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]

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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

centos 7：network: 正在打开接口 ens33： 错误：激活连接失败：No suitable device found for this connection.

解决使用VMware克隆出来的新虚拟机无法联网的问题

一．背景

   我们安装好了一个虚拟机，我想做分布式集群，想模拟几台服务器，这时就想直接复制已经有的安装好的虚拟机，这样比较省事，不要在重复的安装虚拟机并配置JAVA环境，省掉做同样的事情，这时直接复制，这样之前配置的JAVA环境都有了。

二.问题

   这时我复制好的虚拟机，启动登陆进去（用户名和密码跟之前那台是一样的），修改好IPADDR，然后网卡重启出现问题？

   #service network restart   

   出现问题：Error:No suitable device found: no device found for connection "System eth0"  如图所示：

    

  

 

  #ifup eth0  

  出现: eth0: unknown interface: No such device 这样的问题，网卡都启动不了，出现问题.

 三.解决问题

  

   第一步：我们在界面点击Network Adapter Remove删除网卡，如图所示:

      

第二步：然后添加一个新的网卡，就是点击add，这时跟前面一台的MAC Address 就不一样，如图所示：

第三步： 重新启动虚拟机，然后进入到/etc/udev/rules.d/目录

 #cat  70-persistent-net.rules  

 里面的信息跟我们Network Adapter的MAC Address地址一样，如图所示：

  

第四步：进入/etc/sysconfig/network-scripts/目录

  #vi ifcfg-eth0

  把HWADDR修改成Network Adapter的MAC Address地址一样，如图所示：

   

  第五步：重启网卡，这时就能正常启动，如图所示：

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