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From 635dcbf5a4a5b060ebf417c66789c59ebb28c39f Mon Sep 17 00:00:00 2001
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From: Eduardo Otubo <otubo@redhat.com>
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Date: Wed, 15 May 2019 12:15:28 +0200
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Subject: [PATCH 4/5] DataSourceAzure: Adjust timeout for polling IMDS
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RH-Author: Eduardo Otubo <otubo@redhat.com>
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Message-id: <20190515121529.11191-5-otubo@redhat.com>
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Patchwork-id: 87883
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O-Subject: [rhel-7 cloud-init PATCHv2 4/5] DataSourceAzure: Adjust timeout for polling IMDS
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Bugzilla: 1687565
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RH-Acked-by: Vitaly Kuznetsov <vkuznets@redhat.com>
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RH-Acked-by: Mohammed Gamal <mgamal@redhat.com>
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From: Anh Vo <anhvo@microsoft.com>
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BZ: 1687565
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BRANCH: rhel7/master-18.5
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UPSTREAM: ab6621d8
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BREW: 21696239
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commit ab6621d849b24bb652243e88c79f6f3b446048d7
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Author: Anh Vo <anhvo@microsoft.com>
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Date: Wed May 8 14:54:03 2019 +0000
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DataSourceAzure: Adjust timeout for polling IMDS
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If the IMDS primary server is not available, falling back to the
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secondary server takes about 1s. The net result is that the
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expected E2E time is slightly more than 1s. This change increases
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the timeout to 2s to prevent the infinite loop of timeouts.
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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/DataSourceAzure.py | 15 ++++++++++-----
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tests/unittests/test_datasource/test_azure.py | 10 +++++++---
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2 files changed, 17 insertions(+), 8 deletions(-)
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diff --git a/cloudinit/sources/DataSourceAzure.py b/cloudinit/sources/DataSourceAzure.py
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index c827816..5baf8da 100755
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--- a/cloudinit/sources/DataSourceAzure.py
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+++ b/cloudinit/sources/DataSourceAzure.py
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@@ -57,7 +57,12 @@ AZURE_CHASSIS_ASSET_TAG = '7783-7084-3265-9085-8269-3286-77'
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REPROVISION_MARKER_FILE = "/var/lib/cloud/data/poll_imds"
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REPORTED_READY_MARKER_FILE = "/var/lib/cloud/data/reported_ready"
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AGENT_SEED_DIR = '/var/lib/waagent'
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+
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+# In the event where the IMDS primary server is not
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+# available, it takes 1s to fallback to the secondary one
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+IMDS_TIMEOUT_IN_SECONDS = 2
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IMDS_URL = "http://169.254.169.254/metadata/"
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+
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PLATFORM_ENTROPY_SOURCE = "/sys/firmware/acpi/tables/OEM0"
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# List of static scripts and network config artifacts created by
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@@ -582,9 +587,9 @@ class DataSourceAzure(sources.DataSource):
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return
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self._ephemeral_dhcp_ctx.clean_network()
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else:
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- return readurl(url, timeout=1, headers=headers,
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- exception_cb=exc_cb, infinite=True,
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- log_req_resp=False).contents
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+ return readurl(url, timeout=IMDS_TIMEOUT_IN_SECONDS,
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+ headers=headers, exception_cb=exc_cb,
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+ infinite=True, log_req_resp=False).contents
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except UrlError:
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# Teardown our EphemeralDHCPv4 context on failure as we retry
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self._ephemeral_dhcp_ctx.clean_network()
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@@ -1291,8 +1296,8 @@ def _get_metadata_from_imds(retries):
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headers = {"Metadata": "true"}
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try:
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response = readurl(
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- url, timeout=1, headers=headers, retries=retries,
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- exception_cb=retry_on_url_exc)
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+ url, timeout=IMDS_TIMEOUT_IN_SECONDS, headers=headers,
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+ retries=retries, exception_cb=retry_on_url_exc)
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except Exception as e:
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LOG.debug('Ignoring IMDS instance metadata: %s', e)
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return {}
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diff --git a/tests/unittests/test_datasource/test_azure.py b/tests/unittests/test_datasource/test_azure.py
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index eacf225..bc8b42c 100644
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--- a/tests/unittests/test_datasource/test_azure.py
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+++ b/tests/unittests/test_datasource/test_azure.py
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@@ -163,7 +163,8 @@ class TestGetMetadataFromIMDS(HttprettyTestCase):
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m_readurl.assert_called_with(
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self.network_md_url, exception_cb=mock.ANY,
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- headers={'Metadata': 'true'}, retries=2, timeout=1)
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+ headers={'Metadata': 'true'}, retries=2,
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+ timeout=dsaz.IMDS_TIMEOUT_IN_SECONDS)
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@mock.patch('cloudinit.url_helper.time.sleep')
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@mock.patch(MOCKPATH + 'net.is_up')
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@@ -1789,7 +1790,8 @@ class TestAzureDataSourcePreprovisioning(CiTestCase):
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headers={'Metadata': 'true',
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'User-Agent':
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'Cloud-Init/%s' % vs()
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- }, method='GET', timeout=1,
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+ }, method='GET',
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+ timeout=dsaz.IMDS_TIMEOUT_IN_SECONDS,
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url=full_url)])
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self.assertEqual(m_dhcp.call_count, 2)
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m_net.assert_any_call(
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@@ -1826,7 +1828,9 @@ class TestAzureDataSourcePreprovisioning(CiTestCase):
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headers={'Metadata': 'true',
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'User-Agent':
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'Cloud-Init/%s' % vs()},
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- method='GET', timeout=1, url=full_url)])
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+ method='GET',
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+ timeout=dsaz.IMDS_TIMEOUT_IN_SECONDS,
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+ url=full_url)])
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self.assertEqual(m_dhcp.call_count, 2)
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m_net.assert_any_call(
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broadcast='192.168.2.255', interface='eth9', ip='192.168.2.9',
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--
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1.8.3.1
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