docs: Clarification of Vault Consul K8s requirements for Auth Method (#11929)
* docs: Clarification of Vault Consul K8s requirements * link back to requirements * Update gossip.mdx * Update index.mdx * add details for K8s auth method requirement * Update gossip.mdx * Update server-tls.mdx * Update connect-ca.mdx * Update gossip.mdx * Update server-tls.mdx * Update website/content/docs/k8s/installation/vault/gossip.mdx Co-authored-by: mrspanishviking <kcardenas@hashicorp.com> * Update website/content/docs/k8s/installation/vault/index.mdx Co-authored-by: mrspanishviking <kcardenas@hashicorp.com> * Update website/content/docs/k8s/installation/vault/index.mdx Co-authored-by: mrspanishviking <kcardenas@hashicorp.com> * Update website/content/docs/k8s/installation/vault/index.mdx Co-authored-by: mrspanishviking <kcardenas@hashicorp.com> * Update website/content/docs/k8s/installation/vault/server-tls.mdx Co-authored-by: mrspanishviking <kcardenas@hashicorp.com> * Update website/content/docs/k8s/installation/vault/index.mdx Co-authored-by: mrspanishviking <kcardenas@hashicorp.com> * Update website/content/docs/k8s/installation/vault/index.mdx Co-authored-by: mrspanishviking <kcardenas@hashicorp.com> * Update index.mdx * Update index.mdx Co-authored-by: mrspanishviking <kcardenas@hashicorp.com>
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David Yu
GitHub
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@ -11,6 +11,8 @@ description: >-
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Consul allows using Kubernetes auth methods to configure Connect CA.
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This allows for automatic token rotation once the renewal is no longer possible.
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In order to create Vault auth roles for the Consul servers for this feature, 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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To configure [Vault as the provider](/docs/connect/ca/vault) for the Consul service certificates,
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you will first need to decide on the type of policy that is suitable for you.
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To see the permissions that Consul would need in Vault, please see [Vault ACL policies](/docs/connect/ca/vault#vault-acl-policies)
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@ -34,11 +34,7 @@ path "secret/data/consul/gossip" {
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vault policy write gossip-policy gossip-policy.hcl
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```
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Prior to creating auth roles for the Consul server and client, ensure that the Vault Kubernetes auth method is enabled:
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```shell-session
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vault auth enable kubernetes
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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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@ -25,12 +25,47 @@ At a high level, there are two points of integration with Vault:
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1. `global.tls.enableAutoencrypt=true` is required if TLS is enabled for the Consul installation when using the Vault secrets backend.
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1. The Vault installation must have been initialized, unsealed and the KV2 and PKI secrets engines enabled and the Kubernetes Auth Method enabled.
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### Vault Helm Config
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A minimal valid installation of Vault must include the Agent Injector:
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```yaml
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injector:
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enabled: "true"
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```
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### Vault Kubernetes Auth Method
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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:
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```shell-session
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$ vault auth enable kubernetes
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```
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After enabling the Kubernetes auth method, in Vault, ensure that you have configured the Kubernetes Auth method properly as described in [Kubernetes Auth Method Configuration](https://www.vaultproject.io/docs/auth/kubernetes#configuration). The command should look simliar to the following with a custom `kubernetes_host` config provided from the information provided via `kubectl cluster-info`.
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```shell-session
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$ vault write auth/kubernetes/config \
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token_reviewer_jwt="$(cat /var/run/secrets/kubernetes.io/serviceaccount/token)" \
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kubernetes_host="https://$KUBERNETES_PORT_443_TCP_ADDR:443" \
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kubernetes_ca_cert=@/var/run/secrets/kubernetes.io/serviceaccount/ca.crt
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```
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### Vault KV Secrets Engine - Version 2
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In order to utlize Vault as a secrets backend, we must enable thne [Vault KV secrets engine - Version 2](https://www.vaultproject.io/docs/secrets/kv/kv-v2).
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```shell-session
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$ vault secrets enable -path=consul kv-v2
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```
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### Vault PKI Engine
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The Vault PKI Engine must be enabled in order to leverage Vault for issuiing Consul Server TLS certificates. More details for configuring the PKI Engine is found in [Bootstrapping the PKI Engine](https://www.consul.io/docs/k8s/installation/vault/server-tls#bootstrapping-the-pki-engine) under the Server TLS section.
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```shell-session
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$ vault secrets enable pki
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```
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## Known Limitations
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- TLS
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@ -100,11 +100,7 @@ export DATACENTER=dc1
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echo allowed_domains=\"$DATACENTER.consul, $NAME-server, $NAME-server.$NAMESPACE, $NAME-server.$NAMESPACE.svc\"
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```
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Prior to creating the Kubernetes auth roles required for Consul to securely access Vault, ensure that the Vault Kubernetes Auth method is enabled:
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```shell-session
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vault auth enable kubernetes
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```
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Prior to creating Vault auth roles for the Consul server and the Consul components, 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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Finally, two Kubernetes auth roles need to be created, one for the Consul servers and one for the Consul components:
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