99 lines
3.0 KiB
Plaintext
99 lines
3.0 KiB
Plaintext
---
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layout: docs
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page_title: Storing Gossip Encryption Key in Vault
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description: >-
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Configuring the Consul Helm chart to use gossip encryption key stored in Vault.
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---
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# Storing Gossip Encryption Key in Vault
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To use a gossip encryption key stored in Vault we need the following:
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1. Generate and store an encryption key in Vault.
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1. Create policies that will allow Consul client and server to access that key.
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1. Create a Kubernetes auth roles that link policies from step 2 to Kubernetes service accounts of the Consul servers and clients.
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## Configuring Vault
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First, generate and store the gossip key in Vault:
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```shell-session
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$ vault kv put secret/consul/gossip key="$(consul keygen)"
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```
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Next, we will need to create a policy that allows read access to this secret:
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<CodeBlockConfig filename="gossip-policy.hcl">
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```HCL
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path "secret/data/consul/gossip" {
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capabilities = ["read"]
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}
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```
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</CodeBlockConfig>
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```shell-session
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$ vault policy write gossip-policy gossip-policy.hcl
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```
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Prior to creating Vault auth roles for the Consul servers and clients, ensure that the Vault Kubernetes auth method is enabled as described in [Vault Kubernetes Auth Method](/docs/k8s/installation/vault#vault-kubernetes-auth-method).
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Next, we will create Kubernetes auth roles for the Consul server and client:
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```shell-session
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$ vault write auth/kubernetes/role/consul-server \
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bound_service_account_names=<Consul server service account> \
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bound_service_account_namespaces=<Consul installation namespace> \
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policies=gossip-policy \
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ttl=1h
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```
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```shell-session
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$ vault write auth/kubernetes/role/consul-client \
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bound_service_account_names=<Consul client service account> \
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bound_service_account_namespaces=<Consul installation namespace> \
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policies=gossip-policy \
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ttl=1h
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```
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To find out the service account names of the Consul server and client,
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you can run the following `helm template` commands with your Consul on Kubernetes values file:
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- Generate Consul server service account name
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```shell-session
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$ helm template --release-name ${RELEASE_NAME} -s templates/server-serviceaccount.yaml hashicorp/consul
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```
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- Generate Consul client service account name
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```shell-session
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$ helm template --release-name ${RELEASE_NAME} -s templates/client-serviceaccount.yaml hashicorp/consul
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```
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## Deploying the Consul Helm chart
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Now that we've configured Vault, you can configure the Consul Helm chart to
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use the gossip key in Vault:
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<CodeBlockConfig filename="values.yaml">
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```yaml
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global:
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secretsBackend:
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vault:
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enabled: true
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consulServerRole: consul-server
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consulClientRole: consul-client
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gossipEncryption:
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secretName: secret/data/consul/gossip
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secretKey: key
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```
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</CodeBlockConfig>
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Note that `global.gossipEncryption.secretName` is the path of the secret in Vault.
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This should be the same path as the one you'd include in your Vault policy.
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`global.gossipEncryption.secretKey` is the key inside the secret data. This should be the same
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as the key we passed when we created the gossip secret in Vault.
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