1. How to display uuid
2. How to generate uuid
192.168.153.128[root@centos71908network-scripts 09:29]#grep -i uuid= /etc/sysconfig/network-scripts/ifcfg-ens33
UUID="d6f45ee1-e4f9-40d3-8d7f-b8f2edb5161d"
#UUID="d6f45ee9-e4f9-40d3-8d7f-b8f2edb5161d"
192.168.153.128[root@centos71908network-scripts 09:26]#uuidgen ens33
ef964e5a-efb1-4d15-864d-639a1def7e6d
vim /etc/sysconfig/network-scripts/ifcfg-ens33
192.168.153.128[root@centos71908network-scripts 09:34]#grep -i uuid= /etc/sysconfig/network-scripts/ifcfg-ens33
UUID="ef964e5a-efb1-4d15-864d-639a1def7e6d"
#UUID="d6f45ee9-e4f9-40d3-8d7f-b8f2edb5161d"
192.168.153.128[root@centos71908network-scripts 09:34]#nmcli c show
NAME UUID TYPE DEVICE
ens33 d6f45ee1-e4f9-40d3-8d7f-b8f2edb5161d ethernet ens33
192.168.153.128[root@centos71908network-scripts 09:35]#service network restart
Restarting network (via systemctl): [ OK ]
192.168.153.128[root@centos71908network-scripts 09:35]#nmcli c show
NAME UUID TYPE DEVICE
ens33 ef964e5a-efb1-4d15-864d-639a1def7e6d ethernet ens33
3. What is the use of uuid
The uuid in centos is required; uuid is the abbreviation of "Universally Unique Identifier", which is a standard for software construction and a globally unique identifier at the system level. Its function is to make all elements in the distributed system , can have unique identification information, and there is no need to specify the identification information through the central control terminal.