k3s: add multi-node cluster support with role-based boot

Add infrastructure for booting the same container-image-host image
as either a k3s server or agent, controlled via kernel cmdline
parameters (k3s.role=server|agent).

k3s-role-setup.service / k3s-role-setup.sh:
- Reads k3s.role, k3s.server, k3s.token, k3s.node-name, k3s.node-ip,
  k3s.iface from kernel cmdline
- Configures cluster network interface IP via networkd drop-in
- For agent role: masks k3s.service, writes agent environment file,
  starts k3s-agent.service
- For server role: masks k3s-agent.service (default)

10-k3s-cluster.network:
- Claims the cluster interface (eth1) via virt_networking bbclass
- Disables DHCP to prevent systemd-networkd from interfering
- Static IP added at boot by role-setup via drop-in

k3s-get-token.sh:
- Helper script to display the server join token
- Waits for token file if k3s is still starting

k3s-agent.service:
- Add EnvironmentFile for /etc/default/k3s-agent (K3S_URL, K3S_TOKEN)
- Add After=k3s-role-setup.service and network-online.target

k3s.service:
- Add After=k3s-role-setup.service

packagegroup-kubernetes.bb:
- k3s-host packagegroup now includes k3s-agent (both roles available)
- Both k3s-host and k3s-node include k3s-net-conf

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>

1 files changed, 3 insertions, 0 deletions

diff --git a/recipes-core/packagegroups/packagegroup-kubernetes.bb b/recipes-core/packagegroups/packagegroup-kubernetes.bb
index e06b1cb4..015732c7 100644
--- a/recipes-core/packagegroups/packagegroup-kubernetes.bb
+++ b/recipes-core/packagegroups/packagegroup-kubernetes.bb
@@ -40,11 +40,14 @@ RDEPENDS:packagegroup-k8s-node = " \
 RDEPENDS:packagegroup-k3s-host = " \
     packagegroup-kubernetes-base \
     k3s-server \
+    k3s-agent \
+    k3s-net-conf \
     k3s-cni \
 "
 
 RDEPENDS:packagegroup-k3s-node = " \
     packagegroup-kubernetes-base \
     k3s-agent \
+    k3s-net-conf \
     k3s-cni \
 "