"Failed to upload file from local storage." error when creating a backup archive schedule in Cloud Director Availability 4.x
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"Failed to upload file from local storage." error when creating a backup archive schedule in Cloud Director Availability 4.x

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Article ID: 315041

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Updated On:

Products

VMware Cloud Director

Issue/Introduction

  • Creating a backup archive schedule fails at the Server authentication step, and you see the following error:
Failed to upload file from local storage.
  • In the /opt/vmware/h4/<cloud|manager|replicator>/log/<cloud|manager|replicator>.log file on the appropriate Cloud Director Availability appliance, you see messages similar to:
2023-05-11 09:17:47.544 ERROR - [UI-########-####-####-####-############] [job-2] c.v.h.common.backup.FileUploadDeleteJob  : Unable to upload file /tmp/vcda_connection_test.
2023-05-11 09:17:47.544 DEBUG - [UI-########-####-####-####-############] [job-2] c.v.h.common.backup.FileUploadDeleteJob  : Exit code = 1
2023-05-11 09:17:47.544 DEBUG - [UI-########-####-####-####-############] [job-2] c.v.h.common.backup.FileUploadDeleteJob  : stdout = Enter password: Executing command:
/usr/bin/curl -T /tmp/vcda_connection_test sftp://##.##.##.##/mnt/DiskPool1/maitenance-backup/cama01/ --config -
Command stderr: '  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0

  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
curl: (2) Failure establishing ssh session: -5, Unable to exchange encryption keys
'
Command exited with '2'
 
2023-05-11 09:17:47.544 DEBUG - [UI-########-####-####-####-############] [job-2] c.v.h.common.backup.FileUploadDeleteJob  : stderr =  
2023-05-11 09:17:47.544 ERROR - [UI-########-####-####-####-############] [job-2] com.vmware.h4.jobengine.JobExecution     : Task 448fbc8f-cfdb-4077-ba6a-d6bd8263e0b0 (WorkflowInfo{type='upload', resourceType='file', resourceId='null', isPrivate=false, resourceName='null'}) has failed

com.vmware.h4.exceptions.common.backup.FailedToUploadFileException: Failed to upload file from local storage.
    at com.vmware.h4.common.backup.FileUploadDeleteJob.fail(FileUploadDeleteJob.java:156)
    at com.vmware.h4.common.backup.FileUploadDeleteJob.execute(FileUploadDeleteJob.java:125)
    at com.vmware.h4.common.backup.FileUploadDeleteJob.execute(FileUploadDeleteJob.java:37)
    at com.vmware.h4.jobengine.JobEngine.execute(JobEngine.java:226)
    at com.vmware.h4.jobengine.JobEngine.lambda$resumeQueuedJob$1(JobEngine.java:166)
    at com.vmware.h4.jobengine.ThrottledExecutorService$1.run(ThrottledExecutorService.java:132)
    at com.vmware.h4.common.mdc.MDCRunnableWrapper.run(MDCRunnableWrapper.java:30)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: com.vmware.subprocess.BadExitCodeException: Bad ExitCode: 1
    at com.vmware.subprocess.ShellResult.checkExitCode(ShellResult.java:45)
    at com.vmware.subprocess.Subprocess.exec(Subprocess.java:164)
    at com.vmware.h4.common.backup.FileUploadDeleteJob.execute(FileUploadDeleteJob.java:71)
    ... 8 common frames omitted 
  • Depending on the appliance role you are creating a backup schedule for, see the table below for the appropriate log file to check to confirm this issue:
Appliance Role Log Location
Cloud Director Replication Management Appliance /opt/vmware/h4/cloud/log/cloud.log
Cloud Director Combined Appliance /opt/vmware/h4/cloud/log/cloud.log
On-Premises to Cloud Director Replication Appliance /opt/vmware/h4/replicator/log/replicator.log
vCenter Replication Management Appliance /opt/vmware/h4/manager/log/manager.log
On-Premises to Cloud vCenter Replication Appliance /opt/vmware/h4/manager/log/manager.log


Note: The preceding log excerpts are only examples. Date, time, and environmental variables may vary depending on your environment.

Environment

VMware Cloud Director Availability 4.x

Cause

This issue occurs because the SFTP upload curl command uses libssh2 and in libssh2 the curl client cannot connect to OpenSSH servers running version 8.8 or later as OpenSSH Server 8.8 deprecated SHA1 signatures with RSA keys.

Resolution

This issue is resolved in Cloud Director Availability 4.7.

Workaround:
To work around this issue if you do not want to upgrade, perform the following steps on the external backup server when using OpenSSH server version 8.8 or later:

Note : If the openSSH version  is below 8.8.0, you will need to upgrade openSSH to 8.8.0 or later in order to perform below :

Command to check openSSH version : Login to external openSSH server and run command: ssh -V

After confirming the version, perform below commands:

  1. Add the following lines to the server's sshd_config file.
HostKeyAlgorithms +ssh-rsa
PubkeyAcceptedKeyTypes +ssh-rsa

Note: The sshd_config file location depends on the operating system.
  1. Then restart the sshd service, using a suitable command according to the underlying operating system.

Additional Information


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