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# Author: Antti Myyrä <antti.myyra@upcloud.com> # # This file is part of cloud-init. See LICENSE file for license information. # UpCloud server metadata API: # https://developers.upcloud.com/1.3/8-servers/#metadata-service import logging from cloudinit import net as cloudnet from cloudinit import sources, util from cloudinit.net.dhcp import NoDHCPLeaseError from cloudinit.net.ephemeral import EphemeralDHCPv4 from cloudinit.sources.helpers import upcloud as uc_helper LOG = logging.getLogger(__name__) BUILTIN_DS_CONFIG = {"metadata_url": "http://169.254.169.254/metadata/v1.json"} # Wait for a up to a minute, retrying the meta-data server # every 2 seconds. MD_RETRIES = 30 MD_TIMEOUT = 2 MD_WAIT_RETRY = 2 class DataSourceUpCloud(sources.DataSource): dsname = "UpCloud" # We'll perform DHCP setup only in init-local, see DataSourceUpCloudLocal perform_dhcp_setup = False def __init__(self, sys_cfg, distro, paths): sources.DataSource.__init__(self, sys_cfg, distro, paths) self.distro = distro self.metadata = dict() self.ds_cfg = util.mergemanydict( [ util.get_cfg_by_path(sys_cfg, ["datasource", "UpCloud"], {}), BUILTIN_DS_CONFIG, ] ) self.metadata_address = self.ds_cfg["metadata_url"] self.retries = self.ds_cfg.get("retries", MD_RETRIES) self.timeout = self.ds_cfg.get("timeout", MD_TIMEOUT) self.wait_retry = self.ds_cfg.get("wait_retry", MD_WAIT_RETRY) self._network_config = None self.metadata_full = None def _get_sysinfo(self): return uc_helper.read_sysinfo() def _read_metadata(self): return uc_helper.read_metadata( self.metadata_address, timeout=self.timeout, sec_between=self.wait_retry, retries=self.retries, ) def _get_data(self): (is_upcloud, server_uuid) = self._get_sysinfo() # only proceed if we know we are on UpCloud if not is_upcloud: return False LOG.info("Running on UpCloud. server_uuid=%s", server_uuid) if self.perform_dhcp_setup: # Setup networking in init-local stage. try: LOG.debug("Finding a fallback NIC") nic = cloudnet.find_fallback_nic() LOG.debug("Discovering metadata via DHCP interface %s", nic) with EphemeralDHCPv4(self.distro, nic): md = self._read_metadata() except (NoDHCPLeaseError, sources.InvalidMetaDataException) as e: util.logexc(LOG, str(e)) return False else: try: LOG.debug( "Discovering metadata without DHCP-configured networking" ) md = self._read_metadata() except sources.InvalidMetaDataException as e: util.logexc(LOG, str(e)) LOG.info( "No DHCP-enabled interfaces available, " "unable to fetch metadata for %s", server_uuid, ) return False self.metadata_full = md self.metadata["instance-id"] = md.get("instance_id", server_uuid) self.metadata["local-hostname"] = md.get("hostname") self.metadata["network"] = md.get("network") self.metadata["public-keys"] = md.get("public_keys") self.metadata["availability_zone"] = md.get("region", "default") self.vendordata_raw = md.get("vendor_data", None) self.userdata_raw = md.get("user_data", None) return True def check_instance_id(self, sys_cfg): return sources.instance_id_matches_system_uuid(self.get_instance_id()) @property def network_config(self): """ Configure the networking. This needs to be done each boot, since the IP and interface information might have changed due to reconfiguration. """ if self._network_config: return self._network_config raw_network_config = self.metadata.get("network") if not raw_network_config: raise RuntimeError( "Unable to get network meta-data from server...." ) self._network_config = uc_helper.convert_network_config( raw_network_config, ) return self._network_config class DataSourceUpCloudLocal(DataSourceUpCloud): """ Run in init-local using a DHCP discovery prior to metadata crawl. In init-local, no network is available. This subclass sets up minimal networking with dhclient on a viable nic so that it can talk to the metadata service. If the metadata service provides network configuration then render the network configuration for that instance based on metadata. """ perform_dhcp_setup = True # Get metadata network config if present # Used to match classes to dependencies datasources = [ (DataSourceUpCloudLocal, (sources.DEP_FILESYSTEM,)), (DataSourceUpCloud, (sources.DEP_FILESYSTEM, sources.DEP_NETWORK)), ] # Return a list of data sources that match this set of dependencies def get_datasource_list(depends): return sources.list_from_depends(depends, datasources)