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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
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parent 010551b8d2
commit 52c086d638
6 changed files with 116 additions and 0 deletions
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roles/k3s_server_post/defaults/main.yml
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@@ -39,4 +39,5 @@ group_name_master: master
metal_lb_mode: layer2
metal_lb_available_timeout: 240s
metal_lb_controller_tag_version: v0.16.0
metal_lb_interfaces: []
metal_lb_ip_range: 192.168.30.80-192.168.30.90