containernetworking / plugins / 34466296268

53%

master: 55%

Pull #1257

github

host-device: copy host interface IP addresses and routes into container

Add a new configuration option `useInterfaceNetwork` that instructs the
host-device plugin to capture the interface's IP addresses and routes
from the host before moving the device into the container namespace,
and then apply them inside the container.

This is critical for virtual environments (AWS, IBM Cloud, GPC) where
the cloud provider configures IP addresses and routes directly on the
network device. In these environments, there is no traditional IPAM
source; the ground truth for L3 configuration lives on the host
interface itself.

When `useInterfaceNetwork` is enabled, the plugin:
  - Captures all global-scope addresses and non-local routes from the
    host device before moving it into the container namespace.
  - Applies the captured addresses and routes to the interface inside
    the container.
  - Reports the addresses and routes in the CNI result (merged with
    any IPAM result if an IPAM plugin is also configured).

NOTE: The interface configuration on the host node must be persistent.
When the device is moved back to the host (via DEL) and renamed to its
original name, the system's network management service (e.g.
NetworkManager, systemd-networkd, cloud-init, or cloud-specific agents)
is expected to detect the device and re-apply the IP addresses and
routes. This plugin does NOT re-configure the host interface on DEL; it
relies on the node's network configuration being declarative and
reconciled by the platform's networking stack.

Signed-off-by: Sebastian Sch <sebassch@gmail.com>

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