Rocky 9.1: Unable to load kernel module "ip_tables" automatically

[jbemmel]

WARN[0036] Unable to load kernel module "ip_tables" automatically "load ip_tables failed: exec format error"

Manually:

modprobe ip_tables

Has no issues

[gdluca]

same for ip6_tables.

[mrmrcoleman]

I'm also seeing this on Ubuntu 24.04 (LTS) x64

WARN[0000] Unable to load kernel module "ip6_tables" automatically "load ip6_tables failed: exec format error"

[mrmrcoleman]

Tested the same OS version on Equinix Metal and it works fine, so this problem is limited to Digital Ocean for me

[hellt]

These warnings won't prevent you from enjoying clab.

[hyposcaler-bot]

I have a recreate locally on my machine, I think its mostly cosmetic, at worst has an easy work around (manually load the module) but errors scare newbies and create nagging questions for them, and this gave me a good excuse to explore kmod :D

containerlab uses kmod to load the kernel modules.

By default, kmod doesn't deal gracefully with compressed kernel modules. You need to pass a custom InitFunc to kmod.New() breadcrumb trail starts here

The modprobe.go demo for kmod has a working example of a customer InitFunc that deals with compressed modules.

Can likely just follow that working example and add a similar helper function to utils/kernel_module.go

I'll put together a PR for this later today