Save installed apt packages and automatically reinstall them after recovery

[stefan-nu]

If a proxmox node fails it would be nice to automatically reinstall all apt packages that were originally installed. The backup script could do this.

An easy way is described here https://askubuntu.com/questions/1092567/how-to-get-package-list-from-one-pc-and-install-that-on-another-pc https://askubuntu.com/questions/17823/how-to-list-all-installed-packages

Save all currently installed packages and repository keys with

sudo dpkg --get-selections > installed-packages
sudo apt-key exportall > repo-keys

In the recovery script install the packages with

sudo apt-get install dselect
sudo apt-key add repo-keys
sudo dpkg --set-selections < installed-packages
sudo apt-get dselect-upgrade -y

Maybe automatic installation is no good idea, as some packages might be outdated. But at least saving the list of previously installed packages would help to reconstruct the node manually.

[DerDanilo]

This can be quiet dangerous. My initial intension for this backup script was to create a backup of all pve related config. In case of a total system crash, installing a new node, importing the important config is enough. Most of the time it anyways something that has to be verified manually.

I suggest that you add 1 or 2 scripts to handle the package backup and restore process as it seems logical in some cases.

Thanks