What is the method for installing Kubernetes offline?

There are several methods for installing Kubernetes offline.

1. Install via binary files: Manually download and install Kubernetes binary files on each node, then set up corresponding configuration files and startup scripts on each node to accomplish offline installation.
2. Some tools, such as kubeadm and kubespray, can assist in offline installation of Kubernetes by automatically downloading and installing the Kubernetes binaries and helping to configure the necessary settings and startup scripts.
3. Use offline mirror: download all the necessary Kubernetes image files to your local machine beforehand, and then import these image files onto each node using some tools, along with configuring the corresponding files and starting scripts.

Regardless of the method used, offline installation of Kubernetes requires preparation of all necessary files and images beforehand, and ensuring that each node has access to these files and images.