HWaddr UUID

1 查看系统网卡对应的硬件地址HWADDR：
# ifconfig | grep HWaddr
br100     Link encap:Ethernet  HWaddr 00:25:90:F0:05:8D  
eth0      Link encap:Ethernet  HWaddr 00:25:90:F0:05:8C  
eth1      Link encap:Ethernet  HWaddr 00:25:90:F0:05:8D  
virbr0    Link encap:Ethernet  HWaddr 52:54:00:F3:BE:46  
vnet0     Link encap:Ethernet  HWaddr FE:16:3E:A0:2A:19  
vnet1     Link encap:Ethernet  HWaddr FE:16:3E:AA:D1:6B  
vnet2     Link encap:Ethernet  HWaddr FE:16:3E:F4:01:E4  
vnet3     Link encap:Ethernet  HWaddr FE:16:3E:F0:E3:F6  
vnet4     Link encap:Ethernet  HWaddr FE:16:3E:6F:F7:16
怎样查看识别码UUID

2 硬盘或者虚拟机迁移后会重启network，报错：
　Restarting network (via systemctl):  Job for network.service failed. See 'systemctl status network.service' and 'journalctl -xn' for details.
定位：配置文件中的HWADDR（即网卡的MAC地址）与实际网卡地址不符（迁移虚拟机时只复制了虚拟机磁盘，系统会给新虚拟机重新分配MAC地址），查找到新的MAC地址并改正确就好了。
使用ip addr查找指定网卡的新的MAC地址，更改即可。

[root@compute_power ~]# cat /etc/sysconfig/network-scripts/ifcfg-enP3p9s0f0
# Generated by IBM powerkvm installer
IPADDR=192.168.8.56
GATEWAY=192.168.8.254
HWADDR=40:f2:e9:5a:f6:88
NETMASK=255.255.255.0
BOOTPROTO=static
DEVICE=enP3p9s0f0
TYPE=Ethernet
ONBOOT=yes

[root@compute_power ~]# ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host
       valid_lft forever preferred_lft forever
2: enP3p9s0f0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq state UP group default qlen 1000
    link/ether 40:f2:e9:5a:f6:88 brd ff:ff:ff:ff:ff:ff
    inet 192.168.8.56/24 brd 192.168.8.255 scope global enP3p9s0f0
       valid_lft forever preferred_lft forever
    inet6 fe80::42f2:e9ff:fe5a:f688/64 scope link
       valid_lft forever preferred_lft forever
3: enP3p5s0f1: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 40:f2:e9:5a:f6:89 brd ff:ff:ff:ff:ff:ff
4: enP3p5s0f2: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 40:f2:e9:5a:f6:8a brd ff:ff:ff:ff:ff:ff
5: enP3p5s0f3: <BROADCAST,MULTICAST> mtu 1500 qdisc noop state DOWN group default qlen 1000
    link/ether 40:f2:e9:5a:f6:8b brd ff:ff:ff:ff:ff:ff
6: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether ae:43:d8:51:8c:19 brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
7: virbr1: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default
    link/ether 86:1a:27:eb:0a:9d brd ff:ff:ff:ff:ff:ff
    inet 192.168.121.1/24 brd 192.168.121.255 scope global virbr1
       valid_lft forever preferred_lft forever