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centos7不能启动网卡报No suitable device found for this connection错误

　
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centos7不能启动网卡报No suitable device found for this connection错误
错误1：

ifup ens33 显示
Error: Connection activation failed: No suitable device found for this connection.

错误2：

systemctl restart network 显示：
Job for network.service failed because the control process exited with error code. See "systemctl status network.service" and "journalctl -xe" for details.

日志文件/var/log/meesage显示

Sep 20 11:21:52 centos129 NetworkManager[624]: <info>  [1505877712.6949] audit: op="connection-activate" uuid="c96bc909-188e-ec64-3a96-6a90982b08ad" name="ens33" result="fail" reason="No suitable device found for this connection."
Sep 20 11:21:52 centos129 network: Bringing up interface ens33:  Error: Connection activation failed: No suitable device found for this connection.
Sep 20 11:21:52 centos129 network: [FAILED]

上面报的两个错误
错误1 是mac地址出问题，通命令ip a 找到mac地址

[root@centos128 /]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:87:9d:51 brd ff:ff:ff:ff:ff:ff
    inet 192.168.44.128/24 brd 192.168.44.255 scope global ens33
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
    link/ether 02:42:47:9a:32:9e brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 scope global docker0
       valid_lft forever preferred_lft forever

其中ether 00:0c:29:87:9d:51 就是网卡ens33的mac地址

错误2 是 网卡设备的uuid问题
运行命令发现如下信息

ifup ens33
Error: Connection activation failed: No suitable device found for this connection.

查看脚本ifup 发现错误代码源于如下

echo 'a75'
    [ -n "${DEVICE}" ] && is_nm_handling ${DEVICE} && exit 0
    echo "[ -n "${DEVICE}" ] && is_nm_handling ${DEVICE} && exit 0"
    echo "$UUID"
    nmcli con up uuid "$UUID"

运行如下一行命令得得同新的错

nmcli con up uuid "$UUID"

其中 UUID值的生成来于ifup脚本加载的/etc/sysconfig/network-scripts/network-functions脚本，network-functions中的的函数get_uuid_by_config ()

get_uuid_by_config ()
{
    dbus-send --system --print-reply --dest=com.redhat.ifcfgrh1 /com/redhat/ifcfgrh1 com.redhat.ifcfgrh1.GetIfcfgDetails string:"/etc/sysconfig/network-scripts/$1" 2>/dev/null | awk -F '"' '/string / { print $2 }'
}

修改$1为ifcfg-ens33运行如下

 dbus-send --system --print-reply --dest=com.redhat.ifcfgrh1 /com/redhat/ifcfgrh1 com.redhat.ifcfgrh1.GetIfcfgDetails string:"/etc/sysconfig/network-scripts/ifcfg-ens33" 2>/dev/null

得到uuid:

string "c96bc909-188e-ec64-3a96-6a90982b08ad"
object path "/org/freedesktop/NetworkManager/Settings/1"

其中c96bc909-188e-ec64-3a96-6a90982b08ad就是dbus-send生成的UUID

那么运行一下

nmcli con up uuid "$UUID"
nmcli con up uuid  "c96bc909-188e-ec64-3a96-6a90982b08ad"

会得到如下报错信息

Error: Connection activation failed: No suitable device found for this connection.

解决办法：
配置文件/etc/sysconfig/network-scripts/ifcfg-ens33 中添加正确的mac地址和新的uuid
注意，uuid 不要为空，为空就会运dbus-send生成的UUID，系统生成UUID此时是不可用的（具体什么原因我也不知道的），只随便生成一个UUID就行的
如下

[root@centos129 network-scripts]# cat /etc/sysconfig/network-scripts/ifcfg-ens33
TYPE=Ethernet
#BOOTPROTO=dhcp
DEFROUTE=yes
#IPV4_FAILURE_FATAL=no
NAME=ens33
HWADDR="00:0C:29:E6:B5:68"
UUID="c96bc909-188e-ec64-3a96-6a90982b08az"
DEVICE=ens33
ONBOOT=yes
#DNS1=192.168.44.2
BOOTPROTO=static
IPADDR=192.168.44.129
PREFIX=24
GATEWAY=192.168.44.2
#IPV6INIT=no

启动网卡

ifup ens33
ifconfig -a
[root@centos129 network-scripts]# ifconfig -a
docker0: flags=4099<UP,BROADCAST,MULTICAST>  mtu 1500
        inet 172.17.0.1  netmask 255.255.0.0  broadcast 0.0.0.0
        ether 02:42:ae:fe:6c:f6  txqueuelen 0  (Ethernet)
        RX packets 0  bytes 0 (0.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 0  bytes 0 (0.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
        inet 192.168.44.129  netmask 255.255.255.0  broadcast 192.168.44.255
        inet6 fe80::20c:29ff:fee6:b568  prefixlen 64  scopeid 0x20<link>
        ether 00:0c:29:e6:b5:68  txqueuelen 1000  (Ethernet)
        RX packets 1656  bytes 141293 (137.9 KiB)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 1145  bytes 455981 (445.2 KiB)
        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 6  bytes 600 (600.0 B)
        RX errors 0  dropped 0  overruns 0  frame 0
        TX packets 6  bytes 600 (600.0 B)
        TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

[root@centos129 network-scripts]# ip a
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN qlen 1
    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: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
    link/ether 00:0c:29:e6:b5:68 brd ff:ff:ff:ff:ff:ff
    inet 192.168.44.129/24 brd 192.168.44.255 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fee6:b568/64 scope link
       valid_lft forever preferred_lft forever
3: docker0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN
    link/ether 02:42:ae:fe:6c:f6 brd ff:ff:ff:ff:ff:ff
    inet 172.17.0.1/16 scope global docker0
       valid_lft forever preferred_lft forever

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