Delay readinessProbe for Kubernetes

To do this, The image must have shell (sh/bash) and curl version 8+ and this script will always return “TRUE” for 90 seconds then to the real probe.

        readinessProbe:
          exec:
            command:
              - "sh"
              - "-c"
              - |
                # Get the pod's uptime in seconds
                POD_UPTIME=$(cat /proc/1/stat | awk '{print $22}')
                CURRENT_TIME=$(date +%s)
                SECONDS_UP=$((CURRENT_TIME - POD_UPTIME / 100))
                
                # Check if the pod has been up for more than 90 seconds
                if [ $SECONDS_UP -lt 90 ]; then
                  echo "Pod uptime is less than 90 seconds"
                  exit 0
                fi

                # If pod uptime is more than 90 seconds, run the curl check
                curl --fail -o /dev/null -sS -m 2 127.0.0.1:3000/health
          initialDelaySeconds: 10
          periodSeconds: 10
          failureThreshold: 3
          timeoutSeconds: 3

Good luck.