28 lines
2.4 KiB
Markdown
28 lines
2.4 KiB
Markdown
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# FAST multitenant stages
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The stages in this folder set up separate resource hierarchies inside the same organization that are fully FAST-compliant, and allow each tenant to run and manage their own networking, security, or application-level stages. They are designed to be used where a high degree of autonomy is needed for each tenant, for example individual subsidiaries of a large corporation all sharing the same GCP organization.
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The multitenant stages have the following characteristics:
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- they support one tenant at a time, so one copy of both stages is needed for each tenant
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- they have the organization-level bootstrap and resource management stages as prerequisite
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- they are logically equivalent to the respective organization-level stages but behave slightly differently, as they actively minimize access and changes to organization or shared resources
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Once both tenant-level stages are run, a hierarchy and a set of resources is available for the new tenant, including a separate automation project, service accounts for subsequent stages, etc.
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The tenant-level stages require that organization-level stage 0 (bootstrap) and 1 (resource management) have been applied. Their position and role in the FAST stage flow is shown in the following diagram:
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<p align="center">
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<img src="stages.svg" alt="Stages diagram">
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</p>
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## Tenant bootstrap (0)
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This stage creates the top-level root folder and tag for the tenant, and the tenant-level automation project and automation service accounts. It also sets up billing and organization-level roles for the tenant administrators group and the automation service accounts. As in the organizational-level stages, it can optionally set up CI/CD for itself and the tenant resource management stage.
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This stage is run with the organization-level resource management service account as it leverages its permissions, and is the bridge between the organization-level stages and the tenant stages which are effectively decoupled from the rest of the organization.
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## Tenant resource management (1)
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This stage populates the resource hierarchy rooted in the top-level tenant folder, assigns roles to the tenant automation service accounts, and optionally sets up CI/CD for the following stages. It is functionally equivalent to the organization-level resource management stage, but runs with a tenant-specific service account and has no control over resources outside of the tenant context.
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