diff --git a/agents/aws/fence_aws.py b/agents/aws/fence_aws.py index 5d167714..0a375bbe 100644 --- a/agents/aws/fence_aws.py +++ b/agents/aws/fence_aws.py @@ -1,237 +1,238 @@ #!@PYTHON@ -tt import sys, re import logging import atexit sys.path.append("@FENCEAGENTSLIBDIR@") from fencing import * from fencing import fail, fail_usage, run_delay, EC_STATUS, SyslogLibHandler import requests from requests import HTTPError try: import boto3 from botocore.exceptions import ConnectionError, ClientError, EndpointConnectionError, NoRegionError except ImportError: pass logger = logging.getLogger() logger.propagate = False logger.setLevel(logging.INFO) logger.addHandler(SyslogLibHandler()) logging.getLogger('botocore.vendored').propagate = False def get_instance_id(options): try: token = requests.put('http://169.254.169.254/latest/api/token', headers={"X-aws-ec2-metadata-token-ttl-seconds" : "21600"}).content.decode("UTF-8") r = requests.get('http://169.254.169.254/latest/meta-data/instance-id', headers={"X-aws-ec2-metadata-token" : token}).content.decode("UTF-8") return r except HTTPError as http_err: logger.error('HTTP error occurred while trying to access EC2 metadata server: %s', http_err) except Exception as err: if "--skip-race-check" not in options: logger.error('A fatal error occurred while trying to access EC2 metadata server: %s', err) else: logger.debug('A fatal error occurred while trying to access EC2 metadata server: %s', err) return None def get_nodes_list(conn, options): logger.debug("Starting monitor operation") result = {} try: if "--filter" in options: filter_key = options["--filter"].split("=")[0].strip() filter_value = options["--filter"].split("=")[1].strip() filter = [{ "Name": filter_key, "Values": [filter_value] }] for instance in conn.instances.filter(Filters=filter): result[instance.id] = ("", None) else: for instance in conn.instances.all(): result[instance.id] = ("", None) except ClientError: fail_usage("Failed: Incorrect Access Key or Secret Key.") except EndpointConnectionError: fail_usage("Failed: Incorrect Region.") except ConnectionError as e: fail_usage("Failed: Unable to connect to AWS: " + str(e)) except Exception as e: logger.error("Failed to get node list: %s", e) logger.debug("Monitor operation OK: %s",result) return result def get_power_status(conn, options): logger.debug("Starting status operation") try: instance = conn.instances.filter(Filters=[{"Name": "instance-id", "Values": [options["--plug"]]}]) state = list(instance)[0].state["Name"] logger.debug("Status operation for EC2 instance %s returned state: %s",options["--plug"],state.upper()) if state == "running": return "on" elif state == "stopped": return "off" else: return "unknown" except ClientError: fail_usage("Failed: Incorrect Access Key or Secret Key.") except EndpointConnectionError: fail_usage("Failed: Incorrect Region.") except IndexError: fail(EC_STATUS) except Exception as e: logger.error("Failed to get power status: %s", e) fail(EC_STATUS) def get_self_power_status(conn, instance_id): try: instance = conn.instances.filter(Filters=[{"Name": "instance-id", "Values": [instance_id]}]) state = list(instance)[0].state["Name"] if state == "running": logger.debug("Captured my (%s) state and it %s - returning OK - Proceeding with fencing",instance_id,state.upper()) return "ok" else: logger.debug("Captured my (%s) state it is %s - returning Alert - Unable to fence other nodes",instance_id,state.upper()) return "alert" except ClientError: fail_usage("Failed: Incorrect Access Key or Secret Key.") except EndpointConnectionError: fail_usage("Failed: Incorrect Region.") except IndexError: return "fail" def set_power_status(conn, options): my_instance = get_instance_id(options) try: if (options["--action"]=="off"): if "--skip-race-check" in options or get_self_power_status(conn,my_instance) == "ok": conn.instances.filter(InstanceIds=[options["--plug"]]).stop(Force=True) logger.debug("Called StopInstance API call for %s", options["--plug"]) else: logger.debug("Skipping fencing as instance is not in running status") elif (options["--action"]=="on"): conn.instances.filter(InstanceIds=[options["--plug"]]).start() except Exception as e: logger.debug("Failed to power %s %s: %s", \ options["--action"], options["--plug"], e) + fail(EC_STATUS) def define_new_opts(): all_opt["region"] = { "getopt" : "r:", "longopt" : "region", "help" : "-r, --region=[region] Region, e.g. us-east-1", "shortdesc" : "Region.", "required" : "0", "order" : 2 } all_opt["access_key"] = { "getopt" : "a:", "longopt" : "access-key", "help" : "-a, --access-key=[key] Access Key", "shortdesc" : "Access Key.", "required" : "0", "order" : 3 } all_opt["secret_key"] = { "getopt" : "s:", "longopt" : "secret-key", "help" : "-s, --secret-key=[key] Secret Key", "shortdesc" : "Secret Key.", "required" : "0", "order" : 4 } all_opt["filter"] = { "getopt" : ":", "longopt" : "filter", "help" : "--filter=[key=value] Filter (e.g. vpc-id=[vpc-XXYYZZAA]", "shortdesc": "Filter for list-action", "required": "0", "order": 5 } all_opt["boto3_debug"] = { "getopt" : "b:", "longopt" : "boto3_debug", "help" : "-b, --boto3_debug=[option] Boto3 and Botocore library debug logging", "shortdesc": "Boto Lib debug", "required": "0", "default": "False", "order": 6 } all_opt["skip_race_check"] = { "getopt" : "", "longopt" : "skip-race-check", "help" : "--skip-race-check Skip race condition check", "shortdesc": "Skip race condition check", "required": "0", "order": 7 } # Main agent method def main(): conn = None device_opt = ["port", "no_password", "region", "access_key", "secret_key", "filter", "boto3_debug", "skip_race_check"] atexit.register(atexit_handler) define_new_opts() all_opt["power_timeout"]["default"] = "60" options = check_input(device_opt, process_input(device_opt)) docs = {} docs["shortdesc"] = "Fence agent for AWS (Amazon Web Services)" docs["longdesc"] = "fence_aws is an I/O Fencing agent for AWS (Amazon Web\ Services). It uses the boto3 library to connect to AWS.\ \n.P\n\ boto3 can be configured with AWS CLI or by creating ~/.aws/credentials.\n\ For instructions see: https://boto3.readthedocs.io/en/latest/guide/quickstart.html#configuration" docs["vendorurl"] = "http://www.amazon.com" show_docs(options, docs) run_delay(options) if "--debug-file" in options: for handler in logger.handlers: if isinstance(handler, logging.FileHandler): logger.removeHandler(handler) lh = logging.FileHandler(options["--debug-file"]) logger.addHandler(lh) lhf = logging.Formatter('%(asctime)s - %(name)s - %(levelname)s - %(message)s') lh.setFormatter(lhf) lh.setLevel(logging.DEBUG) if options["--boto3_debug"].lower() not in ["1", "yes", "on", "true"]: boto3.set_stream_logger('boto3',logging.INFO) boto3.set_stream_logger('botocore',logging.CRITICAL) logging.getLogger('botocore').propagate = False logging.getLogger('boto3').propagate = False else: log_format = logging.Formatter('%(asctime)s %(name)-12s %(levelname)-8s %(message)s') logging.getLogger('botocore').propagate = False logging.getLogger('boto3').propagate = False fdh = logging.FileHandler('/var/log/fence_aws_boto3.log') fdh.setFormatter(log_format) logging.getLogger('boto3').addHandler(fdh) logging.getLogger('botocore').addHandler(fdh) logging.debug("Boto debug level is %s and sending debug info to /var/log/fence_aws_boto3.log", options["--boto3_debug"]) region = options.get("--region") access_key = options.get("--access-key") secret_key = options.get("--secret-key") try: conn = boto3.resource('ec2', region_name=region, aws_access_key_id=access_key, aws_secret_access_key=secret_key) except Exception as e: fail_usage("Failed: Unable to connect to AWS: " + str(e)) # Operate the fencing device result = fence_action(conn, options, set_power_status, get_power_status, get_nodes_list) sys.exit(result) if __name__ == "__main__": main()