Merging multiple containers into one

Installation
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When I started my Discourse site a few years ago, I was overly ambitious and split web, data, and redis into three containers on three DigitalOcean VPSes. They’re using link to communicate on a private network and SSL is in place. It’s a standard multi-container setup, per the instructions + forum posts.

I’d like to merge these now into a single standalone container while retaining all data. Is this possible?

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I would imagine the easiest solution to be to put the site in read-only mode. Back it up. Create a new droplet, install Discourse, then restore the backup.

Then dispose of the initial three droplets.

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