Because the number of quay-app replicas has been reduced to 0 in the previous step, the subsequent command to search for the database in the quay-app pod is wrong.

1. Executing this command will result in an error

~$ oc -n <quay_namespace> rsh $(oc get pod -l app=quay -o NAME -n <quay_namespace> |head -n 1) cat /conf/stack/config.yaml|awk -F"/" '/^DB_URI/

'
Error from server (NotFound): pods "cat" not found~

https://docs.redhat.com/zh-cn/documentation/red_hat_quay/3.14/html/red_hat_quay_operator_features/backing-up-red-hat-quay-operator#backing-up-managed-database