User Guide

The PyKdump framework provides quite a few ready to use programs to allow users to quickly extract and process various useful information from vmcore dump.

These in-built programs can be used to quickly fetch details about SCSI adapters, disk devices, multipath maps, LVM volumes, TCP/IP sockets, NFS mounts, processes holding or waiting for mutex locks and much more. Some of these programs also provide an option to run automated checks and report potential issues.

These programs can be accessed by loading the extension in crash environment:

crash> extend /test/mpykdump.so
Setting scroll off while initializing PyKdump
/test/mpykdump.so: shared object loaded

Once the extension is loaded, the commands provided by built-in programs can be viewed as below. Using ‘-h’ option with these commands will provide more details about what a specific command does and options provided by it:

crash> extend
SHARED OBJECT        COMMANDS
/test/mpykdump.so    epython xportshow crashinfo taskinfo nfsshow hanginfo
                     fregs tslog scsi scsishow dmshow pstree modinfo

The epython command in above list allows direct execution of any custom python programs written using this framework, without a need to rebuild the whole extension.

Use below links to view the documentation for individual programs: