Figure 6-38. This project is intended for people using .NET/Core running a micro service/service oriented architecture that needs a unified … In the source code files of eShopOnContainers, the original "configuration.json" files can be found within the k8s/ocelot/ folder. In eShopOnContainers, the "Generic Ocelot API Gateway Docker Image" is created with the project named 'OcelotApiGw' and the image name "eshop/ocelotapigw" that is specified in the docker-compose.yml file. As you can also notice in the diagram, having several API Gateways allows multiple development teams to be autonomous (in this case Marketing features vs. Shopping features) when developing and deploying their microservices plus their own related API Gateways. This article covers how to create microservices using ASP.NET Core, how to create API gateways using Ocelot, how to create repositories using MongoDB, how to handle JWT in microservices, how to unit test microservices using xUnit and Moq, how to monitor microservices using health checks, and finally how to deploy microservices using Docker containers on Linux distributions. But as introduced in the architecture and design sections, if you really want to have autonomous microservices, it might be better to split that single monolithic API Gateway into multiple API Gateways and/or BFF (Backend for Frontend). After the authentication service is added, Ocelot will then authorize the resources that each request can access based on the authorization key. We delve into more details in the previous section Creating composite UI based on microservices. Issue 446 that contains some code and examples that might help with Okta integration. Figure 6-28. eShopOnContainers architecture with API Gateways. 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. API Gateways are front-ends or façades surfacing only the services but not the web applications that are usually out of their scope. This command only runs the catalog-api service container plus dependencies that are specified in the docker-compose.yml. Users have to be in their Startup.cs But they provide a scheme (authentication provider key) for each registration, such as Also, we will be handling cross cutting concerns like authentication, rate limiting etc at gateway level itself. This pattern not only helps to reduce the chattiness and latency in the communication, it also improves the user experience significantly for the remote apps (mobile and SPA apps). https://ocelot.readthedocs.io/en/latest/features/qualityofservice.html, Rate limiting That way, the client app won't directly access the microservice. What is Ocelot? The API gateway is the only entry in the microservice architecture. Ocelot is designed to work with ASP.NET Core only. I execute my code in postman, but the output is not as expected. A modern fast, scalable API gateway … You can notice how when the diagram shows the possible requests coming from the API Gateways it can get complex. The Program.cs just needs to create and configure the typical ASP.NET Core BuildWebHost. Plus, at the same time they can reuse the same Ocelot Docker image. If you add scopes to AllowedScopes Ocelot will get all the user claims (from the token) of the type scope and make sure that the user has all of the scopes in the list. Figure 6-39. An API Gateway is basically an interface. Ocelot api gateway. This ASP.NET Core WebHost project is built with two simple files: Program.cs and Startup.cs. "https://whereyouridentityserverlives.com", // Okta Authorization Issuer URI URL e.g. Figure 6-35. In this case, the SQL Server container and RabbitMQ container. The code above setups up the mappings dictionary of (see below) your application gateway to the downstream services. The Basic Auth plugin checks the Proxy-Authorization and Authorization headers for valid credentials and approves or denies the access request accordingly. After the authentication service is added, Ocelot … https://ocelot.readthedocs.io/en/latest/features/logging.html, Quality of Service (Retries and Circuit breakers) at the API Gateway tier Because the Ocelot WebHost is configured with the authenticationProviderKey = "IdentityApiKey", that will require authentication whenever that service has any requests without any auth token. Normally, you won't be deploying with docker-compose into a production environment because the right production deployment environment for microservices is an orchestrator like Kubernetes or Service Fabric. Through ocelot:- Since eShopOnContainers is using multiple API Gateways with boundaries based on BFF and business areas, the Identity/Auth service is left out of the API Gateways… The ingress tier in eShopOnContainers when deployed into Kubernetes. Gateway to Authentication; Gateway to Catalog; Gateway … However, when targeting a "production" environment based on Kubernetes, eShopOnContainers is using an ingress in front of the API gateways. Certification. In previous article we have gone through base setup & Rate Limiting . 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. Having the API Gateway's boundaries dictated by the business or domain will help you to get a better design. However I would like to consume the api from behind the Ocelot Api Gateway. Update your ocelot.json file by updating the re-routes section. Some of the most common methods of API gateway authentication include: Basic Authentication. Ocelot is open source and designed for .Net. This project is intended for people using .NET/Core running a micro service/service oriented architecture that needs a unified entry point on their system. For instance, fine granularity in the API Gateway tier can be especially useful for more advanced composite UI applications that are based on microservices, because the concept of a fine-grained API Gateway is similar to a UI composition service. I'm not sure how to implement this in Ocelot… Kong controls layer 4 and 7 traffic and is extended through Plugins, which provide extra functionality and services beyond the core platform. What is Ocelot? Figure 6-41. Here are few noticable Features of Ocelot. Figure 6-37. eShopOnContainers architecture with aggregator services. In order to use IdentityServer bearer tokens, register your IdentityServer services as usual in ConfigureServices with a scheme (key). Users have to be in their Startup.cs But they provide a scheme (authentication … Ocelot is an API Gateway for .NET platform. That configuration.json is where you specify all the API Gateway ReRoutes, meaning the external endpoints with specific ports and the correlated internal endpoints, usually using different ports. Ocelot is fast, scalable and provides mostly all features you consider as mandatory when building an API gateway. 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. When Ocelot runs it will look at this Routes AuthenticationOptions.AuthenticationProviderKey and check that there is an Authentication provider registered with the given key. Ocleot is an API Gateway aimed at people using .NET running a micro services / service orientated architecture that need a unified point of entry into their system. The ValidAudiences such as "basket" are correlated with the audience defined in each microservice with AddJwtBearer() at the ConfigureServices() of the Startup class, such as in the code below. Actual Behavior / Motivation for New Feature. Ocelot api gateway. Ocelot is a .NET API Gateway. When deploying to those environments you use different configuration files where you won't publish directly any external port for the microservices but, you'll always use the reverse proxy from the API Gateway. It is also capable of performing authentication, rate limiting, load balancing, and more. Actual Behavior / Motivation for New Feature. Reusing a single Ocelot Docker image across multiple API Gateway types. A possible approach is to use a direct client-to-microservice communication architecture. If you want to authenticate using JWT tokens maybe from a provider like Auth0 you can register your authentication middleware as normal e.g. In Kubernetes, if you don't use any ingress approach, then your services and pods have IPs only routable by the cluster network. The Global configuration allows overrides of ReRoute specific settings. Figure 4-12. You can see that the Catalog microservice is a typical ASP.NET Core Web API project with several controllers and methods like in the following code. It can have Authentication, … 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. There are two sections to the configuration. Ocelot is an API Gateway for .NET platform. When using docker-compose, the services names are provided by the Docker Host, which is using the service names provided in the docker-compose files. Since eShopOnContainers is using multiple API Gateways with boundaries based on BFF and business areas, the Identity/Auth service is left out of the API Gateways, as highlighted in yellow in the following diagram. The following architecture diagram shows how API Gateways were implemented with Ocelot in eShopOnContainers. About the Identity service, in the design it's left out of the API Gateway routing because it's the only cross-cutting concern in the system, although with Ocelot it's also possible to include it as part of the rerouting lists. To get a better picture of an API gateway, we need to know why it is essential to have an API gateway. If a Route is authenticated Ocelot will invoke whatever scheme is associated with it while executing the authentication middleware. Configure Authentication for Ocelot and send a request with or without an access token from some authority other than Ocelot. It can have Authentication, monitoring, load balancing, caching, request fragmentation and management Static response processing, etc. Everything here is … If a Route is authenticated Ocelot will invoke whatever scheme is associated with it while executing the authentication … Ocelot… 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. Here's a simplified example of ReRoute configuration file from one of the API Gateways from eShopOnContainers. There are other important features to research and use, when using an Ocelot API Gateway, described in the following links. When using Kubernetes (like in an Azure Kubernetes Service cluster), you usually unify all the HTTP requests through the Kubernetes Ingress tier based on Nginx. However, when developing, you want to access the microservice/container directly and run it through Swagger. Then, you also need to set authorization with the [Authorize] attribute on any resource to be accessed like the microservices, such as in the following Basket microservice controller. When using containers, the port specified at its dockerfile. Ocelot is a .NET API Gateway. https://ocelot.readthedocs.io/en/latest/features/servicediscovery.html, Caching at the API Gateway tier ThreeMammals/Ocelot: .NET core API Gateway, The main functionality of an Ocelot API Gateway is to take incoming HTTP requests and forward them on to a downstream service, currently as 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. Users must register authentication services in their Startup.cs as usual but they provide a scheme (authentication provider key) with each registration e.g. Ocelot’s primary functionality is to take incoming HTTP requests and forward them to a downstream service I use for the microservice project. 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. C# knowledge. It contains lots of things, such as Routing, Authentication, Service discovery, Logging.etc. There's one file for each BFF/APIGateway. Even Microsoft uses ocelot, you can see the implementations in their articles. Ocelot should be working with Windows Authentication. The API Gateway receives are calls and redirects to services. 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