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https://github.com/angudadevops/istio-k8s

Istio Configuration with Sample K8s Application
https://github.com/angudadevops/istio-k8s

istio-conf istio-demo istio-example istio-install istio-k8s istio-k8s-sample istio-sample istio-services istio-setup istio-web

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Istio Configuration with Sample K8s Application

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# istio-k8s



Istio Configuration with Sample K8s Application 



## Istio Setup with Application 



Run the below script, it will help to install istion on your cluster 



```

$ sudo bash istio.sh

```



## Istio Installation



### Download Istio 



First download the istio on your machine with below command 

```

$ curl -L https://istio.io/downloadIstio | ISTIO_VERSION=1.7.1 TARGET_ARCH=x86_64 sh - 

```



Add the istioctl client to your path (Linux or macOS):

```

export PATH=$PWD/istio-1.7.1/bin:$PATH

```

### Install Istio



Run the below command to install the istio on your cluster with demo profile

`NOTE:` Demo Profile for testing, but there are other profiles for production or performance testing.



```

$ istioctl install --set profile=demo

```



Add a namespace label to instruct Istio to automatically inject Envoy sidecar proxies when you deploy your application later:



```

$ kubectl label namespace default istio-injection=enabled

```



## Deploy the Application



Python web application architecture 



![python-web-application](istio-python-example.png)



Run the below command to install the python web application on your kubernetes cluster 



```

$ git clone https://github.com/angudadevops/istio-k8s.git



$ kubectl apply -f deployment.yaml

```



Above command will deploy the python web application wiht its service 



First install the gateway that will help to connect istio ingress 



```

$ kubectl apply -f gateway/python-gateway.yaml

```



Now install the destination rule to map the specific version as a subest



```

$ kubectl apply -f destination-rule/python-destination-rule.yaml

```



## Deploy Istio Rules 



Now it's time to descide what type of virtual service type you want to use, below are the available methods



- HTTP Based Routing 

- Weight Based routing 

- Fault Injection Routing



1. HTTP Based Routing 



Run the below command to install Http based routing with prefix and rewrite rules



```

$ kubectl apply -f virtual-service/python-http-prefix.yaml

```



2. Weight Based Routing 



Run the below command to install weight based routing, this method is for Blue Green or Canary based deployments



```

$ kubectl apply -f virtual-service/python-weight-based.yaml

```



3. Fault Injection Routing 



It's best practice to add fault injection for any application, as this will help you to wait and reroute the request to different prefix. 



```

$ kubectl apply -f virtual-service/python-fault-injection.yaml

```



## Access the Application 



First get the istion-ingress gateway node port to access the application



Run the below command to check the node port of the ingress gateway, you should see something like below

```

$ kubectl get svc -n istio-system | grep istio-ingressgateway

istio-ingressgateway        NodePort    10.110.12.112           15021:32029/TCP,80:30144/TCP,443:32186/TCP,31400:30469/TCP,15443:30433/TCP

```



Access the web application with your host IP and Node Port 



```

http://:/

```

1. HTTP Based Routing 



Access the application with above url with context path as either `/v1 or /v2`. You should see the difference 



2. Weight Based Routing 



Access the application with context path as `/app`, you should see weight is distrubuted 50/50 to v1/v2 app versions 



3. Fault Injection Routing 



Access the application without context path, then it will reroute the request to `v2` version application