Disable cloud-init network hotplug on Ubuntu 24.04 for Cilium and Ama…

[yilmaz-burak]

…zon VPC CNI

On Ubuntu 24.04+, cloud-init network hotplug is enabled by default (canonical/cloud-init#4799). This causes cloud-init to reconfigure netplan when CNIs dynamically attach secondary ENIs, breaking BPF masquerade and network routing functionality.

This fix disables cloud-init network hotplug by creating a configuration file at /etc/cloud/cloud.cfg.d/99-disable-network-hotplug.cfg that sets updates.network.when to an empty list, preventing cloud-init from handling any network update events including hotplug.

Fixes #17881

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: yilmaz-burak / name: Burak Yılmaz (3128f05)

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[hakman]

/ok-to-test

[hakman]

/cc @rifelpet

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[hakman]

/retest