The Astronomers Titletown, Articles A

ASP.NET Core Kubernetes series consists of the following articles: Deploy ASP.NET Core App on Kubernetes Set additional information of the project like Target Framework, Authentication Type, Enable Https, Enable Docker, Docker OS Support Etc. View Kubernetes cluster information. Now you have your ASP.NET Core application, running in Linux containers, and deployed to an AKS cluster on Azure. Kubernetes runs in a local environment with docker desktop. Adding orchestrator support to WebApi project. I will start with Docker and Minikube then I will take the topic of Kubernetes Objects which are Pods, Deployments and Services. Thank you friend for the update on Ingress. A question arises why use Ingress when the Service is exposing the Pod to HTTP and HTTPS routes? The consent submitted will only be used for data processing originating from this website. It requires an ingress controller for routing the rules specified in the ingress object. I can login and logout from docker cmd. First open Visual Studio and create a new Web Application. Here's the command to install the ingress-nginx controller. They act as reverse proxies for your services, load-balancing requests between different services running on different nodes. This will apply the configuration and create the service called first-service. I've said that Kubernetes is an orchestrator, but what does that really mean? A Kubernetes Ingress acts as a reverse proxy for all traffic to the app, including the . Just close the command prompt window and open a new one. Create the file .dockerignore (with a dot at the beginning): Open a command prompt and build the docker image (the dot at the end is important): Stop your Angular app if it still running. The Ingress code is very simple so let us go through them. Congrats, you completed this very long ASP.NET Core Kubernetes Tutorial which explains how to host your app in Kubernetes by using Pods, Deployments and Services. In this post, we'll deploy a simple ASP.NET Core app to Kubernetes running on Google Kubernetes Engine (GKE) and configure it to be managed by Istio. How to use Kubernetes Ingress on an ASP.NET Core app Kubernetes: Host Multi-Container ASP.NET Core app to Single Pod Kubernetes: Host Multi-Container ASP.NET Core app to Multiple Pods Kubernetes Volume emptyDir and SSL Mount to volume Kubernetes Persistent volumes (PV) and Persistent Volume Claim (PVC) Kubernetes Liveness Readiness Startup Probes 1. Example: So, to delete this object the command will be: Now coming to the spec section which is quite big and tells deployment how it should create and manage the pods, what these pods will do and the container which will be contained by these pods. The *.ingress.tls parameter can be used to add the TLS configuration for this host. The reality is less clearly segregated, but if you're not managing the cluster, it's probably not something you need to worry about. Disable HTTPS: Add a new controller "DemoController". Console output from the push command. This means, that you map the external DNS traffic to the internal Kubernetes service endpoints. On my last tutorial I created the Service with the YAML file which is given below. Managing ASP.NET Core app hosted on Kubernetes - YogiHosting Pods can also communicate with one another and with the k8s cluster. So the Ingress will only match requests where the host is yogihosting.com. Implement API Gateways with Ocelot - GitHub LoadBalancer this type of service is used in the cloud like Azure. Next, there is an annotations field which controls the URL rewriting. Kubernetes Ingress does not accommodate CSS files for Visual Studio I have given it the value of forward slash (/). So, an Ingress can control multiple services and this reduces complexities. Now I will create a Kubernetes Ingress for the same ASP.NET Core app. You can see how to create the AKS Cluster for this sample in section Deploy to Azure Kubernetes Service (AKS) on this guide. asp.net core - Swagger UI behind Nginx ingress route api are returning Create an ASP.NET Core 5.0 Web API project and call it DemoApi. Selecting ASP.NET CORE 6.0 and Web API project type. Some examples are containerd & CRI-O. 1. When I try to create a tunnel, browser is opened, but it times out. Open another command prompt window and enter, 2. All components are dockerized and Kubernetes orchestrates the containers. To facilitate this, the *.ingress.extraHosts parameter (if available) can be set with the host names specified as an array. So this means Ingress will serve your app when the Ingress IP is called on the browser. Welcome to our ASP.NET Core Kubernetes tutorial series which will guide you how to work with this technology when hosting your apps to kubernetes. Ingresses effectively act as a reverse-proxy for your app. ASP.NET Core is a general-purpose development platform maintained by Microsoft and the .NET community on GitHub. For example, imagine you have a service called purchasing-api that your "Ordering API" pods need to invoke. You can run Docker containers without an orchestrator using docker run payment-api, so what does Kubernetes add? In this post I describe the problem, explain why it happens, and show how I worked around it by hooking into ASP.NET Core's IHostApplicationLifetime abstraction. Even if you're heading towards smaller services, it's not necessary to immediately jump on the band wagon. Install Visual Studio Community (its free) with the ASP.NET and web development workload. You can do this by the cd command. No, wildcard covers only single DNS label. Kubernetes: Host Multi-Container ASP.NET Core app to Single Pod Warning Failed 21s (x2 over 37s) kubelet Failed to pull image "pocdemo-pod:latest": rpc error: code = Unknown desc = Error response from daemon: pull access denied for pocdemo-pod, repository does not exist or may require 'docker login': denied: requested access to the resource is denied Now I will tell you how to enter this VM. Therefore, communication with IP addresses will break sometime in the future. Principal Engineer, Software at Harman International, A Samsung Company, Understanding Angular and Creating Your First Application, How to deploy a .NET 5 API in a Kubernetes cluster, Build and run Angular application in a Docker container, how to add a MySql database and MongoDB replica set to your architecture, how to use events for inter-microservice communication, How to use Redis and Lua Scripts in a C# ASP.NET Core Microservice Architecture, How to Scale an ASP.NET Core Microservice and Sharded Database. Each container image needs to be tagged with the loginServer name of the registry. Part 1 - An Introduction to Kubernetes; Part 2 - Configuring resources with YAML manifests; Part 3 - An introduction to deploying applications with Helm (this post) Part 4 - Creating a Helm chart for an ASP.NET Core app The Global configuration allows overrides of ReRoute specific settings. tl;dr; Nodes are VMs that run your app. To get it to work I used an Ingress and minikube tunnel. It will open a tunnel and then a new tab is opened on the browser where you you will see your ASP.NET Core app. This tells k8s that the object being created by the configuration file is a Service. The matchLabels tell the deployment to apply itself to only those Pods which have the labels component: web. Add the new controller, "DemoController". What is relatively common is having "supporting" containers deployed alongside the "main" container in a pod, using the sidecar pattern. In the example of the Ingress shown below there is one host called yogihosting.com, the ingress exposes 2 services based on different paths. The ability to deploy "pods" rather than individual containers like this makes composability and handling cross-cutting concerns easier. You can view the loginServer name from the Azure portal, taking the information from the Azure Container Registry, Figure 4-47. You can save this file in any directory of your pc. If you need an ingress controller or example applications, see Create an ingress controller.. There are 2 fields: I specified that the 8080 port of the service should be mapped to port 80 of the container. In this ASP.NET Core Kubernetes Ingress turorial we will create an Ingress for accessing the app on the browser. Finally, there is ports field that specifies how the ports of the service will be mapped to that of the container running inside of a Pod. No, host is not same as the suffix of the wildcard rule. Enter the project name and location in Visual Studio 2022. Now I will explain how annotations and paths can be made dynamic using regular expression. Scott Hanselman has also a recent 101 introduction to containers. Now save the deployment file with any name of your choice and with a .yaml extension. They can still re-publish the post if they are not suspended. View of the name of the Registry, Figure 4-48. ASP.NET Core Kubernetes series consists of the following articles: In the last tutorial I had created an ASP.NET Core app and hosted it on a Pod. To access a k8s service on the browser run the minikube service servicename command on command prompt. Recall, you will have to build the image inside the minikubes VM. code of conduct because it is harassing, offensive or spammy. DEV Community A constructive and inclusive social network for software developers. .Net Core microservices: using HTTPS on Kubernetes on Azure (AKS) Rather than having to hard code real IP Addresses or other sorts of hacks, Kubernetes assigns a standard DNS record to the service: By sending requests to this domain, the Ordering API can call the "Purchasing API" without having to know the correct IP Address for an individual pod. To update an Ingress change its YAML configuration file then apply the new changes with the kubectl apply -f command. One of the key strengths of Kubernetes - its flexibility - is also one of the things that I think makes it hard to grasp. 2. wildcard only covers a single DNS label. Here comes the service which connects with the pods not with their IP address but with selector (recall I discussed selector during the time of Deployment in the above section). Deploying ASP.NET Core applications to Kubernetes - Part 1. Finally, there is ports field which specifies the container port that will be opened. Now you're almost ready to deploy using kubectl, but first you must get the credentials from the AKS Cluster with this command: Figure 4-51. @media(min-width:0px){#div-gpt-ad-yogihosting_com-banner-1-0-asloaded{max-width:300px;width:300px!important;max-height:250px;height:250px!important}}if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'yogihosting_com-banner-1','ezslot_4',186,'0','0'])};__ez_fad_position('div-gpt-ad-yogihosting_com-banner-1-0'); In Declarative Object configuration, we define objects in a configuration file and tell kubectl to create the object based on this configuration file. This can improve performance (there's more instances of your app able to handle requests) and reliability (if one pod crashes, other pods can hopefully take up the slack). Run the app in visual studio. Note that Always is the default value and if you want then you can simply omit the imagePullPolicy field. In this section I provide secretName field with the value mysecret. I will come to the service section in a moment. Of course, you can also list the images using the docker images command. As you can see, the integration between Visual Studio 2022 and Docker is completely oriented to the developer's productivity. Get the name of the registry using az cli. Once unpublished, this post will become invisible to the public and only accessible to Christian Zink. This will take you inside the VM created by Minikube. Start the Angular app and open it in your browser to see if everything is working: It should load and display the data Hello World: I will show you two different ways to create and run a docker image. For example, in one ingress controller implementation, Kubernetes configures your ingresses by configuring an instance of NGINX for you. I have given path: / field, the / specifies all paths will be matched. Check the highlighted below code which has another host field targeting another domain. ASP.NET Core Kubernetes Tutorial for AKS - The Couchbase Blog Services are essentially internal to the Kubernetes cluster. Side note: the name "pod" comes from the collective noun for a group of whales, so think of a pod as a collection of your Docker (whale) containers. Upgrade to Microsoft Edge to take advantage of the latest features, security updates, and technical support. This series does not focus on using Docker with ASP.NET Core in general. Build the Image inside Minikubes Virtual Machine, Notice the Ready column against the deployment and pods. This will open your app. You'll also notice that by default controller option is checked. See some examples that help you to understand the result: The backend field specifies the K8S Service and the service port number to be targeted. In this ASP.NET Core Kubernetes Ingress turorial we will create an Ingress for accessing the app on the browser. They're used to logically group resources. More than one labels can be used for an object. Orchestration in my mind is primarily about two things: Deployments in Kubernetes are related to the first of those points, managing the lifetime of containers. First in my command prompt, I go to the directory containing this YAML file and run the kubectl apply. After that, you add orchestrator support for your WebApi project as shown next, in image 4-40. In short, we will use Declarative Object Configuration approach. In production you should use Ingress for exposing your app to HTTP and HTTPS routes, you should not expose your service like what I did in the previous tutorial. In our example, exploredocker.azurecr.io. @media(min-width:0px){#div-gpt-ad-yogihosting_com-banner-1-0-asloaded{max-width:300px;width:300px!important;max-height:250px;height:250px!important}}if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'yogihosting_com-banner-1','ezslot_4',186,'0','0'])};__ez_fad_position('div-gpt-ad-yogihosting_com-banner-1-0');@media(min-width:0px){#div-gpt-ad-yogihosting_com-banner-1-0_1-asloaded{max-width:300px;width:300px!important;max-height:250px;height:250px!important}}if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'yogihosting_com-banner-1','ezslot_5',186,'0','1'])};__ez_fad_position('div-gpt-ad-yogihosting_com-banner-1-0_1');.banner-1-multi-186{border:none!important;display:block!important;float:none!important;line-height:0;margin-bottom:7px!important;margin-left:auto!important;margin-right:auto!important;margin-top:7px!important;max-width:100%!important;min-height:250px;padding:0;text-align:center!important}. If you would like to change your settings or withdraw consent at any time, the link to do so is in our privacy policy accessible from our home page.. This myobj.yaml file would contain the below instructions/codes: @media(min-width:0px){#div-gpt-ad-yogihosting_com-large-leaderboard-2-0-asloaded{max-width:300px;width:300px!important;max-height:250px;height:250px!important}}if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[300,250],'yogihosting_com-large-leaderboard-2','ezslot_5',187,'0','0'])};__ez_fad_position('div-gpt-ad-yogihosting_com-large-leaderboard-2-0');Notice that I specified kind: Deployment which means the configuration file is asking kubectl to create a Deployment. You'll now create the image in Release mode (ready for production) by changing to Release, as shown in Figure 4-46, and running the application as you did before. 1. An Ingress needs apiVersion, kind, metadata and spec fields. Activate Docker and use the "Linux" setting. Thanks! I will show you more in further posts: Kubernetes secrets, security aspects like SSL, communication, logging, debugging, CI/CD, Helm charts, (code) quality, (auto) scaling and self-healing, etc. Deploy ASP.NET Core app to Kubernetes on Google Kubernetes Engine I defined the field called apiVersion and given its value to v1. You are now ready to deploy your ASP.NET Core app on Kubernetes and expose it on HTTP with Ingress. @media(min-width:0px){#div-gpt-ad-yogihosting_com-leader-4-0-asloaded{max-width:336px;width:336px!important;max-height:280px;height:280px!important}}if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[336,280],'yogihosting_com-leader-4','ezslot_16',602,'0','0'])};__ez_fad_position('div-gpt-ad-yogihosting_com-leader-4-0'); Next, I defined the kind field as Service. ASP.Net Core 2.2 Kubernetes Ingress: not found static content for You can list your containers (your container IDs and timestamps will be different): Stop both containers so the ports are not blocked for the next step of this guide: Install the NGINX Ingress controller (in one line on the command line): See the NGINX Ingress Installation Guide for details. It requires 2 things: So now I will apply the Ingress Yaml file on my local k8s cluster. The URI segments given by the path field are as follows. If you're building a monolithic app, Kubernetes is unlikely to bring you value. The api version of the Ingress should be networking.k8s.io/v1 and kind should be specified as Ingress. The container states needed for running the image. Here is what you can do to flag christianzink: christianzink consistently posts content that violates DEV Community's The below command will delete an object with this way. The cloud provider provisions a load balancer for your Service. This service is only reachable from within the cluster and not from outside. Suppose there is a URI match for all of these 3, then they will be rewritten as: Then comes the spec section which has all the information needed to configure the Ingress. Your email address will not be published. Please contact me if you have any questions, ideas, or suggestions. Posted on Apr 10, 2021 Build ASP.NET Core applications deployed as Linux containers into AKS With labels, we can select an object. Welcome to YogiHosting - A Programming Tutorial Website. In this series I've frequently described a common pattern for deploying ASP.NET Core applications: See the below Ingress yaml file of an Ingress called some-ingress which has a DefaultBackend. In my case I specified the port 80 to be opened inside the container. To fix you will need to first describe you pod: kubectl describe pod ingress-nginx-controller-xxxxx -n ingress-nginx. In this guide, you will create a raw microservice-based cloud architecture.