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Update "Disaster recovery for WAN-federated datacenters" https://hashicorp.atlassian.net/browse/CE-921

This started as a simple update of the content of a single page but, it became a full restructure of the whole manage/disaster-recovery content trying to rationalize the content and remove duplicated steps or concepts.

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https://consul-git-CE-921-hashicorp.vercel.app/consul/docs/manage/disaster-recovery

Conflicts

This content supersedes the one in #22756 that, in my opinion should be closed.

@danielehc danielehc self-assigned this Sep 25, 2025
@danielehc danielehc requested a review from a team as a code owner September 25, 2025 15:20
@danielehc danielehc added the type/docs Documentation needs to be created/updated/clarified label Sep 25, 2025
@danielehc danielehc requested review from a team as code owners September 25, 2025 15:20
@danielehc danielehc added pr/no-changelog PR does not need a corresponding .changelog entry pr/no-backport labels Sep 25, 2025
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@boruszak boruszak left a comment

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Great job!

I'll need to give this a second review before approving, but please implement these suggestions in the meantime!


## Restore and validate federation

If you have a federated environment, after the primary datacenter restore it is possible that the IP addresses of the Consul server agents changed.
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If you have a federated environment, after the primary datacenter restore it is possible that the IP addresses of the Consul server agents changed.
If you have a federated environment, it is possible that the IP addresses of the Consul server agents changed when the primary datacenter was restored.


If you have a federated environment, after the primary datacenter restore it is possible that the IP addresses of the Consul server agents changed.

Depending on the configuration of your secondary datacenters' server agents, you might need to re-establish federation by updating the server configuration.
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Suggested change
Depending on the configuration of your secondary datacenters' server agents, you might need to re-establish federation by updating the server configuration.
Depending on how you configured the server agents in your secondary datacenter, you may need to re-establish federation by updating the secondary datacenter configurations as well.


Depending on the configuration of your secondary datacenters' server agents, you might need to re-establish federation by updating the server configuration.

Refer to [Loss of federation due to primary datacenter restore.](/consul/docs/manage/disaster-recovery/restore-federated#loss-of-federation-due-to-primary-datacenter-restore) for more information on this.
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Refer to [Loss of federation due to primary datacenter restore.](/consul/docs/manage/disaster-recovery/restore-federated#loss-of-federation-due-to-primary-datacenter-restore) for more information on this.
For more information, refer to [Loss of federation due to primary datacenter restore](/consul/docs/manage/disaster-recovery/restore-federated#loss-of-federation-due-to-primary-datacenter-restore).

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