Running migrations in k8s

job.yaml

apiVersion: batch/v1
kind: Job
metadata:
  name: testjob
spec:
  # Never retry this job.
  backoffLimit: 0
  template:
    spec:
      containers:
      - name: migrate
        image: alpine:3.19
        command: ["sh", "-c", "for i in $(seq 20); do echo $i; sleep 1; done; exit 1"]
        resources:
          requests:
            cpu: "1"
            memory: 512Mi
      restartPolicy: Never

run

#!/bin/sh
#
set -eu

kubectl delete job/testjob 2>/dev/null || :
kubectl apply -f job.yaml
kubectl wait --for=condition=ready pod --selector=job-name=testjob --timeout=10m
kubectl logs -f job/testjob

if kubectl get job/testjob -o jsonpath='{.status.failed}' | grep -q '0'; then
  echo "Job succeeded"
else
  echo "Job failed"
fi