I have deployment that hosts a website on port 9001 and a service attached to it. I want to allow anyone (from outside cluster) to be able to connect to that site.
Any help would be appreciated.
I want to allow anyone (from outside cluster) to be able to connect to that site
There are many ways to do this using kubernetes services to expose port 9001 of the website to the outside world:
Service type LoadBalancer if you have an external, cloud-provider's load-balancer.
ExternalIPs. The website can be hit at ExternalIP:Port.
Service type NodePort if the cluster's nodes are reachable from the users. The website can be hit at NodeIP:NodePort.
Ingress controller and ingress resource.
As you wrote that this is not a cloud deployment, you need to consider how to correctly expose this to the world in a decent fashion. First and formost, create a NodePort type service for your deployment. With this, your nodes will expose that service on a high port.
Depending on your network, at this point you either need to configure a loadbalancer in your network to forward traffic for some IP:80 to your node(s) high NodePort, or for example deploy HAProxy in a DeamonSet with hostNetwork: true that will proxy 80 to your NodePort.
A bit more complexity can be added by deployment of Nginx IngressController (exposed as above) and use of Ingress to make the Ingress Controller expose all your services without the need to fiddle with NodePort/LB/HAProxy for each of them individualy any more.
Related
Exposing Service from a BareMetal(Kubeadm) Build Kubernetes Cluster to the outside world. I am trying to access my Nginx as a service outside of the cluster to get NGINX output in the web browser.
For that, I have created a deployment and service for NGINX as shown below,
As per my search, found that we have below to expose to outside world
MetalLb
Ingress NGINX
Some HELM resources
I would like to know all these 3 or any more approaches in such way it help me to learn new things.
GOAL
Exposing Service from a BareMetal(Kubeadm) Built Kubernetes Cluster to the outside world.
How Can I make my service has its own public IP to access from the outside cluster?
You need to set up MetalLB to get an external IP address for the LoadBalancer type services. It will give a local network IP address to the service.
Then you can do port mapping (configuration in the router) of incoming traffic of port 80 and port 443 to your external service IP address.
I have done a similar setup you can check it here in detail:
https://developerdiary.me/lets-build-low-budget-aws-at-home/
You need to deploy an ingress controller in your cluster so that it gives you an entrypoint where your applications can be accessed. Traditionally, in a cloud native environment it would automatically provision a LoadBalancer for you that will read the rules you define inside your Ingress object and route your request to the appropriate service.
One of the most commonly used ingress controller is the Nginx Ingress Controller. There are multiple ways you can use to deploy it (mainfests, helm, operators). In case of bare metal clusters, there are multiple considerations which you can read here.
MetalLB is still in beta stage so its your choice if you want to use. If you don't have a hard requirement to expose the ingress controller as a LoadBalancer, you can expose it as a NodePort Service that will accessible across all your nodes in the cluster. You can then map that NodePort Service in your DNS so that the ingress rules are evaluated.
I want to set up a Kubernetes cluster on-Prem directly on VMs. Since we are not talking about using a cloud provider exposing my service as type LoadBalancer may not directly make sense. I understand MetalLB could be an option but I don’t have a pool of IP addresses to assign it.
I want an entry point into my cluster to which I can point my DNS A record to. I have a couple of solutions in mind but not sure if one is better than the other or there are other better solutions.
Exposing my service on NodePort and using an external load balancer. I can make the external LB my entry point.
Running an Ingress Controller on NodePort which routes traffic to my ClusterIP services internally. I could load balance between the Ingress NodePorts using an external LB and make it my entry point.
I only want to expose one service from my cluster to the outside world. In that case I am not sure how using Ingress will add any advantage.
Please help me out my sharing your thoughts and suggestions!
I want to deploy a website on my kubernetes cluster.
I followed this guide to set up my kubernetes cluster on my set of raspberries. Now I have tested it with some nginx containers and it works to a certain degree since I need to find the correct ip of the machine it is deployed on.
Now that I have a signed up a domain I like to forward the traffic to my deployed website on my kubernetes cluster.
I have done this before with nginx, certbot and letsencrypt without containerisation. Now I am just missing the part how kubernetes handles the network. I assumed it was similar to swarms network which forwards all the request to the correct machine. But kubernetes does it differently.
TLDNR: How to deploy a website on a self build raspberry pi kubernetes cluster?
You need to create Kubernetes Service (documentation) to expose the web service to the outside world.
There are two types of Services relevant to deployments outside of cloud providers:
ClusterIP: Exposes the Service on a cluster-internal IP. Choosing this value makes the Service only reachable from within the cluster.
This is the default ServiceType.
NodePort: Exposes the Service on each Node's IP at a static port (the NodePort). A ClusterIP Service, to which the NodePort Service
routes, is automatically created. You'll be able to contact the NodePort Service, from outside the cluster, by requesting <NodeIP>:<NodePort>.
So what you probably want is a NodePort service, which will expose the service on some fixed port on each of your Nodes (documentation and examples)
I have two Kubernetes developpements: one with a Grafana pod, and the other with an InfluxDB pod.
I want:
1) to expose my Grafana:3000 to the outside word
2) Grafana to be able to connect to InfluxDB:8086
I've seen it done with two separate "services": one Grafana Service (type = NodePort, target port = 3000) and one InfluxDB service (type = ClusterIP, target port = 8086).
It works ok.
Yet can/should it be done with just one "service" ?
For north south traffic i.e exposing a service outside the cluster LoadBalancer or preferably ingress is better than NodePort because when NodePort is used if the Node IP or Port changes then the clients need to make changes in the endpoint that they are using to access the service.
For east-west traffic between services within the cluster clusterIP service is good enough.
Use ingress. You can use Nginx, Caddy, or other tool provide ingress service and define the routing of the ingress there.
all
I knew well about k8s' nodePort and ClusterIP type in services.
But I am very confused about the Ingress way, because how will a request come into a pod in k8s by this Ingress way?
Suppose K8s master IP is 1.2.3.4, after Ingress setup, and can connect to backend service(e.g, myservice) with a port(e.g, 9000)
Now, How can I visit this myservice:9000 outside? i.e, through 1.2.3.4? As there's no entry port on the 1.2.3.4 machine.
And many docs always said visit this via 'foo.com' configed in the ingress YAML file. But that is really funny, because xxx.com definitely needs DNS, it's not a magic to let you new-invent any xxx.com you like be a real website and can map your xxx.com to your machine!
The key part of the picture is the Ingress Controller. It's an instance of a proxy (could be nginx or haproxy or another ingress type) and runs inside the cluster. It acts as an entrypoint and lets you add more sophisticated routing rules. It reads Ingress Resources that are deployed with apps and which define the routing rules. This allows each app to say what the Ingress Controller needs to do for routing to it.
Because the controller runs inside the cluster, it needs to be exposed to the outside world. You can do this by NodePort but if you're using a cloud provider then it's more common to use LoadBalancer. This gives you an external IP and port that reaches the Ingress controller and you can point DNS entries at that. If you do point DNS at it then you have the option to use routing rules base on DNS (such as using different subdomains for different apps).
The article 'Kubernetes NodePort vs LoadBalancer vs Ingress? When should I use what?' has some good explanations and diagrams - here's the diagram for Ingress: