I have try to expose my micro-service to the internet with aws ec2. Using the deployment and service yaml file under below.
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-app
spec:
replicas: 1
selector:
matchLabels:
app: my-app
strategy: {}
template:
metadata:
labels:
app: my-app
spec:
dnsPolicy: ClusterFirstWithHostNet
hostNetwork: true
containers:
- name: my-app
image: XXX
ports:
- name: my-app
containerPort: 3000
resources: {}
---
apiVersion: v1
kind: Service
metadata:
name: my-app
spec:
selector:
app: my-app
ports:
- name: my-app
nodePort: 32000
port: 3000
targetPort: 3000
type: NodePort
And also create a ingress resource.
apiVersion: networking.k8s.io/v1beta1
kind: Ingress
metadata:
name: app-ingress
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /
spec:
rules:
- host: example.myApp.com
http:
paths:
- path: /my-app
backend:
serviceName: my-app
servicePort: 80
The last step I open the 80 port in aws dashboard, how should I choice the ingress controller to realize my intend?
servicePort should be 3000, the same as port in your service object.
Note however that, setting up cluster with kubeadm on AWS is not the best way to go: EKS provides you optimized, well configured clusters with external load-balancers and ingress controllers.
Related
I have a kubernetes ingress controller terminating my ssl with an ingress resource handling two routes: 1 my frontend SPA app, and the second backend api. Currently when I hit each frontend and backend service directly they perform flawlessly, but when I call the ingress controller both frontend and backend services alternate between producing the correct result and a 502 Bad Gateway.
To me it smells like my ingress resource is having some sort of path conflict that I'm not sure how to debug.
Reddit suggested that it could be a label and selector mismatch between my services and deployments which I believe I checked thoroughly. they also mentioned: "api layer deployment and a worker layer deployment [that] both share a common app label and your PDB selects that app label with a 50% availability for example". Which I haven't run down because I don't quite understand.
I also realize SSL could play a role in gateway issues; However, my certificates appear to be working when I hit the https:// port of the ingress-controller
frontend-deploy:
apiVersion: apps/v1
kind: Deployment
metadata:
name: frontend
namespace: ingress-nginx
spec:
selector:
matchLabels:
app: my-performance-front
tier: frontend
replicas: 1
template:
metadata:
labels:
app: my-performance-front
tier: frontend
spec:
containers:
- name: my-performance-frontend
image: "<my current image and location>"
lifecycle:
preStop:
exec:
command: ["/usr/sbin/nginx","-s","quit"]
imagePullSecrets:
- name: regcred
frontend-svc
apiVersion: v1
kind: Service
metadata:
name: frontend
namespace: ingress-nginx
spec:
selector:
app: my-performance-front
tier: frontend
ports:
- protocol: TCP
port: 80
targetPort: 80
type: LoadBalancer
backend-deploy
apiVersion: apps/v1
kind: Deployment
metadata:
name: backend
namespace: ingress-nginx
spec:
selector:
matchLabels:
app: my-performance-back
tier: backend
replicas: 1
template:
metadata:
labels:
app: my-performance-back
tier: backend
spec:
containers:
- name: my-performance-backend
image: "<my current image and location>"
lifecycle:
preStop:
exec:
command: ["/usr/sbin/nginx","-s","quit"]
imagePullSecrets:
- name: regcred
backend-svc
apiVersion: v1
kind: Service
metadata:
name: backend
namespace: ingress-nginx
spec:
selector:
app: my-performance-back
tier: backend
ports:
- protocol: TCP
name: "http"
port: 80
targetPort: 8080
type: LoadBalancer
ingress-rules
apiVersion: networking.k8s.io/v1
kind: Ingress
metadata:
name: ingress-rules
namespace: ingress-nginx
annotations:
nginx.ingress.kubernetes.io/rewrite-target: "/$1"
# nginx.ingress.kubernetes.io/service-upstream: "true"
spec:
rules:
- http:
paths:
- path: /(api/v0(?:/|$).*)
pathType: Prefix
backend:
service:
name: backend
port:
number: 80
- path: /(.*)
pathType: Prefix
backend:
service:
name: frontend
port:
number: 80
Any ideas, critiques, or experiences are welcomed and appreciated!!!
I`m trying to apply NLB sticky session on a EKS environment.
There are 2 worker nodes(EC2) connected to NLB target group, each node has 2 nginx pods.
I wanna connect to same pod on my local system for testing.
But it looks like connected different pod every trying using 'curl' command.
this is my test yaml file and test command.
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: udptest
labels:
app: nginx
spec:
replicas: 2
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: container
image: nginx
ports:
- containerPort: 80
nodeSelector:
zone: a
---
apiVersion: apps/v1
kind: ReplicaSet
metadata:
name: udptest2
labels:
app: nginx
spec:
replicas: 2
selector:
matchLabels:
app: nginx
template:
metadata:
labels:
app: nginx
spec:
containers:
- name: container
image: nginx
ports:
- containerPort: 80
nodeSelector:
zone: c
---
apiVersion: v1
kind: Service
metadata:
name: nginx-nlb
annotations:
service.beta.kubernetes.io/aws-load-balancer-type: "nlb"
spec:
selector:
app: nginx
ports:
- protocol: TCP
port: 80
targetPort: 80
type: LoadBalancer
#!/bin/bash
number=0
while :
do
if [ $number -gt 2 ]; then
break
fi
curl -L -k -s -o /dev/null -w "%{http_code}\n" <nlb dns name>
done
How can i connect to specific pod by NLB`s sticy session every attempt?
As much as i understand ClientIP value for sessionAffinity is not supported when the service type is LoadBalancer.
You can use the Nginx ingress controller and implement the affinity over there.
https://kubernetes.github.io/ingress-nginx/examples/affinity/cookie/
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: test-ingress
annotations:
kubernetes.io/ingress.class: "nginx"
nginx.ingress.kubernetes.io/affinity: "cookie"
nginx.ingress.kubernetes.io/session-cookie-name: "test-cookie"
nginx.ingress.kubernetes.io/session-cookie-expires: "172800"
nginx.ingress.kubernetes.io/session-cookie-max-age: "172800"
nginx.ingress.kubernetes.io/ssl-redirect: "false"
nginx.ingress.kubernetes.io/affinity-mode: persistent
nginx.ingress.kubernetes.io/session-cookie-hash: sha1
spec:
rules:
- host: example.com
http:
paths:
- path: /
backend:
serviceName: service
servicePort: port
Good article : https://zhimin-wen.medium.com/sticky-sessions-in-kubernetes-56eb0e8f257d
You need to enable it:
annotations:
service.beta.kubernetes.io/aws-load-balancer-type: "nlb"
service.beta.kubernetes.io/aws-load-balancer-target-group-attributes: stickiness.enabled=true,stickiness.type=source_ip
I have set up k8s cluster in AWS ec2 instances with 1 parent and 2 child nodes using kops.
Deployed 2 services and running with LoadBalancer service type in browser.
Now I installed NGINX but through LB ip not able to hit my service. It is giving 504 GATEWAY_TIME_OUT exception. Googled it but no success, Where am I going wrong? Here is my sample code...[AWS FREE ACCOUNT]
deployment.yml
apiVersion: apps/v1
kind: Deployment
metadata:
labels:
app: $APP_NAME
name: $APP_NAME
namespace: $NAMESPACE
spec:
replicas: 1
selector:
matchLabels:
app: $APP_NAME
template:
metadata:
labels:
app: $APP_NAME
spec:
imagePullSecrets:
- name: $IMG_PULL_SECRET
containers:
- image: $IMAGE_REG/$APP_NAME:$IMAGE_TAG
name: $APP_NAME
imagePullPolicy: Always
ports:
- containerPort: ${CONTAINER_PORT}
protocol: TCP
env:
- name: spring.cloud.config.uri
value: 'http://config-server-service'
service.yml
apiVersion: v1
kind: Service
metadata:
labels:
app: $APP_NAME
name: $APP_NAME
namespace: $NAMESPACE
spec:
type: $SERVICE_TYPE
#type: $SERVICE_TYPE
ports:
- port: 80
targetPort: ${CONTAINER_PORT}
protocol: TCP
selector:
app: $APP_NAME
ingress.yml
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: ${APP_NAME}
namespace: $NAMESPACE
annotations:
nginx.ingress.kubernetes.io/rewrite-target: /
nginx.ingress.kubernetes.io/affinity: cookie
nginx.ingress.kubernetes.io/session-cookie-name: JSESSIONID
nginx.ingress.kubernetes.io/ssl-passthrough: "false"
nginx.ingress.kubernetes.io/ssl-redirect: "false"
kubernetes.io/ingress.class: "nginx"
kubernetes.io/ingress.allow-http: "true"
# kubernetes.io/ingress.global-static-ip-name: "my-gateway"
spec:
rules:
- http:
paths:
- path: /${APP_NAME}
backend:
serviceName: ${APP_NAME}
servicePort: 80
I was looking for how to use cookie affinity in GKE, using Ingress for that.
I've found the following link to do it: https://cloud.google.com/kubernetes-engine/docs/how-to/configure-backend-service
I've created a yaml with the following:
---
apiVersion: apps/v1
kind: Deployment
metadata:
name: my-bsc-deployment
spec:
selector:
matchLabels:
purpose: bsc-config-demo
replicas: 3
template:
metadata:
labels:
purpose: bsc-config-demo
spec:
containers:
- name: hello-app-container
image: gcr.io/google-samples/hello-app:1.0
---
apiVersion: cloud.google.com/v1beta1
kind: BackendConfig
metadata:
name: my-bsc-backendconfig
spec:
timeoutSec: 40
connectionDraining:
drainingTimeoutSec: 60
sessionAffinity:
affinityType: "GENERATED_COOKIE"
affinityCookieTtlSec: 50
---
apiVersion: v1
kind: Service
metadata:
name: my-bsc-service
labels:
purpose: bsc-config-demo
annotations:
beta.cloud.google.com/backend-config: '{"ports": {"80":"my-bsc-backendconfig"}}'
spec:
type: NodePort
selector:
purpose: bsc-config-demo
ports:
- port: 80
protocol: TCP
targetPort: 8080
---
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: my-bsc-ingress
spec:
rules:
- http:
paths:
- path: /*
backend:
serviceName: my-bsc-service
servicePort: 80
---
Everything seems to go well. When I inspect the created Ingress I see 2 backend services. One of them has the cookie configured, but the other doesn't.
If I create the deployment, and from GCP's console, create the Service and Ingress, only one backend service appears.
Somebody knows why using a yaml I get 2, but doing it from console I only get one?
Thanks in advance
Oscar
Your definition is good.
The reason you have two backend's is because your ingress does not define a default backend. GCE LB require a default backend so during LB creation, a second backend is added to the LB to act as the default (this backend does nothing but serve 404 responses). The default backend does not use the backendConfig.
This shouldn't be a problem, but if you want to ensure only your backend is used, define a default backend value in your ingress definition by adding the spec.backend:
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: my-bsc-ingress
spec:
backend:
serviceName: my-bsc-service
servicePort: 80
rules:
- http:
paths:
- path: /*
backend:
serviceName: my-bsc-service
servicePort: 80
But, like I said, you don't NEED to define this, the additional backend won't really come into play and no sessions affinity is required (there is only a single pod anyway). If you are curious, the default backend pod in question is called l7-default-backend-[replicaSet_hash]-[pod_hash] in the kube-system namespace
You can enable the cookies on the ingress like
apiVersion: extensions/v1beta1
kind: Ingress
metadata:
name: ingress-sticky
annotations:
nginx.ingress.kubernetes.io/affinity: "cookie"
nginx.ingress.kubernetes.io/session-cookie-name: "route"
nginx.ingress.kubernetes.io/session-cookie-expires: "172800"
nginx.ingress.kubernetes.io/session-cookie-max-age: "172800"
spec:
rules:
- host: ingress.example.com
http:
paths:
- backend:
serviceName: http-svc
servicePort: 80
path: /
You can create the service like :
kind: Service
apiVersion: v1
metadata:
name: my-service
spec:
selector:
app: my-app
ports:
- name: http
protocol: TCP
port: 80
targetPort: 80
sessionAffinity: ClientIP
If you are using the traefik ingress instead of the nginx and deault GKe ingress you can write the service like this
apiVersion: v1
kind: Service
metadata:
name: session-affinity
labels:
app: session-affinity
annotations:
traefik.ingress.kubernetes.io/affinity: "true"
traefik.ingress.kubernetes.io/session-cookie-name: "sticky"
spec:
type: NodePort
ports:
- port: 8080
targetPort: 8080
protocol: TCP
name: http
selector:
app: session-affinity-demo
I’ve the following application which Im able to run in K8S successfully which using service with type load balancer, very simple app with two routes
/ - you should see 'hello application`
/api/books should provide list of book in json format
This is the service
apiVersion: v1
kind: Service
metadata:
name: go-ms
labels:
app: go-ms
tier: service
spec:
type: LoadBalancer
ports:
- port: 8080
selector:
app: go-ms
This is the deployment
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: go-ms
labels:
app: go-ms
spec:
replicas: 2
template:
metadata:
labels:
app: go-ms
tier: service
spec:
containers:
- name: go-ms
image: rayndockder/http:0.0.2
ports:
- containerPort: 8080
env:
- name: PORT
value: "8080"
resources:
requests:
memory: "64Mi"
cpu: "125m"
limits:
memory: "128Mi"
cpu: "250m"
after applied the both yamls and when calling the URL:
http://b0751-1302075110.eu-central-1.elb.amazonaws.com/api/books
I was able to see the data in the browser as expected and also for the root app using just the external ip
Now I want to use istio, so I follow the guide and install it successfully via helm
using https://istio.io/docs/setup/kubernetes/install/helm/ and verify that all the 53 crd are there and also istio-system
components (such as istio-ingressgateway
istio-pilot etc all 8 deployments are in up and running)
I’ve change the service above from LoadBalancer to NodePort
and create the following istio config according to the istio docs
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
name: http-gateway
spec:
selector:
istio: ingressgateway
servers:
- port:
number: 8080
name: http
protocol: HTTP
hosts:
- "*"
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: virtualservice
spec:
hosts:
- "*"
gateways:
- http-gateway
http:
- match:
- uri:
prefix: "/"
- uri:
exact: "/api/books"
route:
- destination:
port:
number: 8080
host: go-ms
in addition I’ve added the following
kubectl label namespace books istio-injection=enabled where the application is deployed,
Now to get the external Ip i've used command
kubectl get svc -n istio-system -l istio=ingressgateway
and get this in the external-ip
b0751-1302075110.eu-central-1.elb.amazonaws.com
when trying to access to the URL
http://b0751-1302075110.eu-central-1.elb.amazonaws.com/api/books
I got error:
This site can’t be reached
ERR_CONNECTION_TIMED_OUT
if I run the docker rayndockder/http:0.0.2 via
docker run -it -p 8080:8080 httpv2
I path's works correctly!
Any idea/hint What could be the issue ?
Is there a way to trace the istio configs to see whether if something is missing or we have some collusion with port or network policy maybe ?
btw, the deployment and service can run on each cluster for testing of someone could help...
if I change all to port to 80 (in all yaml files and the application and the docker ) I was able to get the data for the root path, but not for "api/books"
I tired your config with the modification of gateway port to 80 from 8080 in my local minikube setup of kubernetes and istio. This is the command I used:
kubectl apply -f - <<EOF
apiVersion: v1
kind: Service
metadata:
name: go-ms
labels:
app: go-ms
tier: service
spec:
ports:
- port: 8080
selector:
app: go-ms
---
apiVersion: extensions/v1beta1
kind: Deployment
metadata:
name: go-ms
labels:
app: go-ms
spec:
replicas: 2
template:
metadata:
labels:
app: go-ms
tier: service
spec:
containers:
- name: go-ms
image: rayndockder/http:0.0.2
ports:
- containerPort: 8080
env:
- name: PORT
value: "8080"
resources:
requests:
memory: "64Mi"
cpu: "125m"
limits:
memory: "128Mi"
cpu: "250m"
---
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
name: http-gateway
spec:
selector:
istio: ingressgateway
servers:
- port:
number: 80
name: http
protocol: HTTP
hosts:
- "*"
---
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: go-ms-virtualservice
spec:
hosts:
- "*"
gateways:
- http-gateway
http:
- match:
- uri:
prefix: /
- uri:
exact: /api/books
route:
- destination:
port:
number: 8080
host: go-ms
EOF
The reason that I changed the gateway port to 80 is that, the istio ingress gateway by default opens up a few ports such as 80, 443 and few others. In my case, as minikube doesn't have an external load balancer, I used node ports which is 31380 in my case.
I was able to access the app with url of http://$(minikube ip):31380.
There is no point in changing the port of services, deployments since these are application specific.
May be this question specifies the ports opened by istio ingress gateway.