i’m trying to install k3s with cilium on an alpine 3.20 virtual machine (https://dl-cdn.alpinelinux.org/alpine/v3.20/releases/x86_64/alpine-extended-3.20.0-x86_64.iso), following the steps below, but i’m getting the following error:

— error —

spec: failed to generate spec: path “/sys/fs/bpf” is mounted on “/sys” but it is not a shared mount

— install steps —

apk add dbus
dbus-uuidgen > /var/lib/dbus/machine-id
rc-update add dbus

curl -sfL https://get.k3s.io | sh -s - server --cluster-init --token ${SERVER_TOKEN} 
--disable traefik 
--flannel-backend=none 
--disable network-policy 
--disable-kube-proxy 
--disable=servicelb 
--tls-san=${MAIN_SERVER} 
--write-kubeconfig-mode 644 
--write-kubeconfig ${KUBECONFIG}


cilium install 
--set=ipam.operator.clusterPoolIPv4PodCIDRList=10.42.0.0/16 
--set bgpControlPlane.enabled=true 
--set kubeProxyReplacement=true 
--set ingressController.enabled=true 
--set k8sServiceHost=${MAIN_SERVER} 
--set k8sServicePort=6443

— setup bpf on alpine —

Enable CGroup2

vi /etc/rc.conf

Then edit rc_cgroup_mode, defaultly it would be #rc_cgroup_mode=”hybrid”, we should switch to unified to make sure CGroup2 in default.

rc_cgroup_mode="unified"

Then enable cgroups service:

rc-update add cgroups boot

Mount bpf

Edit /etc/init.d/sysfs:

vi /etc/init.d/sysfs

Add the following to the mount_misc section:

# Setup Kernel Support for bpf file system
if [ -d /sys/fs/bpf ] && ! mountinfo -q /sys/fs/bpf; then
    if grep -qs bpf /proc/filesystems; then
        ebegin "Mounting eBPF filesystem"
        mount -n -t bpf -o ${sysfs_opts} bpffs /sys/fs/bpf
        eend $?
    fi
fi