gnschenker / multi-tenant-poc

POC for a multi tenant app using a DB per tenant - Implemented in .NET Core and EF

Multi Tenancy POC

This is a POC showing how one can use Entity Framework with a Postgres DB per tenant. Different tenant identification strategies can be used. The following ones are implemented:

• Using a request header (X-Tenant) to provide the tenant and a database lookup to map the tenant
  DbTenantIdentificationService.cs

• Using a request header (X-Tenant) to provide the tenant and a configuration file lookup to map the tenant
  HeaderTenantIdentificationService.cs

• Using the request host to provide the tenant and a configuration file lookup to map the tenant
  HostTenantIdentificationService.cs

Using multiple DbScopes

To use multiple DbScope objects one must use generic options in the constructor (DbContextOptions<T>).

It is also advised to implement factory objects to generate the DB context objects when using tools such as dotnet ef migrations (see: https://docs.microsoft.com/en-us/ef/core/miscellaneous/cli/dbcontext-creation)

Creating the Code First Migrations

• To create the (first) migration for the tenants context use:

  dotnet ef migrations add InitialCreate --context TenantsDbContext -o Migrations/Tenants

• To create the SQL scripts for the (first) migration for the tenants context use:

  dotnet ef migrations script --context TenantsDbContext -o Migrations/Tenants/scripts/00-initial-create.sql

• To create the (first) migration for the blogs context use:

  dotnet ef migrations add InitialCreate --context BlogsDbContext -o Migrations/Blogs

• To create the SQL scripts for the (first) migration for the tenants context use:

  dotnet ef migrations script --context BlogsDbContext -o Migrations/blogs/scripts/00-initial-create.sql

Creating a DB per Tenant

TODO: how do we want to create (and/or migrate) all tenant databases?