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#!/usr/bin/env python
#
# xapi plugin script to update the cache of configuration items in the
# ovs-vswitchd configuration file that are managed in the xapi database
# when integrated with Citrix management tools.
# Copyright (C) 2009 Nicira Networks, Inc.
#
# This program 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.
#
# This program 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 this program. If not, see <http://www.gnu.org/licenses/>.
# TBD: - error handling needs to be improved. Currently this can leave
# TBD: the system in a bad state if anything goes wrong.
import logging
log = logging.getLogger("vswitch-cfg-update")
logging.basicConfig(filename="/var/log/vswitch-cfg-update.log", level=logging.DEBUG)
import XenAPIPlugin
import XenAPI
import subprocess
cfg_mod="/root/vswitch/bin/ovs-cfg-mod"
vswitchd_cfg_filename="/etc/ovs-vswitchd.conf"
def update(session, args):
pools = session.xenapi.pool.get_all()
# We assume there is only ever one pool...
if len(pools) == 0:
log.error("No pool for host.")
raise XenAPIPlugin.Failure("NO_POOL_FOR_HOST", [])
if len(pools) > 1:
log.error("More than one pool for host.")
raise XenAPIPlugin.Failure("MORE_THAN_ONE_POOL_FOR_HOST", [])
pool = session.xenapi.pool.get_record(pools[0])
try:
controller = pool["other_config"]["vSwitchController"]
except KeyError, e:
controller = ""
currentController = vswitchCurrentController()
if controller == "" and currentController != "":
log.debug("Removing controller configuration.")
removeControllerCfg()
return "Successfully removed controller config"
elif controller != currentController:
if len(controller) == 0:
log.debug("Setting controller to: %s" % (controller))
else:
log.debug("Changing controller from %s to %s" % (currentController, controller))
setControllerCfg(controller)
return "Successfully set controller to " + controller
else:
log.debug("No change to controller configuration required.")
return "No change to configuration"
def vswitchCurrentController():
controller = vswitchCfgQuery("mgmt.controller")
if controller == "":
return controller
if len(controller) < 4 or controller[0:4] != "ssl:":
log.warning("Controller does not specify ssl connection type, returning entire string.")
return controller
else:
return controller[4:]
def removeControllerCfg():
vswitchCfgMod(["--del-match", "mgmt.controller=*",
"--del-match", "ssl.bootstrap-ca-cert=*",
"--del-match", "ssl.ca-cert=*",
"--del-match", "ssl.private-key=*",
"--del-match", "ssl.certificate=*"])
def setControllerCfg(controller):
vswitchCfgMod(["--del-match", "mgmt.controller=*",
"--del-match", "ssl.bootstrap-ca-cert=*",
"--del-match", "ssl.ca-cert=*",
"--del-match", "ssl.private-key=*",
"--del-match", "ssl.certificate=*",
"-a", "mgmt.controller=ssl:" + controller,
"-a", "ssl.bootstrap-ca-cert=true",
"-a", "ssl.ca-cert=/etc/ovs-vswitchd.cacert",
"-a", "ssl.private-key=/etc/xensource/xapi-ssl.pem",
"-a", "ssl.certificate=/etc/xensource/xapi-ssl.pem"])
def vswitchCfgQuery(key):
cmd = [cfg_mod, "--config-file=" + vswitchd_cfg_filename, "-q", key]
output = subprocess.Popen(cmd, stdout=subprocess.PIPE).communicate()
if len(output) == 0 or output[0] == None:
output = ""
else:
output = output[0].strip()
return output
def vswitchCfgMod(action_args):
cmd = [cfg_mod, "-vANY:console:emer",
"--config-file=" + vswitchd_cfg_filename] + action_args
exitcode = subprocess.call(cmd)
if exitcode != 0:
log.error("ovs-cfg-mod failed with exit code "
+ str(exitcode) + " for " + repr(action_args))
raise XenAPIPlugin.Failure("VSWITCH_CONFIG_MOD_FAILURE",
[ str(exitcode) , str(action_args) ])
vswitchReload()
def vswitchReload():
exitcode = subprocess.call(["/sbin/service", "vswitch", "reload"])
if exitcode != 0:
log.error("vswitch reload failed with exit code " + str(exitcode))
raise XenAPIPlugin.Failure("VSWITCH_CFG_RELOAD_FAILURE", [ str(exitcode) ])
if __name__ == "__main__":
XenAPIPlugin.dispatch({"update": update})
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