Highly Available Vault Cluster with Integrated Storage (Raft)

Important Note: This chart is not compatible with Helm 2. Please use Helm 3 with this chart.

Integrated storage (raft) can be enabled using the server.ha.raft.enabled value:

helm install vault hashicorp/vault \
  --set='server.ha.enabled=true' \
  --set='server.ha.raft.enabled=true'

Next, initialize and unseal vault-0 pod:

kubectl exec -ti vault-0 -- vault operator init
kubectl exec -ti vault-0 -- vault operator unseal

Finally, join the remaining pods to the Raft cluster and unseal them. The pods will need to communicate directly so we'll configure the pods to use the internal service provided by the Helm chart:

kubectl exec -ti vault-1 -- vault operator raft join http://vault-0.vault-internal:8200
kubectl exec -ti vault-1 -- vault operator unseal

kubectl exec -ti vault-2 -- vault operator raft join http://vault-0.vault-internal:8200
kubectl exec -ti vault-2 -- vault operator unseal

To verify if the Raft cluster has successfully been initialized, run the following.

First, login using the root token on the vault-0 pod:

kubectl exec -ti vault-0 -- vault login

Next, list all the raft peers:

kubectl exec -ti vault-0 -- vault operator raft list-peers

Node                                    Address                        State       Voter
----                                    -------                        -----       -----
a1799962-8711-7f28-23f0-cea05c8a527d    vault-0.vault-internal:8201    leader      true
e6876c97-aaaa-a92e-b99a-0aafab105745    vault-1.vault-internal:8201    follower    true
4b5d7383-ff31-44df-e008-6a606828823b    vault-2.vault-internal:8201    follower    true

Vault with Integrated Storage (Raft) is now ready to use!