolv.conf is necessary for further
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# bootstrapping and/or where configuration management such as puppet or
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# chef own dns configuration. As Debian/Ubuntu will, by default, utilize
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# resovlconf, and similarly RedHat will use sysconfig, this module is
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# likely to be of little use unless those are configured correctly.
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#
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# For RedHat with sysconfig, be sure to set PEERDNS=no for all DHCP
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# enabled NICs. And, in Ubuntu/Debian it is recommended that DNS
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# be configured via the standard /etc/network/interfaces configuration
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# file.
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#
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#
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# Usage Example:
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#
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# #cloud-config
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# manage_resolv_conf: true
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#
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# resolv_conf:
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# nameservers: ['8.8.4.4', '8.8.8.8']
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# searchdomains:
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# - foo.example.com
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# - bar.example.com
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# domain: example.com
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# options:
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# rotate: true
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# timeout: 1
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#
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from cloudinit import log as logging
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from cloudinit.settings import PER_INSTANCE
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from cloudinit import templater
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from cloudinit import util
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LOG = logging.getLogger(__name__)
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frequency = PER_INSTANCE
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distros = ['fedora', 'rhel', 'sles']
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def generate_resolv_conf(template_fn, params, target_fname="/etc/resolv.conf"):
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flags = []
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false_flags = []
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if 'options' in params:
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for key, val in params['options'].iteritems():
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if type(val) == bool:
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if val:
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flags.append(key)
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else:
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false_flags.append(key)
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for flag in flags + false_flags:
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del params['options'][flag]
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if not params.get('options'):
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params['options'] = {}
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params['flags'] = flags
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LOG.debug("Writing resolv.conf from template %s" % template_fn)
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templater.render_to_file(template_fn, target_fname, params)
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def handle(name, cfg, cloud, log, _args):
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"""
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Handler for resolv.conf
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@param name: The module name "resolv-conf" from cloud.cfg
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@param cfg: A nested dict containing the entire cloud config contents.
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@param cloud: The L{CloudInit} object in use.
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@param log: Pre-initialized Python logger object to use for logging.
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@param args: Any module arguments from cloud.cfg
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"""
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if "manage_resolv_conf" not in cfg:
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log.debug(("Skipping module named %s,"
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" no 'manage_resolv_conf' key in configuration"), name)
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return
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if not util.get_cfg_option_bool(cfg, "manage_resolv_conf", False):
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log.debug(("Skipping module named %s,"
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" 'manage_resolv_conf' present but set to False"), name)
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return
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if "resolv_conf" not in cfg:
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log.warn("manage_resolv_conf True but no parameters provided!")
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template_fn = cloud.get_template_filename('resolv.conf')
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if not template_fn:
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log.warn("No template found, not rendering /etc/resolv.conf")
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return
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generate_resolv_conf(template_fn=template_fn, params=cfg["resolv_conf"])
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return
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