istio wip

2025-06-06 17:01:30 +00:00 · 2020-10-21 11:53:01 +11:00 · 2020-10-21 11:53:01 +11:00 · 28b9def878
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+# Introduction to Istio
+
+## We need a Kubernetes cluster
+
+Lets create a Kubernetes cluster to play with using [kind](https://kind.sigs.k8s.io/docs/user/quick-start/)
+
+```
+kind create cluster --name istio --image kindest/node:v1.19.1
+```
+
+## Deploy our microservices (Video catalog)
+
+```
+# ingress controller
+kubectl create ns ingress-nginx
+kubectl apply -f kubernetes/servicemesh/applications/ingress-nginx/
+
+# applications
+kubectl apply -f kubernetes/servicemesh/applications/playlists-api/
+kubectl apply -f kubernetes/servicemesh/applications/playlists-db/
+kubectl apply -f kubernetes/servicemesh/applications/videos-api/
+kubectl apply -f kubernetes/servicemesh/applications/videos-web/
+kubectl apply -f kubernetes/servicemesh/applications/videos-db/
+```
+
+## Make sure our applications are running 
+
+```
+kubectl get pods
+NAME                            READY   STATUS    RESTARTS   AGE  
+playlists-api-d7f64c9c6-rfhdg   1/1     Running   0          2m19s
+playlists-db-67d75dc7f4-p8wk5   1/1     Running   0          2m19s
+videos-api-7769dfc56b-fsqsr     1/1     Running   0          2m18s
+videos-db-74576d7c7d-5ljdh      1/1     Running   0          2m18s
+videos-web-598c76f8f-chhgm      1/1     Running   0          100s 
+
+```
+
+## Make sure our ingress controller is running
+
+```
+kubectl -n ingress-nginx get pods
+NAME                                        READY   STATUS    RESTARTS   AGE  
+nginx-ingress-controller-6fbb446cff-8fwxz   1/1     Running   0          2m38s
+nginx-ingress-controller-6fbb446cff-zbw7x   1/1     Running   0          2m38s
+
+```
+
+We'll need a fake DNS name `servicemesh.demo` <br/>
+Let's fake one by adding the following entry in our hosts (`C:\Windows\System32\drivers\etc\hosts`) file: <br/>
+
+```
+127.0.0.1  servicemesh.demo
+
+```
+
+## Let's access our applications via Ingress 
+
+```
+kubectl -n ingress-nginx port-forward deploy/nginx-ingress-controller 80
+```
+
+## Access our application in the browser
+
+We should be able to access our site under `http://servicemesh.demo/home/`
+
+<br/>
+<hr/>
+
+# Getting Started with Istio
+
+Firstly, I like to do most of my work in containers so everything is reproducable <br/>
+and my machine remains clean.
+
+## Get a container to work in
+<br/>
+Run a small `alpine linux` container where we can install and play with `istio`: <br/>
+
+
+```
+docker run -it --rm -v ${HOME}:/root/ -v ${PWD}:/work -w /work --net host alpine sh
+
+# install curl & kubectl
+apk add --no-cache curl nano
+curl -LO https://storage.googleapis.com/kubernetes-release/release/`curl -s https://storage.googleapis.com/kubernetes-release/release/stable.txt`/bin/linux/amd64/kubectl
+chmod +x ./kubectl
+mv ./kubectl /usr/local/bin/kubectl
+export KUBE_EDITOR="nano"
+
+#test cluster access:
+/work # kubectl get nodes
+NAME                    STATUS   ROLES    AGE   VERSION
+istio-control-plane   Ready    master   26m   v1.18.4
+
+```
+
+## Install Istio CLI
+
+```
+curl -L https://istio.io/downloadIstio | ISTIO_VERSION=1.6.12 TARGET_ARCH=x86_64 sh -
+
+mv istio-1.6.12/bin/istioctl /usr/local/bin/
+chmod +x /usr/local/bin/istioctl
+
+mv istio-1.6.12 /tmp/
+
+```
+
+## Pre flight checks
+
+Istio has a great capability to check compatibility with the target cluster <br/>
+
+```
+istioctl x precheck
+
+```
+
+## Istio Profiles
+
+https://istio.io/latest/docs/setup/additional-setup/config-profiles/
+
+```
+istioctl profile list
+
+istioctl install --set profile=default
+
+kubectl -n istio-system get pods
+
+istioctl verify-install
+
+```
+
+https://istio.io/latest/docs/setup/additional-setup/sidecar-injection/
+
+## Manual sidecar injection
+kubectl get deploy playlists-api -o yaml | istioctl kube-inject -f - | kubectl apply -f -
+
+
+# Mesh our video catalog services
+
+There are 2 ways to mesh:
+
+1) Automated Injection: 
+
+You can set the `istio-injection=enabled` label on a namespace to have the istio side car automatically injected into any pod that gets created in the labelled namespace
+
+This is a more permanent solution:
+
+```
+  template:
+    metadata:
+      labels:
+        istio-injection: enabled
+```
+
+2) Manual Injection:
+This may only be temporary as your CI/CD system may roll out the previous YAML.
+You may want to add this command to your CI/CD to keep only certain deployments part of the mesh.
+
+```
+kubectl get deploy
+NAME            READY   UP-TO-DATE   AVAILABLE   AGE
+playlists-api   1/1     1            1           8h 
+playlists-db    1/1     1            1           8h 
+videos-api      1/1     1            1           8h 
+videos-db       1/1     1            1           8h 
+videos-web      1/1     1            1           8h 
+
+# You can manually inject istio sidecar to every deployment like this:
+
+kubectl get deploy playlists-api -o yaml | istioctl kube-inject -f - | kubectl apply -f -
+kubectl get deploy playlists-db -o yaml | istioctl kube-inject -f - | kubectl apply -f -
+kubectl get deploy videos-api -o yaml | istioctl kube-inject -f - | kubectl apply -f -
+kubectl get deploy videos-db -o yaml | istioctl kube-inject -f - | kubectl apply -f -
+kubectl get deploy videos-web -o yaml | istioctl kube-inject -f - | kubectl apply -f -
+kubectl -n ingress-nginx get deploy nginx-ingress-controller  -o yaml | istioctl kube-inject -f - | kubectl apply -f -
+
+```
+
+# TCP \ HTTP traffic
+
+# Observability
+
+## Kiali 
+
+note: rerun for CRDs
+```
+kubectl apply -f /tmp/istio-1.6.12/samples/addons/kiali.yaml
+
+
+kubectl -n istio-system port-forward svc/kiali 20001
+```