HashiCorp Vault is an identity-based secret and encryption management system. Vault validates and authorizes a system's clients (users, machines, apps) before providing them access to secrets or stored sensitive data.
Vault integration in Multi Tenant Operator
MTO manages tenant authentication via Vault. MTO automatically creates policies and roles that allow the tenant namespace service accounts to read secrets at tenant's path in Vault. The name of the role is the same as namespace name.
The pod is authenticated to Vault using the Kubernetes auth method. In Vault, roles are associated with Kubernetes service accounts, which permits the service account to read Secrets at a particular path in Vault.
Fig 1. Shows how MTO manages authentication with Vault