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mtu and kubernetes worker version

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This commit is contained in:
Enrico Candino
2026-06-13 00:50:20 +02:00
parent 81bd5100b9
commit dad40e9c40
1 changed files with 17 additions and 4 deletions
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.github/workflows/test-conformance-hcp.yaml
+17 -4
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@@ -170,8 +170,16 @@ jobs:
# Create a bridge so both VMs share an L2 segment with unique routable IPs.
# Required because QEMU `-net user` gives every VM the same 10.0.2.15 NAT
# address, which breaks flannel VXLAN between workers.
#
# MTU is set to 1400 end-to-end (bridge, TAPs, VM ens3 via cloud-init).
# The path traverses flannel VXLAN inside the virtual cluster AND the
# host's k3s pod network — each strips ~50 bytes for VXLAN headers.
# Defaulting to 1500 across the stack leaves no headroom and PMTUD
# through nested NAT/forwarding is unreliable; 1400 fits both layers
# without fragmentation.
sudo ip link add name k3kbr0 type bridge
sudo ip addr add 192.168.100.1/24 dev k3kbr0
sudo ip link set k3kbr0 mtu 1400
sudo ip link set k3kbr0 up
# NAT outbound so VMs can reach the internet (image pulls etc).
@@ -183,10 +191,12 @@ jobs:
# One TAP per VM, attached to the bridge.
sudo ip tuntap add tap-w1 mode tap
sudo ip link set tap-w1 master k3kbr0
sudo ip link set tap-w1 mtu 1400
sudo ip link set tap-w1 up
sudo ip tuntap add tap-w2 mode tap
sudo ip link set tap-w2 master k3kbr0
sudo ip link set tap-w2 mtu 1400
sudo ip link set tap-w2 up
- name: Download Base Cloud Image
@@ -226,6 +236,7 @@ jobs:
ethernets:
ens3:
dhcp4: false
mtu: 1400
addresses: [${IP}/24]
routes:
- to: default
@@ -299,16 +310,18 @@ jobs:
done
- name: Join Workers to K3k Control Plane
env:
K3S_WORKER_VERSION: ${{ env.KUBERNETES_VERSION }}+k3s1
run: |
K3S_TOKEN=$(kubectl get secret -n k3k-mycluster k3k-mycluster-token -o jsonpath='{.data.token}' | base64 -d)
echo "Registering Worker 1..."
echo "Registering Worker 1 (k3s ${K3S_WORKER_VERSION})..."
ssh -i ./id_rsa -o StrictHostKeyChecking=no ubuntu@192.168.100.11 \
"curl -sfL https://get.k3s.io | K3S_URL=https://192.168.100.1:30001 K3S_TOKEN=${K3S_TOKEN} sh -"
"curl -sfL https://get.k3s.io | INSTALL_K3S_VERSION=${K3S_WORKER_VERSION} K3S_URL=https://192.168.100.1:30001 K3S_TOKEN=${K3S_TOKEN} sh -"
echo "Registering Worker 2..."
echo "Registering Worker 2 (k3s ${K3S_WORKER_VERSION})..."
ssh -i ./id_rsa -o StrictHostKeyChecking=no ubuntu@192.168.100.12 \
"curl -sfL https://get.k3s.io | K3S_URL=https://192.168.100.1:30001 K3S_TOKEN=${K3S_TOKEN} sh -"
"curl -sfL https://get.k3s.io | INSTALL_K3S_VERSION=${K3S_WORKER_VERSION} K3S_URL=https://192.168.100.1:30001 K3S_TOKEN=${K3S_TOKEN} sh -"
- name: Verify Cluster Nodes
env: