OracleLinux8 is not listed as a variant of RHEL8. Network renderer does not work

[Brandon Crowe]

When trying to render network config for Oracle Linux 8, cloud-init fails because the distro is not listed as a variant, and because of this, it selects the wrong renderer.

Cloud-init V 21.4
OS: Oracle Linux 8.5
Cloud: VSphere
Datasource: VMware
Metadata:
# cloud-init
instance-id: ITD-TerraformTest-01
local-hostname: ITD-TerraformTest-01
network:
  renderers: ['sysconfig'] # attempt to force renderer
  version: 1
  config:
    - type: physical
      name: ens192
      subnets:
        - type: static
          address: "192.168.20.57/24"
          gateway: "192.168.20.254"
          dns_nameservers:
            - "192.168.20.104"
            - "8.8.8.8"
          dns_search:
            - "fairwarning.com"

userdata:
system_info:
  network:
    renderers: ['sysconfig']
bootcmd:
    - ifdown ens192
    - sed -i 's/NM_CONTROLLED=no/NM_CONTROLLED=yes/g' /etc/sysconfig/network-scripts/ifcfg-ens192
    - nmcli connection reload
    - ifup ens192

CLoud-init log failure:
KeyError: "getpwnam(): name not found: 'systemd-network'"

The above exception was the direct cause of the following exception:

Traceback (most recent call last):
  File "/usr/local/lib/python3.6/site-packages/cloud_init-21.4-py3.6.egg/cloudinit/cmd/main.py", line 689, in status_wrapper
    ret = functor(name, args)
  File "/usr/local/lib/python3.6/site-packages/cloud_init-21.4-py3.6.egg/cloudinit/cmd/main.py", line 398, in main_init
    init.apply_network_config(bring_up=bring_up_interfaces)
  File "/usr/local/lib/python3.6/site-packages/cloud_init-21.4-py3.6.egg/cloudinit/stages.py", line 836, in apply_network_config
    netcfg, bring_up=bring_up)
  File "/usr/local/lib/python3.6/site-packages/cloud_init-21.4-py3.6.egg/cloudinit/distros/__init__.py", line 222, in apply_netwo rk_config
    self._write_network_state(network_state)
  File "/usr/local/lib/python3.6/site-packages/cloud_init-21.4-py3.6.egg/cloudinit/distros/__init__.py", line 125, in _write_netw ork_state
    renderer.render_network_state(network_state)
  File "/usr/local/lib/python3.6/site-packages/cloud_init-21.4-py3.6.egg/cloudinit/net/networkd.py", line 226, in render_network_ state
    self.create_network_file(k, v, fp_nwkd)
  File "/usr/local/lib/python3.6/site-packages/cloud_init-21.4-py3.6.egg/cloudinit/net/networkd.py", line 215, in create_network_ file
    util.chownbyname(net_fn, net_fn_owner, net_fn_owner)
  File "/usr/local/lib/python3.6/site-packages/cloud_init-21.4-py3.6.egg/cloudinit/util.py", line 1434, in chownbyname
    raise OSError("Unknown user or group: %s" % (e)) from e
OSError: Unknown user or group: "getpwnam(): name not found: 'systemd-network'"

[Brett Holman (holmanb)]

Oracle Linux is not yet supported[1]. There is an open PR[2] to add support for OL8, but some changes are required before it can be merged. If/when that gets merged it should be supported.

[1] https://cloudinit.readthedocs.io/en/latest/topics/availability.html
[2] https://github.com/canonical/cloud-init/pull/1247

[James Falcon (falcojr)]

Tracked in Github Issues as https://github.com/canonical/cloud-init/issues/3947