Nginx Ingress Controller Returns 404 Kubernetes - docker

I am trying to create an ingress controller that points to a service that I have exposed via NodePort.
Here is the yaml file for the ingress controller (taken from https://kubernetes.io/docs/tasks/access-application-cluster/ingress-minikube/):
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: example-ingress
spec:
rules:
- host: hello-world.info
http:
paths:
- path: /
backend:
serviceName: appName
servicePort: 80
I can connect directly to the node port and the frontend is displayed.
Please note that I am doing this because the frontend app is unable to connect to other deployments that I have created and I read that an ingress controller would be able to solve the issue. Will I still have to add an Nginx reverse proxy? If so how would I do that? I have tried adding this to the nginx config file but with no success.
location /middleware/ {
proxy_pass http://middleware/;
}

You must use a proper hostname to reach the route defined in the Ingress object. Either update your /etc/hosts file or use curl -H "hello-world.info" localhost type command. Alternatively, you can delete the host mapping and redirect all traffic to one default service.
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: example-ingress
spec:
rules:
- http:
paths:
- path: /
backend:
serviceName: appName
servicePort: 80

Related

How to install "ingress-nginx"?

I got the following code that uses ingress-nginx within infra\k8s-dev\ingress-srv.yaml file.
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: ingress-service
annotations:
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/use-regex: "true"
spec:
rules:
- host: mysite.local
http:
paths:
- path: /api/users/?(.*)
pathType: Prefix
backend:
service:
name: auth-srv
port:
number: 3000
- path: /?(.*)
pathType: Prefix
backend:
service:
name: client-srv
port:
number: 3000
I searched through the internet and found the following command to install it:
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.4.0/deploy/static/provider/cloud/deploy.yaml
But I am not sure where should I run this command? Is there any ingress-nginx package that I also must install from NPM?
I am using Docker-Desktop on Windows 10 machine.
Command you have mentioned is right
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v1.4.0/deploy/static/provider/cloud/deploy.yaml
it self will download and apply the YAML config from URL, it will deploy the Nginx controller. Nginx ingress controller will manage the Ingress you are creating above.
Ingress is rule to divert the traffic and controller manages these rules (ingress).
So just running the apply to K8s cluster context will download and start the PODs of the Nginx controller.
as you mentioned in your ingress annotation
kubernetes.io/ingress.class: nginx
that specific ingress rule will get connected or managed by nginx controller.
inside the ingress you have mentioned mysite.local so make sure in local setup host file you are mapping the domain to IP.
Once controller is up and running opening the URL (mysite.local) into the browser will show the site.

Enable Ingress controller on Docker Desktop with WLS2

Currently, I'm using Docker Desktop with WSL2 integration. I found that Docker Desktop automatically had created a cluster for me. It means I don't have to install and use Minikube or Kind to create cluster.
The problem is that, how could I enable Ingress Controller if I use "built-in" cluster from Docker Desktop?
I tried to create an Ingress to check if this work or not, but as my guess, it didn't work.
The YAML file I created as follows:
apiVersion: apps/v1
kind: Deployment
metadata:
name: webapp
spec:
minReadySeconds: 30
selector:
matchLabels:
app: webapp
replicas: 1
template:
metadata:
labels:
app: webapp
spec:
containers:
- name: webapp
image: nodejs-helloworld:v1
---
apiVersion: v1
kind: Service
metadata:
name: webapp-service
spec:
selector:
app: webapp
ports:
- name: http
port: 3000
nodePort: 30090 # only for NotPort > 30,000
type: NodePort #ClusterIP inside cluster
---
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: webapp-ingress
spec:
defaultBackend:
service:
name: webapp-service
port:
number: 3000
rules:
- host: ingress.local
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: webapp-service
port:
number: 3000
I tried to access ingress.local/ but it was not successful. (I added ingress.local to point to 127.0.0.1 in host file. And the webapp worked fine at kubernetes.docker.internal:30090 )
Could you please help me to know the root cause?
Thank you.
Finally I found the way to fix. I have to deploy ingress Nginx by command:
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.41.2/deploy/static/provider/cloud/deploy.yaml
(Follows the instruction at https://kubernetes.github.io/ingress-nginx/deploy/#docker-for-mac. It works just fine for Docker for Windows)
Now I can access http://ingress.local successfully.
You have to install an ingress-nginx controller on your cluster, so that your nodes will have an opened port 80/443.
Using helm (v3 - see documentation):
helm install --namespace kube-system nginx ingress-nginx --repo https://kubernetes.github.io/ingress-nginx
Using kubectl (see documentation):
kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/controller-v0.43.0/deploy/static/provider/cloud/deploy.yaml
Then manually adding your ingresses' hostnames to /etc/hosts:
127.0.0.1 ingress.local
127.0.0.1 my.other.service.local
# ...
Then if you make a request on http://ingress.local:
the DNS resolution will route to your cluster node
then the ingress controller will serve the request on port 80
then ingress will route the request to the configured backend service
and the service will route to an available pod
The newest version of Docker Desktop for Windows already adds a hosts file entry: 127.0.0.1 kubernetes.docker.internal.
You had to do use kubernetes.docker.internal URL as a hostname in Ingress definition if you want to point to 127.0.0.1. This should be in the docs on this page kubernetes.github.io/ingress-nginx/deploy but there is no Docker Desktop for Windows section there.
Your files should look like this:
apiVersion: v1
kind: Service
metadata:
name: webapp-service
spec:
type: NodePort
selector:
app: webapp
ports:
- name: http
protocol: TCP
port: 3000
nodePort: 30090
Your Ingress file should look like this:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: webapp-ingress
spec:
rules:
- host: kubernetes.docker.internal
http:
paths:
- path: /
backend:
serviceName: webapp-service
servicePort: http
Then you are able to connect to app using http://kubernetes.docker.internal/.
Example you can see here: wsl2-docker-for-desktop.
I used the Docker-Desktop version to install the nginx-ingress controller
https://kubernetes.github.io/ingress-nginx/deploy/#docker-desktop
curl http://kubernetes.docker.internal/
Offcourse I've not installed any workload yet but the default ingress controller works just fine.
With Kustomize you can simply use
helmCharts:
- name: ingress-nginx
releaseName: ingress-nginx
repo: https://kubernetes.github.io/ingress-nginx
This is just to point out that Amel Mahmuzićs comment is still valid with a recent (I used the ingress-nginx Helm Chart 4.4.2) ingress deployment.
I could not get this to work for far too long (I tried to follow the Strapi fodadvisor example with Docker Desktop build in Kubernetes instead of minikube) and always received a 404 from the ingress.
However, after using this yaml with the added annotation
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: main-ingress
annotations:
kubernetes.io/ingress.class: "nginx"
spec:
rules:
- host: foodadvisor.backend
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: foodadvisor-backend
port:
number: 1337
- host: foodadvisor.client
http:
paths:
- path: /
pathType: Prefix
backend:
service:
name: foodadvisor-frontend
port:
number: 3000
it worked immediately. The K82 docs mention, that this annotation is deprecated.

How to set HTTPS as default on GKE Ingress-gce

I currently have a working Frontend and Backend nodeports with an Ingress service setup with GKE's Google-managed certificates.
However, my issue is that by default when a user goes to samplesite.com, it uses http as default. This means that the user needs to specifically type in the browser https://samplesite.com in order to get the https version of my website.
How do I properly disable http on GKE ingress, or how do I redirect all my traffic to https? I understand that this can be forcefully done in my backend code as well but I want to separate concerns and handle this in my Kubernetes setup.
Here is my ingress.yaml file:
kind: Service
apiVersion: v1
metadata:
name: frontend-node-service
namespace: default
spec:
type: NodePort
selector:
app: frontend
ports:
- port: 5000
targetPort: 80
protocol: TCP
name: http
---
kind: Service
apiVersion: v1
metadata:
name: backend-node-service
namespace: default
spec:
type: NodePort
selector:
app: backend
ports:
- port: 8081
targetPort: 9229
protocol: TCP
name: http
---
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: samplesite-ingress-frontend
namespace: default
annotations:
kubernetes.io/ingress.global-static-ip-name: "samplesite-static-ip"
kubernetes.io/ingress.allow-http: "false"
networking.gke.io/managed-certificates: samplesite-ssl
spec:
backend:
serviceName: frontend-node-service
servicePort: 5000
---
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: samplesite-ingress-backend
namespace: default
annotations:
kubernetes.io/ingress.global-static-ip-name: "samplesite-backend-ip"
kubernetes.io/ingress.allow-http: "false"
networking.gke.io/managed-certificates: samplesite-api-ssl
spec:
backend:
serviceName: backend-node-service
servicePort: 8081
Currently GKE Ingress does not support out of the box HTTP->HTTPS redirect.
There is an ongoing Feature Request for it here:
Issuetracker.google.com: Issues: Redirect all HTTP traffic to HTTPS when using the HTTP(S) Load Balancer
There are some workarounds for it:
Use different Ingress controller like nginx-ingress.
Create a HTTP->HTTPS redirection in GCP Cloud Console.
How do I properly disable http on GKE ingress, or how do I redirect all my traffic to https?
To disable HTTP on GKE you can use following annotation:
kubernetes.io/ingress.allow-http: "false"
This annotation will:
Allow traffic only on port: 443 (HTTPS).
Deny traffic on port: 80 (HTTP) resulting in error code: 404.
Focusing on previously mentioned workarounds:
Use different Ingress controller like nginx-ingress
One of the ways to have the HTTP->HTTPS redirection is to use nginx-ingress. You can deploy it with official documentation:
Kubernetes.github.io: Ingress-nginx: Deploy: GCE-GKE
This Ingress controller will create a service of type LoadBalancer which will be the entry point for your traffic. Ingress objects will respond on LoadBalancer IP. You can download the manifest from installation part and modify it to support the static IP you have requested in GCP. More reference can be found here:
Stackoverflow.com: How to specify static IP address for Kubernetes load balancer?
You will need to provide your own certificates or use tools like cert-manager to have HTTPS traffic as the annotation: networking.gke.io/managed-certificates will not work with nginx-ingress.
I used this YAML definition and without any other annotations I was always redirected to the HTTPS:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: nginx-ingress
annotations:
kubernetes.io/ingress.class: "nginx" # IMPORTANT
spec:
tls: # HTTPS PART
- secretName: ssl-certificate # SELF PROVIDED CERT NAME
rules:
- host:
http:
paths:
- path: /
backend:
serviceName: hello-service
servicePort: hello-port
Create a HTTP->HTTPS redirection in GCP Cloud Console.
There is also an option to manually create a redirection rule for your Ingress resource. You will need to follow official documentation:
Cloud.google.com: Load Balancing: Docs: HTTPS: Setting up HTTP -> HTTPS Redirect
Using the part of above documentation, you will need to create a HTTP LoadBalancer responding on the same IP as your Ingress resource (reserved static IP) redirecting traffic to HTTPS.
Disclaimer!
Your Ingress resource will need to have following annotation:
kubernetes.io/ingress.allow-http: "false"
Lack there of will result in forbidding you to create a redirection mentioned above.

Empty Address on Docker Desktop kubernates for Ingress

k8 ingress yaml which is used to deploy ingress in docker desktop k8 but not working address is always empty any one please help me on this
$ kubectl get ingress springboot-ingress
NAME HOSTS ADDRESS PORTS AGE
springboot-ingress espark.com,localhost 80 12m
working code git url
https://github.com/adarshkumarsingh83/kubernetes/tree/master/springboot-kubernetes-ingress-lb
i have used below url
$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.30.0/deploy/static/mandatory.yaml
$ kubectl apply -f https://raw.githubusercontent.com/kubernetes/ingress-nginx/nginx-0.30.0/deploy/static/provider/cloud-generic.yaml
$ kubectl apply -f $(pwd)/kubernates/ingress.yaml
and change the ingress yaml one line and it worked for me
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: springboot-ingress
spec:
rules:
- host: espark.com
http:
paths:
- path: /v1/api/address
backend:
serviceName: espark-address-service
servicePort: 8080
- path: /v1/api/employee
backend:
serviceName: espark-employee-service
servicePort: 8080
- host: localhost
http:
paths:
- path: /v1/api/address
backend:
serviceName: espark-address-service
servicePort: 8080
- path: /v1/api/employee
backend:
serviceName: espark-employee-service
servicePort: 8080
Check if endpoint is generated for your service by kubectl get endpoints and verify it has IP. If not, check the selectors and port in your service resource, they should match at least one running pod, otherwise what you see above will happen.

Swagger UI try it out internally in kubernetes

i have deployed swagger UI on Kubernetes. now it's not sending a request to internal service of Kubernetes when clicking on the Try it out button.
Since all service running locally in Kubernetes we have to use HTTP but my swagger UI is on HTTPS so getting mixed content error also.
is there any way we can invoke internal service using swagger UI running inside Kubernetes.
this is my demo swagger.yaml :
openapi: 3.0.1
servers:
- url: '{scheme}://test-service'
variables:
scheme:
description: 'The Data Set API is accessible via https and http'
enum:
- 'https'
- 'http'
default: 'https'
info:
description: >-
i would rather suggest using ingress and add further rule with https domain.
ingress :
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
annotations:
cert-manager.io/cluster-issuer: swagger-staging
kubernetes.io/ingress.class: nginx
nginx.ingress.kubernetes.io/rewrite-target: /$2
name: swagger-ingress
namespace: default
spec:
rules:
- host: example.com
http:
paths:
- path: /test-service(/|$)(.*)
backend:
serviceName: service-1
servicePort: 80
- path: service-2(/|$)(.*)
backend:
serviceName: service-2
servicePort: 80
- path: /service-3(/|$)(.*)
backend:
serviceName: service-3
servicePort: 80
- path: /service-4(/|$)(.*)
backend:
serviceName: service-4
servicePort: 80
- path: /service-5(/|$)(.*)
backend:
serviceName: service-5
servicePort: 80
note : if you will try updating ingress with https and later try with port-forward it will not work and same give error of browser mixed content .
You can use port-forwarding:
kubectl -n <namespace> port-forward svc/<your-swagger-service> <localhost-port>:<swagger-port-in-your-svc>
And then go to localhost:<localhost-port>
Another way to that is using internal load balancer there's some options depends on your cloud provider.

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