IOTstack

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The docker update process can be performed with the containers active. The docker-compose up process automatically replaces any old container, even if it is still active. This means that there is nearly zero downtime.

So instead of shutting contains down before pulling and building updates (a lengthy process), the current containers can continue performing tasks, only being replaced when any updates have finished being processed.

The docker-compose build line could also be integrated into the up process via a flag: docker-compose up -d --build, however, that may obscure the flow of things hence I didn't propose it.

I noticed this yesterday also, took docker down while it was running, was unexpected