Boot from attached volume

Is there any easy way to boot a droplet from an existing volume instead of a boot image?

I’d like to be able to spin up a machine and tear it down again - and maintain all the installed packages without having to re-install from apt each time.

I don’t necessarily want a custom image for this, as I want the whole disk context to be persistent (while the actual droplet can be destroyed)

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@kieranbingham wrote
Doesn’t using snapshots mean that I would then have to take another snapshot after having done any ‘work’ on the image?

Yes, it does. You would have to take a snapshot each time before destroying your droplet, otherwise you loose your recent changes. You could simplify ‘taking a snapshot/destroying a droplet’ process with a script based on DO API.

But, have you considered chrooting ? You could install an OS on an attached block storage volume using a tool like debootstrap, and then, chroot to this environment from a droplet’s OS. In that case, all the changes will remain on the attached volume.

The solution mentioned by @Lalitha has got (at least) one advantage over chrooting. 
You can move a snapshot to another region and spin up a new droplet there. You cannot 
do that with a volume.

Hello @kieranbingham ,

You can take a Snapshot of the Droplet. Creating a snapshot saves everything from the Droplet or volume’s disk to a disk image saved in your DigitalOcean account. Snapshots persist on your account even after the Droplet is destroyed. You will be able to create a new Droplet from the Snapshot anytime. Please refer to the following articles for more details

Hope this helps!

Cheers, Lalitha