IMPERATIVE COMMANDS Passing credentials via environment variable https://cloud.google.com/docs/authentication/production#passing_variable WINDOWS set GOOGLE_APPLICATION_CREDENTIALS=GOOGLE_CREDENTIALS.json LINUX export GOOGLE_APPLICATION_CREDENTIALS="GOOGLE_CREDENTIALS.json

Authenticate Google Cloud API https://stackoverflow.com/a/63181221/1445318 gcloud auth login gcloud container clusters get-credentials <cluster name: ticketing-dev> --zone <zone:us-east1-b> --project <project id:ticketing-dev-308807> gcloud config set project <project id>

TODO: Test Istio, grafana, prometheus etc in gcloud

Mongoose user model vs mongoose user document Mongoose user model represents the entire collection of users, while Mongoose user document represents one single user

Create a secret kubectl create secret generic <name of the secret i.e jwt-secret> --from-literal JWT_KEY=asdf

Get existing secret kubectl get secrets

Switch cygdrive directory cd /cygdrive/e/Projects/Samples/Microservices/ticketing/devops/

TODO: Test if building services without istio is faster

Start skaffold in dev mode with manual trigger skaffold dev --trigger=manual

Use skaffold profiles to switch between local and GCP contexts skaffold dev -p gcb

TODO: Create a kubernetes ExternalName service to simplify the URL to istio gateway in SSR

Run an interactive shell in a pod kubectl exec -it client-depl-7c98465cc6-cqwq5 -c client -- /bin/sh

Make a cURL request to the ingress gateway from within a pod curl http://istio-ingressgateway.istio-system.svc.cluster.local/api/users/currentuser

cURL HTTP request from client pod to auth pod kubectl exec "$(kubectl get pod -l app=client -o jsonpath='{.items[0].metadata.name}')" -c client -- curl -sS auth-srv:3000/api/users/currentuser | grep -o "<title>.*</title>"

Setup port forwarding on a specific port to a pod running within our cluster (This should only be used for troubleshooting in a development environment) kubectl port-forward <name of the pod><port on local machine: port on the pod>

NATS streaming server monitoring page http://localhost:8222/streaming NATS streaming server subscriptions in channels info page http://localhost:8222/streaming/channelsz?subs=1

Restarting a pod: Delete the pod and let the deployment automatically recreate it kubectl delete pod/<pod name>

Disable istio sidecar injection in the default namespace kubectl label namespace default istio-injection-

Enable istio sidecar injection in the default namespace kubectl label namespace default istio-injection=enabled

Connect to orders and tickets mongo pods kubectl port-forward <orders-mongo-pod-name> 28017:27017 kubectl port-forward <tickets-mongo-pod-name> 29017:27017 mongo --host localhost:28017 mongo --host localhost:29017

Connect to mongodb pod and run commands against the mongo database kubectl exec -it <pod name for mongodb> mongo

Useful MongoDB commands https://docs.mongodb.com/manual/reference/mongo-shell/#command-helpers List all dbs in a mongo database show dbs; Switch current mongo database use <db name> Find a mongodb record db.tickets.find({price: 15 }) Verify that mongodb collection has record(s) db.tickets.find({price: 15 }).length() Show collections in the current database show collections

NUKE DOCKER IMAGES AND CONTAINERS (First check that you have pushed the latest image of the erring container to docker hub) docker container stop $(docker container ls -aq) docker container rm $(docker container ls -aq) -f docker image rm $(docker image ls -aq) -f

TODO RabbitMQ Database polling