Azure data source assumes network is driven via dhcpclient

[Robert Schweikert]

The Azure data source assumes that the network is set up by dhcpclient. During cloud-init initialization the following traceback is generated:

Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/DataSourceAzure.py", line 668, in _negotiate
    fabric_data = metadata_func()
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 36, in impl
    return func(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 458, in get_metadata_from_fabric
    return shim.register_with_azure_and_fetch_data(pubkey_info=pubkey_info)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 36, in impl
    return func(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 393, in register_with_azure_and_fetch_data
    'http://{0}/machine/?comp=goalstate'.format(self.endpoint))
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 272, in endpoint
    self.dhcpoptions)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 36, in impl
    return func(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 374, in find_endpoint
    fallback_lease_file)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 36, in impl
    return func(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 300, in _get_value_from_leases_file
    content = util.load_file(fallback_lease_file)
  File "/usr/lib/python3.6/site-packages/cloudinit/util.py", line 1359, in load_file
    with open(fname, 'rb') as ifh:
FileNotFoundError: [Errno 2] No such file or directory: '/var/lib/dhcp/dhclient.eth0.leases'

[Robert Schweikert (rjschwei)]

On SUSE the option of interest is in /var/lib/wicked/lease-eth0-dhcp-ipv4.xml

[Robert Schweikert (rjschwei)]

This happens with 19.1, i.e. the current SUSE package. In master the code in question is wrapped with a try: except: block that avoids the traceback

 def _get_value_from_leases_file(fallback_lease_file):
        leases = []
        try:
            content = util.load_file(fallback_lease_file)
        except IOError as ex:
            LOG.error("Failed to read %s: %s", fallback_lease_file, ex)
            return None

Adding this to 19.1 leads to:

2019-09-25 13:03:35,101 - DataSourceAzure.py[WARNING]: Error communicating with Azure fabric; You may experience.connectivity issues.
Traceback (most recent call last):
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/DataSourceAzure.py", line 668, in _negotiate
    fabric_data = metadata_func()
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 36, in impl
    return func(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 462, in get_metadata_from_fabric
    return shim.register_with_azure_and_fetch_data(pubkey_info=pubkey_info)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 36, in impl
    return func(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 397, in register_with_azure_and_fetch_data
    'http://{0}/machine/?comp=goalstate'.format(self.endpoint))
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 272, in endpoint
    self.dhcpoptions)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 36, in impl
    return func(*args, **kwargs)
  File "/usr/lib/python3.6/site-packages/cloudinit/sources/helpers/azure.py", line 381, in find_endpoint
    raise ValueError('No endpoint found.')
ValueError: No endpoint found.

I am going to stop digging at this point.

[James Falcon (falcojr)]

Tracked in Github Issues as https://github.com/canonical/cloud-init/issues/3451