diff --git a/agents/gce/fence_gce.py b/agents/gce/fence_gce.py index 63c7858f..2bf4da5a 100644 --- a/agents/gce/fence_gce.py +++ b/agents/gce/fence_gce.py @@ -1,611 +1,613 @@ #!@PYTHON@ -tt # # Requires the googleapiclient and oauth2client # RHEL 7.x: google-api-python-client==1.6.7 python-gflags==2.0 pyasn1==0.4.8 rsa==3.4.2 pysocks==1.7.1 httplib2==0.19.0 # RHEL 8.x: pysocks==1.7.1 httplib2==0.19.0 # SLES 12.x: python-google-api-python-client python-oauth2client python-oauth2client-gce pysocks==1.7.1 httplib2==0.19.0 # SLES 15.x: python3-google-api-python-client python3-oauth2client pysocks==1.7.1 httplib2==0.19.0 # import atexit import httplib2 import logging import json import re import os import socket import sys import time from ssl import SSLError if sys.version_info >= (3, 0): # Python 3 imports. import urllib.parse as urlparse import urllib.request as urlrequest else: # Python 2 imports. import urllib as urlparse import urllib2 as urlrequest sys.path.append("@FENCEAGENTSLIBDIR@") from fencing import fail_usage, run_delay, all_opt, atexit_handler, check_input, process_input, show_docs, fence_action, run_command try: import googleapiclient.discovery import socks try: from google.oauth2.credentials import Credentials as GoogleCredentials except: from oauth2client.client import GoogleCredentials except: pass METADATA_SERVER = 'http://metadata.google.internal/computeMetadata/v1/' METADATA_HEADERS = {'Metadata-Flavor': 'Google'} INSTANCE_LINK = 'https://www.googleapis.com/compute/v1/projects/{}/zones/{}/instances/{}' def run_on_fail(options): if "--runonfail" in options: run_command(options, options["--runonfail"]) def fail_fence_agent(options, message): run_on_fail(options) fail_usage(message) def raise_fence_agent(options, message): run_on_fail(options) raise Exception(message) # # Will use baremetalsolution setting or the environment variable # FENCE_GCE_URI_REPLACEMENTS to replace the uri for calls to *.googleapis.com. # def replace_api_uri(options, http_request): uri_replacements = [] # put any env var replacements first, then baremetalsolution if in options if "FENCE_GCE_URI_REPLACEMENTS" in os.environ: logging.debug("FENCE_GCE_URI_REPLACEMENTS environment variable exists") env_uri_replacements = os.environ["FENCE_GCE_URI_REPLACEMENTS"] try: uri_replacements_json = json.loads(env_uri_replacements) if isinstance(uri_replacements_json, list): uri_replacements = uri_replacements_json else: logging.warning("FENCE_GCE_URI_REPLACEMENTS exists, but is not a JSON List") except ValueError as e: logging.warning("FENCE_GCE_URI_REPLACEMENTS exists but is not valid JSON") if "--baremetalsolution" in options: uri_replacements.append( { "matchlength": 4, "match": "https://compute.googleapis.com/compute/v1/projects/(.*)/zones/(.*)/instances/(.*)/reset(.*)", "replace": "https://baremetalsolution.googleapis.com/v1/projects/\\1/locations/\\2/instances/\\3:resetInstance\\4" }) for uri_replacement in uri_replacements: # each uri_replacement should have matchlength, match, and replace if "matchlength" not in uri_replacement or "match" not in uri_replacement or "replace" not in uri_replacement: logging.warning("FENCE_GCE_URI_REPLACEMENTS missing matchlength, match, or replace in %s" % uri_replacement) continue match = re.match(uri_replacement["match"], http_request.uri) if match is None or len(match.groups()) != uri_replacement["matchlength"]: continue replaced_uri = re.sub(uri_replacement["match"], uri_replacement["replace"], http_request.uri) match = re.match("https:\/\/.*.googleapis.com", replaced_uri) if match is None or match.start() != 0: logging.warning("FENCE_GCE_URI_REPLACEMENTS replace is not " "targeting googleapis.com, ignoring it: %s" % replaced_uri) continue logging.debug("Replacing googleapis uri %s with %s" % (http_request.uri, replaced_uri)) http_request.uri = replaced_uri break return http_request def retry_api_execute(options, http_request): replaced_http_request = replace_api_uri(options, http_request) retries = 3 if options.get("--retries"): retries = int(options.get("--retries")) retry_sleep = 5 if options.get("--retrysleep"): retry_sleep = int(options.get("--retrysleep")) retry = 0 current_err = None while retry <= retries: if retry > 0: time.sleep(retry_sleep) try: return replaced_http_request.execute() except Exception as err: current_err = err logging.warning("Could not execute api call to: %s, retry: %s, " "err: %s" % (replaced_http_request.uri, retry, str(err))) retry += 1 raise current_err def translate_status(instance_status): "Returns on | off | unknown." if instance_status == "RUNNING": return "on" elif instance_status == "TERMINATED": return "off" return "unknown" def get_nodes_list(conn, options): result = {} - if "--zone" not in options: - fail_fence_agent(options, "Failed: get_nodes_list: Please specify the --zone in the command") + plug = options["--plug"] if "--plug" in options else "" + zones = options["--zone"] if "--zone" in options else "" + if not zones: + zones = get_zone(conn, options, plug) if "--plugzonemap" not in options else options["--plugzonemap"][plug] try: - for zone in options["--zone"].split(","): + for zone in zones.split(","): instanceList = retry_api_execute(options, conn.instances().list( project=options["--project"], zone=zone)) for instance in instanceList["items"]: result[instance["id"]] = (instance["name"], translate_status(instance["status"])) except Exception as err: fail_fence_agent(options, "Failed: get_nodes_list: {}".format(str(err))) return result def get_power_status(conn, options): logging.debug("get_power_status") # if this is bare metal we need to just send back the opposite of the # requested action: if on send off, if off send on if "--baremetalsolution" in options: if options.get("--action") == "on": return "off" else: return "on" # If zone is not listed for an entry we attempt to get it automatically instance = options["--plug"] zone = get_zone(conn, options, instance) if "--plugzonemap" not in options else options["--plugzonemap"][instance] instance_status = get_instance_power_status(conn, options, instance, zone) # If any of the instances do not match the intended status we return the # the opposite status so that the fence agent can change it. if instance_status != options.get("--action"): return instance_status return options.get("--action") def get_instance_power_status(conn, options, instance, zone): try: instance = retry_api_execute( options, conn.instances().get(project=options["--project"], zone=zone, instance=instance)) return translate_status(instance["status"]) except Exception as err: fail_fence_agent(options, "Failed: get_instance_power_status: {}".format(str(err))) def check_for_existing_operation(conn, options, instance, zone, operation_type): logging.debug("check_for_existing_operation") if "--baremetalsolution" in options: # There is no API for checking in progress operations return False project = options["--project"] target_link = INSTANCE_LINK.format(project, zone, instance) query_filter = '(targetLink = "{}") AND (operationType = "{}") AND (status = "RUNNING")'.format(target_link, operation_type) result = retry_api_execute( options, conn.zoneOperations().list(project=project, zone=zone, filter=query_filter, maxResults=1)) if "items" in result and result["items"]: logging.info("Existing %s operation found", operation_type) return result["items"][0] def wait_for_operation(conn, options, zone, operation): if 'name' not in operation: logging.warning('Cannot wait for operation to complete, the' ' requested operation will continue asynchronously') return False wait_time = 0 project = options["--project"] while True: result = retry_api_execute(options, conn.zoneOperations().get( project=project, zone=zone, operation=operation['name'])) if result['status'] == 'DONE': if 'error' in result: raise_fence_agent(options, result['error']) return True if "--errortimeout" in options and wait_time > int(options["--errortimeout"]): raise_fence_agent(options, "Operation did not complete before the timeout.") if "--warntimeout" in options and wait_time > int(options["--warntimeout"]): logging.warning("Operation did not complete before the timeout.") if "--runonwarn" in options: run_command(options, options["--runonwarn"]) return False wait_time = wait_time + 1 time.sleep(1) def set_power_status(conn, options): logging.debug("set_power_status") instance = options["--plug"] # If zone is not listed for an entry we attempt to get it automatically zone = get_zone(conn, options, instance) if "--plugzonemap" not in options else options["--plugzonemap"][instance] set_instance_power_status(conn, options, instance, zone, options["--action"]) def set_instance_power_status(conn, options, instance, zone, action): logging.info("Setting power status of %s in zone %s", instance, zone) project = options["--project"] try: if action == "off": logging.info("Issuing poweroff of %s in zone %s", instance, zone) operation = check_for_existing_operation(conn, options, instance, zone, "stop") if operation and "--earlyexit" in options: return if not operation: operation = retry_api_execute( options, conn.instances().stop(project=project, zone=zone, instance=instance)) logging.info("Poweroff command completed, waiting for the operation to complete") if wait_for_operation(conn, options, zone, operation): logging.info("Poweroff of %s in zone %s complete", instance, zone) elif action == "on": logging.info("Issuing poweron of %s in zone %s", instance, zone) operation = check_for_existing_operation(conn, options, instance, zone, "start") if operation and "--earlyexit" in options: return if not operation: operation = retry_api_execute( options, conn.instances().start(project=project, zone=zone, instance=instance)) if wait_for_operation(conn, options, zone, operation): logging.info("Poweron of %s in zone %s complete", instance, zone) except Exception as err: fail_fence_agent(options, "Failed: set_instance_power_status: {}".format(str(err))) def power_cycle(conn, options): logging.debug("power_cycle") instance = options["--plug"] # If zone is not listed for an entry we attempt to get it automatically zone = get_zone(conn, options, instance) if "--plugzonemap" not in options else options["--plugzonemap"][instance] return power_cycle_instance(conn, options, instance, zone) def power_cycle_instance(conn, options, instance, zone): logging.info("Issuing reset of %s in zone %s", instance, zone) project = options["--project"] try: operation = check_for_existing_operation(conn, options, instance, zone, "reset") if operation and "--earlyexit" in options: return True if not operation: operation = retry_api_execute( options, conn.instances().reset(project=project, zone=zone, instance=instance)) logging.info("Reset command sent, waiting for the operation to complete") if wait_for_operation(conn, options, zone, operation): logging.info("Reset of %s in zone %s complete", instance, zone) return True except Exception as err: logging.exception("Failed: power_cycle") raise err def get_zone(conn, options, instance): logging.debug("get_zone"); project = options['--project'] fl = 'name="%s"' % instance request = replace_api_uri(options, conn.instances().aggregatedList(project=project, filter=fl)) while request is not None: response = request.execute() zones = response.get('items', {}) for zone in zones.values(): for inst in zone.get('instances', []): if inst['name'] == instance: return inst['zone'].split("/")[-1] request = replace_api_uri(options, conn.instances().aggregatedList_next( previous_request=request, previous_response=response)) raise_fence_agent(options, "Unable to find instance %s" % (instance)) def get_metadata(metadata_key, params=None, timeout=None): """Performs a GET request with the metadata headers. Args: metadata_key: string, the metadata to perform a GET request on. params: dictionary, the query parameters in the GET request. timeout: int, timeout in seconds for metadata requests. Returns: HTTP response from the GET request. Raises: urlerror.HTTPError: raises when the GET request fails. """ logging.debug("get_metadata"); timeout = timeout or 60 metadata_url = os.path.join(METADATA_SERVER, metadata_key) params = urlparse.urlencode(params or {}) url = '%s?%s' % (metadata_url, params) request = urlrequest.Request(url, headers=METADATA_HEADERS) request_opener = urlrequest.build_opener(urlrequest.ProxyHandler({})) return request_opener.open(request, timeout=timeout * 1.1).read().decode("utf-8") def define_new_opts(): all_opt["zone"] = { "getopt" : ":", "longopt" : "zone", "help" : "--zone=[name] Zone, e.g. us-central1-b", "shortdesc" : "Zone.", "required" : "0", "order" : 2 } all_opt["project"] = { "getopt" : ":", "longopt" : "project", "help" : "--project=[name] Project ID", "shortdesc" : "Project ID.", "required" : "0", "order" : 3 } all_opt["stackdriver-logging"] = { "getopt" : "", "longopt" : "stackdriver-logging", "help" : "--stackdriver-logging Enable Logging to Stackdriver", "shortdesc" : "Stackdriver-logging support.", "longdesc" : "If enabled IP failover logs will be posted to stackdriver logging.", "required" : "0", "order" : 4 } all_opt["baremetalsolution"] = { "getopt" : "", "longopt" : "baremetalsolution", "help" : "--baremetalsolution Enable on bare metal", "shortdesc" : "If enabled this is a bare metal offering from google.", "required" : "0", "order" : 5 } all_opt["apitimeout"] = { "getopt" : ":", "type" : "second", "longopt" : "apitimeout", "help" : "--apitimeout=[seconds] Timeout to use for API calls", "shortdesc" : "Timeout in seconds to use for API calls, default is 60.", "required" : "0", "default" : 60, "order" : 6 } all_opt["retries"] = { "getopt" : ":", "type" : "integer", "longopt" : "retries", "help" : "--retries=[retries] Number of retries on failure for API calls", "shortdesc" : "Number of retries on failure for API calls, default is 3.", "required" : "0", "default" : 3, "order" : 7 } all_opt["retrysleep"] = { "getopt" : ":", "type" : "second", "longopt" : "retrysleep", "help" : "--retrysleep=[seconds] Time to sleep between API retries", "shortdesc" : "Time to sleep in seconds between API retries, default is 5.", "required" : "0", "default" : 5, "order" : 8 } all_opt["serviceaccount"] = { "getopt" : ":", "longopt" : "serviceaccount", "help" : "--serviceaccount=[filename] Service account json file location e.g. serviceaccount=/somedir/service_account.json", "shortdesc" : "Service Account to use for authentication to the google cloud APIs.", "required" : "0", "order" : 9 } all_opt["plugzonemap"] = { "getopt" : ":", "longopt" : "plugzonemap", "help" : "--plugzonemap=[plugzonemap] Comma separated zone map when fencing multiple plugs", "shortdesc" : "Comma separated zone map when fencing multiple plugs.", "required" : "0", "order" : 10 } all_opt["proxyhost"] = { "getopt" : ":", "longopt" : "proxyhost", "help" : "--proxyhost=[proxy_host] The proxy host to use, if one is needed to access the internet (Example: 10.122.0.33)", "shortdesc" : "If a proxy is used for internet access, the proxy host should be specified.", "required" : "0", "order" : 11 } all_opt["proxyport"] = { "getopt" : ":", "type" : "integer", "longopt" : "proxyport", "help" : "--proxyport=[proxy_port] The proxy port to use, if one is needed to access the internet (Example: 3127)", "shortdesc" : "If a proxy is used for internet access, the proxy port should be specified.", "required" : "0", "order" : 12 } all_opt["earlyexit"] = { "getopt" : "", "longopt" : "earlyexit", "help" : "--earlyexit Return early if reset is already in progress", "shortdesc" : "If an existing reset operation is detected, the fence agent will return before the operation completes with a 0 return code.", "required" : "0", "order" : 13 } all_opt["warntimeout"] = { "getopt" : ":", "type" : "second", "longopt" : "warntimeout", "help" : "--warntimeout=[warn_timeout] Timeout seconds before logging a warning and returning a 0 status code", "shortdesc" : "If the operation is not completed within the timeout, the cluster operations are allowed to continue.", "required" : "0", "order" : 14 } all_opt["errortimeout"] = { "getopt" : ":", "type" : "second", "longopt" : "errortimeout", "help" : "--errortimeout=[error_timeout] Timeout seconds before failing and returning a non-zero status code", "shortdesc" : "If the operation is not completed within the timeout, cluster is notified of the operation failure.", "required" : "0", "order" : 15 } all_opt["runonwarn"] = { "getopt" : ":", "longopt" : "runonwarn", "help" : "--runonwarn=[run_on_warn] If a timeout occurs and warning is generated, run the supplied command", "shortdesc" : "If a timeout would occur while running the agent, then the supplied command is run.", "required" : "0", "order" : 16 } all_opt["runonfail"] = { "getopt" : ":", "longopt" : "runonfail", "help" : "--runonfail=[run_on_fail] If a failure occurs, run the supplied command", "shortdesc" : "If a failure would occur while running the agent, then the supplied command is run.", "required" : "0", "order" : 17 } def main(): conn = None device_opt = ["port", "no_password", "zone", "project", "stackdriver-logging", "method", "baremetalsolution", "apitimeout", "retries", "retrysleep", "serviceaccount", "plugzonemap", "proxyhost", "proxyport", "earlyexit", "warntimeout", "errortimeout", "runonwarn", "runonfail"] atexit.register(atexit_handler) define_new_opts() all_opt["power_timeout"]["default"] = "60" all_opt["method"]["default"] = "cycle" all_opt["method"]["help"] = "-m, --method=[method] Method to fence (onoff|cycle) (Default: cycle)" options = check_input(device_opt, process_input(device_opt)) docs = {} docs["shortdesc"] = "Fence agent for GCE (Google Cloud Engine)" docs["longdesc"] = "fence_gce is an I/O Fencing agent for GCE (Google Cloud " \ "Engine). It uses the googleapiclient library to connect to GCE.\n" \ "googleapiclient can be configured with Google SDK CLI or by " \ "executing 'gcloud auth application-default login'.\n" \ "For instructions see: https://cloud.google.com/compute/docs/tutorials/python-guide" docs["vendorurl"] = "http://cloud.google.com" show_docs(options, docs) run_delay(options) # Prepare logging if options.get('--verbose') is None: logging.getLogger('googleapiclient').setLevel(logging.ERROR) logging.getLogger('oauth2client').setLevel(logging.ERROR) if options.get('--stackdriver-logging') is not None and options.get('--plug'): try: import google.cloud.logging.handlers client = google.cloud.logging.Client() handler = google.cloud.logging.handlers.CloudLoggingHandler(client, name=options['--plug']) handler.setLevel(logging.INFO) formatter = logging.Formatter('gcp:stonith "%(message)s"') handler.setFormatter(formatter) root_logger = logging.getLogger() if options.get('--verbose') is None: root_logger.setLevel(logging.INFO) root_logger.addHandler(handler) except ImportError: logging.error('Couldn\'t import google.cloud.logging, ' 'disabling Stackdriver-logging support') # if apitimeout is defined we set the socket timeout, if not we keep the # socket default which is 60s if options.get("--apitimeout"): socket.setdefaulttimeout(options["--apitimeout"]) # Prepare cli try: serviceaccount = options.get("--serviceaccount") if serviceaccount: scope = ['https://www.googleapis.com/auth/cloud-platform'] logging.debug("using credentials from service account") try: from google.oauth2.service_account import Credentials as ServiceAccountCredentials credentials = ServiceAccountCredentials.from_service_account_file(filename=serviceaccount, scopes=scope) except ImportError: from oauth2client.service_account import ServiceAccountCredentials credentials = ServiceAccountCredentials.from_json_keyfile_name(serviceaccount, scope) else: try: from googleapiclient import _auth credentials = _auth.default_credentials(); except: credentials = GoogleCredentials.get_application_default() logging.debug("using application default credentials") if options.get("--proxyhost") and options.get("--proxyport"): proxy_info = httplib2.ProxyInfo( proxy_type=socks.PROXY_TYPE_HTTP, proxy_host=options.get("--proxyhost"), proxy_port=int(options.get("--proxyport"))) http = credentials.authorize(httplib2.Http(proxy_info=proxy_info)) conn = googleapiclient.discovery.build( 'compute', 'v1', http=http, cache_discovery=False) else: conn = googleapiclient.discovery.build( 'compute', 'v1', credentials=credentials, cache_discovery=False) except SSLError as err: fail_fence_agent(options, "Failed: Create GCE compute v1 connection: {}\n\nThis might be caused by old versions of httplib2.".format(str(err))) except Exception as err: fail_fence_agent(options, "Failed: Create GCE compute v1 connection: {}".format(str(err))) # Get project and zone if not options.get("--project"): try: options["--project"] = get_metadata('project/project-id') except Exception as err: fail_fence_agent(options, "Failed retrieving GCE project. Please provide --project option: {}".format(str(err))) if "--baremetalsolution" in options: options["--zone"] = "none" # Populates zone automatically if missing from the command zones = [] if not "--zone" in options else options["--zone"].split(",") options["--plugzonemap"] = {} if "--plug" in options: for i, instance in enumerate(options["--plug"].split(",")): if len(zones) == 1: # If only one zone is specified, use it across all plugs options["--plugzonemap"][instance] = zones[0] continue if len(zones) - 1 >= i: # If we have enough zones specified with the --zone flag use the zone at # the same index as the plug options["--plugzonemap"][instance] = zones[i] continue try: # In this case we do not have a zone specified so we attempt to detect it options["--plugzonemap"][instance] = get_zone(conn, options, instance) except Exception as err: fail_fence_agent(options, "Failed retrieving GCE zone. Please provide --zone option: {}".format(str(err))) # Operate the fencing device result = fence_action(conn, options, set_power_status, get_power_status, get_nodes_list, power_cycle) sys.exit(result) if __name__ == "__main__": main()