Collecting a DRVA Core Dump

Generate the Core Dump

A core dump is an invaluable tool for troubleshooting DRVA issues. Typically, when a DRVA VM crashes a core dump will automatically be generated. However, this may not occur in all cases and a core dump will then need to be manually collected.

• Connect to the DRVA VM console (via SSH or Web console).
• Perform the following steps in sequence:

1. Log into the DRVA console as admin user.

2. Change permission of /tmp directory using the command: sudo chmod 777 /tmp

• Validate the permission with the command: ls -l

3. Disable enforcement mode using the command: sudo setenforce 0

4. Disable watchdog (to avoid the DRVA automatically being rebooted by watchdog) using the command:
sudo systemctl stop watchdog

5. Execute the command: echo 2 | sudo tee /proc/sys/fs/suid_dumpable

6. Execute the command:
echo "|/bin/lz4 -z -6 - /tmp/core-%t-pid%p-sig%s.lz4" | sudo tee /proc/sys/kernel/core_pattern

7. Execute the command: sudo kill -6 $(pidof drva_prog)

• The DRVA service should restart and a core dump will be generated and placed in the /tmp directory.

8. Restart enforcement mode using the command: sudo setenforce 1 

9. Restart watchdog using the command: sudo systemctl start watchdog

10. If necessary, the output .lz4 file can be compressed with the command: xz -T0 -4 -v <core file.lz4>

Transfer the Core Dump from the DRVA

The generated core dump is not part of the MSA Support Bundle and must be transferred to the MSA with SCP.

• The SCP command should be run on the DRVA from where the core is collected:
  scp <path of the source file> <username@Destination IP/FQDN>: <path of destination directory>

• In the above scenario, the core dump file core-1712219004-pid46153-sig6.lz4 is located in the /tmp directory on the DRVA (source).

• [email protected] corresponds to the root user on the MSA (destination).
  • The core dump file will be transferred into the /tmp directory of the MSA.

• After the core dump has been transferred to the MSA, it can be further copied to the local machine or transmitted to the support team.

Note: When using SCP, core dump files can be directed to the destination directory on the MSA where JetStream DR support bundle logs are collected: /var/lib/vme2/logs/drva.

For example:
scp /tmp/core-1712219004-pid46153-sig6.lz4 [email protected]:/var/lib/vme2/logs/drva

In this case, a generated MSA support bundle will also contain the core dump thus eleminating the additional step to transfer it separately.


Core dump copied into the support bundle.

If using SCP to direct the core dump into the support bundle, be sure to verify the core dump is successfully copied; otherwise, it must be manually transferred from the DRVA as described above.