For HA, state how to restore a replica; in DR note instructions are only for lost clusters

[leenamba]

Problem description

A DDC customer Finnish Rail thought backup and restore applied to single replicas and not for the entire cluster. This caused them to loose a day of work and opened up several support tickets.

Project version(s) affected

DTR 2.0 and 2.1

Suggestions for a fix

State clearly in the HA section how to restore a replica with join command.
State clearly in the DR section that this is only if you've lost the entire cluster.

[londoncalling]

About the topics

This set of issues is related to setting up HA with DTR, starting with the 2.0 docs: https://docs.docker.com/datacenter/dtr/2.0/high-availability/

The current version of this topic is: https://docs.docker.com/datacenter/dtr/2.2/guides/admin/configure/set-up-high-availability/

Related issues and PRs

Open

#1750

Closed but list several other issues, some still open

#1785, #1724, #1792

[joaofnfernandes]

This will be addressed in the next release of DTR. We've done a ton of content changes for the next version, but unfortunately they are not that easy to backport, so you won't get those goodies for now.

[docker-robott]

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If you have found a problem that seems similar to this, please open a new issue.

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