#!/usr/bin/python # -*- coding: utf-8 -*- # (c) 2013, Hiroaki Nakamura <hnakamur@gmail.com> # # This file is part of Ansible # # Ansible is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # Ansible is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with Ansible. If not, see <http://www.gnu.org/licenses/>. DOCUMENTATION = ''' --- module: hostname author: Hiroaki Nakamura version_added: "1.4" short_description: Manage hostname requirements: [ hostname ] description: - Set system's hostname - Currently implemented on only Debian, Ubuntu, RedHat and CentOS. options: name: required: true description: - Name of the host ''' EXAMPLES = ''' - hostname: name=web01 ''' class UnimplementedStrategy(object): def __init__(self, module): self.module = module def get_current_hostname(self): self.unimplemented_error() def set_current_hostname(self, name): self.unimplemented_error() def get_permanent_hostname(self): self.unimplemented_error() def set_permanent_hostname(self, name): self.unimplemented_error() def unimplemented_error(self): platform = get_platform() distribution = get_distribution() if distribution is not None: msg_platform = '%s (%s)' % (platform, distribution) else: msg_platform = platform self.module.fail_json( msg='hostname module cannot be used on platform %s' % msg_platform) class Hostname(object): """ This is a generic Hostname manipulation class that is subclassed based on platform. A subclass may wish to set different strategy instance to self.strategy. All subclasses MUST define platform and distribution (which may be None). """ platform = 'Generic' distribution = None strategy_class = UnimplementedStrategy def __new__(cls, *args, **kwargs): return load_platform_subclass(Hostname, args, kwargs) def __init__(self, module): self.module = module self.name = module.params['name'] self.strategy = self.strategy_class(module) def get_current_hostname(self): return self.strategy.get_current_hostname() def set_current_hostname(self, name): self.strategy.set_current_hostname(name) def get_permanent_hostname(self): return self.strategy.get_permanent_hostname() def set_permanent_hostname(self, name): self.strategy.set_permanent_hostname(name) class GenericStrategy(object): """ This is a generic Hostname manipulation strategy class. A subclass may wish to override some or all of these methods. - get_current_hostname() - get_permanent_hostname() - set_current_hostname(name) - set_permanent_hostname(name) """ def __init__(self, module): self.module = module HOSTNAME_CMD = '/bin/hostname' def get_current_hostname(self): cmd = [self.HOSTNAME_CMD] rc, out, err = self.module.run_command(cmd) if rc != 0: self.module.fail_json(msg="Command failed rc=%d, out=%s, err=%s" % (rc, out, err)) return out.strip() def set_current_hostname(self, name): cmd = [self.HOSTNAME_CMD, name] rc, out, err = self.module.run_command(cmd) if rc != 0: self.module.fail_json(msg="Command failed rc=%d, out=%s, err=%s" % (rc, out, err)) def get_permanent_hostname(self): return None def set_permanent_hostname(self, name): pass # =========================================== class DebianStrategy(GenericStrategy): """ This is a Debian family Hostname manipulation strategy class - it edits the /etc/hostname file. """ HOSTNAME_FILE = '/etc/hostname' def get_permanent_hostname(self): if not os.path.isfile(self.HOSTNAME_FILE): try: open(self.HOSTNAME_FILE, "a").write("") except IOError, err: self.module.fail_json(msg="failed to write file: %s" % str(err)) try: f = open(self.HOSTNAME_FILE) try: return f.read().strip() finally: f.close() except Exception, err: self.module.fail_json(msg="failed to read hostname: %s" % str(err)) def set_permanent_hostname(self, name): try: f = open(self.HOSTNAME_FILE, 'w+') try: f.write("%s\n" % name) finally: f.close() except Exception, err: self.module.fail_json(msg="failed to update hostname: %s" % str(err)) class DebianHostname(Hostname): platform = 'Linux' distribution = 'Debian' strategy_class = DebianStrategy class UbuntuHostname(Hostname): platform = 'Linux' distribution = 'Ubuntu' strategy_class = DebianStrategy # =========================================== class RedHatStrategy(GenericStrategy): """ This is a Redhat Hostname strategy class - it edits the /etc/sysconfig/network file. """ NETWORK_FILE = '/etc/sysconfig/network' def get_permanent_hostname(self): try: f = open(self.NETWORK_FILE, 'rb') try: for line in f.readlines(): if line.startswith('HOSTNAME'): k, v = line.split('=') return v.strip() finally: f.close() except Exception, err: self.module.fail_json(msg="failed to read hostname: %s" % str(err)) def set_permanent_hostname(self, name): try: lines = [] found = False f = open(self.NETWORK_FILE, 'rb') try: for line in f.readlines(): if line.startswith('HOSTNAME'): lines.append("HOSTNAME=%s\n" % name) found = True else: lines.append(line) finally: f.close() if not found: lines.append("HOSTNAME=%s\n" % name) f = open(self.NETWORK_FILE, 'w+') try: f.writelines(lines) finally: f.close() except Exception, err: self.module.fail_json(msg="failed to update hostname: %s" % str(err)) class RedHat5Hostname(Hostname): platform = 'Linux' distribution = 'Redhat' strategy_class = RedHatStrategy class RedHatServerHostname(Hostname): platform = 'Linux' distribution = 'Red hat enterprise linux server' strategy_class = RedHatStrategy class RedHatWorkstationHostname(Hostname): platform = 'Linux' distribution = 'Red hat enterprise linux workstation' strategy_class = RedHatStrategy class CentOSHostname(Hostname): platform = 'Linux' distribution = 'Centos' strategy_class = RedHatStrategy class AmazonLinuxHostname(Hostname): platform = 'Linux' distribution = 'Amazon' strategy_class = RedHatStrategy class ScientificLinuxHostname(Hostname): platform = 'Linux' distribution = 'Scientific' strategy_class = RedHatStrategy # =========================================== class FedoraStrategy(GenericStrategy): """ This is a Fedora family Hostname manipulation strategy class - it uses the hostnamectl command. """ def get_current_hostname(self): cmd = ['hostname'] rc, out, err = self.module.run_command(cmd) if rc != 0: self.module.fail_json(msg="Command failed rc=%d, out=%s, err=%s" % (rc, out, err)) return out.strip() def set_current_hostname(self, name): cmd = ['hostnamectl', '--transient', 'set-hostname', name] rc, out, err = self.module.run_command(cmd) if rc != 0: self.module.fail_json(msg="Command failed rc=%d, out=%s, err=%s" % (rc, out, err)) def get_permanent_hostname(self): cmd = 'hostnamectl status | awk \'/^ *Static hostname:/{printf("%s", $3)}\'' rc, out, err = self.module.run_command(cmd) if rc != 0: self.module.fail_json(msg="Command failed rc=%d, out=%s, err=%s" % (rc, out, err)) return out def set_permanent_hostname(self, name): cmd = ['hostnamectl', '--pretty', 'set-hostname', name] rc, out, err = self.module.run_command(cmd) if rc != 0: self.module.fail_json(msg="Command failed rc=%d, out=%s, err=%s" % (rc, out, err)) cmd = ['hostnamectl', '--static', 'set-hostname', name] rc, out, err = self.module.run_command(cmd) if rc != 0: self.module.fail_json(msg="Command failed rc=%d, out=%s, err=%s" % (rc, out, err)) class FedoraHostname(Hostname): platform = 'Linux' distribution = 'Fedora' strategy_class = FedoraStrategy class OpenSUSEHostname(Hostname): platform = 'Linux' distribution = 'Opensuse ' strategy_class = FedoraStrategy class ArchHostname(Hostname): platform = 'Linux' distribution = 'Arch' strategy_class = FedoraStrategy # =========================================== def main(): module = AnsibleModule( argument_spec = dict( name=dict(required=True, type='str') ) ) hostname = Hostname(module) changed = False name = module.params['name'] current_name = hostname.get_current_hostname() if current_name != name: hostname.set_current_hostname(name) changed = True permanent_name = hostname.get_permanent_hostname() if permanent_name != name: hostname.set_permanent_hostname(name) changed = True module.exit_json(changed=changed, name=name) # import module snippets from ansible.module_utils.basic import * main()