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Brian Shumate ac69680d7b Docs: mlock() notes, fixes #3605 (#3614)
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guides Upgrading Vault - Guides guides-upgrading These are general upgrade instructions for Vault for both non-HA and HA setups. Please ensure that you also read the version-specific upgrade notes.

Upgrading Vault

These are general upgrade instructions for Vault for both non-HA and HA setups. Please ensure that you also read any version-specific upgrade notes which can be found in the sidebar.

Always back up your data before upgrading! Vault does not make backwards-compatibility guarantees for its data store. If you need to roll back to a previous version of Vault, it is always a good idea to roll back your data store as well.

Non-HA Installations

Upgrading non-HA installations of Vault is as simple as replacing the Vault binary with the new version and restarting Vault. Any upgrade tasks that can be performed for you will be taken care of when Vault is unsealed.

Always use SIGINT or SIGTERM to properly shut down Vault.

Be sure to also read and follow any instructions in the version-specific upgrade notes.

HA Installations

This is our recommended upgrade procedure, and the procedure we use internally at HashiCorp. However, you should consider how to apply these steps to your particular setup since HA setups can differ on whether a load balancer is in use, what addresses clients are being given to connect to Vault (standby + leader, leader-only, or discovered via service discovery), etc.

Whatever method you use, you should ensure that you never fail over from a newer version of Vault to an older version. Our suggested procedure is designed to prevent this.

Please note that Vault does not support true zero-downtime upgrades, but with proper upgrade procedure the downtime should be very short (a few hundred milliseconds to a second depending on how the speed of access to the storage backend).

Perform these steps on each standby:

  1. Properly shut down Vault on the standby node via SIGINT or SIGTERM
  2. Replace the Vault binary with the new version
  3. Start the standby node
  4. Unseal the standby node

At this point all standby nodes will be upgraded and ready to take over. The upgrade will not be complete until one of the upgraded standby nodes takes over active duty. To do this:

  1. Properly shut down the remaining (active) node. Note: it is very important that you shut the node down properly. This causes the HA lock to be released, allowing a standby node to take over with a very short delay. If you kill Vault without letting it release the lock, a standby node will not be able to take over until the lock's timeout period has expired. This is backend-specific but could be ten seconds or more.
  2. Replace the Vault binary with the new version; ensure that mlock() capability is added to the new binary with setcap
  3. Start the node
  4. Unseal the node (it will now be a standby)

Internal upgrade tasks will happen after one of the upgraded standby nodes takes over active duty.

Be sure to also read and follow any instructions in the version-specific upgrade notes.