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fence_compute.py
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#!/usr/bin/python -tt
import sys
import time
import atexit
import logging
sys.path.append("@FENCEAGENTSLIBDIR@")
from fencing import *
from fencing import fail_usage, is_executable, run_command, run_delay
from novaclient import client as nova_client
#BEGIN_VERSION_GENERATION
RELEASE_VERSION="4.0.11"
BUILD_DATE="(built Wed Nov 12 06:33:38 EST 2014)"
REDHAT_COPYRIGHT="Copyright (C) Red Hat, Inc. 2004-2010 All rights reserved."
#END_VERSION_GENERATION
override_status = ""
nova = None
def get_power_status(_, options):
global override_status
status = "unknown"
logging.debug("get action: " + options["--action"])
if len(override_status):
logging.debug("Pretending we're " + override_status)
return override_status
if nova:
try:
services = nova.services.list(host=options["--plug"])
except Exception, e:
fail_usage(str(e))
for service in services:
if service.binary == "nova-compute":
if service.state == "up":
status = "on"
elif service.state == "down":
status = "down"
else:
logging.debug("Unknown status detected from nova: " + service.state)
break
return status
# NOTE(sbauza); We mimic the host-evacuate module since it's only a contrib
# module which is not stable
def _server_evacuate(server, on_shared_storage):
success = True
error_message = ""
try:
nova.servers.evacuate(server=server['uuid'], on_shared_storage=on_shared_storage)
except Exception as e:
success = False
error_message = "Error while evacuating instance: %s" % e
return {
"server_uuid": server['uuid'],
"evacuate_accepted": success,
"error_message": error_message,
}
def _host_evacuate(host, on_shared_storage):
hypervisors = nova.hypervisors.search(host, servers=True)
response = []
for hyper in hypervisors:
if hasattr(hyper, 'servers'):
for server in hyper.servers:
response.append(_server_evacuate(server, on_shared_storage))
def set_power_status(_, options):
global override_status
override_status = ""
logging.debug("set action: " + options["--action"])
if not nova:
return
if options["--action"] == "on":
if get_power_status(_, options) == "on":
nova.services.enable(options["--plug"], 'nova-compute')
else:
# Pretend we're 'on' so that the fencing library doesn't loop forever waiting for the node to boot
override_status = "on"
return
# need to wait for nova to update its internal status or we
# cannot call host-evacuate
while get_power_status(_, options) != "off":
# Loop forever if need be.
#
# Some callers (such as Pacemaker) will have a timer
# running and kill us if necessary
logging.debug("Waiting for nova to update it's internal state")
time.sleep(1)
if "--no-shared-storage" not in options:
# If the admin sets this when they DO have shared
# storage in use, then they get what they asked for
on_shared_storage = True
else:
on_shared_storage = False
_host_evacuate(options["--plug"], on_shared_storage)
return
def get_plugs_list(_, options):
result = {}
if nova:
hypervisors = nova.hypervisors.list()
for hypervisor in hypervisors:
longhost = hypervisor.hypervisor_hostname
if options["--action"] == "list" and options["--domain"] != "":
shorthost = longhost.replace("." + options["--domain"],
"")
result[shorthost] = ("", None)
else:
result[longhost] = ("", None)
return result
def define_new_opts():
all_opt["tenant-name"] = {
"getopt" : "t:",
"longopt" : "tenant-name",
"help" : "-t, --tenant-name=[tenant] Keystone Admin Tenant",
"required" : "0",
"shortdesc" : "Keystone Admin Tenant",
"default" : "",
"order": 1,
}
all_opt["auth-url"] = {
"getopt" : "k:",
"longopt" : "auth-url",
"help" : "-k, --auth-url=[tenant] Keystone Admin Auth URL",
"required" : "0",
"shortdesc" : "Keystone Admin Auth URL",
"default" : "",
"order": 1,
}
all_opt["novatool-path"] = {
"getopt" : "i:",
"longopt" : "novatool-path",
"help" : "-i, --novatool-path=[path] Path to nova binary",
"required" : "0",
"shortdesc" : "Path to nova binary",
"default" : "@NOVA_PATH@",
"order": 6,
}
all_opt["domain"] = {
"getopt" : "d:",
"longopt" : "domain",
"help" : "-d, --domain=[string] DNS domain in which hosts live, useful when the cluster uses short names and nova uses FQDN",
"required" : "0",
"shortdesc" : "DNS domain in which hosts live",
"default" : "",
"order": 5,
}
all_opt["no-shared-storage"] = {
"getopt" : "",
"longopt" : "no-shared-storage",
"help" : "--no-shared-storage Disable functionality for shared storage",
"required" : "0",
"shortdesc" : "Disable functionality for dealing with shared storage",
"default" : "False",
"order": 5,
}
def main():
global override_status
global nova
atexit.register(atexit_handler)
device_opt = ["login", "passwd", "tenant-name", "auth-url",
"novatool-path", "no_login", "no_password", "port", "domain", "no-shared-storage"]
define_new_opts()
all_opt["shell_timeout"]["default"] = "180"
options = check_input(device_opt, process_input(device_opt))
docs = {}
docs["shortdesc"] = "Fence agent for nova compute nodes"
docs["longdesc"] = "fence_nova_host is a Nova fencing notification agent"
docs["vendorurl"] = ""
show_docs(options, docs)
run_delay(options)
# The first argument is the Nova client version
nova = nova_client.Client('2',
options["--username"],
options["--password"],
options["--tenant-name"],
options["--auth-url"])
if options["--action"] in ["off", "reboot"]:
# Pretend we're 'on' so that the fencing library will always call set_power_status(off)
override_status = "on"
if options["--action"] == "on":
# Pretend we're 'off' so that the fencing library will always call set_power_status(on)
override_status = "off"
# Potentially we should make this a pacemaker feature
if options["--action"] != "list" and options["--domain"] != "" and options.has_key("--plug"):
options["--plug"] = options["--plug"]+"."+options["--domain"]
result = fence_action(None, options, set_power_status, get_power_status, get_plugs_list, None)
sys.exit(result)
if __name__ == "__main__":
main()

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