The-p parameter of the TAR catalog

All files in the archive are relative references, and the archive is decompressed (released) in the current directory. Archive files are always released to the current directory to prevent the destruction of files with duplicate names in the file system.

Therefore, the landlord's decompression will not overwrite/var/lib/mysql, will only be released in the current directory first, that is./var/lib/mysql if you want to overwrite, use the-p parameter when archiving and decompression:

Tar zcvf mysql.tar.gz-p/var/lib/mysql

TAR-PZXVF mysql.tar.gz

The-p parameter of the TAR catalog