To see current gateways and their ips with ports,
# kubectl get svc
istio-ingressgateway -n istio-system
Below is the network traffic plan for the application via
istio-system,
Client/Browser à
http://<Istio ingressgateway External IP> :< gateway port>/<application
URL> à Gateway
(istio) à
VirtualService(istio) à
Service(k8s) à
Deployment(Pods)
First we need to apply our deployment,
Below is a basic deployment.yaml file content,
apiVersion: apps/v1
kind: Deployment
metadata:
name: test
labels:
app: test
spec:
replicas: 1
selector:
matchLabels:
app: test
template:
metadata:
labels:
app: test
version: v1
spec:
containers:
- name: test
image: <image location>test:latest
ports:
- name: test
containerPort: 80 # this is the
application port exposing via pod
Use below command to apply the deployment,
# kubectl.exe deploy -f <your deployement
file>.yml
Now you need to apply service.yaml to create a service with
clusterIP,
apiVersion: v1
kind: Service
metadata:
name: test
labels:
app: test
spec:
ports:
- name: http
protocol: TCP
port: 80
selector:
app: test
Use below command to apply the service,
# kubectl.exe deploy -f <your service
file>.yml
Now you need to create virtualservice to send the traffic to
the service created above,
apiVersion: networking.istio.io/v1alpha3
kind: VirtualService
metadata:
name: test
spec:
hosts:
- "*"
gateways:
- test-gateway #this is the
gateway referring to get the traffic
http:
- match:
- uri:
exact: /test-service/getall
- uri:
exact: /login
- uri:
exact: /logout
route:
- destination:
host: test
port:
number: 80
Use below command to apply the virtual service,
# kubectl.exe deploy -f <your virtual service
file>.yml
Finally you need to create a gateway to get the traffic from
outside world to send the traffic between virtual services,
apiVersion: networking.istio.io/v1alpha3
kind: Gateway
metadata:
name: test-gateway
spec:
selector:
istio: ingressgateway # this is the default
selector
servers:
- port:
number: 80
name: http
protocol: HTTP
hosts:
- "*"
That’s it. Now you have ingress traffic path to your
application cluster.
Use below commands to check created resources,
# kubectl.exe get deployments
# kubectl.exe get services
# kubectl.exe get virtualservices
# kubectl.exe get gateways
Now you can access created application using
istio-ingressgateway exteranal IP,
http://<Istio ingressgateway External IP> :<
gateway port>/<application URL>
Ex. According to above sample deployments,
http:// ://<Istio ingressgateway External IP> :80/test-service/getall
