114 lines
4.2 KiB
Plaintext
114 lines
4.2 KiB
Plaintext
---
|
|
layout: docs
|
|
page_title: Storing the Gossip Encryption Key in Vault
|
|
description: >-
|
|
Configuring the Consul Helm chart to use a gossip encryption key stored in Vault.
|
|
---
|
|
|
|
# Storing Gossip Encryption Key in Vault
|
|
|
|
This topic describes how to configure the Consul Helm chart to use TLS certificates issued by Vault in the Consul controller and connect inject webhooks.
|
|
|
|
## Overview
|
|
Complete the steps outlined in the [Data Integration](/docs/k8s/deployment-configurations/vault/data-integration) section to use a gossip encryption key stored in Vault.
|
|
|
|
Complete the following steps once:
|
|
1. Store the secret in Vault.
|
|
1. Create a Vault policy that authorizes the desired level of access to the secret.
|
|
|
|
Repeat the following steps for each datacenter in the cluster:
|
|
1. Create Vault Kubernetes auth roles that link the policy to each Consul on Kubernetes service account that requires access.
|
|
1. Update the Consul on Kubernetes helm chart.
|
|
|
|
## Prerequisites
|
|
Prior to setting up the data integration between Vault and Consul on Kubernetes, you will need to have:
|
|
1. Read and completed the steps in the [Systems Integration](/docs/k8s/deployment-configurations/vault/systems-integration) section of [Vault as a Secrets Backend](/docs/k8s/deployment-configurations/vault).
|
|
2. Read the [Data Integration Overview](/docs/k8s/deployment-configurations/vault/data-integration) section of [Vault as a Secrets Backend](/docs/k8s/deployment-configurations/vault).
|
|
|
|
## Store the Secret in Vault
|
|
First, generate and store the gossip key in Vault. You will only need to perform this action once:
|
|
|
|
```shell-session
|
|
$ vault kv put secret/consul/gossip key="$(consul keygen)"
|
|
```
|
|
## Create Vault policy
|
|
|
|
Next, create a policy that allows read access to this secret.
|
|
|
|
The path to the secret referenced in the `path` resource is the same value that you will configure in the `global.gossipEncryption.secretName` Helm configuration (refer to [Update Consul on Kubernetes Helm chart](#update-consul-on-kubernetes-helm-chart)).
|
|
|
|
<CodeBlockConfig filename="gossip-policy.hcl">
|
|
|
|
```HCL
|
|
path "secret/data/consul/gossip" {
|
|
capabilities = ["read"]
|
|
}
|
|
```
|
|
|
|
</CodeBlockConfig>
|
|
|
|
Apply the Vault policy by issuing the `vault policy write` CLI command:
|
|
|
|
```shell-session
|
|
$ vault policy write gossip-policy gossip-policy.hcl
|
|
```
|
|
|
|
## Create Vault Authorization Roles for Consul
|
|
|
|
Next, we will create Kubernetes auth roles for the Consul server and client:
|
|
|
|
```shell-session
|
|
$ vault write auth/kubernetes/role/consul-server \
|
|
bound_service_account_names=<Consul server service account> \
|
|
bound_service_account_namespaces=<Consul installation namespace> \
|
|
policies=gossip-policy \
|
|
ttl=1h
|
|
```
|
|
|
|
```shell-session
|
|
$ vault write auth/kubernetes/role/consul-client \
|
|
bound_service_account_names=<Consul client service account> \
|
|
bound_service_account_namespaces=<Consul installation namespace> \
|
|
policies=gossip-policy \
|
|
ttl=1h
|
|
```
|
|
|
|
To find out the service account names of the Consul server and client,
|
|
you can run the following `helm template` commands with your Consul on Kubernetes values file:
|
|
|
|
- Generate Consul server service account name
|
|
```shell-session
|
|
$ helm template --release-name ${RELEASE_NAME} -s templates/server-serviceaccount.yaml hashicorp/consul -f values.yaml
|
|
```
|
|
|
|
- Generate Consul client service account name
|
|
```shell-session
|
|
$ helm template --release-name ${RELEASE_NAME} -s templates/client-serviceaccount.yaml hashicorp/consul -f values.yaml
|
|
```
|
|
|
|
## Update Consul on Kubernetes Helm chart
|
|
|
|
Now that we've configured Vault, you can configure the Consul Helm chart to
|
|
use the gossip key in Vault:
|
|
|
|
<CodeBlockConfig filename="values.yaml">
|
|
|
|
```yaml
|
|
global:
|
|
secretsBackend:
|
|
vault:
|
|
enabled: true
|
|
consulServerRole: consul-server
|
|
consulClientRole: consul-client
|
|
gossipEncryption:
|
|
secretName: secret/data/consul/gossip
|
|
secretKey: key
|
|
```
|
|
|
|
</CodeBlockConfig>
|
|
|
|
Note that `global.gossipEncryption.secretName` is the path of the secret in Vault.
|
|
This should be the same path as the one you'd include in your Vault policy.
|
|
`global.gossipEncryption.secretKey` is the key inside the secret data. This should be the same
|
|
as the key we passed when we created the gossip secret in Vault.
|