Download git and use it to clone this repo

1. Download k8s cluster manager e.g. Docker
2. Docker on a laptop is best to start with to get you commands to create images and manage them
3. Download kubectl, kops, kubeadm to manage k8s cluster and apps (kops - if youre using AWS, GCE or external cloud infra, else kubectl will do)
4. Some of the commands are built for zsh (but w/ a few tweaks can work w/ bash also)
5. Download golang

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Functionally test app

make clean make local dist/main dist/get

curl http://localhost:8001 ({/counter} {/counter/get})

Build the docker image for main-python

docker build --rm -f docker/Main_Dockerfile -t main-go:latest .

Clean up unused images

docker image prune

Clean up unused containers, images etc

docker system prune

List the image

docker image ls

Test image to get a shell

docker run -it main-go /bin/sh

Test image w/ app

docker run -p 8000:8001 main-go

Remove image

docker image rm -f main-go

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Create vol

kubectl apply -f k8s/pv-vol.yaml

Create claim

kubectl apply -f k8s/pv-claim.yaml

Deploy main-py

kubectl apply -f k8s/main-go.yaml

Launch pod to test pv

kubectl apply -f k8s/pv-test.yaml

Launch pod for get counter

kubectl apply -f k8s/get-py.yaml

Launch pod for roll counter

kubectl apply -f k8s/roll-py.yaml

Launch pod for reset counter

kubectl apply -f k8s/reset-py.yaml

Start service for main

kubectl apply -f k8s/service.yaml

Start service for get counter

kubectl apply -f k8s/get-service.yaml

Start service for roll counters

kubectl apply -f k8s/roll-service.yaml

Start service for reset counter

kubectl apply -f k8s/reset-service.yaml

To debug

kubectl exec -it /bin/sh #####################################################################################################

Test app this will get the counters

http://localhost:5000

Get Counters

curl http://localhost:6000/counter/get/get -> Internal microservice curl http://localhost:5000 curl http://localhost:5000/counter/main curl http://localhost:5000/counter/get

Roll Counters

curl -X PUT http://localhost:8000/counter/roll/roll -> Internal microservice curl -X PUT http://localhost:5000/counter/roll

Reset Counters

curl -X PUT http://localhost:7000/counter/reset/reset -> Internal microservice curl -X PUT http://localhost:5000/counter/reset

use pv-test to launch/exec shell and check counters

kubectl exec -it nfs-dataaccess /bin/sh

Test by bouncing/deleting pods using kubectl or mgmnt console

kubectl delete pod -l app=main-python kubectl delete pod -l app=get-python kubectl delete pod-l app=roll-python kubectl delete pod -l app=reset-python

New pods will reconnect and continue counting from before

Tailing logs

kubectl logs -f -n default -l app=main-python kubectl logs -f -n default -l app=get-python kubectl logs -f -n default -l app=roll-python kubectl logs -f -n default -l app=reset-python

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Creates mgmtn console

kubectl apply -f https://raw.githubusercontent.com/kubernetes/dashboard/v2.4.0/aio/deploy/recommended.yaml

Creates account/access

kubectl create clusterrolebinding serviceaccounts-cluster-admin --clusterrole=cluster-admin --group=system:serviceaccounts

Browser/UI

http://localhost:8001/api/v1/namespaces/kubernetes-dashboard/services/https:kubernetes-dashboard:/proxy/.

This will start the mmgnt console

kubectl proxy

Get TOKEN to log into above

APISERVER=$(kubectl config view --minify | grep server | cut -f 2- -d ":" | tr -d " ") SECRET_NAME=$(kubectl get secrets | grep ^default | cut -f1 -d ' ') TOKEN=$(kubectl describe secret $SECRET_NAME | grep -E '^token' | cut -f2 -d':' | tr -d " ") echo $TOKEN

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W/ NFS

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Setup NFS Server (ubuntu)

ssh testuser@10.0.0.228/testuser (this has sudo) /etc/exports

/srv/data *(rw,fsid=0,async,no_subtree_check,no_auth_nlm,insecure,no_root_squash) exportfs -ra

Setup NFS server (raspberry pi)

ssh pi@10.0.0.52/ (this has sudo) /etc/exports

/srv/data *(rw,fsid=0,async,no_subtree_check,no_auth_nlm,insecure,no_root_squash) exportfs -ra

Raspberry pi - get buster

/etc/apt/sources.list deb http://raspbian.raspberrypi.org/raspbian/ buster main contrib non-free rpi deb http://archive.raspberrypi.org/debian/ buster main

Install/setup NFS server on raspberry pi

apt update apt full-upgrade apt-get install nfs-kernel-server systemctl start nfs-kernel-server.service

Test nfs mount from MAC

mount -t nfs -o resvport,nfsvers=4 10.0.0.228:/srv/data mnt/data

Setup K8s w/ NFS mounts

kubectl apply -f k8s/nfs-pv-vol.yaml kubectl apply -f k8s/nfs-pv-claim.yaml kubectl apply -f k8s/nfs-pv-test.yaml

Test NFS (make sure k8s test pod is able to see the mount point)

kubectl exec -it nfs-dataaccess /bin/sh

Test app like above

curl http://localhost:5000 cat /mnt/data/counter.txt

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W/ Service Mesh istio

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kubectl apply -f sample/addons (this will install all)

kubectl label namespace default istio-injection=enabled

export INGRESS_HOST=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.status.loadBalancer.ingress[0].hostname}') export INGRESS_PORT=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.spec.ports[?(@.name=="http2")].port}') export SECURE_INGRESS_PORT=$(kubectl -n istio-system get service istio-ingressgateway -o jsonpath='{.spec.ports[?(@.name=="https")].port}') export GATEWAY_URL=$INGRESS_HOST:$INGRESS_PORT

Testing w/ Service mesh

curl localhost/counter/get curl -X PUT localhost/counter/roll curl localhost/counter/get

Launch Kiali dashboard

istioctl dashboard kiali kubectl -n istio-system port-forward service/kiali 20001:20001

Launch grafana

istioctl dashboard grafana kubectl -n istio-system port-forward service/grafana 3000:3000

Launch prometheus

istioctl dashboard prometheus kubectl -n istio-system port-forward service/prometheus 9090:9090

Testing Canary w/ Service mesh - roll. Tail / follow the roll-logs to spot incr 10 vs 2

for i in $(seq 1 100); do curl -s -X PUT "http://localhost/counter/roll"; echo "\n"; done kubectl logs -f -n default -l app=roll-python

Testing Canary w/ Service mesh - get. Tail / follow the main's get-logs to spot v2 api/logs

for i in $(seq 1 100); do curl -s "http://localhost/counter/get"; echo "\n"; done kubectl logs -f -n default -l app=main-python

Deploy main-gw separately (this contains the destination rule also)

kubectl apply -f k8s/main-gw.yaml

Two routing modes based headers (header) and percentage of traffic (canary) - both can co-exist

kubectl apply -f k8s/canary-routing.yaml

for i in $(seq 1 100); do curl -s "http://localhost/counter/get"; echo "\n" ; done

kubectl apply -f k8s/header-routing.yaml

curl -H x1-version:v1 localhost/counter/get

curl -H x1-version:v2 localhost/counter/get

Three versions - API based routing - get in one version (v1), roll in another (v2) and reset in yet another (v3).

for i in $(seq 1 100); do curl -s -H x1-version:v2 -X PUT "http://localhost/counter/roll"; curl -s "http://localhost/counter/get"; curl -s -X PUT "http://localhost/counter/reset"; echo "\n" ; done