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ansible/system/open_iscsi

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#!/usr/bin/python
# -*- coding: utf-8 -*-
# (c) 2013, Serge van Ginderachter <serge@vanginderachter.be>
#
# 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: open_iscsi
author: Serge van Ginderachter
version_added: "1.3"
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:
required: false
aliases: [ip]
description:
- the ip address of the iscsi target
port:
required: false
default: 3260
description:
- the port on which the iscsi target process listens
target:
required: false
aliases: [name, targetname]
description:
- the iscsi target name
login:
required: false
choices: [true, false]
description:
- whether the target node should be connected
node_auth:
required: false
default: CHAP
description:
- discovery.sendtargets.auth.authmethod
node_user:
required: false
description:
- discovery.sendtargets.auth.username
node_pass:
required: false
description:
- discovery.sendtargets.auth.password
auto_node_startup:
aliases: [automatic]
required: false
choices: [true, false]
description:
- whether the target node should be automatically connected at startup
discover:
required: false
choices: [true, false]
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 iscsiadm discovery resets configurtion, like node.startup
to manual, hence combined with auto_node_startup=yes will allways return
a changed state.
show_nodes:
required: false
choices: [true, false]
description:
- whether the list of nodes in the persistent iscsi database should be
returned by the module
examples:
- description: perform a discovery on 10.1.2.3 and show available target
nodes
code: open_iscsi: show_nodes=yes discover=yes portal=10.1.2.3
- description: discover targets on portal and login to the one available
(only works if exactly one target is exported to the initiator)
code: open_iscsi: portal={{iscsi_target}} login=yes discover=yes
- description: connect to the named target, after updating the local
persistent database (cache)
code: login=yes target=iqn.1986-03.com.sun:02:f8c1f9e0-c3ec-ec84-c9c9-8bfb0cd5de3d
- description: discconnect from the cached named target
code: login=no target=iqn.1986-03.com.sun:02:f8c1f9e0-c3ec-ec84-c9c9-8bfb0cd5de3d"
'''
import glob
import time
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 err.find("o records found") != -1):
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
else:
module.fail_json(cmd=cmd, rc=rc, msg=err)
def target_login(module, target):
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)
(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)
if len(devices) == 0:
return None
else:
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(required=False, aliases=['ip']),
port = dict(required=False, default=3260),
target = dict(required=False, aliases=['name', 'targetname']),
node_auth = dict(required=False, default='CHAP'),
node_user = dict(required=False),
node_pass = dict(required=False),
# 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']
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)
# 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)
# this is magic, see lib/ansible/module_common.py
#<<INCLUDE_ANSIBLE_MODULE_COMMON>>
main()