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doc: describe Hashicorp Vault with a ServiceAccount per Tenant

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In addition to the single ServiceAccount KMS support for Hashicorp
Vault, Ceph-CSI can now use a ServiceAccount per Tenant as well. This
adds the user-documentation with references to the example deployment
files.

Closes: #2222
Signed-off-by: Niels de Vos <ndevos@redhat.com>
This commit is contained in:
Niels de Vos 2021-07-15 09:42:44 +02:00 committed by mergify[bot]
parent 841a53bc3d
commit c4372b8567
1 changed files with 30 additions and 1 deletions
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docs/deploy-rbd.md
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@ -299,7 +299,7 @@ it in a Kubernetes Secret (by default) called `ceph-csi-kms-token`, where the
Vault Token is stored in the `token` key as shown in [the
example](../examples/kms/vault/tenant-token.yaml).
#### Configuring HashiCorp Vault with Kubernetes ServiceAccount
#### Configuring HashiCorp Vault with a single Kubernetes ServiceAccount
Using Vault as KMS you need to configure Kubernetes authentication method as
described in [official
@ -317,6 +317,35 @@ Configure a role(s) for service accounts used for ceph-csi:
* nodeplugin service account (`rbd-csi-nodeplugin`) requires **create** and
**read** permissions to save new keys and retrieve existing
#### Configuring Hashicorp Vault with a ServiceAccount per Tenant
For deployments where a single ServiceAccount for accessing Hashicorp Vault is
not suitable, it is possible to configure a ServiceAccount per Tenant to access
the KMS. In order to configure this, each Tenant will need to have its own
ServiceAccount in the Kubernetes Namespace where the volumes are created. The
ServiceAccount is expected to be called `ceph-csi-vault-sa` by default. This
can be changed by setting the `tenantSAName` option to a different value. An
example of the global configuration that can be done in the Kubernetes
Namespace where Ceph-CSI is deployed can be found in
[`kms-config.yaml`](../examples/kms/vault/kms-config.yaml) where the
`encryptionKMSType` is set to `vaulttenantsa`.
Most notably, the Vault Tokens KMS configuration can be used, without the Token
configuration, but with added `tenantSAName` and `vaultRole` options.
Tenants do have the ability to reconfigure parts of the connection details to
the Vault service. It will often be required to set the backend path to a
location where the Tenant can manage the secrets. These changes can be done by
placing a ConfigMap called `ceph-csi-kms-config` in the Tenants Namespace, an
[example](../examples/kms/vault/tenant-sa.yaml) is available.
As each ServiceAccount needs to be added to the Vault configuration, the
administrator of the service will need to apply the permissions by creating a
Vault Policy that allows a ServiceAccount to access a key-value store in the
KMS. In the Ceph-CSI automated testing, there is [a Kubernetes Job that sets
this up](../examples/kms/vault/tenant-token.yaml) for a single Tenant that uses
the Kubernetes Namespace `tenant`.
#### Configuring Amazon KMS
Amazon KMS can be used to encrypt and decrypt the passphrases that are used for