linux not find IP solutions with ifconfig

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[root@localhost xws]# ifconfig
lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
        inet 127.0.0.1  netmask 255.0.0.0
        inet6 ::1  prefixlen 128  scopeid 0x10<host>
        loop  txqueuelen 1000  (Local Loopback)
        RX packets 2199  bytes 340131 (332.1 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 2199  bytes 340131 (332.1 KiB)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

1, view the configuration file is correct, if correct, perform 2

[root@localhost xws]# cd /etc/sysconfig/network-scripts/
[root@localhost network-scripts]# ls

2, view the file contents ifconfig-lo

[root@localhost xws]# vi ifcfg-lo

ifcfg-lo profile among the following:

3, using the command to obtain a dynamic IP dhclient

dhclient command uses Dynamic Host Configuration Protocol configuring network interfaces dynamic network parameters.

grammar	dhclient (option) (parameters)
Options	0: Specifies the port number dhcp client listening; -d: always run the program in foreground; -q: Quiet mode, do not print any error message; -r: release ip address.
parameter	Network interfaces: network operation
Examples	dhclient -r # release IP dhclient to obtain the IP #

[root@localhost xws]# dhclient -v

After executing ifconfig command again to see the IP