MySQL master-slave backup under Linux

when using Ubuntu as a development environment, it is often necessary to install a number of dependent frameworks globally, this time often need to use root permissions, but in Ubuntu under the first use of the SU command will prompt authentication failure; After finding the data, it is found that the root permission is locked by default in Ubuntu and may be in security, but as a developer, it must be rooted.

At the command line, you can enter the following command to set the root password so that you can use root permissions at any time:

[Email protected]:~$ su Password: su: Authentication failed [email protected]:~$ sudo passwd[sudo] password for sweetvvck: Enter new UNIX password: Re-enter new Unix Password: passwd: Password has been successfully updated