When an issue occurs, please run the command “show tech support” to pack the debug information before recovery, i.e., reboot switch or “config reload”
admin@sonic:~$ show techsupport .... removed directory '/var/dump/sonic_dump_sonic_20220222_224649/warmboot' removed directory '/var/dump/sonic_dump_sonic_20220222_224649' mkdir: created directory '/var/dump/sonic_dump_sonic_20220222_224649' mkdir: created directory '/var/dump/sonic_dump_sonic_20220222_224649/log' sonic_dump_sonic_20220222_224649/log/techsupport_time_info.wIbTFHQKUe removed '/var/dump/sonic_dump_sonic_20220222_224649/log/techsupport_time_info.wIbTFHQKUe' removed directory '/var/dump/sonic_dump_sonic_20220222_224649/log' removed directory '/var/dump/sonic_dump_sonic_20220222_224649' /var/dump/sonic_dump_sonic_20220222_224649.tar.gz
All logs are saved to /var/dump
admin@sonic:~$ ls -lh /var/dump/ total 9.3M -rw-r--r-- 1 root root 6.0M Feb 22 22:46 sonic_dump_sonic_20220222_224633.tar -rw-r--r-- 1 root root 3.4M Feb 22 22:47 sonic_dump_sonic_20220222_224649.tar.gz