How to know the version of CoreOS in OpenShift 4

Environment

• Red Hat OpenShift Container Platform (RHOCP)
  • 4
• Red Hat CoreOS (RHCOS)
  • 4

Issue

• How to verify what version of Red Hat CoreOS is running on each worker node.

Resolution

1. Check the available nodes:

NAME       STATUS   ROLES                  AGE     VERSION
master-0   Ready    control-plane,master   4h20m   v1.29.10+67d3387
master-1   Ready    control-plane,master   4h20m   v1.29.10+67d3387
master-2   Ready    control-plane,master   4h20m   v1.29.10+67d3387
worker-0   Ready    worker                 3h57m   v1.29.10+67d3387
worker-1   Ready    worker                 3h57m   v1.29.10+67d3387
worker-2   Ready    worker                 3h57m   v1.29.10+67d3387

2. Retrieve the desired information from the node (in this case worker-0):

$ oc debug node/worker-0.shrocp4upi416ovn.lab.upshift.rdu2.redhat.com -- chroot /host bash -c 'cat /etc/redhat-release; grep -E "OPENSHIFT_VERSION=|RHEL_VERSION=|^VERSION=" /etc/os-release; rpm -q kernel' 2>/dev/null

Red Hat Enterprise Linux CoreOS release 4.16
VERSION="416.94.202411201433-0"
OPENSHIFT_VERSION="4.16"
RHEL_VERSION=9.4
kernel-5.14.0-427.44.1.el9_4.x86_64

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