101 lines
3.7 KiB
Plaintext
101 lines
3.7 KiB
Plaintext
---
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layout: docs
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page_title: Storing the ACL Replication Token in Vault
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description: >-
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Configuring the Consul Helm chart to use an ACL replication token stored in Vault.
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---
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# Storing the ACL Replication Token in Vault
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This topic describes how to configure the Consul Helm chart to use an ACL replication token 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/installation/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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Prior to setting up the data integration between Vault and Consul on Kubernetes, you will need to have:
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1. Read and completed the steps in the [Systems Integration](/docs/k8s/installation/vault/systems-integration) section of [Vault as a Secrets Backend](/docs/k8s/installation/vault).
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2. Read the [Data Integration Overview](/docs/k8s/installation/vault/data-integration) section of [Vault as a Secrets Backend](/docs/k8s/installation/vault).
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## Store the Secret in Vault
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First, generate and store the ACL replication token in Vault. You will only need to perform this action once:
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```shell-session
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$ vault kv put secret/consul/replication-token token="$(uuidgen | tr '[:upper:]' '[:lower:]')"
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```
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## Create Vault policy
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Next, you will need to create a policy that allows read access to this secret.
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The path to the secret referenced in the `path` resource is the same value that you will configure in the `global.acls.replicationToken.secretName` Helm configuration (refer to [Update Consul on Kubernetes Helm chart](#update-consul-on-kubernetes-helm-chart)).
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<CodeBlockConfig filename="replication-token-policy.hcl">
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```HCL
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path "secret/data/consul/replication-token" {
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capabilities = ["read"]
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}
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```
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</CodeBlockConfig>
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Apply the Vault policy by issuing the `vault policy write` CLI command:
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```shell-session
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$ vault policy write replication-token-policy replication-token-policy.hcl
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```
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## Create Vault Authorization Roles for Consul
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Next, you will create Kubernetes auth roles for the Consul `server-acl-init` job:
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```shell-session
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$ vault write auth/kubernetes/role/consul-server-acl-init \
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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=replication-token-policy \
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ttl=1h
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```
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To find out the service account name of the Consul server,
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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-acl-init-serviceaccount.yaml hashicorp/consul
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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 ACL replication token 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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manageSystemACLsRole: consul-server-acl-init
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acls:
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replicationToken:
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secretName: secret/data/consul/replication-token
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secretKey: token
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```
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</CodeBlockConfig>
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Note that `global.acls.replicationToken.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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`global.acls.replicationToken.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 ACL replication token secret in Vault.
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