#!/usr/bin/python # -*- coding: utf-8 -*- # (c) 2012, Michael DeHaan # # 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 . DOCUMENTATION = ''' --- module: service author: Michael DeHaan version_added: 0.1 short_description: Manage services. description: - Controls services on remote hosts. options: name: required: true description: - Name of the service. state: required: false choices: [ started, stopped, restarted, reloaded ] description: - I(started), I(stopped), I(reloaded), I(restarted). I(Started)/I(stopped) are idempotent actions that will not run commands unless necessary. I(restarted) will always bounce the service. I(reloaded) will always reload. pattern: required: false version_added: "0.7" description: - If the service does not respond to the status command, name a substring to look for as would be found in the output of the I(ps) command as a stand-in for a status result. If the string is found, the service will be assumed to be running. enabled: required: false choices: [ "yes", "no" ] description: - Whether the service should start on boot. examples: - code: "service: name=httpd state=started" description: Example action from Ansible Playbooks - code: "service: name=httpd state=stopped" description: Example action from Ansible Playbooks - code: "service: name=httpd state=restarted" description: Example action from Ansible Playbooks - code: "service: name=httpd state=reloaded" description: Example action from Ansible Playbooks - code: "service: name=foo pattern=/usr/bin/foo state=started" description: Example action from Ansible Playbooks ''' import platform SERVICE = None CHKCONFIG = None INITCTL = None PS_OPTIONS = 'auxww' def _find_binaries(m): # list of possible paths for service/chkconfig binaries # with the most probable first global SERVICE global CHKCONFIG global INITCTL paths = ['/sbin', '/usr/sbin', '/bin', '/usr/bin'] binaries = [ 'service', 'chkconfig', 'update-rc.d', 'initctl', 'systemctl'] location = dict() for binary in binaries: location[binary] = None for binary in binaries: location[binary] = m.get_bin_path(binary) if location.get('systemctl', None): CHKCONFIG = location['systemctl'] elif location.get('chkconfig', None): CHKCONFIG = location['chkconfig'] elif location.get('update-rc.d', None): CHKCONFIG = location['update-rc.d'] else: m.fail_json(msg='unable to find chkconfig or update-rc.d binary') if location.get('service', None): SERVICE = location['service'] else: m.fail_json(msg='unable to find service binary') if location.get('initctl', None): INITCTL = location['initctl'] else: INITCTL = None def _get_service_status(name, pattern): rc, status_stdout, status_stderr = _run("%s %s status" % (SERVICE, name)) # set the running state to None because we don't know it yet running = None # If pattern is provided, search for that # before checking initctl, service output, and other tricks if pattern is not None: psbin = '/bin/ps' if not os.path.exists(psbin): if os.path.exists('/usr/bin/ps'): psbin = '/usr/bin/ps' else: psbin = None if psbin is not None: (rc, psout, pserr) = _run('%s %s' % (psbin, PS_OPTIONS)) # If rc is 0, set running as appropriate # If ps command fails, fall back to other means. if rc == 0: running = False lines = psout.split("\n") for line in lines: if pattern in line and not "pattern=" in line: # so as to not confuse ./hacking/test-module running = True break # Check if we got upstart on the system and then the job state if INITCTL != None and running is None: # check the job status by upstart response initctl_rc, initctl_status_stdout, initctl_status_stderr = _run("%s status %s" % (INITCTL, name)) if initctl_status_stdout.find("stop/waiting") != -1: running = False elif initctl_status_stdout.find("start/running") != -1: running = True # if the job status is still not known check it by response code if running == None: if rc == 3: running = False if rc == 2: running = False elif rc == 0: running = True # if the job status is still not known check it by status output keywords if running == None: # first tranform the status output that could irritate keyword matching cleanout = status_stdout.lower().replace(name.lower(), '') if "stop" in cleanout: running = False elif "run" in cleanout and "not" in cleanout: running = False elif "run" in cleanout and "not" not in cleanout: running = True elif "start" in cleanout and "not" not in cleanout: running = True elif 'could not access pid file' in cleanout: running = False elif 'is dead and pid file exists' in cleanout: running = False elif 'dead but subsys locked' in cleanout: running = False elif 'dead but pid file exists' in cleanout: running = False # if the job status is still not known check it by special conditions if running == None: if name == 'iptables' and status_stdout.find("ACCEPT") != -1: # iptables status command output is lame # TODO: lookup if we can use a return code for this instead? running = True return running def _run(cmd): # returns (rc, stdout, stderr) from shell command process = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE, shell=True) stdout, stderr = process.communicate() return (process.returncode, stdout, stderr) def _do_enable(name, enable): # we change argument depending on real binary used # update-rc.d wants enable/disable while # chkconfig wants on/off # also, systemctl needs the arguments reversed if enable: on_off = "on" enable_disable = "enable" else: on_off = "off" enable_disable = "disable" if CHKCONFIG.endswith("update-rc.d"): args = (CHKCONFIG, name, enable_disable) elif CHKCONFIG.endswith("systemctl"): args = (CHKCONFIG, enable_disable, name + ".service") else: args = (CHKCONFIG, name, on_off) if enable is not None: rc, stdout, stderr = _run("%s %s %s" % args) return rc, stdout, stderr def main(): module = AnsibleModule( argument_spec = dict( name = dict(required=True), state = dict(choices=['running', 'started', 'stopped', 'restarted', 'reloaded']), pattern = dict(required=False, default=None), enabled = dict(choices=BOOLEANS) ) ) name = module.params['name'] state = module.params['state'] pattern = module.params['pattern'] enable = module.boolean(module.params.get('enabled', None)) # Set PS options here if 'ps auxww' will not work on # target platform if platform.system() == 'SunOS': global PS_OPTIONS PS_OPTIONS = '-ef' # =========================================== # find binaries locations on minion _find_binaries(module) # =========================================== # get service status running = _get_service_status(name, pattern) # =========================================== # Some common variables changed = False rc = 0 err = '' out = '' if module.params['enabled']: rc_enable, out_enable, err_enable = _do_enable(name, enable) rc += rc_enable out += out_enable err += err_enable if state and running == None: module.fail_json(msg="failed determining the current service state => state stays unchanged", changed=False) elif state: # a state change command has been requested # =========================================== # determine if we are going to change anything if not running and state in ["started", "running"]: changed = True elif running and state in ["stopped","reloaded"]: changed = True elif state == "restarted": changed = True # =========================================== # run change commands if we need to if changed: if state in ['started', 'running']: rc_state, stdout, stderr = _run("%s %s start" % (SERVICE, name)) elif state == 'stopped': rc_state, stdout, stderr = _run("%s %s stop" % (SERVICE, name)) elif state == 'reloaded': rc_state, stdout, stderr = _run("%s %s reload" % (SERVICE, name)) elif state == 'restarted': rc1, stdout1, stderr1 = _run("%s %s stop" % (SERVICE, name)) rc2, stdout2, stderr2 = _run("%s %s start" % (SERVICE, name)) if rc1 != 0 and rc2 == 0: rc_state = rc + rc2 stdout = stdout2 stderr = stderr2 else: rc_state = rc + rc1 + rc2 stdout = stdout1 + stdout2 stderr = stderr1 + stderr2 out += stdout err += stderr rc = rc + rc_state if rc != 0: module.fail_json(msg=err) result = {"changed": changed} if module.params['enabled']: result['enabled'] = module.params['enabled'] if state: result['state'] = state rc, stdout, stderr = _run("%s %s status" % (SERVICE, name)) module.exit_json(**result) # this is magic, see lib/ansible/module_common.py #<> main()