Sysbox 0.6.7 installation fails on RKE2 v1.32 ad later Kubernetes cluster due to incompatibility in get_runtime_kubelet_rke2() function of sysbox-pkgr/k8s/scripts /kubelet-config-helper.sh #974
Description
The function get_runtime_kubelet_rke2() in sysbox-pkgr/k8s/scripts /kubelet-config-helper.sh returns an empty string for RKE2 v1.32.9+rke2r1 instead the current runtime of kubelet:
runtime=$(ps -e -o command | egrep kubelet | egrep -o "container-runtime-endpoint=\S*" | cut -d '=' -f2)
The following function is bailing out due to $runtime being set to "unix:///var/run/dockershim.sock" durig sysbox install:
function do_config_kubelet_rke2() {
echo "Detected RKE2's host-based kubelet deployment on host."
# Obtain current runtime.
get_runtime_kubelet_rke2
if [[ ${runtime} =~ "crio" ]]; then
echo "Kubelet is already using CRI-O; no action will be taken."
return
fi
# No runtime other than containerd, and obviously crio, is expected in an
# rke2 deployment.
if [[ ! ${runtime} =~ "containerd" ]]; then
echo "Unsupported runtime for RKE2 scenario: $runtime"
return
fi
In RKE2 v1.32 the config for the kubelet runtime is located in file /var/lib/rancher/rke2/agent/etc/kubelet.conf.d/00-rke2-defaults.conf in line
containerRuntimeEndpoint: unix:///run/k3s/containerd/containerd.sock
or
containerRuntimeEndpoint: unix:///var/run/crio/crio.sock
The proposed fix for the get_runtime_kubelet_rke2() function is:
function get_runtime_kubelet_rke2() {
set +e
# Try RKE2 v1.32+ config file first
local rke2_config="/var/lib/rancher/rke2/agent/etc/kubelet.conf.d/00-rke2-defaults.conf"
if [[ -f "$rke2_config" ]]; then
runtime=$(grep "^containerRuntimeEndpoint:" "$rke2_config" | awk '{print $2}')
fi
# Fallback to legacy kubelet command line parameter for older versions
if [[ -z "$runtime" ]]; then
runtime=$(ps -e -o command | grep kubelet | grep -o "container-runtime-endpoint=\S*" | cut -d '=' -f2)
fi
# If runtime is still unknown, assume it's Docker
if [[ -z "$runtime" ]]; then
runtime="unix:///var/run/dockershim.sock"
fi
set -e
}