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Improve upgrade documentation to include content about autopilot configuration settings #9699

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preetapan opened this issue Feb 3, 2021 · 0 comments
Open

Improve upgrade documentation to include content about autopilot configuration settings #9699

preetapan opened this issue Feb 3, 2021 · 0 comments
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theme/reliability type/docs Documentation needs to be created/updated/clarified

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@preetapan
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When using Consul enterprise, the autopilot setting autopilot_disable_upgrade_migration defaults to false. When this setting is false, Consul expects operators to use a blue/green upgrade strategy where if there are n servers, n additional servers are added with the new version, and the autopilot feature will downgrade previous version servers to non-voters while upgrading new version servers to voters.

However, if the operator adds one server at a time to do a manual rolling upgrade, this setting causes leader election to stop due to loss of quorum, preventing the upgrade from proceeding.

We should improve our upgrade docs to call out enterprise specific features and how different upgrade strategies are impacted by autopilot settings.
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