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docs: add upgrade best practices guide (#21656)

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2026-02-06 16:08:59 +00:00
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docs/admin/networking/high-availability.md
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@@ -29,6 +29,12 @@ user <-> Coder connections.
Coder automatically enters HA mode when multiple instances simultaneously
connect to the same Postgres endpoint.
> [!NOTE]
> When upgrading HA deployments, database migrations may require special
> handling to avoid lock contention. See
> [Upgrading Best Practices](../../install/upgrade-best-practices.md) for
> recommended procedures.
HA brings one configuration variable to set in each Coderd node:
`CODER_DERP_SERVER_RELAY_URL`. The HA nodes use these URLs to communicate with
each other. Inter-node communication is only required while using the embedded