Working examples for Docker using Docker compose and Docker Swarm

Images pull directly from dockersamples/ repo

Redis - frontend voting, database redis
Voting - frontend voting, python app on port 5000:80
DB - backend database, postgres, default username & password
Result - backend dashboard, express/nodejs app on port 5001:80
Worker - backend processing, C# app need redis & DB

Docker Swarm (single cluster, 1 replica for all images)

docker stack deploy STACK-NAME --compose-file=docker-stack.yml

replace STACK-NAME with voting-app maybe
Check stack docker stack ls
Check services docker service ls

Docker Compose (single host, single task/container)

docker compose up -d

Will remove obsolete links later
Compose v3, old one might use docker-compose up
Check docker ps -a

k8 single pod setup (LOCAL)

Apps' name were hard coded inside source codes e.g Redis(host="redis"), OpeRedisConnection("redis") (no3 of 12factor)
We will use Service name exactly like their hard coded in code based, except Worker no service/user consume this
DB, Redis don't need to expose to external (least privilege), ClusterIP
Expose Voting, Result, NodePort

Running pods kubectl create -f pod/FILENAME.yaml

Running services kubectl create -f service/FILENAME.yaml

kubectl get pod,svc to check running services and pods (all could do the job) After running all the files, we should have 4 services(2 Nodes, 2 Clusters), and 5 pods

We don't need to access worker pod
First we will exposse NodePort to user facing service like voting & result
We will have ClusterIP to make a stable connection, redis and db services
Later we will change NodePort to LoadBalancer to host on aws, gcp or azure

k8 single replica/deployment setup (LOCAL)

Running deploy kubectl create -f deployment/FILENAME.yaml