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Initialize OS (init_os.yaml)

init_os.yaml is used to initialize the operating system environment of cluster nodes, including system configuration, package installation, and certificate preparation. It is suitable for node preparation before cluster installation.

Execution Flow

  1. Global Initialization

    • Execute the native/root role on all nodes.

  2. Load Default Variables

    • Load the defaults role on all nodes.

  3. Certificate and Resource Preparation

    • Execute on localhost:
      • certs/init: Initialize and generate certificates required by the cluster.
      • download: Download software packages such as Kubernetes and container runtime.

  4. Node System Initialization

    • Execute the native role for nodes in the etcd, k8s_cluster, image_registry, and nfs groups to install necessary system packages and complete basic environment configuration.

Notes

  • This playbook itself does not actually deploy Kubernetes or CRI; its main purpose is to complete OS-level node preparation.
  • It can be used to batch-initialize node environments before formally executing create_cluster.yaml.