Sina TavakkolDay 37/40
Application Failure Troubleshooting From CKA
Video Link
@piyushsachdeva
Git Repository
My Git Repo
In this section, we're looking at application failures.
We have a sample app for instance
git clone https://github.com/piyushsachdeva/example-voting-app.git
As it mentioned in the source repository:
- A front-end web app in Python which lets you vote between two options
- A Redis which collects new votes
- A .NET worker which consumes votes and stores them in…
- A Postgres database backed by a Docker volume
- A Node.js web app which shows the results of the voting in real time
root@sinaops:/opt/example-voting-app# docker compose up -d
...
root@sinaops:/opt/example-voting-app# docker compose ps
NAME IMAGE COMMAND SERVICE CREATED STATUS PORTS
example-voting-app-db-1 postgres:15-alpine "docker-entrypoint.s…" db 32 seconds ago Up 31 seconds (healthy) 5432/tcp
example-voting-app-redis-1 redis:alpine "docker-entrypoint.s…" redis 32 seconds ago Up 31 seconds (healthy) 6379/tcp
example-voting-app-result-1 example-voting-app-result "nodemon --inspect=0…" result 32 seconds ago Up 25 seconds 127.0.0.1:9229->9229/tcp, 0.0.0.0:5001->80/tcp, :::5001->80/tcp
example-voting-app-vote-1 example-voting-app-vote "python app.py" vote 32 seconds ago Up 25 seconds (healthy) 0.0.0.0:5000->80/tcp, :::5000->80/tcp
example-voting-app-worker-1 example-voting-app-worker "dotnet Worker.dll" worker 32 seconds ago Up 26 seconds
Run in Kubernetes:
root@sinaops:/opt/example-voting-app# kubectl apply -f k8s-specifications/
deployment.apps/db created
service/db created
networkpolicy.networking.k8s.io/access-redis created
deployment.apps/redis created
service/redis created
deployment.apps/result created
service/result created
deployment.apps/vote created
service/vote created
deployment.apps/worker created
root@sinaops:/opt/example-voting-app# kubectl get pods,deploy,svc -o wide
NAME READY STATUS RESTARTS AGE IP NODE NOMINATED NODE READINESS GATES
pod/db-597b4ff8d7-h4flp 1/1 Running 0 21m 10.85.0.10 cloudy.net <none> <none>
pod/redis-796dc594bb-dgglw 1/1 Running 0 21m 10.85.0.11 cloudy.net <none> <none>
pod/result-d8c4c69b8-ffc8n 1/1 Running 0 21m 10.85.0.16 cloudy.net <none> <none>
pod/vote-69cb46f6fb-ln4np 1/1 Running 0 21m 10.85.0.12 cloudy.net <none> <none>
pod/worker-5dd767667f-4csr5 1/1 Running 0 21m 10.85.0.15 cloudy.net <none> <none>
pod/worker-5dd767667f-l2589 1/1 Running 0 21m 10.85.0.13 cloudy.net <none> <none>
pod/worker-5dd767667f-m6xk2 1/1 Running 0 21m 10.85.0.14 cloudy.net <none> <none>
NAME READY UP-TO-DATE AVAILABLE AGE CONTAINERS IMAGES SELECTOR
deployment.apps/db 1/1 1 1 21m postgres postgres:15-alpine app=db
deployment.apps/redis 1/1 1 1 21m redis redis:alpine app=redis
deployment.apps/result 1/1 1 1 21m result dockersamples/examplevotingapp_result app=result
deployment.apps/vote 1/1 1 1 21m vote dockersamples/examplevotingapp_vote app=vote
deployment.apps/worker 3/3 3 3 21m worker dockersamples/examplevotingapp_worker app=worker
NAME TYPE CLUSTER-IP EXTERNAL-IP PORT(S) AGE SELECTOR
service/db ClusterIP 10.110.219.117 <none> 5432/TCP 21m app=db
service/kubernetes ClusterIP 10.96.0.1 <none> 443/TCP 2d <none>
service/redis ClusterIP 10.109.149.22 <none> 6379/TCP 21m app=redis
service/result NodePort 10.100.83.247 <none> 5001:31001/TCP 21m app=results
service/vote NodePort 10.98.179.36 <none> 5000:31000/TCP 21m app=vote
