After centos7 is this, is another version of the previous 7
1.systemctl get-default command to get the current mode
SET-default 2.systemctl graphical.target modify the startup mode (to modify the graphical interface, and if the command line is modified to multi-user.target)
The SET-default 2.systemctl multi-user.target modify the startup mode
3.reboot restart it
If 4.oracle mounted to a graphical desktop, xhost + needs to be performed in the root user, displaying "access control disabled, clients can connect from any host", which is switched to the oracle user (su - oracle), under oracle user, performing export DISPLAY = client IP address: 0.0, it can then switch to perform ./runInstaller, you can see the image database interface installation directory under oracle ( Note: If the image of the installation oracle database, need to install xmanager software)
5. Create oracle listening command netca, create oracle database instance command: dbca