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From f54ebeac5b95c7481718e09c4598a86bc1a8dcfb Mon Sep 17 00:00:00 2001
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From: Eduardo Otubo <otubo@redhat.com>
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Date: Wed, 3 Jul 2019 13:14:53 +0200
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Subject: [PATCH] Azure: Return static fallback address as if failed to find
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endpoint
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RH-Author: Eduardo Otubo <otubo@redhat.com>
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Message-id: <20190703131453.15811-1-otubo@redhat.com>
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Patchwork-id: 89354
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O-Subject: [RHEL-7.8 cloud-init PATCH] Azure: Return static fallback address as if failed to find endpoint
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Bugzilla: 1726701
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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RH-Acked-by: Mohammed Gamal <mgamal@redhat.com>
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BZ: 1687565
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BRANCH: rhel7/master-18.5
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UPSTREAM: baa478546d8cac98a706010699d64f8c2f70b5bf
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BREW: 22476988
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commit aefb0f1c281740ef307116509057770062d61375
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Author: Jason Zions (MSFT) <jasonzio@microsoft.com>
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Date: Fri May 10 18:38:55 2019 +0000
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Azure: Return static fallback address as if failed to find endpoint
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The Azure data source helper attempts to use information in the dhcp
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lease to find the Wireserver endpoint (IP address). Under some unusual
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circumstances, those attempts will fail. This change uses a static
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address, known to be always correct in the Azure public and sovereign
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clouds, when the helper fails to locate a valid dhcp lease. This
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address is not guaranteed to be correct in Azure Stack environments;
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it's still best to use the information from the lease whenever possible.
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Signed-off-by: Eduardo Otubo <otubo@redhat.com>
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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cloudinit/sources/helpers/azure.py | 14 +++++++++++---
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tests/unittests/test_datasource/test_azure_helper.py | 9 +++++++--
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2 files changed, 18 insertions(+), 5 deletions(-)
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diff --git a/cloudinit/sources/helpers/azure.py b/cloudinit/sources/helpers/azure.py
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index d3af05e..82c4c8c 100755
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--- a/cloudinit/sources/helpers/azure.py
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+++ b/cloudinit/sources/helpers/azure.py
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@@ -20,6 +20,9 @@ from cloudinit.reporting import events
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LOG = logging.getLogger(__name__)
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+# This endpoint matches the format as found in dhcp lease files, since this
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+# value is applied if the endpoint can't be found within a lease file
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+DEFAULT_WIRESERVER_ENDPOINT = "a8:3f:81:10"
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azure_ds_reporter = events.ReportEventStack(
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name="azure-ds",
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@@ -297,7 +300,12 @@ class WALinuxAgentShim(object):
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@azure_ds_telemetry_reporter
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def _get_value_from_leases_file(fallback_lease_file):
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leases = []
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- content = util.load_file(fallback_lease_file)
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+ try:
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+ content = util.load_file(fallback_lease_file)
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+ except IOError as ex:
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+ LOG.error("Failed to read %s: %s", fallback_lease_file, ex)
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+ return None
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+
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LOG.debug("content is %s", content)
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option_name = _get_dhcp_endpoint_option_name()
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for line in content.splitlines():
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@@ -372,9 +380,9 @@ class WALinuxAgentShim(object):
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fallback_lease_file)
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value = WALinuxAgentShim._get_value_from_leases_file(
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fallback_lease_file)
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-
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if value is None:
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- raise ValueError('No endpoint found.')
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+ LOG.warning("No lease found; using default endpoint")
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+ value = DEFAULT_WIRESERVER_ENDPOINT
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endpoint_ip_address = WALinuxAgentShim.get_ip_from_lease_value(value)
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LOG.debug('Azure endpoint found at %s', endpoint_ip_address)
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diff --git a/tests/unittests/test_datasource/test_azure_helper.py b/tests/unittests/test_datasource/test_azure_helper.py
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index 0255616..bd006ab 100644
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--- a/tests/unittests/test_datasource/test_azure_helper.py
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+++ b/tests/unittests/test_datasource/test_azure_helper.py
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@@ -67,12 +67,17 @@ class TestFindEndpoint(CiTestCase):
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self.networkd_leases.return_value = None
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def test_missing_file(self):
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- self.assertRaises(ValueError, wa_shim.find_endpoint)
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+ """wa_shim find_endpoint uses default endpoint if leasefile not found
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+ """
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+ self.assertEqual(wa_shim.find_endpoint(), "168.63.129.16")
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def test_missing_special_azure_line(self):
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+ """wa_shim find_endpoint uses default endpoint if leasefile is found
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+ but does not contain DHCP Option 245 (whose value is the endpoint)
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+ """
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self.load_file.return_value = ''
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self.dhcp_options.return_value = {'eth0': {'key': 'value'}}
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- self.assertRaises(ValueError, wa_shim.find_endpoint)
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+ self.assertEqual(wa_shim.find_endpoint(), "168.63.129.16")
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@staticmethod
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def _build_lease_content(encoded_address):
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--
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1.8.3.1
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