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Troubleshooting "failed to read all source data" issue
Sometimes, the backup fails due to Stash being unable to read the targeted data. In this guide, we are going to explain the possible scenario when this error can happen and what you can do to solve the issue.
Identifying the issue
If you describe the respective BackupSession or view the log from the respective backup sidecar/job, you should see the following error:
Warning: failed to read all source data during backup
Possible reason
By default, Stash runs backup as a non-root user. If the target data directory is not readable to all users, then Stash will fail to read the targeted data.
Solution
Run the backup process as the same user as the targeted application or run the backup process as the root user.
Here is an example of BackupConfiguration for running backup as the root user:
apiVersion: stash.appscode.com/v1beta1
kind: BackupConfiguration
metadata:
name: sample-statefulset-backup
namespace: demo
spec:
repository:
name: s3-repo
schedule: "*/3 * * * *"
target:
ref:
apiVersion: apps/v1
kind: StatefulSet
name: stash-demo
volumeMounts:
- name: data-volume
mountPath: /my/data
paths:
- /my/data
runtimeSettings:
container:
securityContext:
runAsUser: 0
runAsGroup: 0
retentionPolicy:
name: 'keep-last-5'
keepLast: 5
prune: true
If you don’t want to run the backup as root user, then set the runAsUser and runAsGroup to match with your application user and group id.