xenserver/etc_xapi.d_plugins_openvswitch-cfg-update

   1 #!/usr/bin/env python
   2 #
   3 # xapi plugin script to update the cache of configuration items in the
   4 # ovs-vswitchd configuration that are managed in the xapi database when
   5 # integrated with Citrix management tools.
   6
   7 # Copyright (C) 2009, 2010, 2011 Nicira Networks, Inc.
   8 #
   9 # Licensed under the Apache License, Version 2.0 (the "License");
  10 # you may not use this file except in compliance with the License.
  11 # You may obtain a copy of the License at:
  12 #
  13 #     http://www.apache.org/licenses/LICENSE-2.0
  14 #
  15 # Unless required by applicable law or agreed to in writing, software
  16 # distributed under the License is distributed on an "AS IS" BASIS,
  17 # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  18 # See the License for the specific language governing permissions and
  19 # limitations under the License.
  20
  21 # TBD: - error handling needs to be improved.  Currently this can leave
  22 # TBD:   the system in a bad state if anything goes wrong.
  23
  24 import XenAPIPlugin
  25 import XenAPI
  26 import os
  27 import subprocess
  28 import syslog
  29
  30 vsctl="/usr/bin/ovs-vsctl"
  31 cacert_filename="/etc/openvswitch/vswitchd.cacert"
  32
  33 # Delete the CA certificate, so that we go back to boot-strapping mode
  34 def delete_cacert():
  35     try:
  36         os.remove(cacert_filename)
  37     except OSError:
  38         # Ignore error if file doesn't exist
  39         pass
  40
  41 def update(session, args):
  42     # Refresh bridge network UUIDs in case this host joined or left a pool.
  43     script = "/opt/xensource/libexec/interface-reconfigure"
  44     try:
  45         retval = subprocess.call([script, "rewrite"])
  46         if retval != 0:
  47             syslog.syslog("%s exited with status %d" % (script, retval))
  48     except OSError, e:
  49         syslog.syslog("%s: failed to execute (%s)" % (script, e.strerror))
  50
  51     pools = session.xenapi.pool.get_all()
  52     # We assume there is only ever one pool...
  53     if len(pools) == 0:
  54         raise XenAPIPlugin.Failure("NO_POOL_FOR_HOST", [])
  55     if len(pools) > 1:
  56         raise XenAPIPlugin.Failure("MORE_THAN_ONE_POOL_FOR_HOST", [])
  57     pool = session.xenapi.pool.get_record(pools[0])
  58     try:
  59         try:
  60             controller = pool["vswitch_controller"]
  61         except KeyError:
  62             # On systems older than XenServer 5.6.0, we needed to store
  63             # the key in "other_config".
  64             controller = pool["other_config"]["vSwitchController"]
  65     except KeyError, e:
  66         controller = ""
  67     ret_str = ""
  68     currentController = vswitchCurrentController()
  69     if controller == "" and currentController != "":
  70         delete_cacert()
  71         try:
  72             emergency_reset(session, None)
  73         except:
  74             pass
  75         removeControllerCfg()
  76         ret_str += "Successfully removed controller config.  "
  77     elif controller != currentController:
  78         delete_cacert()
  79         try:
  80             emergency_reset(session, None)
  81         except:
  82             pass
  83         setControllerCfg(controller)
  84         ret_str += "Successfully set controller to %s.  " % controller
  85
  86     try:
  87         pool_fail_mode = pool["other_config"]["vswitch-controller-fail-mode"]
  88     except KeyError, e:
  89         pool_fail_mode = None
  90
  91     bton = {}
  92
  93     for n in session.xenapi.network.get_all():
  94         rec = session.xenapi.network.get_record(n)
  95         try:
  96             bton[rec['bridge']] = rec
  97         except KeyError:
  98             pass
  99
 100     fail_mode_changed = False
 101     for bridge in vswitchCfgQuery(['list-br']).split():
 102         bridge = vswitchCfgQuery(['br-to-parent', bridge])
 103         bridge_fail_mode = vswitchCfgQuery(["get", "Bridge",
 104             bridge, "fail_mode"]).strip('[]"')
 105
 106         try:
 107             fail_mode = bton[bridge]["other_config"]["vswitch-controller-fail-mode"]
 108         except KeyError, e:
 109             fail_mode = None
 110
 111         if fail_mode not in ['secure', 'standalone']:
 112             fail_mode = pool_fail_mode
 113
 114         if fail_mode != 'secure':
 115             fail_mode = 'standalone'
 116
 117         if bridge_fail_mode != fail_mode:
 118             vswitchCfgMod(['--', 'set', 'Bridge', bridge,
 119                 "fail_mode=%s" % fail_mode])
 120             fail_mode_changed = True
 121
 122     if fail_mode_changed:
 123         ret_str += "Updated fail_mode.  "
 124
 125     if ret_str != '':
 126         return ret_str
 127     else:
 128         return "No change to configuration"
 129
 130 def vswitchCurrentController():
 131     controller = vswitchCfgQuery(["get", "Open_vSwitch",
 132                                   ".", "managers"]).strip('[]"')
 133     if controller == "":
 134         return controller
 135     if len(controller) < 4 or controller[0:4] != "ssl:":
 136         return controller
 137     else:
 138         return controller.split(':')[1]
 139
 140 def removeControllerCfg():
 141     vswitchCfgMod(["--", "clear", "Open_vSwitch", ".", "managers",
 142                    "--", "del-ssl"])
 143
 144 def setControllerCfg(controller):
 145     # /etc/xensource/xapi-ssl.pem is mentioned twice below because it
 146     # contains both the private key and the certificate.
 147     vswitchCfgMod(["--", "clear", "Open_vSwitch", ".", "managers",
 148                    "--", "del-ssl",
 149                    "--", "--bootstrap", "set-ssl",
 150                    "/etc/xensource/xapi-ssl.pem",
 151                    "/etc/xensource/xapi-ssl.pem",
 152                    cacert_filename,
 153                    "--", "set", "Open_vSwitch", ".",
 154                    'managers="ssl:' + controller + ':6632"'])
 155
 156 def vswitchCfgQuery(action_args):
 157     cmd = [vsctl, "--timeout=5", "-vANY:console:emer"] + action_args
 158     output = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()
 159     if len(output) == 0 or output[0] == None:
 160         output = ""
 161     else:
 162         output = output[0].strip()
 163     return output
 164
 165 def vswitchCfgMod(action_args):
 166     cmd = [vsctl, "--timeout=5", "-vANY:console:emer"] + action_args
 167     exitcode = subprocess.call(cmd)
 168     if exitcode != 0:
 169         raise XenAPIPlugin.Failure("VSWITCH_CONFIG_MOD_FAILURE",
 170                                    [ str(exitcode) , str(action_args) ])
 171
 172 def emergency_reset(session, args):
 173     cmd = [vsctl, "--timeout=5", "emer-reset"]
 174     exitcode = subprocess.call(cmd)
 175     if exitcode != 0:
 176         raise XenAPIPlugin.Failure("VSWITCH_EMER_RESET_FAILURE",
 177                                    [ str(exitcode) ])
 178
 179     return "Successfully reset configuration"
 180
 181 if __name__ == "__main__":
 182     XenAPIPlugin.dispatch({"update": update,
 183                            "emergency_reset": emergency_reset})