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68ce5c2747
LookupExtInterface() constructs a backend.ExternalInterface but never
sets the IfaceName field, leaving it as an empty string. When the VXLAN
device (flannel.1) is deleted — e.g. because the parent interface
specified via --flannel-iface transiently disappears — the recreation
code in vxlan_network.go:165 calls net.InterfaceByName(""), which
always fails. This puts flannel into an unrecoverable retry loop:
external interface not found, retrying in 30s
The fix adds IfaceName: iface.Name to the struct literal. The iface
variable already holds the correct *net.Interface; its Name field just
needs to be copied into the IfaceName string that the VXLAN recreation
path reads.
This is a one-line change that enables the VXLAN device recreation
logic added in flannel PR #2272 (v0.27.4+) to actually work when
flannel is embedded in K3s.
Affects any deployment using --flannel-iface with an overlay network
(Tailscale, Nebula, ZeroTier) where the parent interface can
transiently restart.
Ref: https://github.com/k3s-io/k3s/issues/12436
Ref: https://github.com/flannel-io/flannel/issues/2247
Signed-off-by: Jay Kubo <6161465+jkubo@users.noreply.github.com>
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| .. | ||
| flannel.go | ||
| setup.go | ||
| setup_linux.go | ||
| setup_test.go | ||
| setup_windows.go | ||