How to Reset SSH Host Keys When Deploying Linux Templates in Proxmox

Learn how to reset SSH host keys when deploying Linux templates in Proxmox in this comprehensive 21-minute video tutorial. Discover the importance of unique host keys for server security and follow step-by-step instructions for creating a new set of SSH host keys for each instance. Explore topics such as creating a VM in Proxmox, installing Ubuntu Server, resetting the machine ID, and demonstrating both incorrect and correct approaches. Gain insights into locating and understanding host key files, creating templates with unique host keys, and implementing necessary code changes. Master file permission adjustments, systemd management, and the process of regenerating SSH host keys. Finally, learn how to create templates in Proxmox, clone VMs, and verify the new server keys to ensure proper implementation of this crucial security measure.

Introduction
Creating a VM in Proxmox
Installing Ubuntu Server
Resetting the Machine ID
Demonstrating the Wrong Way to go About This
Connecting to our VMs
Locating the Host Keys
What’s in a Host Key File?
Demonstrating the Right Way to go About This
Connecting to Our New VMs
Resetting the Machine ID
Creating a Template with Unique Host Keys
What’s In This Code?
Change File Permissions
Move the File
Restart systemd
Enable regenerate_ssh_host_keys.service
Checking the Key Before Regeneration
Reboot the System
Creating a Template in Proxmox
Clone the VM
Check the New Servers Keys
Conclusion