Spark tutorial-Build a spark cluster-run the Ubuntu system (1)

To simplify permissions and other issues, we can log on to and use the Ubuntu system as a root user, while Ubuntu does not enable the root user by default, which requires the following settings:

• Sudo-s enters the root user permission Mode
• Vim/etc/lightdm. conf
  [Seatdefaults]
  Greeter-session = unity-greeter
  User-session = Ubuntu
  Greeter-show-manual-login = true #Manually enter the user name and password for logging on to the system
  Allow-Guest = false #Guest not allowedLogin
• Start the root account: sudo passwd Root

The following describes the specific operations of Jialin:

 

Step 1: Enter Root User Permissions:

Use Sudo-s to enter the root user permission Mode

Enter the password to enter the root mode.

At this point, we found that it is already a root user.

Step 2: Modify the "/etc/lightdm. conf" file:

At this time, the system prompts that we do not have the vim editor. Install the vim Editor:

Enter "Y" to complete the installation.

Modify the "/etc/lightdm. conf" file again:

Enter the file:

Enter "I" to enter the insert and modify mode, and change the file:

Press "ESC" and enter ": WQ" to save and exit.

 

Step 3: Start the root account: sudo passwd Root

Press Enter:

In this case, enter the password of the root account and set it as follows:

Restart the system:

The system entry page is as follows:

Click "login ":

Enter the "root" account:

Enter the password to log on to the system:

At this point, we found that the account we logged on to is the root account.