kubernetes/kops · error

error creating router interface: %v

Error message

error creating router interface: %v

What it means

Adding an interface to a router failed at the Neutron API. The operation is retried with backoff; persistent failure usually means the subnet/port cannot be attached, e.g. already attached, conflict, or wrong state.

Source

Thrown at upup/pkg/fi/cloudup/openstack/router.go:91

		return r, err
	} else if done {
		return r, nil
	} else {
		return r, wait.ErrWaitTimeout
	}
}

func (c *openstackCloud) CreateRouterInterface(routerID string, opt routers.AddInterfaceOptsBuilder) (*routers.InterfaceInfo, error) {
	return createRouterInterface(c, routerID, opt)
}

func createRouterInterface(c OpenstackCloud, routerID string, opt routers.AddInterfaceOptsBuilder) (*routers.InterfaceInfo, error) {
	var i *routers.InterfaceInfo

	done, err := vfs.RetryWithBackoff(writeBackoff, func() (bool, error) {
		v, err := routers.AddInterface(context.TODO(), c.NetworkingClient(), routerID, opt).Extract()
		if err != nil {
			return false, fmt.Errorf("error creating router interface: %v", err)
		}
		i = v
		return true, nil
	})
	if err != nil {
		return i, err
	} else if done {
		return i, nil
	} else {
		return i, wait.ErrWaitTimeout
	}
}

func (c *openstackCloud) DeleteRouterInterface(routerID string, opt routers.RemoveInterfaceOptsBuilder) error {
	return deleteRouterInterface(c, routerID, opt)
}

func deleteRouterInterface(c OpenstackCloud, routerID string, opt routers.RemoveInterfaceOptsBuilder) error {

View on GitHub (pinned to 4c8573c808)

Solutions

1. Inspect the wrapped error for the conflict reason
2. Verify the subnet is not already attached to another router interface
3. Retry after resolving the conflict

When it happens

Trigger: Thrown at upup/pkg/fi/cloudup/openstack/router.go:91 when the library encounters an invalid state.

Common situations: See trigger scenarios.

AI-assisted analysis of kubernetes/kops@4c8573c808 (2026-09-05). Data as JSON: /api/errors/2eba27f14dcb6243. Report an issue: GitHub.