xenserver/etc_xapi.d_plugins_vswitch-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 file that are managed in the xapi database
   5 # when integrated with Citrix management tools.
   6
   7 # Copyright (C) 2009 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 logging
  25 log = logging.getLogger("vswitch-cfg-update")
  26 logging.basicConfig(filename="/var/log/vswitch-cfg-update.log", level=logging.DEBUG)
  27
  28 import XenAPIPlugin
  29 import XenAPI
  30 import subprocess
  31
  32 cfg_mod="/root/vswitch/bin/ovs-cfg-mod"
  33 vswitchd_cfg_filename="/etc/ovs-vswitchd.conf"
  34
  35 def update(session, args):
  36     pools = session.xenapi.pool.get_all()
  37     # We assume there is only ever one pool...
  38     if len(pools) == 0:
  39         log.error("No pool for host.")
  40         raise XenAPIPlugin.Failure("NO_POOL_FOR_HOST", [])
  41     if len(pools) > 1:
  42         log.error("More than one pool for host.")
  43         raise XenAPIPlugin.Failure("MORE_THAN_ONE_POOL_FOR_HOST", [])
  44     pool = session.xenapi.pool.get_record(pools[0])
  45     try:
  46         controller = pool["other_config"]["vSwitchController"]
  47     except KeyError, e:
  48         controller = ""
  49     currentController = vswitchCurrentController()
  50     if controller == "" and currentController != "":
  51         log.debug("Removing controller configuration.")
  52         removeControllerCfg()
  53         return "Successfully removed controller config"
  54     elif controller != currentController:
  55         if len(controller) == 0:
  56             log.debug("Setting controller to: %s" % (controller))
  57         else:
  58             log.debug("Changing controller from %s to %s" % (currentController, controller))
  59         setControllerCfg(controller)
  60         return "Successfully set controller to " + controller
  61     else:
  62         log.debug("No change to controller configuration required.")
  63     return "No change to configuration"
  64
  65 def vswitchCurrentController():
  66     controller = vswitchCfgQuery("mgmt.controller")
  67     if controller == "":
  68         return controller
  69     if len(controller) < 4 or controller[0:4] != "ssl:":
  70         log.warning("Controller does not specify ssl connection type, returning entire string.")
  71         return controller
  72     else:
  73         return controller[4:]
  74
  75 def removeControllerCfg():
  76     vswitchCfgMod(["--del-match", "mgmt.controller=*",
  77                    "--del-match", "ssl.bootstrap-ca-cert=*",
  78                    "--del-match", "ssl.ca-cert=*",
  79                    "--del-match", "ssl.private-key=*",
  80                    "--del-match", "ssl.certificate=*"])
  81
  82 def setControllerCfg(controller):
  83     vswitchCfgMod(["--del-match", "mgmt.controller=*",
  84                    "--del-match", "ssl.bootstrap-ca-cert=*",
  85                    "--del-match", "ssl.ca-cert=*",
  86                    "--del-match", "ssl.private-key=*",
  87                    "--del-match", "ssl.certificate=*",
  88                    "-a", "mgmt.controller=ssl:" + controller,
  89                    "-a", "ssl.bootstrap-ca-cert=true",
  90                    "-a", "ssl.ca-cert=/etc/ovs-vswitchd.cacert",
  91                    "-a", "ssl.private-key=/etc/xensource/xapi-ssl.pem",
  92                    "-a", "ssl.certificate=/etc/xensource/xapi-ssl.pem"])
  93
  94 def vswitchCfgQuery(key):
  95     cmd = [cfg_mod, "--config-file=" + vswitchd_cfg_filename, "-q", key]
  96     output = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()
  97     if len(output) == 0 or output[0] == None:
  98         output = ""
  99     else:
 100         output = output[0].strip()
 101     return output
 102
 103 def vswitchCfgMod(action_args):
 104     cmd = [cfg_mod, "-vANY:console:emer",
 105            "--config-file=" + vswitchd_cfg_filename] + action_args
 106     exitcode = subprocess.call(cmd)
 107     if exitcode != 0:
 108         log.error("ovs-cfg-mod failed with exit code "
 109                   + str(exitcode) + " for " + repr(action_args))
 110         raise XenAPIPlugin.Failure("VSWITCH_CONFIG_MOD_FAILURE",
 111                                    [ str(exitcode) , str(action_args) ])
 112     vswitchReload()
 113
 114 def vswitchReload():
 115     exitcode = subprocess.call(["/sbin/service", "vswitch", "reload"])
 116     if exitcode != 0:
 117         log.error("vswitch reload failed with exit code " + str(exitcode))
 118         raise XenAPIPlugin.Failure("VSWITCH_CFG_RELOAD_FAILURE", [ str(exitcode) ])
 119
 120
 121 if __name__ == "__main__":
 122     XenAPIPlugin.dispatch({"update": update})