cloud-init on azure with dual stack needs to add route-metric for dhcp6 also

[Dan Streetman]

cloud-init on azure generates netplan yaml that includes dhcp4 with the dhcp4-overrides of route-metric, i.e.:

            dhcp4: true
            dhcp4-overrides:
                route-metric: 100

however netplan requires the same route-metric for dhcp4 and dhcp6 as networkd doesn't allow specifying separate metrics for 4 vs 6, so when azure is setup with dual-stack the netplan yaml is not valid for netplan, i.e.:

            dhcp4: true
            dhcp4-overrides:
                route-metric: 100
            dhcp6: true

which causes netplan to exit with error:

Stderr: ERROR: eth0: networkd requires that route-metric has the same value in both dhcp4_overrides and dhcp6_overrides

[Server Team CI bot (server-team-bot)]

This bug is fixed with commit 02f07b66 to cloud-init on branch master.
To view that commit see the following URL:
https://git.launchpad.net/cloud-init/commit/?id=02f07b66

[Chad Smith (chad.smith)]

This bug is believed to be fixed in cloud-init in version 19.2-80. If this is still a problem for you, please make a comment and set the state back to New

Thank you.

[James Falcon (falcojr)]

Tracked in Github Issues as https://github.com/canonical/cloud-init/issues/3485