Proxmox lxc add add linux.kernel_modules

I'm not sure what guide you are following but assuming that you have the required kernel modules on the host, this would do it:

lxc config set my-container linux.kernel_modules overlay

You can follow this guide from K3s too. Basically:

lxc config edit k3s-lxc

and

config:  linux.kernel_modules: ip_tables,ip6_tables,netlink_diag,nf_nat,overlay  raw.lxc: lxc.mount.auto=proc:rw sys:rw  security.privileged: "true"  security.nesting: "true"

✌️

To allow load with modprobe any modules inside privileged proxmox lxc container, you need add this options to container config:

lxc.apparmor.profile: unconfinedlxc.cgroup.devices.allow: alxc.cap.drop:lxc.mount.auto: proc:rw sys:rwlxc.mount.entry: /lib/modules lib/modules none bind 0 0

before that, you must first create the /lib/modules folder inside the container

For the fix ERROR: ../libkmod/libkmod.c:586 kmod_search_moddep() could not open moddep file run from the host:

pct set $VMID --mp0 /usr/lib/modules/$(uname -r),mp=/lib/modules/$(uname -r),ro=1,backup=0

For the fix [ERROR SystemVerification]: failed to parse kernel config run from the host:

pct push $VMID /boot/config-$(uname -r) /boot/config-$(uname -r)

Where $VMID is your container id.