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ISO VM templates

ISO VM templates

Section titled “ISO VM templates”

It is important to set up a template for VMs due to the long process it can take but the value in isolation instead of just linux containers.

  • Update and Upgrade Packages:

  • First, ensure all packages are up-to-date. This step is optional but recommended.

Terminal window
sudo apt update && sudo apt upgrade -y

  • Clean Up APT Cache:

  • Remove downloaded package files to save space.

Terminal window
sudo apt clean

  • Remove Old Kernels (optional):

  • This step is optional and only needed if you’ve upgraded the kernel and have old ones lying around.

Terminal window
sudo apt autoremove --purge

  • Clear Temporary Files and Directories:

  • Clear out temporary files to clean up the system.

Terminal window
sudo rm -rf /tmp/* /var/tmp/*

  • Clear System Logs:

  • Clearing old logs can help protect privacy and reduce template size.

Terminal window
sudo find /var/log -type f -exec truncate -s 0 {} \;

  • Clear Bash History:

  • Clear the command history to remove any traces of commands you’ve run.

Terminal window
history -c && history -w

  • Reset Network Settings (if necessary):

  • If you want the cloned VMs to configure network settings on first boot, reset the network configuration. This process depends on whether your VM uses ifupdown, NetworkManager, or systemd-networkd.

For ifupdown, edit /etc/network/interfaces and remove or comment out all configurations except lo (loopback).

  • Generalize the System (optional for Linux):

  • Unlike Windows, Linux doesn’t require a generalize step like sysprep. However, you might want to remove or anonymize machine-specific data, such as SSH host keys (they will regenerate on first boot).

Terminal window
sudo rm -f /etc/ssh/ssh_host_*

  • Shutdown the VM:

  • Once you’ve completed these steps, shut down the VM.

Terminal window
sudo shutdown now

After the VM is shut down, you can convert it into a template in Proxmox. This template can then be used to deploy new VMs quickly. Remember, each cloned VM will require some initial setup, such as setting hostnames and network configurations.