Centos7虚拟机克隆及克隆之后无法上网问题解决

项目场景：

CentOS7虚拟机在VMware Workstation中克隆之后无法访问网络问题解决

问题描述

Centos7虚拟机克隆及克隆之后无法上网问题解决：

# 网卡异常，ip丢失
[root@gitlab ~]# ip add | grep ens33
2: ens33: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 00:0c:29:19:d8:66 brd ff:ff:ff:ff:ff:ff
[root@gitlab ~]# dig google.com

; <<>> DiG 9.11.4-P2-RedHat-9.11.4-9.P2.el7 <<>> google.com
;; global options: +cmd
;; connection timed out; no servers could be reached
[root@gitlab ~]# ping 223.5.5.5
connect: Network is unreachable

原因分析：

解决方案：

# 生产新的网卡UUID
[root@gitlab ~]# uuidgen 
bcd504e7-48c0-4fcf-8de0-8d06f006e1a0


添加修改网卡MAC物理地址和UUID
[root@gitlab ~]# cat /etc/sysconfig/network-scripts/ifcfg-ens33 
HWADDR=00:0C:29:19:D8:66
UUID=bcd504e7-48c0-4fcf-8de0-8d06f006e1a0

# 重启网卡
[root@gitlab ~]# systemctl stop NetworkManager
[root@gitlab ~]# systemctl disable NetworkManager
Removed symlink /etc/systemd/system/multi-user.target.wants/NetworkManager.service.
Removed symlink /etc/systemd/system/dbus-org.freedesktop.nm-dispatcher.service.
Removed symlink /etc/systemd/system/network-online.target.wants/NetworkManager-wait-online.service.
[root@gitlab ~]# systemctl restart network

[root@gitlab ~]# ip add | grep ens33
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP group default qlen 1000
    link/ether 00:0c:29:19:d8:66 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.81/24 brd 192.168.122.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe19:d866/ scope link 
       valid_lft forever preferred_lft forever