This is my Centos 7 version:
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[root@rosen lucumt]# uname -a
Linux rosen 3.10.0-693.21.1.el7.x86_64 #1 SMP Wed Mar 7 19:03:37 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
[root@rosen lucumt]# lsb_release
LSB Version: :core-4.1-amd64:core-4.1-noarch:cxx-4.1-amd64:cxx-4.1-noarch:desktop-4.1-amd64:desktop-4.1-noarch:languages-4.1-amd64:languages-4.1-noarch:printing-4.1-amd64:printing-4.1-noarch
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[root@rosen lucumt]# lsusb
Bus 002 Device 002: ID 8087:8000 Intel Corp.
Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 8087:8008 Intel Corp.
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 004 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
Bus 003 Device 003: ID 093a:2510 Pixart Imaging, Inc. Optical Mouse
Bus 003 Device 002: ID 0bda:8179 Realtek Semiconductor Corp. RTL8188EUS 802.11n Wireless Network Adapter
Bus 003 Device 004: ID 04d9:1702 Holtek Semiconductor, Inc. Keyboard LKS02
Bus 003 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Using lsmodand the output is below,so I think the rtl8188 driver is installed success.
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[root@rosen lucumt]# lsmod |grep 8188
8188eu 768700 0
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[root@rosen lucumt]# ifconfig -a
enp3s0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.1.40 netmask 255.255.255.0 broadcast 192.168.1.255
inet6 fe80::4216:7eff:fee8:3e12 prefixlen 64 scopeid 0x20<link>
ether 40:16:7e:e8:3e:12 txqueuelen 1000 (Ethernet)
RX packets 322691 bytes 362079820 (345.3 MiB)
RX errors 0 dropped 450 overruns 0 frame 0
TX packets 117935 bytes 18881791 (18.0 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
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 1 (Local Loopback)
RX packets 416278 bytes 495254973 (472.3 MiB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 416278 bytes 495254973 (472.3 MiB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlp0s20u3: flags=4098<BROADCAST,MULTICAST> mtu 1500
inet 192.168.1.5 netmask 255.255.255.0 broadcast 192.168.1.255
ether 08:57:00:33:df:e7 txqueuelen 1000 (Ethernet)
RX packets 0 bytes 167708850 (159.9 MiB)
RX errors 0 dropped 1617 overruns 0 frame 0
TX packets 0 bytes 13670706 (13.0 MiB)
TX errors 0 dropped 1 overruns 0 carrier 0 collisions 0
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[root@rosen lucumt]# iwlist wlp0s20u3 scan|grep ADyS
ESSID:"CMCC-ADyS"
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[root@rosen lucumt]# iwconfig
wlp0s20u3 IEEE 802.11bgn ESSID:"CMCC-ADyS" Nickname:"<WIFI@REALTEK>"
Mode:Managed Frequency:2.462 GHz Access Point: 04:25:C5:26:0F:44
Bit Rate:72.2 Mb/s Sensitivity:0/0
Retry:off RTS thr:off Fragment thr:off
Encryption key:****-****-****-****-****-****-****-**** Security mode:open
Power Management:off
Link Quality=69/100 Signal level=-50 dBm Noise level=0 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:0 Invalid misc:0 Missed beacon:0
lo no wireless extensions.
enp3s0 no wireless extensions.
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[root@rosen lucumt]# wpa_supplicant -B -i wlp0s20u3 -c /etc/wpa_supplicant/wpa_supplicant.conf -D wext
Successfully initialized wpa_supplicant
rfkill: Cannot get wiphy information
ioctl[SIOCSIWAP]: Operation not permitted
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root@rosen lucumt]# dhclient wlp0s20u3
dhclient(29548) is already running - exiting.
This version of ISC DHCP is based on the release available
on ftp.isc.org. Features have been added and other changes
have been made to the base software release in order to make
it work better with this distribution.
Please report for this software via the CentOS Bugs Database:
http://bugs.centos.org/
exiting.
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[root@rosen lucumt]# nmcli dev wifi list
[root@rosen lucumt]#
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[root@rosen lucumt]# dmesg|grep 8188eu
[ 0.934858] 8188eu: loading out-of-tree module taints kernel.
[ 0.934879] WARNING: module '8188eu' built without retpoline-enabled compiler, may affect Spectre v2 mitigation
[ 0.935127] 8188eu: module verification failed: signature and/or required key missing - tainting kernel
[ 0.958911] usbcore: registered new interface driver r8188eu