Edit the installation

To add more machines to the existing Kubernetes cluster, see Add a node.

You can remove machines from the existing Kubernetes cluster as follows:

1. Log on the machine that you want to remove.

2. Go to the installation directory, and run the uninstall command:

   cd <foundation_temp_dir>

   ./uninstall.sh

The ITOM Container Deployment Foundation adheres to Kubernetes' hard eviction policy for the existing worker nodes. Once a hard eviction threshold is met, Kubernetes will kill the pod immediately. The eviction can also delete dead pods, dead containers, and unused images when the disk space meets the thresholds. For more details, see the Kubernetes documentation.

To edit the hard eviction threshold for a worker node, do the following:

1. Log on the worker node for which you want to edit the eviction threshold.

2. Access the file /usr/lib/systemd/system/kubelet.service, and edit the parameter values as required. For example, you can edit the following values:

   Examples:
   vim /usr/lib/systemd/system/kubelet.service
--eviction-hard=memory.available<500Mi,nodefs.available<5Gi,imagefs.available<5Gi
--system-reserved=memory=1.5Gi

3. To enable the new thresholds, run the following commands:

   systemctl daemon-reload

   systemctl restart kubelet