In Linux, mysql has no password by default after installation. After logging in to mysql, you can use the "UPDATE user SET password=password("new password") WHERE user='root'" command to set a new password.

The operating environment of this tutorial: linux7.3 system, mysql8.0.22 version, Dell G3 computer.
What is the default mysql password in Linux
There is no password by default after installation.
After Linux downloads mysql, the default password for the root user is empty, that is, if you are prompted to enter the password, just press the Enter key.
Start the mysql server, log in to mysql, enter
mysql -u root
when prompted to enter the password and press Enter
Modify the password:
mysql> use mysql;
mysql> UPDATE user SET password=password("test123") WHERE user='root';Refresh the permission table, enter as follows Command: flush privileges
mysql> flush privileges
Exit: quit
mysql> quit
Log in again and enter the password you just changed.
There is no password by default, but you can only log in locally, not remotely. For example, if you are installed as root: Enter: mysql -uroot at the local command line to log in directly, and then change the username and password.
Enter mysql -u root -p without a password. Press Enter and continue to enter without entering the password. If you cannot enter, check whether the mysqld service is started. If not, enter service mysqld start to start.
Recommended learning: mysql video tutorial
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