Challenge

The infrastructure is set up with minikube and fluxcd.
The bitnami PostgreSQL HA chart is used for a highly available PostgreSQL database backend.
kube-prometheus-stack is used for monitoring.
Trivy scans for vulnerabilities.

The app consists of two parts: an import job for PostgreSQL and the HA API deployment with the /success endpoint and a ReplicaSet of 2.

• Database: PostgresqlHA
• Import: gtfso-import
• API: gtfso-vbb
• Monitoring: kube-prometheus-stack
• Vulnerability Scanning: Trivy

Clone repository

$ git clone https://github.com/bbusse/obch
$ cd obch

Setup minikube and flux

Optionally remove remnants of previous minikube clusters

$ minikube delete --all

# The above was not sufficient to setup a new cluster
# Additionally deleting the local minikube config folder helped:
$ rm -rf ~/.minikube

Setup cluster and deploy app

run sh sources 'setup-cluster' and 'deploy'

Note

A Personal Access Token (PAT) is needed for fluxcd to create and/or write to its state repository

$ ./run.sh

Setup cluster

$ ./setup-cluster

Deploy Service

$ ./deploy

Stop cluster

$ minikube stop

Expected Result

Probe APIs /success endpoint

$ kubectl port-forward --namespace app gtfso-vbb-8586b6cddc-f29bh 8080:5000 &
$ curl http://localhost:8080/success
Success!

Probe Metrics

$ curl http://localhost:8080/metrics

Show services

 kubectl get service -A                                                                                                                      NAMESPACE       NAME                                                 TYPE        CLUSTER-IP       EXTERNAL-IP   PORT(S)                        AGE
app             gtfso-vbb                                            ClusterIP   10.99.63.60      <none>        80/TCP                         31m
app             pgsql-ha-postgresql-ha-pgpool                        ClusterIP   10.96.68.65      <none>        5432/TCP                       3h23m
app             pgsql-ha-postgresql-ha-postgresql                    ClusterIP   10.101.13.69     <none>        5432/TCP                       3h23m
app             pgsql-ha-postgresql-ha-postgresql-headless           ClusterIP   None             <none>        5432/TCP                       3h23m
default         kubernetes                                           ClusterIP   10.96.0.1        <none>        443/TCP                        3h31m
flux-system     notification-controller                              ClusterIP   10.111.215.54    <none>        80/TCP                         3h27m
flux-system     source-controller                                    ClusterIP   10.107.64.201    <none>        80/TCP                         3h27m
flux-system     webhook-receiver                                     ClusterIP   10.109.54.68     <none>        80/TCP                         3h27m
kube-system     kube-dns                                             ClusterIP   10.96.0.10       <none>        53/UDP,53/TCP,9153/TCP         3h31m
kube-system     prometheus-kube-prometheus-coredns                   ClusterIP   None             <none>        9153/TCP                       3h10m
kube-system     prometheus-kube-prometheus-kube-controller-manager   ClusterIP   None             <none>        10257/TCP                      3h10m
kube-system     prometheus-kube-prometheus-kube-etcd                 ClusterIP   None             <none>        2381/TCP                       3h10m
kube-system     prometheus-kube-prometheus-kube-proxy                ClusterIP   None             <none>        10249/TCP                      3h10m
kube-system     prometheus-kube-prometheus-kube-scheduler            ClusterIP   None             <none>        10259/TCP                      3h10m
kube-system     prometheus-kube-prometheus-kubelet                   ClusterIP   None             <none>        10250/TCP,10255/TCP,4194/TCP   3h8m
monitoring      alertmanager-operated                                ClusterIP   None             <none>        9093/TCP,9094/TCP,9094/UDP     3h8m
monitoring      prometheus-grafana                                   ClusterIP   10.105.202.74    <none>        80/TCP                         3h10m
monitoring      prometheus-kube-prometheus-alertmanager              ClusterIP   10.110.246.137   <none>        9093/TCP,8080/TCP              3h10m
monitoring      prometheus-kube-prometheus-operator                  ClusterIP   10.105.238.213   <none>        443/TCP                        3h10m
monitoring      prometheus-kube-prometheus-prometheus                ClusterIP   10.102.52.55     <none>        9090/TCP,8080/TCP              3h10m
monitoring      prometheus-kube-state-metrics                        ClusterIP   10.106.92.254    <none>        8080/TCP                       3h10m
monitoring      prometheus-operated                                  ClusterIP   None             <none>        9090/TCP                       3h8m
monitoring      prometheus-prometheus-node-exporter                  ClusterIP   10.109.107.194   <none>        9100/TCP                       3h10m
security-scan   trivy-trivy-operator                                 ClusterIP   None             <none>        80/TCP                         3h6m

TODOs / Notes

gtfso-import needs the database secret for import
gtfso-import: Retry job until success
Add gtfs-vbb as target to prometheus
Change default credentials for the kube-prometheus-stack
Define strategy for version updates
Consume and act on Trivy results
Consider SOPS / Vault for secret management
Terraform has minikube and flux providers

For a pure GitOps experience the path containing the yaml manifests created by 'flux create [..] --export' would have to be added to the fluxcd repository

Resources

Flux bootstrap for Gitea
Flux github action
Flux Monitoring
Flux Monotioring custom metrics
Terraform Flux Provider
Mozilla SOPS
bitnami PostgreSQL HA Helm
Trivy