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# Copyright (C) 2011 Canonical Ltd. # Copyright (C) 2012, 2013 Hewlett-Packard Development Company, L.P. # # Author: Scott Moser <scott.moser@canonical.com> # Author: Juerg Haefliger <juerg.haefliger@hp.com> # # This file is part of cloud-init. See LICENSE file for license information. """ Set Hostname ------------ **Summary:** set hostname and fqdn This module handles setting the system hostname and fqdn. If ``preserve_hostname`` is set, then the hostname will not be altered. A hostname and fqdn can be provided by specifying a full domain name under the ``fqdn`` key. Alternatively, a hostname can be specified using the ``hostname`` key, and the fqdn of the cloud wil be used. If a fqdn specified with the ``hostname`` key, it will be handled properly, although it is better to use the ``fqdn`` config key. If both ``fqdn`` and ``hostname`` are set, ``fqdn`` will be used. **Internal name:** ``cc_set_hostname`` **Module frequency:** per instance **Supported distros:** all **Config keys**:: preserve_hostname: <true/false> fqdn: <fqdn> hostname: <fqdn/hostname> """ import os from cloudinit.atomic_helper import write_json from cloudinit import util class SetHostnameError(Exception): """Raised when the distro runs into an exception when setting hostname. This may happen if we attempt to set the hostname early in cloud-init's init-local timeframe as certain services may not be running yet. """ pass def handle(name, cfg, cloud, log, _args): if util.get_cfg_option_bool(cfg, "preserve_hostname", False): log.debug(("Configuration option 'preserve_hostname' is set," " not setting the hostname in module %s"), name) return (hostname, fqdn) = util.get_hostname_fqdn(cfg, cloud) # Check for previous successful invocation of set-hostname # set-hostname artifact file accounts for both hostname and fqdn # deltas. As such, it's format is different than cc_update_hostname's # previous-hostname file which only contains the base hostname. # TODO consolidate previous-hostname and set-hostname artifact files and # distro._read_hostname implementation so we only validate one artifact. prev_fn = os.path.join(cloud.get_cpath('data'), "set-hostname") prev_hostname = {} if os.path.exists(prev_fn): prev_hostname = util.load_json(util.load_file(prev_fn)) hostname_changed = (hostname != prev_hostname.get('hostname') or fqdn != prev_hostname.get('fqdn')) if not hostname_changed: log.debug('No hostname changes. Skipping set-hostname') return log.debug("Setting the hostname to %s (%s)", fqdn, hostname) try: cloud.distro.set_hostname(hostname, fqdn) except Exception as e: msg = "Failed to set the hostname to %s (%s)" % (fqdn, hostname) util.logexc(log, msg) raise SetHostnameError("%s: %s" % (msg, e)) write_json(prev_fn, {'hostname': hostname, 'fqdn': fqdn}) # vi: ts=4 expandtab
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