Source code for bioblend.cloudman.launch

Setup and launch a CloudMan instance.
import datetime
import socket
from http.client import (
from urllib.parse import urlparse

import boto
import yaml
from boto.ec2.regioninfo import RegionInfo
from boto.exception import EC2ResponseError, S3ResponseError
from boto.s3.connection import OrdinaryCallingFormat, S3Connection, SubdomainCallingFormat

import bioblend
from bioblend.util import Bunch

# Uncomment the following line if no logging from boto is desired
# bioblend.logging.getLogger('boto').setLevel(bioblend.logging.CRITICAL)
# Uncomment the following line if logging at the prompt is desired
# bioblend.set_stream_logger(__name__)
def instance_types(cloud_name='generic'):
    Return a list of dictionaries containing details about the available
    instance types for the given `cloud_name`.

    :type cloud_name: str
    :param cloud_name: A name of the cloud for which the list of instance
                       types will be returned. Valid values are: `aws`,
                       `nectar`, `generic`.

    :rtype: list
    :return: A list of dictionaries describing instance types. Each dict will
             contain the following keys: `name`, `model`, and `description`.
    instance_list = []
    if cloud_name.lower() == 'aws':
        instance_list.append({"model": "c3.large",
                              "name": "Compute optimized Large",
                              "description": "2 vCPU/4GB RAM"})
        instance_list.append({"model": "c3.2xlarge",
                              "name": "Compute optimized 2xLarge",
                              "description": "8 vCPU/15GB RAM"})
        instance_list.append({"model": "c3.8xlarge",
                              "name": "Compute optimized 8xLarge",
                              "description": "32 vCPU/60GB RAM"})
    elif cloud_name.lower() in ['nectar', 'generic']:
        instance_list.append({"model": "m1.small",
                              "name": "Small",
                              "description": "1 vCPU / 4GB RAM"})
        instance_list.append({"model": "m1.medium",
                              "name": "Medium",
                              "description": "2 vCPU / 8GB RAM"})
        instance_list.append({"model": "m1.large",
                              "name": "Large",
                              "description": "4 vCPU / 16GB RAM"})
        instance_list.append({"model": "m1.xlarge",
                              "name": "Extra Large",
                              "description": "8 vCPU / 32GB RAM"})
        instance_list.append({"model": "m1.xxlarge",
                              "name": "Extra-extra Large",
                              "description": "16 vCPU / 64GB RAM"})
    return instance_list

[docs]class CloudManLauncher: def __init__(self, access_key, secret_key, cloud=None): """ Define the environment in which this instance of CloudMan will be launched. Besides providing the credentials, optionally provide the ``cloud`` object. This object must define the properties required to establish a `boto <>`_ connection to that cloud. See this method's implementation for an example of the required fields. Note that as long the as provided object defines the required fields, it can really by implemented as anything (e.g., a Bunch, a database object, a custom class). If no value for the ``cloud`` argument is provided, the default is to use the Amazon cloud. """ self.access_key = access_key self.secret_key = secret_key if cloud is None: # Default to an EC2-compatible object = Bunch(id='1', # for compatibility w/ DB representation name="Amazon", cloud_type="ec2", bucket_default="cloudman", region_name="us-east-1", region_endpoint="", ec2_port="", ec2_conn_path="/", cidr_range="", is_secure=True, s3_host="", s3_port="", s3_conn_path='/') else: = cloud self.ec2_conn = self.connect_ec2( self.access_key, self.secret_key, self.vpc_conn = self.connect_vpc( self.access_key, self.secret_key, # Define exceptions that we want to catch and retry self.http_exceptions = ( HTTPException, socket.error, socket.gaierror, BadStatusLine ) def __repr__(self): return f"Cloud: {}; acct ID: {self.access_key}"
[docs] def launch(self, cluster_name, image_id, instance_type, password, kernel_id=None, ramdisk_id=None, key_name='cloudman_key_pair', security_groups=None, placement='', subnet_id=None, ebs_optimized=False, **kwargs): """ Check all the prerequisites (key pair and security groups) for launching a CloudMan instance, compose the user data based on the parameters specified in the arguments and the cloud properties as defined in the object's ``cloud`` field. For the current list of user data fields that can be provided via ``kwargs``, see `<>`_ Return a dict containing the properties and info with which an instance was launched, namely: ``sg_names`` containing the names of the security groups, ``kp_name`` containing the name of the key pair, ``kp_material`` containing the private portion of the key pair (*note* that this portion of the key is available and can be retrieved *only* at the time the key is created, which will happen only if no key with the name provided in the ``key_name`` argument exists), ``rs`` containing the `boto <>`_ ``ResultSet`` object, ``instance_id`` containing the ID of a started instance, and ``error`` containing an error message if there was one. """ if security_groups is None: security_groups = ['CloudMan'] ret = {'sg_names': [], 'sg_ids': [], 'kp_name': '', 'kp_material': '', 'rs': None, 'instance_id': '', 'error': None} # First satisfy the prerequisites for sg in security_groups: # Get VPC ID in case we're launching into a VPC vpc_id = None if subnet_id: try: sn = self.vpc_conn.get_all_subnets(subnet_id)[0] vpc_id = sn.vpc_id except (EC2ResponseError, IndexError): bioblend.log.exception("Trouble fetching subnet %s", subnet_id) cmsg = self.create_cm_security_group(sg, vpc_id=vpc_id) ret['error'] = cmsg['error'] if ret['error']: return ret if cmsg['name']: ret['sg_names'].append(cmsg['name']) ret['sg_ids'].append(cmsg['sg_id']) if subnet_id: # Must setup a network interface if launching into VPC security_groups = None interface = boto.ec2.networkinterface.NetworkInterfaceSpecification( subnet_id=subnet_id, groups=[cmsg['sg_id']], associate_public_ip_address=True) network_interfaces = (boto.ec2.networkinterface. NetworkInterfaceCollection(interface)) else: network_interfaces = None kp_info = self.create_key_pair(key_name) ret['kp_name'] = kp_info['name'] ret['kp_material'] = kp_info['material'] ret['error'] = kp_info['error'] if ret['error']: return ret # If not provided, try to find a placement # TODO: Should placement always be checked? To make sure it's correct # for existing clusters. if not placement: placement = self._find_placement( cluster_name).get('placement', None) # Compose user data for launching an instance, ensuring we have the # required fields kwargs['access_key'] = self.access_key kwargs['secret_key'] = self.secret_key kwargs['cluster_name'] = cluster_name kwargs['password'] = password kwargs['cloud_name'] = ud = self._compose_user_data(kwargs) # Now launch an instance try: rs = None rs = self.ec2_conn.run_instances(image_id=image_id, instance_type=instance_type, key_name=key_name, security_groups=security_groups, # The following two arguments are # provided in the network_interface # instead of arguments: # security_group_ids=security_group_ids, # subnet_id=subnet_id, network_interfaces=network_interfaces, user_data=ud, kernel_id=kernel_id, ramdisk_id=ramdisk_id, placement=placement, ebs_optimized=ebs_optimized) ret['rs'] = rs except EC2ResponseError as e: err_msg = f"Problem launching an instance: {e} (code {e.error_code}; status {e.status})" bioblend.log.exception(err_msg) ret['error'] = err_msg return ret else: if rs: try:"Launched an instance with ID %s", rs.instances[0].id) ret['instance_id'] = rs.instances[0].id ret['instance_ip'] = rs.instances[0].ip_address except EC2ResponseError as e: err_msg = f"Problem with the launched instance object: {e} (code {e.error_code}; status {e.status})" bioblend.log.exception(err_msg) ret['error'] = err_msg else: ret['error'] = ("No response after launching an instance. Check " "your account permissions and try again.") return ret
[docs] def create_cm_security_group(self, sg_name='CloudMan', vpc_id=None): """ Create a security group with all authorizations required to run CloudMan. If the group already exists, check its rules and add the missing ones. :type sg_name: str :param sg_name: A name for the security group to be created. :type vpc_id: str :param vpc_id: VPC ID under which to create the security group. :rtype: dict :return: A dictionary containing keys ``name`` (with the value being the name of the security group that was created), ``error`` (with the value being the error message if there was an error or ``None`` if no error was encountered), and ``ports`` (containing the list of tuples with port ranges that were opened or attempted to be opened). .. versionchanged:: 0.6.1 The return value changed from a string to a dict """ ports = (('20', '21'), # FTP ('22', '22'), # SSH ('80', '80'), # Web UI ('443', '443'), # SSL Web UI ('8800', '8800'), # NodeJS Proxy for Galaxy IPython IE ('9600', '9700'), # HTCondor ('30000', '30100')) # FTP transfer progress = {'name': None, 'sg_id': None, 'error': None, 'ports': ports} cmsg = None filters = None if vpc_id: filters = {'vpc-id': vpc_id} # Check if this security group already exists try: sgs = self.ec2_conn.get_all_security_groups(filters=filters) except EC2ResponseError as e: err_msg = f"Problem getting security groups. This could indicate a problem with your account credentials or permissions: {e} (code {e.error_code}; status {e.status})" bioblend.log.exception(err_msg) progress['error'] = err_msg return progress for sg in sgs: if == sg_name: cmsg = sg bioblend.log.debug("Security group '%s' already exists; will add authorizations next.", sg_name) break # If it does not exist, create security group if cmsg is None: bioblend.log.debug("Creating Security Group %s", sg_name) try: cmsg = self.ec2_conn.create_security_group(sg_name, 'A security ' 'group for CloudMan', vpc_id=vpc_id) except EC2ResponseError as e: err_msg = f"Problem creating security group '{sg_name}': {e} (code {e.error_code}; status {e.status})" bioblend.log.exception(err_msg) progress['error'] = err_msg if cmsg: progress['name'] = progress['sg_id'] = # Add appropriate authorization rules # If these rules already exist, nothing will be changed in the SG for port in ports: try: if not self.rule_exists( cmsg.rules, from_port=port[0], to_port=port[1]): cmsg.authorize( ip_protocol='tcp', from_port=port[0], to_port=port[1], cidr_ip='') else: bioblend.log.debug("Rule (%s:%s) already exists in the SG", port[0], port[1]) except EC2ResponseError as e: err_msg = f"A problem adding security group authorizations: {e} (code {e.error_code}; status {e.status})" bioblend.log.exception(err_msg) progress['error'] = err_msg # Add ICMP (i.e., ping) rule required by HTCondor try: if not self.rule_exists( cmsg.rules, from_port='-1', to_port='-1', ip_protocol='icmp'): cmsg.authorize( ip_protocol='icmp', from_port=-1, to_port=-1, cidr_ip='') else: bioblend.log.debug( f"ICMP rule already exists in {sg_name} SG.") except EC2ResponseError as e: err_msg = f"A problem with security ICMP rule authorization: {e} (code {e.error_code}; status {e.status})" bioblend.log.exception(err_msg) progress['err_msg'] = err_msg # Add rule that allows communication between instances in the same # SG # A flag to indicate if group rule already exists g_rule_exists = False for rule in cmsg.rules: for grant in rule.grants: if == g_rule_exists = True bioblend.log.debug( "Group rule already exists in the SG.") if g_rule_exists: break if not g_rule_exists: try: cmsg.authorize( src_group=cmsg, ip_protocol='tcp', from_port=0, to_port=65535) except EC2ResponseError as e: err_msg = f"A problem with security group group authorization: {e} (code {e.error_code}; status {e.status})" bioblend.log.exception(err_msg) progress['err_msg'] = err_msg"Done configuring '%s' security group", else: bioblend.log.warning( f"Did not create security group '{sg_name}'") return progress
[docs] def rule_exists( self, rules, from_port, to_port, ip_protocol='tcp', cidr_ip=''): """ A convenience method to check if an authorization rule in a security group already exists. """ for rule in rules: if rule.ip_protocol == ip_protocol and rule.from_port == from_port and \ rule.to_port == to_port and cidr_ip in [ip.cidr_ip for ip in rule.grants]: return True return False
[docs] def create_key_pair(self, key_name='cloudman_key_pair'): """ If a key pair with the provided ``key_name`` does not exist, create it. :type sg_name: str :param sg_name: A name for the key pair to be created. :rtype: dict :return: A dictionary containing keys ``name`` (with the value being the name of the key pair that was created), ``error`` (with the value being the error message if there was an error or ``None`` if no error was encountered), and ``material`` (containing the unencrypted PEM encoded RSA private key if the key was created or ``None`` if the key already eixsted). .. versionchanged:: 0.6.1 The return value changed from a tuple to a dict """ progress = {'name': None, 'material': None, 'error': None} kp = None # Check if a key pair under the given name already exists. If it does not, # create it, else return. try: kps = self.ec2_conn.get_all_key_pairs() except EC2ResponseError as e: err_msg = f"Problem getting key pairs: {e} (code {e.error_code}; status {e.status})" bioblend.log.exception(err_msg) progress['error'] = err_msg return progress for akp in kps: if == key_name:"Key pair '%s' already exists; reusing it.", key_name) progress['name'] = return progress try: kp = self.ec2_conn.create_key_pair(key_name) except EC2ResponseError as e: err_msg = f"Problem creating key pair '{key_name}': {e} (code {e.error_code}; status {e.status})" bioblend.log.exception(err_msg) progress['error'] = err_msg return progress"Created key pair '%s'", progress['name'] = progress['material'] = kp.material return progress
[docs] def assign_floating_ip(self, ec2_conn, instance): try: bioblend.log.debug("Allocating a new floating IP address.") address = ec2_conn.allocate_address() except EC2ResponseError: bioblend.log.exception("Exception allocating a new floating IP address")"Associating floating IP %s to instance %s", address.public_ip, ec2_conn.associate_address(, public_ip=address.public_ip)
[docs] def get_status(self, instance_id): """ Check on the status of an instance. ``instance_id`` needs to be a ``boto``-library copatible instance ID (e.g., ``i-8fehrdss``).If ``instance_id`` is not provided, the ID obtained when launching *the most recent* instance is used. Note that this assumes the instance being checked on was launched using this class. Also note that the same class may be used to launch multiple instances but only the most recent ``instance_id`` is kept while any others will to be explicitly specified. This method also allows the required ``ec2_conn`` connection object to be provided at invocation time. If the object is not provided, credentials defined for the class are used (ability to specify a custom ``ec2_conn`` helps in case of stateless method invocations). Return a ``state`` dict containing the following keys: ``instance_state``, ``public_ip``, ``placement``, and ``error``, which capture CloudMan's current state. For ``instance_state``, expected values are: ``pending``, ``booting``, ``running``, or ``error`` and represent the state of the underlying instance. Other keys will return an empty value until the ``instance_state`` enters ``running`` state. """ ec2_conn = self.ec2_conn rs = None state = {'instance_state': "", 'public_ip': "", 'placement': "", 'error': ""} # Make sure we have an instance ID if instance_id is None: err = "Missing instance ID, cannot check the state." bioblend.log.error(err) state['error'] = err return state try: rs = ec2_conn.get_all_instances([instance_id]) if rs is not None: inst_state = rs[0].instances[0].update() public_ip = rs[0].instances[0].ip_address state['public_ip'] = public_ip if inst_state == 'running': # if there's a private ip, but no public ip # attempt auto allocation of floating IP if rs[0].instances[0].private_ip_address and not public_ip: self.assign_floating_ip(ec2_conn, rs[0].instances[0]) # Wait until the CloudMan URL is accessible to return # the data - this may only be correct initially at # bootup for instances that configure themselves for # https - they may ultimately block port 80. However, # we don't have a good way to determine whether to # check using http or https. cm_url = f"http://{public_ip}/cloud" if self._checkURL(cm_url) is True: state['instance_state'] = inst_state state['placement'] = rs[0].instances[0].placement else: state['instance_state'] = 'booting' else: state['instance_state'] = inst_state except Exception as e: err = f"Problem updating instance '{instance_id}' state: {e}" bioblend.log.error(err) state['error'] = err return state
[docs] def get_clusters_pd(self, include_placement=True): """ Return *persistent data* of all existing clusters for this account. :type include_placement: bool :param include_placement: Whether or not to include region placement for the clusters. Setting this option will lead to a longer function runtime. :rtype: dict :return: A dictionary containing keys ``clusters`` and ``error``. The value of ``clusters`` will be a dictionary with the following keys ``cluster_name``, ``persistent_data``, ``bucket_name`` and optionally ``placement`` or an empty list if no clusters were found or an error was encountered. ``persistent_data`` key value is yet another dictionary containing given cluster's persistent data. The value for the ``error`` key will contain a string with the error message. .. versionadded:: 0.3 .. versionchanged:: 0.7.0 The return value changed from a list to a dictionary. """ clusters = [] response = {'clusters': clusters, 'error': None} s3_conn = self.connect_s3(self.access_key, self.secret_key, try: buckets = s3_conn.get_all_buckets() except S3ResponseError as e: response['error'] = f"S3ResponseError getting buckets: {e}" except self.http_exceptions as ex: response['error'] = f"Exception getting buckets: {ex}" if response['error']: bioblend.log.exception(response['error']) return response for bucket in [b for b in buckets if'cm-')]: try: # TODO: first lookup if persistent_data.yaml key exists pd = bucket.get_key('persistent_data.yaml') except S3ResponseError: # This can fail for a number of reasons for non-us and/or # CNAME'd buckets but it is not a terminal error bioblend.log.warning("Problem fetching persistent_data.yaml from bucket %s", bucket) continue if pd: # We are dealing with a CloudMan bucket pd_contents = pd.get_contents_as_string() pd = yaml.load(pd_contents) if 'cluster_name' in pd: cluster_name = pd['cluster_name'] else: for key in bucket.list(): if'.clusterName'): cluster_name ='.clusterName')[0] cluster = {'cluster_name': cluster_name, 'persistent_data': pd, 'bucket_name':} # Look for cluster's placement too if include_placement: placement = self._find_placement(cluster_name, cluster) cluster['placement'] = placement clusters.append(cluster) response['clusters'] = clusters return response
[docs] def get_cluster_pd(self, cluster_name): """ Return *persistent data* (as a dict) associated with a cluster with the given ``cluster_name``. If a cluster with the given name is not found, return an empty dict. .. versionadded:: 0.3 """ cluster = {} clusters = self.get_clusters_pd().get('clusters', []) for c in clusters: if c['cluster_name'] == cluster_name: cluster = c break return cluster
[docs] def connect_ec2(self, a_key, s_key, cloud=None): """ Create and return an EC2-compatible connection object for the given cloud. See ``_get_cloud_info`` method for more details on the requirements for the ``cloud`` parameter. If no value is provided, the class field is used. """ if cloud is None: cloud = ci = self._get_cloud_info(cloud) r = RegionInfo(name=ci['region_name'], endpoint=ci['region_endpoint']) ec2_conn = boto.connect_ec2(aws_access_key_id=a_key, aws_secret_access_key=s_key, is_secure=ci['is_secure'], region=r, port=ci['ec2_port'], path=ci['ec2_conn_path'], validate_certs=False) return ec2_conn
[docs] def connect_s3(self, a_key, s_key, cloud=None): """ Create and return an S3-compatible connection object for the given cloud. See ``_get_cloud_info`` method for more details on the requirements for the ``cloud`` parameter. If no value is provided, the class field is used. """ if cloud is None: cloud = ci = self._get_cloud_info(cloud) if ci['cloud_type'] == 'amazon': calling_format = SubdomainCallingFormat() else: calling_format = OrdinaryCallingFormat() s3_conn = S3Connection( aws_access_key_id=a_key, aws_secret_access_key=s_key, is_secure=ci['is_secure'], port=ci['s3_port'], host=ci['s3_host'], path=ci['s3_conn_path'], calling_format=calling_format) return s3_conn
[docs] def connect_vpc(self, a_key, s_key, cloud=None): """ Establish a connection to the VPC service. TODO: Make this work with non-default clouds as well. """ if cloud is None: cloud = ci = self._get_cloud_info(cloud) r = RegionInfo(name=ci['region_name'], endpoint=ci['region_endpoint']) vpc_conn = boto.connect_vpc( aws_access_key_id=a_key, aws_secret_access_key=s_key, is_secure=ci['is_secure'], region=r, port=ci['ec2_port'], path=ci['ec2_conn_path'], validate_certs=False) return vpc_conn
def _compose_user_data(self, user_provided_data): """ A convenience method used to compose and properly format the user data required when requesting an instance. ``user_provided_data`` is the data provided by a user required to identify a cluster and user other user requirements. """ form_data = {} # Do not include the following fields in the user data but do include # any 'advanced startup fields' that might be added in the future excluded_fields = ['sg_name', 'image_id', 'instance_id', 'kp_name', 'cloud', 'cloud_type', 'public_dns', 'cidr_range', 'kp_material', 'placement', 'flavor_id'] for key, value in user_provided_data.items(): if key not in excluded_fields: form_data[key] = value # If the following user data keys are empty, do not include them in the # request user data udkeys = [ 'post_start_script_url', 'worker_post_start_script_url', 'bucket_default', 'share_string'] for udkey in udkeys: if udkey in form_data and form_data[udkey] == '': del form_data[udkey] # If bucket_default was not provided, add a default value to the user data # (missing value does not play nicely with CloudMan's if not form_data.get( 'bucket_default', None) and form_data['bucket_default'] = # Reuse the ``password`` for the ``freenxpass`` user data option if 'freenxpass' not in form_data and 'password' in form_data: form_data['freenxpass'] = form_data['password'] # Convert form_data into the YAML format ud = yaml.dump(form_data, default_flow_style=False, allow_unicode=False) # Also include connection info about the selected cloud ci = self._get_cloud_info(, as_str=True) return ud + "\n" + ci def _get_cloud_info(self, cloud, as_str=False): """ Get connection information about a given cloud """ ci = {} ci['cloud_type'] = cloud.cloud_type ci['region_name'] = cloud.region_name ci['region_endpoint'] = cloud.region_endpoint ci['is_secure'] = cloud.is_secure ci['ec2_port'] = cloud.ec2_port if cloud.ec2_port != '' else None ci['ec2_conn_path'] = cloud.ec2_conn_path # Include cidr_range only if not empty if cloud.cidr_range != '': ci['cidr_range'] = cloud.cidr_range ci['s3_host'] = cloud.s3_host ci['s3_port'] = cloud.s3_port if cloud.s3_port != '' else None ci['s3_conn_path'] = cloud.s3_conn_path if as_str: ci = yaml.dump(ci, default_flow_style=False, allow_unicode=False) return ci def _get_volume_placement(self, vol_id): """ Returns the placement of a volume (or None, if it cannot be determined) """ try: vol = self.ec2_conn.get_all_volumes(volume_ids=[vol_id]) except EC2ResponseError as ec2e: bioblend.log.error(f"EC2ResponseError querying for volume {vol_id}: {ec2e}") vol = None if vol: return vol[0].zone else: bioblend.log.error("Requested placement of a volume '%s' that does not exist.", vol_id) return None def _find_placement(self, cluster_name, cluster=None): """ Find a placement zone for a cluster with the name ``cluster_name``. By default, this method will search for and fetch given cluster's *persistent data*; alternatively, *persistent data* can be provided via the ``cluster`` parameter. This dict needs to have ``persistent_data`` key with the contents of cluster's *persistent data*. If the cluster or the volume associated with the cluster cannot be found, cluster placement is set to ``None``. :rtype: dict :return: A dictionary with ``placement`` and ``error`` keywords. .. versionchanged:: 0.7.0 The return value changed from a list to a dictionary. """ placement = None response = {'placement': placement, 'error': None} cluster = cluster or self.get_cluster_pd(cluster_name) if cluster and 'persistent_data' in cluster: pd = cluster['persistent_data'] try: if 'placement' in pd: response['placement'] = pd['placement'] elif 'data_filesystems' in pd: # We have v1 format persistent data so get the volume first and # then the placement zone vol_id = pd['data_filesystems']['galaxyData'][0]['vol_id'] response['placement'] = self._get_volume_placement(vol_id) elif 'filesystems' in pd: # V2 format. for fs in [fs for fs in pd['filesystems'] if fs.get( 'kind', None) == 'volume' and 'ids' in fs]: # All volumes must be in the same zone vol_id = fs['ids'][0] response['placement'] = self._get_volume_placement( vol_id) # No need to continue to iterate through # filesystems, if we found one with a volume. break except Exception as exc: response['error'] = \ f"Exception while finding placement for cluster '{cluster_name}'. This can indicate malformed instance data. Or that this method is broken: {exc}" bioblend.log.error(response['error']) response['placement'] = None else: bioblend.log.debug( f"Insufficient info about cluster {cluster_name} to get placement." ) return response
[docs] def find_placements( self, ec2_conn, instance_type, cloud_type, cluster_name=None): """ Find a list of placement zones that support the specified instance type. If ``cluster_name`` is given and a cluster with the given name exist, return a list with only one entry where the given cluster lives. Searching for available zones for a given instance type is done by checking the spot prices in the potential availability zones for support before deciding on a region: Note that, currently, instance-type based zone selection applies only to AWS. For other clouds, all the available zones are returned (unless a cluster is being recreated, in which case the cluster's placement zone is returned sa stored in its persistent data. :rtype: dict :return: A dictionary with ``zones`` and ``error`` keywords. .. versionchanged:: 0.3 Changed method name from ``_find_placements`` to ``find_placements``. Also added ``cluster_name`` parameter. .. versionchanged:: 0.7.0 The return value changed from a list to a dictionary. """ # First look for a specific zone a given cluster is bound to zones = [] response = {'zones': zones, 'error': None} if cluster_name: placement = self._find_placement(cluster_name) if placement.get('error'): response['error'] = placement['error'] return response response['zones'] = placement.get('placement', []) # If placement is not found, look for a list of available zones if not response['zones']: in_the_past = - datetime.timedelta(hours=1) back_compatible_zone = "us-east-1e" for zone in [ z for z in ec2_conn.get_all_zones() if z.state == 'available']: # Non EC2 clouds may not support get_spot_price_history if instance_type is None or cloud_type != 'ec2': zones.append( elif ec2_conn.get_spot_price_history(instance_type=instance_type, end_time=in_the_past.isoformat(), zones.append( # Higher-lettered zones seem to have more availability currently zones.sort(reverse=True) if back_compatible_zone in zones: zones = [back_compatible_zone] + \ [z for z in zones if z != back_compatible_zone] if len(zones) == 0: response['error'] = f"Did not find availabilty zone for {instance_type}" bioblend.log.error(response['error']) zones.append(back_compatible_zone) return response
def _checkURL(self, url): """ Check if the ``url`` is *alive* (i.e., remote server returns code 200(OK) or 401 (unauthorized)). """ try: p = urlparse(url) h = HTTPConnection(p[1]) h.putrequest('HEAD', p[2]) h.endheaders() r = h.getresponse() # CloudMan UI is pwd protected so include 401 if r.status in (200, 401): return True except Exception: # No response or no good response pass return False