104 lines
3.9 KiB
Plaintext
104 lines
3.9 KiB
Plaintext
---
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layout: docs
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page_title: Storing the Snapshot Agent Config in Vault
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description: >-
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Configuring the Consul Helm chart to use a snapshot agent config stored in Vault.
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---
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# Storing the Snapshot Agent Config in Vault
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This topic describes how to configure the Consul Helm chart to use a snapshot agent config stored in Vault.
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## Overview
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To use an ACL replication token stored in Vault, follow the steps outlined in the [Data Integration](/docs/k8s/deployment-configurations/vault/data-integration) section.
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Complete the following steps once:
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1. Store the secret in Vault.
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1. Create a Vault policy that authorizes the desired level of access to the secret.
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Repeat the following steps for each datacenter in the cluster:
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1. Create Vault Kubernetes auth roles that link the policy to each Consul on Kubernetes service account that requires access.
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1. Update the Consul on Kubernetes helm chart.
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## Prerequisites
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Before you set up data integration between Vault and Consul on Kubernetes, complete the following prerequisites:
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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).
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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).
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## Store the Secret in Vault
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First, store the snapshot agent config in Vault:
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```shell-session
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$ vault kv put secret/consul/snapshot-agent-config key="<snapshot agent JSON config>"
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```
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## Create Vault policy
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Next, you will need to create a policy that allows read access to this secret.
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The path to the secret referenced in the `path` resource is the same values that you will configure in the `client.snapshotAgent.configSecret.secretName` Helm configuration (refer to [Update Consul on Kubernetes Helm chart](#update-consul-on-kubernetes-helm-chart)).
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<CodeBlockConfig filename="snapshot-agent-config-policy.hcl">
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```HCL
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path "secret/data/consul/snapshot-agent-config" {
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capabilities = ["read"]
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}
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```
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</CodeBlockConfig>
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Apply the Vault policy by issuing the `vault policy write` CLI command:
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```shell-session
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$ vault policy write snapshot-agent-config-policy snapshot-agent-config-policy.hcl
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```
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## Create Vault Authorization Roles for Consul
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Next, add this policy to your Consul server Kubernetes auth role:
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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=snapshot-agent-config-policy \
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ttl=1h
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```
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Note that if you have other policies associated
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with the Consul server service account that are not in the example, you need to include those as well.
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To find out the service account name of the Consul snapshot agent,
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you can run the following `helm template` command with your Consul on Kubernetes values file:
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```shell-session
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$ helm template --release-name ${RELEASE_NAME} -s templates/server-serviceaccount.yaml hashicorp/consul -f values.yaml
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```
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## Update Consul on Kubernetes Helm chart
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Now that you have configured Vault, you can configure the Consul Helm chart to
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use the snapshot agent configuration 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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client:
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snapshotAgent:
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configSecret:
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secretName: secret/data/consul/snapshot-agent-config
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secretKey: key
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```
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</CodeBlockConfig>
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Note that `client.snapshotAgent.configSecret.secretName` is the path of the secret in Vault.
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This should be the same path as the one you included in your Vault policy.
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`client.snapshotAgent.configSecret.secretKey` is the key inside the secret data. This should be the same
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as the key you passed when creating the snapshot agent config secret in Vault.
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