Certification. Ocelot is an API Gateway that also runs on ASP.NET Core. As introduced previously, a flexible way to implement requests aggregation is with custom services, by code. Those "configuration.json" files are provided by mounting (originally with the deploy.ps1 script) a volume created based on a Kubernetes config map named âocelot'. Well just like the title says I want to show a complete microservice-based architecture using the lightweight IdentityServer4 for authentication and Ocelot as an API … Implement Ocelot API Gateway: AIM: In this article, we will see how to route to different microservices through ocelot gateway. Actual Behavior / Motivation for New Feature. The code above setups up the mappings dictionary of (see below) your application gateway to the downstream services. In eShopOnContainers, when developing locally and using just your development machine as the Docker host, you are not using any ingress but only the multiple API Gateways. Then, you can directly access the Catalog microservice and see its methods through the Swagger UI accessing directly through that "external" port, in this case http://localhost:5101/swagger: Figure 6-31. The UpstreamPathTemplate is the URL that Ocelot will use to identify which DownstreamPathTemplate to use for a given request from the client. Add the following to your startup Configure method: Add the following, at minimum, to your startup ConfigureServices method: NOTE: In order to get Ocelot to view the scope claim from Okta properly, you have to add the following to map the default Okta âscpâ claim to âscopeâ. In eShopOnContainers, its API Gateway implementation is a simple ASP.NET Core WebHost project, and Ocelotâs middleware handles all the API Gateway features, as shown in the following image: Figure 6-32. That way, the clients still call the same base URL but the requests are routed to multiple API Gateways or BFF. However I would like to consume the api from behind the Ocelot Api Gateway. In this tutorialm we will learn how to craete microservices in .Net core and api geteway using ocelot. Ocelot will act as a reverse proxy for a secured internal ASP.NET Core Web API. As a key takeaway, for many medium- and large-size applications, using a custom-built API Gateway product is usually a good approach, but not as a single monolithic aggregator or unique central custom API Gateway unless that API Gateway allows multiple independent configuration areas for the several development teams creating autonomous microservices. Finally, the UpstreamHttpMethod is used so Ocelot can distinguish between different requests (GET, POST, PUT) to the same URL. For instance, when visiting the upstream URL http://localhost:5202/api/v1/c/catalog/items/2/ served by the webshoppingapigw API Gateway, you get the same result from the internal Downstream URL http://catalog-api/api/v1/2 within the Docker host, as in the following browser. This project is aimed at people using .NET running a micro services / service oriented architecture that need a unified point of entry into their system. Update your ocelot.json file by updating the re-routes section. That diagram shows how the whole application is deployed into a single Docker host or development PC with "Docker for Windows" or "Docker for Mac". Ocelot should be working with Windows Authentication. Either run the full eShopOnContainers solution from Visual Studio (it runs all the services in the docker-compose files), or start the Catalog microservice with the following docker-compose command in CMD or PowerShell positioned at the folder where the docker-compose.yml and docker-compose.override.yml are placed. Ocelot is an API Gateway for .NET platform. There are other important features to research and use, when using an Ocelot API Gateway, described in the following links. In other words, an API gateway is an API management server that has information about endpoints. Revision 9abd47b0. The reference microservice application eShopOnContainers is currently using features provided by Envoy to implement the API Gateway instead of the earlier referenced Ocelot. If there is, then the ReRoute will use that provider when it executes. What is Ocelot? In order to use IdentityServer bearer tokens, register your IdentityServer services as usual in ConfigureServices with a scheme (key). However, direct-access communication to the microservice, in this case through the external port 5101, is precisely what you want to avoid in your application. A possible approach is to use a direct client-to-microservice communication architecture. Having the API Gateway's boundaries dictated by the business or domain will help you to get a better design. However, when targeting a "production" environment based on Kubernetes, eShopOnContainers is using an ingress in front of the API gateways. Restricting Access to API after secure key validation can be done with Claims added to JWT To… This command only runs the catalog-api service container plus dependencies that are specified in the docker-compose.yml. … Because of testing or debugging reasons, if you wanted to directly access to the Catalog Docker container (only at the development environment) without passing through the API Gateway, since 'catalog-api' is a DNS resolution internal to the Docker host (service discovery handled by docker-compose service names), the only way to directly access the container is through the external port published in the docker-compose.override.yml, which is provided only for development tests, such as http://localhost:5101/api/v1/Catalog/items/1 in the following browser. https://ocelot.readthedocs.io/en/latest/features/qualityofservice.html, Rate limiting Kong controls layer 4 and 7 traffic and is extended through Plugins, which provide extra functionality and services beyond the core platform. Ocelot currently only supports this in the form of another http request (in the future this could be any transport mechanism). Ocelot is designed to work with .NET Core only and is currently on netcoreapp3.1. 1. A Kubernetes Ingress acts as a reverse proxy for all traffic to the app, including the web applications, that are out of the Api gateway scope. Going much further in the design, sometimes a fine-grained API Gateway can also be limited to a single business microservice depending on the chosen architecture. The ingress, however, is just redirecting HTTP requests but not trying to hide any microservice or web app. Use of Middleware in ASP.NET Core 3.1 - Lesson 1. A key difference between API Gateways and general Reverse Proxies is that the former tend to be message based whereas a reverse proxy is stream based. Testing the Catalog microservice with its Swagger UI. Ocelot is a .NET API Gateway. However, when developing, you want to access the microservice/container directly and run it through Swagger. Kong is a scalable, open source API Layer (also known as an API Gateway, or API Middleware). Even Microsoft uses ocelot, you can see the implementations in their articles. However, deploying into any orchestrator would be similar, but any container in the diagram could be scaled out in the orchestrator. The following architecture diagram shows how API Gateways were implemented with Ocelot in eShopOnContainers. Here's a simplified example of ReRoute configuration file from one of the API Gateways from eShopOnContainers. I could use ocelot with custom basic authorization but could not accomplish to use with Azure Active Directory. In the following diagram, you can also see how the aggregator services work with their related API Gateways. Also, we will be handling cross cutting concerns like authentication, rate limiting etc at gateway level itself. In that example, when the authorization middleware is called, Ocelot will find if the user has the claim type 'UserType' in the token and if the value of that claim is 'employee'. Through ocelot:- In the case of the "Marketing" business area and microservices, it is a simple use case so there was no need to use aggregators, but it could also be possible, if needed. What is Ocelot? When Ocelot runs it will look at this Routes AuthenticationOptions.AuthenticationProviderKey and check that there is an Authentication provider registered with the given key. Ocelot is an API Gateway for .NET platform. And you can avoid that by setting the additional level of indirection of the API Gateway (Ocelot, in this case). Ocelot should be working with Windows Authentication. That redirects the HTTP request to visit the Identity or auth microservice to get the access token so you can visit the protected services with the access_token. Use of Middleware in ASP.NET Core 3.1 - Lesson 2. After the authentication service is added, Ocelot will then authorize the resources that each request can access based on the authorization key. Because the Ocelot WebHost is configured with the authenticationProviderKey = "IdentityApiKey", that will require authentication whenever that service has any requests without any auth token. You install Ocelot and its dependencies in your ASP.NET Core project with Ocelot's NuGet package, from Visual Studio. Then, when deploying to Docker, there will be four API-Gateway containers created from that same Docker image, as shown in the following extract from the docker-compose.yml file. If a Route is authenticated Ocelot will invoke whatever scheme is associated with it while executing the authentication … You can notice how when the diagram shows the possible requests coming from the API Gateways it can get complex. If you donât understand how to do this please consult the IdentityServer documentation. It can have Authentication, monitoring, load balancing, caching, request fragmentation and management Static response processing, etc. If there isn’t then Ocelot will not start up, if there is then the Route will use that provider when it executes. They also have a very detailed documentation . .NET Core Microservices - Ocelot API Gateway. It is designed to work with .NET Core only and is currently built to netcoreapp2.0. It's lightweight, fast, and scalable and provides routing and authentication among many other features. https://{subdomain}.okta.com/oauth2/{authidentifier}, // Map Okta scp to scope claims instead of http://schemas.microsoft.com/identity/claims/scope to allow ocelot to read/verify them. That is, an API Gateway will typically buffer every request and response message to be able to perform transformations. It provides a single and unified API entry for accessing one or more internal APIs. Kong is a scalable, open source API Layer (also known as an API Gateway, or API Middleware). This ASP.NET Core WebHost project is built with two simple files: Program.cs and Startup.cs. Each container mounts its related configuration file in the container's folder named /app/configuration. In an Ocelot API Gateway you can sit the authentication service, such as an ASP.NET Core Web API service using IdentityServer providing the auth token, either out or inside the API Gateway. Position of the Identity service in eShopOnContainers. Because eShopOnContainers application has split the API Gateway into multiple BFF (Backend for Frontend) and business areas API Gateways, another option would have been to create an additional API Gateway for cross-cutting concerns. I'm setting up authentication with jwt auth in ocelot (api gateway in asp.net core), but has not succeeded. If there isnât then Ocelot will not start up, if there is then the Route will use that provider when it executes. There's one file for each BFF/APIGateway. We delve into more details in the previous section Creating composite UI based on microservices. Ocelot is an open-source API Gateway … API Gateways are front-ends or façades surfacing only the services but not the web applications that are usually out of their scope. Gateway to Authentication; Gateway to Catalog; Gateway to Ledger; Testing the routes out. We will have to configure all these routes within the API Gateway so that Ocelot knows how and where to route the incoming requests. Ocelot. If you try to access any secured microservice, like the Basket microservice with a ReRoute URL based on the API Gateway like http://localhost:5202/api/v1/b/basket/1, then you'll get a 401 Unauthorized unless you provide a valid token. A modern fast, scalable API gateway … Therefore, the selected way to implement aggregation in eShopOnContainers is with an explicit ASP.NET Core Web API service for each aggregator. The OcelotApiGw base project in eShopOnContainers. This project is aimed at people using.NET running a micro services / service oriented architecture that need a unified point of entry into … If there isn't, then Ocelot will not start up. The only file needed to define each API Gateway / BFF with Ocelot is a configuration file. When the client accesses the downstream service through Ocelot, in order to protect the downstream resources, the server will authenticate.At this time, the authentication service needs to be added in ocelot. It is also capable of performing authentication, rate limiting, load balancing, and more. Here are few noticable Features of Ocelot… Ocelot is fast, scaleable and provides authentication, … Implement Ocelot API Gateway: AIM: In this article, we will see how to route to different microservices through ocelot gateway. Zoom in vision of the Aggregator services. In addition, the infrastructure assets such as databases, cache, and message brokers should be offloaded from the orchestrator and deployed into high available systems for infrastructure, like Azure SQL Database, Azure Cosmos DB, Azure Redis, Azure Service Bus, or any HA clustering solution on-premises. 1. Figure 6-38. The important point here for Ocelot is the configuration.json file that you must provide to the builder through the AddJsonFile() method. Ocelot is designed to work with ASP.NET Core only. C# knowledge. Multiple web applications, each uses a different API gateway. Also, we will be handling cross cutting concerns like authentication, rate limiting etc at gateway level itself. Ocelot is an Open Source .NET Core-based API Gateway especially made for microservices architectures that need unified points of entry into their systems. This Article explains about the JWT Token authentication and the implementation of JWT token validation in Ocelot Gateway API. 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