#!/usr/bin/python # -*- coding: utf-8 -*- # Copyright: (c) 2013, Serge van Ginderachter # GNU General Public License v3.0+ (see COPYING or https://www.gnu.org/licenses/gpl-3.0.txt) from __future__ import absolute_import, division, print_function __metaclass__ = type DOCUMENTATION = r''' --- module: open_iscsi author: - Serge van Ginderachter (@srvg) short_description: Manage iSCSI targets with Open-iSCSI description: - Discover targets on given portal, (dis)connect targets, mark targets to manually or auto start, return device nodes of connected targets. requirements: - open_iscsi library and tools (iscsiadm) options: portal: description: - The domain name or IP address of the iSCSI target. type: str aliases: [ ip ] port: description: - The port on which the iSCSI target process listens. type: str default: 3260 target: description: - The iSCSI target name. type: str aliases: [ name, targetname ] login: description: - Whether the target node should be connected. type: bool aliases: [ state ] node_auth: description: - The value for C(discovery.sendtargets.auth.authmethod). type: str default: CHAP node_user: description: - The value for C(discovery.sendtargets.auth.username). type: str node_pass: description: - The value for C(discovery.sendtargets.auth.password). type: str auto_node_startup: description: - Whether the target node should be automatically connected at startup. type: bool aliases: [ automatic ] discover: description: - Whether the list of target nodes on the portal should be (re)discovered and added to the persistent iSCSI database. - Keep in mind that C(iscsiadm) discovery resets configuration, like C(node.startup) to manual, hence combined with C(auto_node_startup=yes) will always return a changed state. type: bool show_nodes: description: - Whether the list of nodes in the persistent iSCSI database should be returned by the module. type: bool ''' EXAMPLES = r''' - name: Perform a discovery on sun.com and show available target nodes open_iscsi: show_nodes: yes discover: yes portal: sun.com - name: Perform a discovery on 10.1.2.3 and show available target nodes open_iscsi: show_nodes: yes discover: yes ip: 10.1.2.3 # NOTE: Only works if exactly one target is exported to the initiator - name: Discover targets on portal and login to the one available open_iscsi: portal: '{{ iscsi_target }}' login: yes discover: yes - name: Connect to the named target, after updating the local persistent database (cache) open_iscsi: login: yes target: iqn.1986-03.com.sun:02:f8c1f9e0-c3ec-ec84-c9c9-8bfb0cd5de3d - name: Disconnect from the cached named target open_iscsi: login: no target: iqn.1986-03.com.sun:02:f8c1f9e0-c3ec-ec84-c9c9-8bfb0cd5de3d ''' import glob import os import socket import time from ansible.module_utils.basic import AnsibleModule ISCSIADM = 'iscsiadm' def compare_nodelists(l1, l2): l1.sort() l2.sort() return l1 == l2 def iscsi_get_cached_nodes(module, portal=None): cmd = '%s --mode node' % iscsiadm_cmd (rc, out, err) = module.run_command(cmd) if rc == 0: lines = out.splitlines() nodes = [] for line in lines: # line format is "ip:port,target_portal_group_tag targetname" parts = line.split() if len(parts) > 2: module.fail_json(msg='error parsing output', cmd=cmd) target = parts[1] parts = parts[0].split(':') target_portal = parts[0] if portal is None or portal == target_portal: nodes.append(target) # older versions of scsiadm don't have nice return codes # for newer versions see iscsiadm(8); also usr/iscsiadm.c for details # err can contain [N|n]o records... elif rc == 21 or (rc == 255 and "o records found" in err): nodes = [] else: module.fail_json(cmd=cmd, rc=rc, msg=err) return nodes def iscsi_discover(module, portal, port): cmd = '%s --mode discovery --type sendtargets --portal %s:%s' % (iscsiadm_cmd, portal, port) (rc, out, err) = module.run_command(cmd) if rc > 0: module.fail_json(cmd=cmd, rc=rc, msg=err) def target_loggedon(module, target): cmd = '%s --mode session' % iscsiadm_cmd (rc, out, err) = module.run_command(cmd) if rc == 0: return target in out elif rc == 21: return False else: module.fail_json(cmd=cmd, rc=rc, msg=err) def target_login(module, target, portal=None, port=None): node_auth = module.params['node_auth'] node_user = module.params['node_user'] node_pass = module.params['node_pass'] if node_user: params = [('node.session.auth.authmethod', node_auth), ('node.session.auth.username', node_user), ('node.session.auth.password', node_pass)] for (name, value) in params: cmd = '%s --mode node --targetname %s --op=update --name %s --value %s' % (iscsiadm_cmd, target, name, value) (rc, out, err) = module.run_command(cmd) if rc > 0: module.fail_json(cmd=cmd, rc=rc, msg=err) cmd = '%s --mode node --targetname %s --login' % (iscsiadm_cmd, target) if portal is not None and port is not None: cmd += ' --portal %s:%s' % (portal, port) (rc, out, err) = module.run_command(cmd) if rc > 0: module.fail_json(cmd=cmd, rc=rc, msg=err) def target_logout(module, target): cmd = '%s --mode node --targetname %s --logout' % (iscsiadm_cmd, target) (rc, out, err) = module.run_command(cmd) if rc > 0: module.fail_json(cmd=cmd, rc=rc, msg=err) def target_device_node(module, target): # if anyone know a better way to find out which devicenodes get created for # a given target... devices = glob.glob('/dev/disk/by-path/*%s*' % target) devdisks = [] for dev in devices: # exclude partitions if "-part" not in dev: devdisk = os.path.realpath(dev) # only add once (multi-path?) if devdisk not in devdisks: devdisks.append(devdisk) return devdisks def target_isauto(module, target): cmd = '%s --mode node --targetname %s' % (iscsiadm_cmd, target) (rc, out, err) = module.run_command(cmd) if rc == 0: lines = out.splitlines() for line in lines: if 'node.startup' in line: return 'automatic' in line return False else: module.fail_json(cmd=cmd, rc=rc, msg=err) def target_setauto(module, target): cmd = '%s --mode node --targetname %s --op=update --name node.startup --value automatic' % (iscsiadm_cmd, target) (rc, out, err) = module.run_command(cmd) if rc > 0: module.fail_json(cmd=cmd, rc=rc, msg=err) def target_setmanual(module, target): cmd = '%s --mode node --targetname %s --op=update --name node.startup --value manual' % (iscsiadm_cmd, target) (rc, out, err) = module.run_command(cmd) if rc > 0: module.fail_json(cmd=cmd, rc=rc, msg=err) def main(): # load ansible module object module = AnsibleModule( argument_spec=dict( # target portal=dict(type='str', aliases=['ip']), port=dict(type='str', default='3260'), target=dict(type='str', aliases=['name', 'targetname']), node_auth=dict(type='str', default='CHAP'), node_user=dict(type='str'), node_pass=dict(type='str', no_log=True), # actions login=dict(type='bool', aliases=['state']), auto_node_startup=dict(type='bool', aliases=['automatic']), discover=dict(type='bool', default=False), show_nodes=dict(type='bool', default=False), ), required_together=[['discover_user', 'discover_pass'], ['node_user', 'node_pass']], supports_check_mode=True, ) global iscsiadm_cmd iscsiadm_cmd = module.get_bin_path('iscsiadm', required=True) # parameters portal = module.params['portal'] if portal: try: portal = socket.getaddrinfo(portal, None)[0][4][0] except socket.gaierror: module.fail_json(msg="Portal address is incorrect") target = module.params['target'] port = module.params['port'] login = module.params['login'] automatic = module.params['auto_node_startup'] discover = module.params['discover'] show_nodes = module.params['show_nodes'] check = module.check_mode cached = iscsi_get_cached_nodes(module, portal) # return json dict result = {} result['changed'] = False if discover: if portal is None: module.fail_json(msg="Need to specify at least the portal (ip) to discover") elif check: nodes = cached else: iscsi_discover(module, portal, port) nodes = iscsi_get_cached_nodes(module, portal) if not compare_nodelists(cached, nodes): result['changed'] |= True result['cache_updated'] = True else: nodes = cached if login is not None or automatic is not None: if target is None: if len(nodes) > 1: module.fail_json(msg="Need to specify a target") else: target = nodes[0] else: # check given target is in cache check_target = False for node in nodes: if node == target: check_target = True break if not check_target: module.fail_json(msg="Specified target not found") if show_nodes: result['nodes'] = nodes if login is not None: loggedon = target_loggedon(module, target) if (login and loggedon) or (not login and not loggedon): result['changed'] |= False if login: result['devicenodes'] = target_device_node(module, target) elif not check: if login: target_login(module, target, portal, port) # give udev some time time.sleep(1) result['devicenodes'] = target_device_node(module, target) else: target_logout(module, target) result['changed'] |= True result['connection_changed'] = True else: result['changed'] |= True result['connection_changed'] = True if automatic is not None: isauto = target_isauto(module, target) if (automatic and isauto) or (not automatic and not isauto): result['changed'] |= False result['automatic_changed'] = False elif not check: if automatic: target_setauto(module, target) else: target_setmanual(module, target) result['changed'] |= True result['automatic_changed'] = True else: result['changed'] |= True result['automatic_changed'] = True module.exit_json(**result) if __name__ == '__main__': main()