Temporal organization
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savagebidoof
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apiVersion: v1
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kind: Namespace
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metadata:
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name: istio-ingress
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labels:
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istio-injection: "enabled"
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---
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196
09-Ingress/01-Create-Istio-LoadBalancer/README.md
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196
09-Ingress/01-Create-Istio-LoadBalancer/README.md
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---
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gitea: none
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include_toc: true
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---
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# Based on
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- [01-hello_world_1_service_1_deployment](../../01-Getting%20Started/01-hello_world_1_service_1_deployment)
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# Description
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On this example, a new Istio Ingress Load Balancer is deployed.
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The previous example has been modified to utilize the Ingress resource just deployed.
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# Changelog
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## Gateway
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```yaml
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apiVersion: networking.istio.io/v1alpha3
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kind: Gateway
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metadata:
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name: helloworld-gateway
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spec:
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selector:
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istio: myingressgateway # use istio default controller
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servers:
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- port:
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number: 80
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name: http
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protocol: HTTP
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hosts:
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- "*"
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```
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The selector `Istio` has been updated to `myingressgateway`, to match the selector of the Istio Ingress Load Balancer that will be created.
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## Namespace
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```yaml
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apiVersion: v1
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kind: Namespace
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metadata:
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name: istio-ingress
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labels:
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istio-injection: "enabled"
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```
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The namespace `istio-ingress` will have the label `istio-injection` with the contents set to `enabled` to allow Istio to automatically inject the Istio sidecars to the resources within that namespace, unless specified otherwise.
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## IstioOperator
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```yaml
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apiVersion: install.istio.io/v1alpha1
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kind: IstioOperator
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metadata:
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name: ingress
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spec:
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profile: empty # Do not install CRDs or the control plane
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components:
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ingressGateways:
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- name: myistio-ingressgateway
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namespace: istio-ingress
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enabled: true
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label:
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# Set a unique label for the gateway. This is required to ensure Gateways
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# can select this workload
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istio: myingressgateway
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values:
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gateways:
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istio-ingressgateway:
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# Enable gateway injection
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injectionTemplate: gateway
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```
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The following configuration will create an Istio Ingress Load Balancer named `myistio-ingressgateway`, located at the namespace `istio-ingress`.
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The label `istio`, refers to the selector that the `Gateway` resources will use to specify the targeted Istio resource.
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# Walkthrough
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## Deploy resources
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### Create namespace
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```shell
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kubectl apply -f 01-namespace.yaml
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```
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```text
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namespace/istio-ingress created
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```
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### Create / Install the Istio Ingress resource
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```shell
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istioctl install -f ingress.yaml
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```
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```text
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This will install the Istio 1.17.2 empty profile into the cluster. Proceed? (y/N) y
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✔ Ingress gateways installed
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✔ Installation complete
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Thank you for installing Istio 1.17. Please take a few minutes to tell us about your install/upgrade experience! https://forms.gle/hMHGiwZHPU7UQRWe9
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```
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### Deploy gateway
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```shell
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kubectl apply -f gateway.yaml
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```
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```text
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gateway.networking.istio.io/helloworld-gateway created
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virtualservice.networking.istio.io/helloworld-vs created
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```
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### Deploy deployment
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```shell
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kubectl apply -f deployment-nomtls.yaml
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```
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```text
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service/helloworld created
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deployment.apps/helloworld-nginx created
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```
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## Testing deployment
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### Get Load Balancer IP
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```shell
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kubectl get svc -n istio-ingress
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```
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```text
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NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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myistio-ingressgateway LoadBalancer 10.102.158.128 192.168.1.51 15021:31181/TCP,80:30090/TCP,443:31285/TCP 5m10s
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```
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### Curl
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The request results in status code `200`, meaning a correct handling of the request.
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```shell
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curl 192.168.1.51/helloworld -I
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```
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```text
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HTTP/1.1 200 OK
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server: istio-envoy
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date: Sun, 23 Apr 2023 06:40:57 GMT
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content-type: text/html
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content-length: 615
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last-modified: Tue, 28 Mar 2023 15:01:54 GMT
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etag: "64230162-267"
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accept-ranges: bytes
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x-envoy-upstream-service-time: 15
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```
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# Cleanup
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[Yeah no idea, gl with that.](https://stackoverflow.com/a/55731730)
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```shell
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kubectl delete -f ./deployment-nomtls.yaml
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kubectl delete -f ./gateway.yaml
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```
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```text
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service "helloworld" deleted
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deployment.apps "helloworld-nginx" deleted
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gateway.networking.istio.io "helloworld-gateway" deleted
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virtualservice.networking.istio.io "helloworld-vs" deleted
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```
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```shell
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istioctl uninstall --purge
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```
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Also read that "just removing" the namespace works to purge the config/remove resources.
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Meanwhile, I did that (and seems like it performed correctly), I am not entirely sure about it. I'm not bothered myself as the environment where I am performing the tests is intended to be destroyed anytime and recreated, yet in a production environment I am not sure how this would need to be approached.
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Maybe with a `kubectl get all -A` and through `grep` and `less` find resources and configurations, and delete them manually.
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```shell
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kubectl delete namespace istio-ingress
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```
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# Troubleshooting
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## curl: (7) Failed to connect to 192.168.1.51 port 80 after 2 ms: Couldn't connect to server
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Ensure that the gateway is using the correct `selector` to target the Istio Ingress Load Balancer created.
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# Links of interest
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- https://istio.io/latest/docs/setup/additional-setup/gateway/#deploying-a-gateway
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48
09-Ingress/01-Create-Istio-LoadBalancer/deployment.yaml
Executable file
48
09-Ingress/01-Create-Istio-LoadBalancer/deployment.yaml
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@ -0,0 +1,48 @@
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# https://github.com/istio/istio/blob/master/samples/helloworld/helloworld.yaml
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apiVersion: v1
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kind: Service
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metadata:
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name: helloworld
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labels:
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app: helloworld
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service: helloworld
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spec:
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ports:
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- port: 80
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name: http
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selector:
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app: helloworld
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---
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#apiVersion: v1
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#kind: ServiceAccount
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#metadata:
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# name: istio-helloworld
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# labels:
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# account:
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---
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apiVersion: apps/v1
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kind: Deployment
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metadata:
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name: helloworld-nginx
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labels:
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app: helloworld
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spec:
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replicas: 1
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selector:
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matchLabels:
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app: helloworld
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template:
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metadata:
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labels:
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app: helloworld
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spec:
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# serviceAccountName: istio-helloworld
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containers:
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- name: helloworld
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image: nginx
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resources:
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requests:
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cpu: "100m"
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imagePullPolicy: IfNotPresent #Always
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ports:
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- containerPort: 80
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36
09-Ingress/01-Create-Istio-LoadBalancer/gateway.yaml
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36
09-Ingress/01-Create-Istio-LoadBalancer/gateway.yaml
Executable file
@ -0,0 +1,36 @@
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# https://github.com/istio/istio/blob/master/samples/helloworld/helloworld-gateway.yaml
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apiVersion: networking.istio.io/v1alpha3
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kind: Gateway
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metadata:
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name: helloworld-gateway
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spec:
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selector:
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istio: myingressgateway # use istio default controller
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servers:
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- port:
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number: 80
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name: http
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protocol: HTTP
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hosts:
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- "*"
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---
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apiVersion: networking.istio.io/v1alpha3
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kind: VirtualService
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metadata:
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name: helloworld-vs
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spec:
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hosts:
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- "*"
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gateways:
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- helloworld-gateway
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http:
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- match:
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- uri:
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exact: /helloworld
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route:
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- destination:
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host: helloworld
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port:
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number: 80
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rewrite:
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uri: "/"
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20
09-Ingress/01-Create-Istio-LoadBalancer/ingress.yaml
Normal file
20
09-Ingress/01-Create-Istio-LoadBalancer/ingress.yaml
Normal file
@ -0,0 +1,20 @@
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apiVersion: install.istio.io/v1alpha1
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kind: IstioOperator
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metadata:
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name: ingress
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spec:
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profile: empty # Do not install CRDs or the control plane
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components:
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ingressGateways:
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- name: myistio-ingressgateway
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namespace: istio-ingress
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enabled: true
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label:
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# Set a unique label for the gateway. This is required to ensure Gateways
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# can select this workload
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istio: myingressgateway
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values:
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gateways:
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istio-ingressgateway:
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# Enable gateway injection
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injectionTemplate: gateway
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