CentOS

WiFi

Log in as root (not sudo):

Turn wifi on

nmcli radio wifi on

List available access points(AP) to connect to

nmcli device wifi list

Create a new connection to a password protected AP

nmcli device wifi connect <SSID|BSSID> password <password>

XFCE

yum groupinstall 'X Window System'

yum install epel-release -y

yum groupinstall 'Xfce'

systemctl set-default graphical.target

Reboot

IMPORTANT:

• To login from a display manager: systemctl set-default graphical.target
• To login from the CLI: systemctl set-default multiuser-target

GRUB2

How to accommodate another OS in the GRUB2 config file:

1. Install os-prober if it's not already installed:

# yum install os-prober

2. Then reconfigure the grub config file:

# grub2-mkconfig -o /boot/grub2/grub.cfg

or

# update-grub

Networking

There are several ways to configure networking: NetworkManager, network script, sysconfig/ifcfg files and the CLI. They can be used in parallel.

Please check very important documentation at Red Hat documentation

• Network Manager uses: nmtui and nmcli. Service: systemctl start|stop|restart|status NetworkManager
• Network script uses: ip utility, iproute. Service: systemctl start|stop|restart|status network /etc/init.d/network
• Sysconfig/ifcfg files uses: ifcfg files. Service: ifup-* and ifdown-* These files are located in /etc/sysconfig/network-scripts/
• The Command Line Interface uses: ip command

Network Manager

First we are going to configure your CentOS system to automatically start the NetworkManager on startup. You can do this by running:

chkconfig NetworkManager on or systemctl enable NetworkManager

Then we are going to start it so we can use it right away without needing to reboot:

service NetworkManager start or systemctl start NetworkManager

If you have done that in your graphical environment (Gnome), your Notification Area (usually in the Gnome panel on the top-right) will show a new icon. If you left-click on this icon, you will see a list of possible Wireless networks to connect to.

You may also want to disable the network and wpa_supplicant services at boot time, as NetworkManager will now handle these. For this, simply do:

chkconfig network off or systemctl disable network

chkconfig wpa_supplicant off or systemctl disable wpa_supplicant

wpa_supplicant

lspci

# yum install pciutils

Change tyy resolution

press 'c' when in grub menu

> vbeinfo 

edit /etc/default/grub and add these two lines:

GRUB_GFXMODE=1366x768x32*

GRUB_GFXPAYLOAD_LINUX=1366x768x32*

*use resolution shown with vbeinfo

# grub2-mkconfig -o /boot/grub/grub.cfg

reboot