Change cgroup version from v1 to v2 for kubernetes workload clusters deployed via TCA

Products

• VMware Telco Cloud Automation
• VMware Telco Cloud Platform

Issue/Introduction

• Switch cgroup version from v1 to v2 for K8s workload clusters

Environment

• TCA: 3.1.0, 3.1.1
• TCP: 4.0, 4.0.1

Cause

The default cgroup has set to v1 within the BYOI Templates.

Resolution

Change cgroup via DIP

1. Upgrade cgroup from v1 to v2 in photon 5 by appending the following kernel arguments in the CNF CSAR as part of the DIP requirements:

Key	Value	Description
systemd.unified_cgroup_hierarchy	1	Enable cgroup v2
systemd.legacy_systemd_cgroup_controller	0	Disable cgroup v1

Example:

 

Validate cgroup change

1. Before CNF, instantiating the above Network Function, check cgroup version on the K8S Cluster:
   # stat -fc %T /sys/fs/cgroup/
tmpfs
2. Once the instantiation of the Network Function is successful, verify that the cgroup version is upgraded within the K8S Cluster:
   # stat -fc %T /sys/fs/cgroup/
cgroup2fs