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I had installed CentOS(CLI,minimal).it have no GUI.i want connect to WiFi but answers on askubuntu are not working..I want to know following:-

• How to turn WiFi on/off?


• How to get list of available WiFi connections?


• How to connect WiFi that i want to connect with?

The best and easy option I like to use with CentOS is nmtui. (Ref: Redhat)

THIS IS NOT GUI, IT IS TUI (TEXT USER INTERFACE)

First you have to install nmtui,

# yum install NetworkManager-tui

Then,

# nmtui

This will option up what you are after.

Now you can go to Edit connection and itwill list out all the available WiFi connections for you. Then you can select what you want and Activate/Deactivate what ever you want.

To run the ifconfig ... command , you should install the net-tools package.

Because the net-tools is deprecated there is the ip and iw commands which answer your question:

How to turn WiFi on/off?

$ ip link set <interface> up
$ ip link set <interface> down

How to get list of available WiFi connections?

$ iw dev <interface> scan | grep SSID

How to connect WiFi that i want to connect with?

Create a wpa_supplicant configuration file with the following content:

ctrl_interface=/run/wpa_supplicant
update_config=1
ap_scan=1

To add the SSID and the password, run:

$ wpa_passphrase "YOUR-SSID" YOUR-PASSWD >> /etc/wpa_supplicant/wpa_supplicant.conf

To connect run:

$ wpa_supplicant -i <interface> -c /etc/wpa_supplicant/wpa_supplicant.conf -B
dhclient <interface>

You should be able to see if the drivers for the card are installed by using lspci -k

And then to know if your interface is correctly detected and named you can use ip link
You can then try to bring up the interface with ifup

If the interface does not come up correctly it might be because you're missing a configuration file like /etc/sysconfig/network-scripts/ifcfg-<interface-name>

Another alternative solution if it's something you only want to bring up once you can input the following commands :

ip link set dev <interface-name> up
wpa_supplicant -B -i <interface-name> -c /etc/wpa_supplicant/wpa_supplicant.conf
dhcpcd <interface-name>

If you are running CentOS 7:
You may want to check if NetworkManager is already there available for you to use:

chkconfig NetworkManager on

service NetworkManager start

Issue command: nmtui

Go directly to "Active a connection" to check if you already can see your wireless network/wi-fi. If so, input your password.

You can also Edit a profile for the wi-fi you want to connect.

NOTE: if you cannot active a wi-fi, try the following:
After above steps: /etc/init.d/network restart
OR REBOOT/RESTART your box.

Here is my experience, for the following reasons:

1. If you got connected to Wifi network when you have installed CentOS 7.


2. After CentOS 7 entering into sleep mode OR accidental shutdown due to power drainage OR you have restarted & logged into CentOS 7

and if your wifi not working.

Don't install extra kernel module/do any tweaks/install any new packages

Just shutdown and boot again in CentOS 7. Your wifi will start working again.

This is what I realised after 6 hours of tweaks and tried everything out.