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[Bug 1850988] Re: [Cloud-init 18.5][CentOS 7 on vSphere] Crash when configuring static dual-stack (IPv4 + IPv6) networking

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This bug is believed to be fixed in cloud-init in version 20.1. If this
is still a problem for you, please make a comment and set the state back
to New

Thank you.

** Changed in: cloud-init
       Status: Fix Committed => Fix Released

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https://bugs.launchpad.net/bugs/1850988

Title:
  [Cloud-init 18.5][CentOS 7 on vSphere] Crash when configuring static
  dual-stack (IPv4 + IPv6) networking

Status in cloud-init:
  Fix Released

Bug description:
  Environment: 
    - Stock CentOS 7 image template (comes with OpenVM tools) with cloud-init 18.5 installed 
    - Single NIC VM
    - vSphere 6.5 hypervisor

  Repro steps: 
    - Customize the VM with a vSphere customization spec that has NIC setting with static IPv4 and IPv6 information
    - OpenVM tools running inside guest will delegate guest customization to cloud-init 
    - Cloud-init crashes with ValueError: Unknown subnet type 'static6' found for interface 'ens192'  . See the following relevant excerts and stacktrace (found in /var/log/cloudinit.log): 

  [...snip...]
  2019-11-01 02:23:41,899 - DataSourceOVF.py[DEBUG]: Found VMware Customization Config File at /var/run/vmware-imc/cust.cfg
  2019-11-01 02:23:41,899 - config_file.py[INFO]: Parsing the config file /var/run/vmware-imc/cust.cfg.
  2019-11-01 02:23:41,900 - config_file.py[DEBUG]: FOUND CATEGORY = 'NETWORK'
  2019-11-01 02:23:41,900 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NETWORK|NETWORKING' = 'yes'
  2019-11-01 02:23:41,900 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NETWORK|BOOTPROTO' = 'dhcp'
  2019-11-01 02:23:41,900 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NETWORK|HOSTNAME' = 'pr-centos-ci'
  2019-11-01 02:23:41,900 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NETWORK|DOMAINNAME' = 'gsslabs.local'
  2019-11-01 02:23:41,900 - config_file.py[DEBUG]: FOUND CATEGORY = 'NIC-CONFIG'
  2019-11-01 02:23:41,900 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NIC-CONFIG|NICS' = 'NIC1'
  2019-11-01 02:23:41,900 - config_file.py[DEBUG]: FOUND CATEGORY = 'NIC1'
  2019-11-01 02:23:41,902 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NIC1|MACADDR' = '00:50:56:89:b7:48'
  2019-11-01 02:23:41,902 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NIC1|ONBOOT' = 'yes'
  2019-11-01 02:23:41,902 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NIC1|IPv4_MODE' = 'BACKWARDS_COMPATIBLE'
  2019-11-01 02:23:41,902 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NIC1|BOOTPROTO' = 'static'
  2019-11-01 02:23:41,902 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NIC1|IPADDR' = '1.1.1.4'
  2019-11-01 02:23:41,902 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NIC1|NETMASK' = '255.255.255.0'
  2019-11-01 02:23:41,902 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NIC1|IPv6ADDR|1' = '2600::10'
  2019-11-01 02:23:41,902 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NIC1|IPv6NETMASK|1' = '64'
  2019-11-01 02:23:41,903 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'NIC1|IPv6GATEWAY|1' = '2600::1'
  2019-11-01 02:23:41,903 - config_file.py[DEBUG]: FOUND CATEGORY = 'DNS'
  2019-11-01 02:23:41,903 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'DNS|DNSFROMDHCP' = 'no'
  2019-11-01 02:23:41,904 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'DNS|SUFFIX|1' = 'sqa.local'
  2019-11-01 02:23:41,904 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'DNS|NAMESERVER|1' = '192.168.0.10'
  2019-11-01 02:23:41,904 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'DNS|NAMESERVER|2' = 'fc00:10:118:192:250:56ff:fe89:64a8'
  2019-11-01 02:23:41,904 - config_file.py[DEBUG]: FOUND CATEGORY = 'DATETIME'
  2019-11-01 02:23:41,904 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'DATETIME|TIMEZONE' = 'Asia/Kolkata'
  2019-11-01 02:23:41,904 - config_file.py[DEBUG]: ADDED KEY-VAL :: 'DATETIME|UTC' = 'no'
  2019-11-01 02:23:41,904 - DataSourceOVF.py[DEBUG]: Preparing the Network configuration
  2019-11-01 02:23:41,907 - util.py[DEBUG]: Running command ['ip', 'addr', 'show'] with allowed return codes [0] (shell=False, capture=True)
  2019-11-01 02:23:41,926 - config_nic.py[INFO]: Configuring the interfaces file
  2019-11-01 02:23:41,927 - config_nic.py[INFO]: Debian OS not detected. Skipping the configure step
  2019-11-01 02:23:41,927 - util.py[DEBUG]: Recursively deleting /var/run/vmware-imc

  [...snip...]

  2019-11-01 02:23:43,225 - stages.py[INFO]: Applying network configuration from ds bringup=False: {'version': 1, 'config': [{'subnets': [{'control': 'auto', 'netmask': '255.255.255.0', 'type': 'static', 'address': '1.1.1.4'}, {'netmask': '64', 'type': 'static6', 'address': '2600::10'}], 'type': 'physical', 'name': u'ens192', 'mac_address': '00:50:56:89:b7:48'}, {'search': ['sqa.local'], 'type': 'nameserver', 'address': ['192.168.0.10', 'fc00:10:118:192:250:56ff:fe89:64a8']}]}
  2019-11-01 02:23:43,226 - __init__.py[DEBUG]: Selected renderer 'sysconfig' from priority list: None
  2019-11-01 02:23:43,244 - util.py[WARNING]: failed stage init-local
  2019-11-01 02:23:43,249 - util.py[DEBUG]: failed stage init-local
  Traceback (most recent call last):
    File "/usr/lib/python2.7/site-packages/cloudinit/cmd/main.py", line 652, in status_wrapper
      ret = functor(name, args)
    File "/usr/lib/python2.7/site-packages/cloudinit/cmd/main.py", line 362, in main_init
      init.apply_network_config(bring_up=bool(mode != sources.DSMODE_LOCAL))
    File "/usr/lib/python2.7/site-packages/cloudinit/stages.py", line 672, in apply_network_config
      return self.distro.apply_network_config(netcfg, bring_up=bring_up)
    File "/usr/lib/python2.7/site-packages/cloudinit/distros/__init__.py", line 178, in apply_network_config
      dev_names = self._write_network_config(netconfig)
    File "/usr/lib/python2.7/site-packages/cloudinit/distros/rhel.py", line 65, in _write_network_config
      return self._supported_write_network_config(netconfig)
    File "/usr/lib/python2.7/site-packages/cloudinit/distros/__init__.py", line 93, in _supported_write_network_config
      renderer.render_network_config(network_config)
    File "/usr/lib/python2.7/site-packages/cloudinit/net/renderer.py", line 56, in render_network_config
      templates=templates, target=target)
    File "/usr/lib/python2.7/site-packages/cloudinit/net/sysconfig.py", line 641, in render_network_state
      templates=templates).items():
    File "/usr/lib/python2.7/site-packages/cloudinit/net/sysconfig.py", line 614, in _render_sysconfig
      cls._render_physical_interfaces(network_state, iface_contents)
    File "/usr/lib/python2.7/site-packages/cloudinit/net/sysconfig.py", line 472, in _render_physical_interfaces
      cls._render_subnets(iface_cfg, iface_subnets)
    File "/usr/lib/python2.7/site-packages/cloudinit/net/sysconfig.py", line 345, in _render_subnets
      iface_cfg.name))
  ValueError: Unknown subnet type 'static6' found for interface 'ens192'

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