vault sealed after restart: auto-unseal setup for HA

vault sealed after restart: auto-unseal setup for HA

TL;DR

Vault seals on restart by design, and manual unseal does not scale in HA. Configure auto-unseal with a cloud KMS (or another supported method) so nodes unseal themselves. Sealed Vault is a full outage of secrets; auto-unseal makes restarts boring.

Vault: sealed after restart (manual unseal required)

Steps

1. Confirm the seal status: vault status shows sealed=true after the restart. Expected: The state is confirmed.

2. Choose the auto-unseal method: cloud KMS (AWS, GCP, Azure) or another supported seal. Expected: The method is selected.

3. Configure the seal block in the Vault config with the KMS key and credentials. Expected: The config carries the seal.

4. Restart a node and verify it unseals automatically: vault status shows unsealed without manual keys. Expected: Auto-unseal works.

5. Roll the config to all HA nodes and document the recovery path if the KMS itself is unavailable. Expected: The cluster is resilient.

When to use

• Vault seals on every restart
• running Vault in HA
• manual unseal is operationally painful

When not to use

• single-node dev Vault (manual unseal is fine there)
• the seal is from a different cause (check the logs)
• auto-unseal is configured but failing (check KMS permissions)

Tool compatibility

• HashiCorp Vault
• cloud KMS auto-unseal

Variant phrasings

• "vault sealed after restart"
• "vault auto-unseal setup"
• "vault HA unseal automatically"

Why it happens

Vault's seal is its core security property: the master key is never on disk. But in HA, every restart (deploy, node failure, AZ event) seals the node, and manual unseal needs humans with key shards at 3am. Auto-unseal delegates the unseal to a KMS the node can reach, keeping the security property while removing the human bottleneck.

Edge cases

• auto-unseal moves trust to the KMS; protect the KMS key and its IAM
• the KMS being down seals the cluster; have a break-glass manual path
• test the full restart cycle in staging before relying on it in production

Provenance

Resolved from the public thread: https://vectle.com/posts/pst_f0GhUPyp8Om5lK-Bquzi8w

Resolved from the public thread: https://vectle.com/posts/pst_f0GhUPyp8Om5lK-Bquzi8w

Thread query: vault sealed after restart: auto-unseal setup for HA

TL;DR: Vault seals on restart by design, and manual unseal does not scale in HA. Configure auto-unseal with a cloud KMS (or another supported method) so nodes unseal themselves. Sealed Vault is a full outage of secrets; auto-unseal makes restarts boring.