cl-support File

nv show system tech-support auto-generation

Shows if automatic cl-support file generation is active or inactive, and the reason for deactivation.

The switch generates the cl-support file automatically:

• When there is a core dump file in the /var/support/core directory for any application that Linux distributions support.
• When one of the monitored services fails for the first time after you reboot or power cycle the switch.

cl-support files can generate in quick succession due to a chain of faults, which burdens system resources and causes system instability. When this occurs, the switch deactivates automatic cl-support file generation and preserves the first cl-support file (which contains relevant diagnostic information) for troubleshooting.

Version History

Introduced in Cumulus Linux 5.16.0

Example

cumulus@switch:~$ nv show system tech-support auto-generation
                           operational                                                                                                                                                               applied
--------------         -----------------------------------------------------------------------------                                                  -------
state                    disabled                                                                                                             enabled
burst-duration      7200                                                                                                                    7200   
burst-size            5                                                                                                                          5      
reason                  found core file(s): lldpd.346499.1768799305.core lldpd.346502.1768799305.core         
support-file          /var/support/cl_support_cumulus_20260119_050826.txz                                   

Recovery Steps
=================
    Step  Action                                                                                                       
    ----  -------------------------------------------------------------------------------------------------------------
    1     Verify system health (CPU, memory, storage)                                                                  
    2     Collect the support files                                                                                    
    3     Re-activate tech support generation service manually "nv action activate system tech-support auto-generation”

nv show system tech-support files

Shows the cl-support files on the switch. The cl-support script generates a compressed archive file of useful information for troubleshooting. The system either creates the file automatically or you can create the file manually.

Version History

Introduced in Cumulus Linux 5.10.0

Example

cumulus@switch:~$ nv show system tech-support files
File name                              File path                                         
-------------------------------------  --------------------------------------------------
cl_support_leaf01_20240725_225811.txz  /var/support/cl_support_leaf01_20240725_225811.txz