No login interface for Centos 7 graphical interface

2016/5/8
Not a nice day, but go

Yesterday, somehow the CentOS login interface has been ruined.
Really suffered, help brother, solved. (Don't ask me how to fix it, I don't know).

Having such a big problem, I finally know something about Linux.

First of all, the interface is out of the question, what kind of interface do you use?

Gnome,kde?

CentOS generally defaults to gnome.
corresponding to the DGM service
KDE corresponds to the KDM

And what's this for?
Service GDM Status
Service KDM Status

The graphical interface does not go in, Ctrl+alt+f1~f6, press one. Enter the character interface to save the emergency.

CTRL +alt +FN Open the analog terminal, in short, the Linux system will automatically open 6 analog terminals, and then automatically switch to one (generally switching to the graphical interface that is, the window manager is running in these 6 analog terminal).
CTRL +alt +t Open is the window environment of the terminal simulation software, it is essentially a software, and VI and so no difference, just can transfer your input to the system and thus the equivalent of a terminal. This means that the terminal is running under the window manager.

View log, log is a very important path to get information

/var/log/xorg.0.log

VI Enter the log, how to find the error record in the log

command-line mode, enter
:/The string to find
This is

 ：/error

command to open the graphical interface within the character interface

 startx

Or

init 5

Finally, the kernel has been updated
Where is the kernel?

/usr/src/kernels/

Ls-l to see when the latest update was.

Each time the kernel is updated, there will be many versions selected at boot time, usually choosing the newest one. So don't show the rest of it. Boot,boot

/boot/grub2/grub.cfg

Comment out some of the kernel versions you don't need to use, and note that # OH. Tips: Before the comments, back up a bit

cp grub.cfg grub.cfg.bak

List software information that contains the XXXX field

rpm -qa|grep xxxx   

List installation information that contains XXXX

MySQL Database graphical interface

Navicat is not good.
Workbench is a good idea.
http://dev.mysql.com/downloads/file/?id=460950

As a prerequisite, you have to install MySQL server as well as MySQL.

Yum Graphical tools

yum install yumex

No login interface for Centos 7 graphical interface