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BGP is about to be added to a network that currently works, where a bad advertisement blackholes the house. That needs somewhere to fail first. Three Debian nodes (4 GB / 2 vCPU) on the OVS `vlan2` access ports running k3s with flannel disabled, so Cilium is the CNI under test. Three rather than two because ECMP is only meaningfully tested if a node can be drained and more than one path survives. VMs rather than k3d: the thing under test is eBGP between Cilium and VyOS across the switch fabric, nodes peering with the router's bond0.2 leg, directly connected. k3d would put the nodes on a container bridge -- a different L2 path, proving something else. (It also wants Docker; this host has podman.) The existing micro VMs are Alpine with 256 MB and 1 vCPU, which is not close to enough. Debian rather than the sim's Alpine base: glibc, a stock kernel that Cilium's eBPF probes are tested against, and cloud-init that actually applies network-config -- the Alpine base notably does not. One trap worth recording. An earlier draft called `selected_vlans "$K8S_VLAN"` before `ovs_up`, and since `ovs_up` re-defines the libvirt network from SELECTED, that silently deleted the portgroups for every other VLAN. Running VMs kept working -- their taps were already attached -- so nothing complained until the ISP VMs needed vlan51 and vlan53 and could not be attached. It now selects every VLAN. The generated kubeconfig is gitignored: it carries cluster-admin credentials and is one `git add -A` away from being committed. Regenerate with `k8s-up.sh --kubeconfig`. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01DMVzWZgiKW2wquf5z8S1yH
9 lines
217 B
Plaintext
9 lines
217 B
Plaintext
# runtime artifacts, not source
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*.log
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labsim_matrix_lib.py
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__pycache__/
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# Cluster-admin credentials for the rehearsal cluster, written by
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# `k8s-up.sh --kubeconfig`. Regenerate it rather than commit it.
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*.kubeconfig
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