Check the endpoints, and note that the IPs are the same as the Pods created in the first step: $ kubectl describe svc my-nginx When a Pod dies, it is automatically removed from the endpoints, and new Pods matching the Service’s selector will automatically get added to the endpoints. The Service’s selector will be evaluated continuously and the results will be POSTed to an Endpoints object also named my-nginx. These Pods are exposed through endpoints. Check your Service $ kubectl get svc my-nginxĪs mentioned previously, a Service is backed by a group of Pods.
View Service API object to see the list of supported fields in service definition. This specification will create a Service which targets TCP port 80 on any Pod with the run: my-nginx label, and expose it on an abstracted Service port (targetPort: is the port the container accepts traffic on, port: is the abstracted Service port, which can be any port other pods use to access the Service). It may look like the following:ĪpiVersion : v1 kind : Service metadata : name : my-nginx labels : run : my-nginx spec : ports : - port : 80 protocol : TCP selector : run : my-nginx $ kubectl apply -f nginx-svc.yaml Let’s create a NodeJS service definition. Like all other Kubernetes objects, a Service can be defined using a YAML or JSON file that contains the necessary definitions (they can also be created using just the command line, but this is not the recommended practice). Pods can be configured to talk to the Service, and know that communication to the Service will be automatically load-balanced out to some pod that is a member of the Service.
This address is tied to the lifespan of the Service, and will not change while the Service is alive. When created, each Service is assigned a unique IP address (also called clusterIP). This leads to a problem: if some set of Pods (call them “backends”) provides functionality to other Pods (call them “frontends”) inside your cluster, how do the frontends find out and keep track of which IP address to connect to, so that the frontend can use the backend part of the workload? Enter ServicesĪ Kubernetes Service is an abstraction which defines a logical set of Pods running somewhere in your cluster, that all provide the same functionality. Each Pod gets its own IP address, however in a Deployment, the set of Pods running in one moment in time could be different from the set of Pods running that application a moment later. If you use a Deployment to run your app, it can create and destroy Pods dynamically. They are born and when they die, they are not resurrected. In theory, you could talk to these pods directly, but what happens when a node dies? The pods die with it, and the Deployment will create new ones, with different IPs.
Open the registry editor (Start + R -> type "regedit" as command).Say, you have pods running nginx in a flat, cluster wide, address space. You may have to repeat it for all interfaces that it currently listens on. For stop listening HTTP ports on the current interface: For reassigning HTTP ports to different or dummy interfaces:ģ. If you are also facing the issue with the HTTP system process, then you can run the below commands to release ports 80 and 443. Temporary Fix: reassign HTTP listening IP They have started listening since I installed IIS Express for my development work. In my case, the issue was with the HTTP system service listening on ports 443 and 80. The ingress controller should automatically start listening once the other process is killed. But, if you don't see them being used by the docker backend, then you need to backtrace the application and kill that application. If the ingress is working, then you should see a docker backend process listening to ports 80 and 443.
So I suggest using the currports application (freeware) to look at what all ports are being used and by which applications. You can certainly use Powershell commands to do the same, but you won't get an overall view on ports currently accessed or used by other applications.
It is a simple utility to monitor network traffic on Windows operating system.
If you are in the same situation, then you should first download the currports tool (freeware), from the official website to inspect your host ports.