I'm using minikube to have a local Kubernetes cluster.
I enabled the ingress addon with the following command :
minikube addons enable ingress
I have created an application that turns actually in my cluster and also a service tied to it plus an ingress resource where mydomain.name will forward traffic to that service.
The issue that I have: this will not work if I don't add an entry like the following one to the /etc/hosts file :
<kubernetes_cluster_ip_adress> mydomain.name
I thought having the ingress controller with an ingress resource would do the DNS resolution & that I don't need to add any entry to the /etc/hosts file but maybe I am wrong.
Thank you for your help
Related
I have installed nginx ingress in kubernetes from official documenation. But while configuring the rules without mentioning the "host". I am getting the below erros.
error
++++++
spec.rules[0].host: Required value
Is it possible to configure it without host as I want to access it using only IP address
and I also found the below deployment file with which I am able to apply rules without "host". But not sure is this is safe to use. Please guide me here
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.44.0/deploy/static/provider/cloud/deploy.yaml
Do you mean to configure the ingress? The ingress controller is different from ingress itself. If you are configuring ingress, then host is completely optional. If host is omitted, all the http traffic is directed through IP address by default. Refer to this documentation for more info https://kubernetes.io/docs/concepts/services-networking/ingress/
I have installed the nginx ingress controller on GKE from
https://github.com/kubernetes/ingress-nginx via helm chart
it does create the controller and also an firewall rule. The rule is open for all public ips.
Is there a way to restrict this via the helm chart ?
if not any way go get the auto generated firewall rule via terraform and adjust ?
the name of the firewall rule looks like this: k8s-fw-a8301409696934895b9facd9232892dc
Thanks
nginx ingress creates a loadBalancer service to expose it on GKE. You can define the spec.loadBalancerSourceRanges field in the service definition with the IPs you would like to allow access, all other IPs will be filtered. The default value for this field is 0.0.0.0 and the GCE firewall rules are created based on this field.
Note that you can also leverage the Nginx ingress controller to limit which IPs can connect, however, this still allows alls traffic to reach the node.
We currently have pods in a kubernetes cluster (AKS) that need to resolve two different domains.
The first domain beeing the cluster domain default.svc.cluster.local and the second one beeing mydns.local
how can this be achieved?
I found the solution myself.
There are two ways to achieve the desired name resolution:
If your AKS Cluster is within an Azure VNET you can set the DNS settings in the VNET to the custom DNS Server that is able to resolve your custom domain. If your Pods have no specified dns settings then the resolution will work this way:
First the Pods try to resolve the DNS request within CoreDNS, if they can't then they take the DNS settings of the host and ask the DNS Server configured in the host. Since in azure the DNS settings of the VNET are applied to the Virtual Machines it will ask the correct DNS server.
Modify the coreDNS settings in your AKS cluster with the following json :
apiVersion: v1
kind: ConfigMap
metadata:
name: coredns-custom
namespace: kube-system
data:
yourdns.server: |
yourdns.com:53 {
errors
cache 1
proxy . 10.1.0.40
}
Important to know is, that in AKS you can't overwrite the coredns ConfigMap. The Kubernetes master will always reset it to the default after a couple of seconds. If you want to edit the ConfigMap in AKS you have to name the configmap "coredns-custom".
yourdns.server is actually not the server. It is the domain.server. The DNS server IP is behind the proxy setting.
I think you can use ingress and ingress controller to manage the domain and path.with ingress you can manage multiple domain and attch service to particular domain.
https://kubernetes.github.io/ingress-nginx/
Here also sharing tutorial to setup ingress from digital ocean you can follow it :
https://www.digitalocean.com/community/tutorials/how-to-set-up-an-nginx-ingress-with-cert-manager-on-digitalocean-kubernetes
Your second point "2.Modify the coreDNS settings in your AKS cluster with the following json :"
Note that the "forward" plugin should be used in place of "proxy" as noted here:
https://github.com/Azure/AKS/issues/1304
Im new to Ingress(k8s) and studying via documentation. Here is the
official documentation - Ingress Minikube. Under Create and ingress resource, I've already done steps 1-3 with no problem but I can't seem to do what step 4 asks. I have located the file inside the ingress-nginx-controller pod: /etc/hosts; but I can't seem to have any idea on how to edit it. I can't install vim-tiny or any other editing tools due to permission being denied. Sudo does not work. I just want to edit the /etc/hosts file.
This particular step (#4) should be done at your localhost, not inside ingress-controller pod. It`s just for mapping of hostname to IP addresses, so that you can verify if you can reach your application from outside exposed by Ingress resource.
that is ip address or step is to setup DNS A record which expose your application to outside netwrok kubernetes cluster.
ingress > service > POD
I am new to Kubernetes and wanted to understand how I can expose a service running in Kubernetes to the outside world. I have exposed it using a NodePort on the cluster.
So, for example: A service exposes port 31234 on the host and I can get to the service from another server through https://kubeserverIP:31234.
What I want to achieve is serve this service through nginx (on a different server, out of Kube control) via a url,say, http://service.example.com. I have tried deploying nginx with an upstream pointing to the service but that is not working and get a bad gateway error.
Is there something which I am missing here? Or is there a neater way of achieving this.
I have a baremetal installation of Kubernetes cluster and have no access to gce load balancer or other vendor LBs.
Thanks
Thanks for pointing in the right direction.
Essential steps broadly were:
Create an app and its service definition.
Create a namespace for ingress.
Create a default backend deployment and service for redirecting all requests not defined in Ingress rules. Create these in the ingress space
Create the nginx ingress controller deployment.
Create RBAC rules.
Finally create the ingress rule for the applications with the paths and the ports.
Found a very useful guide which explained things in details:
https://akomljen.com/kubernetes-nginx-ingress-controller/
You're almost there! Your next step will be to setup a ingress controller. There is an NGINX Ingress controller plugin that you can checkout here.
Edit: Here's an example configuration: https://github.com/nginxinc/kubernetes-ingress/tree/master/examples/complete-example