add ipvs kernel modules for kube-vip

[ahgraber]

if kube-vip cannot find ipvs kernel modules, it will crash-loop with errors (see kube-vip/kube-vip#506)

level=error msg="ensure IPVS kernel modules are loaded"
level=fatal msg="Error starting IPVS [netlink receive: no such file or directory]"

This PR loads ip_vs and ip_vs_rr and enables them at boot.

Signed-off-by: ahgraber ahgraber@ninerealmlabs.com

[onedr0p]

thanks!

[VoliKoN]

When using the ubuntu-22.04-minimal-cloudimg-amd64.img image, the kernel installed is linux-kvm which doesn't include the ip_vs and ip_vs_rr kernel modules. So this task fails with an error:

TASK [System Configuration (2) | Enable kernel modules now] *********************************************************************************************************************************
changed: [c1-node1] => (item=br_netfilter)
failed: [c1-node1] (item=ip_vs) => {"ansible_loop_var": "item", "changed": false, "item": "ip_vs", "msg": "modprobe: FATAL: Module ip_vs not found in directory /lib/modules/5.15.0-1029-kvm\n", "name": "ip_vs", "params": "", "rc": 1, "state": "present", "stderr": "modprobe: FATAL: Module ip_vs not found in directory /lib/modules/5.15.0-1029-kvm\n", "stderr_lines": ["modprobe: FATAL: Module ip_vs not found in directory /lib/modules/5.15.0-1029-kvm"], "stdout": "", "stdout_lines": []}
failed: [c1-node1] (item=ip_vs_rr) => {"ansible_loop_var": "item", "changed": false, "item": "ip_vs_rr", "msg": "modprobe: FATAL: Module ip_vs_rr not found in directory /lib/modules/5.15.0-1029-kvm\n", "name": "ip_vs_rr", "params": "", "rc": 1, "state": "present", "stderr": "modprobe: FATAL: Module ip_vs_rr not found in directory /lib/modules/5.15.0-1029-kvm\n", "stderr_lines": ["modprobe: FATAL: Module ip_vs_rr not found in directory /lib/modules/5.15.0-1029-kvm"], "stdout": "", "stdout_lines": []}

I fixed this by switching to generic kernel image, but maybe this should be documented somewhere.

[onedr0p]

Thanks for reporting but the link to download Ubuntu on the README takes you to the full server ISO (not cloud or minimal) to download.