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feat(metallb): add option to limit MetalLB layer2 announcements to specific interfaces (#696)

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- roles/k3s_server_post/templates/metallb.crs.j2: render spec.interfaces in the
  L2Advertisement when metal_lb_interfaces is a non-empty list, so MetalLB only
  announces on the configured interfaces. Empty list (default) keeps announcing
  on all interfaces, preserving existing behavior.
- roles/k3s_server_post/defaults/main.yml: add metal_lb_interfaces: [] default
- roles/k3s_server_post/meta/main.yml: add metal_lb_interfaces argument_spec
- inventory/sample/group_vars/all.yml: document the new sample variable
- .github/scripts/test-metallb-interfaces.py: regression test rendering the
  template for empty/single/multiple interfaces and confirming the BGP path is
  unaffected
- .pre-commit-config.yaml: wire the new test into pre-commit

Co-authored-by: Leo <leo@kuboschek.me>
This commit is contained in:
Techno Tim
2026-08-05 02:48:24 -05:00
committed by GitHub
parent 010551b8d2
commit 52c086d638
6 changed files with 116 additions and 0 deletions
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inventory/sample/group_vars/all.yml
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@@ -120,6 +120,12 @@ metal_lb_controller_tag_version: v0.16.0
# metallb ip range for load balancer
metal_lb_ip_range: 192.168.30.80-192.168.30.90
# (optional) limit MetalLB layer2 announcements to specific network interfaces.
# Leave empty (default) to announce on all interfaces.
# metal_lb_interfaces:
# - eth1
# - eth2
# Only enable if your nodes are proxmox LXC nodes, make sure to configure your proxmox nodes
# in your hosts.ini file.
# Please read https://gist.github.com/triangletodd/02f595cd4c0dc9aac5f7763ca2264185 before using this.