Linux系统网卡识别不到怎么办
1)现象说明
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一台线上服务器硬件报警，最后排查发现服务器主板坏了，随即联系厂商进行更换主板，最后更换后，登录服务器，发现网卡绑定及ip信息都在，但是ip却ping不通了，进一步排查，重启网卡，提示之前的eth0和eth1网卡设备发现不了了，也就是说服务器主板更换后，之前的网卡设备都识别不了了!
主板更换后，重启并登陆服务器，发现之前的网卡设备(eth0、eth1、eth2、eth3)都没有了!
[root@kevin01 ~] # ifconfig -a bond 0 Link encap:Ethernet HWaddr 08 : 94 :EF : 5 E: AE:72 inet addr: 192.168. 10.20 Bcast: 192.168. 10.255 Mask: 255.255. 255.0 inet6 addr:fe80:: a94: efff: fe5e:ae72/ 64 Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU: 1500 Metric: 1 RX packets: 75582 errors: 0 dropped: 0 overruns: 0frame: 0 TX packets: 58537 errors: 0 dropped: 0 overruns: 0 carrier: 0 collisions: 0txqueuelen: 0 RX bytes: 5890233 ( 5.6 MiB) TX bytes: 4390537 ( 4.1 MiB) lo Link encap:Local Loopback inet addr: 127.0. 0. 1 Mask: 255.0. 0. 0 inet6 addr: : : 1/ 128Scope:Host UP LOOPBACK RUNNING MTU: 65536 Metric: 1 RX packets: 26 errors: 0dropped: 0 overruns: 0 frame: 0 TX packets: 26 errors: 0 dropped: 0 overruns: 0 carrier: 0collisions: 0 txqueuelen: 0 RX bytes: 1983 ( 1.9 KiB) TX bytes: 1983 ( 1.9 KiB) usb 0 Link encap:Ethernet HWaddr 0 A: 94 :EF : 5 E: AE: 79 BROADCAST MULTICAST MTU: 1500Metric: 1 RX packets: 0 errors: 0 dropped: 0 overruns: 0 frame: 0 TX packets: 0 errors: 0dropped: 0 overruns: 0 carrier: 0 collisions: 0 txqueuelen: 1000 RX bytes: 0 ( 0. 0 b) TX bytes: 0 ( 0. 0 b)
之前的网卡设备和bond绑定的配置信息都还在(bond绑定网卡操作：http://www.cnblogs.com/kevingrace/p/7966511.html)
[root@kevin ~] # cd /etc/sysconfig/network-s/ [root@kevin network-s] # ls ifcfg-bond0 ifcfg-lo ifdown-ib ifdown-ppp ifup-aliases ifup-ipv6 ifup-ppp init.ipv6- global ifcfg-eth0 ifcfg-usb0 ifdown-ippp ifdown-routes ifup-bnep ifup-isdn ifup-routes net.hotplug ifcfg-eth1 ifdown ifdown-ipv6 ifdown-sit ifup-eth ifup-plip ifup-sit network-functions ifcfg-eth2 ifdown-bnep ifdown-isdn ifdown-tunnel ifup-ib ifup-plusb ifup-tunnel network-functions-ipv6 ifcfg-eth3 ifdown-eth ifdown-post ifup ifup-ippp ifup-post ifup-wireless [root@kevin ~] # /etc/init.d/network restart ......
报错说没有发现eth0和eth1网卡
[root@kevin ~] # ipdown eth0
报错提示说没有发现eth0网卡
2)产生原因
这是因为服务器更换了主板或网卡，mac地址改变所导致的。系统加载网卡驱动后会去读一个文件(即/etc/udev/rules.d/70-persistent-net.rules)，这个文件是一个缓冲文件，包含了网卡的mac地址，因为更换了主板，网卡的mac地址也变了，但是这个文件的mac地址还没变，还是之前坏了的主板的上面的网卡的MAC地址，这样系统在加载网卡，读取这个文件的时候读取的是之前网卡的mac地址，和现在更换后主板后的网卡mac地址不一致导致混乱，所以就识别不了当前网卡;
3)解决办法
一般来说，删除/etc/udev/rules.d/70-persistent-net.rules文件(或者把这个文件重新命名)，重启服务器就可以解决了，重启后会重新生成这个文件，这样就顺利解决这个问题了!这里注意下，由于这台服务器绑定了网卡，所以重启网卡后，还需要进行modprobe命令使得网卡绑定生效，大致步骤如下：
# mv /etc/udev/rules.d/70-persistent-net.rules /etc/udev/rules.d/70-persistent-net.rules.bak20180307 # init 6
重启服务器后，查看/etc/udev/rules.d/70-persistent-net.rules文件，发现没有eth0、eth1、eth3、eth4的网卡信息(mac和设备名称)
[root@kevin network-s] # cat /etc/udev/rules.d/70-persistent-net.rules # This file was automatically generated by the /lib/udev/write_net_rules # program, run by the persistent-net-generator.rules rules file. # # You can modify it, as long as you keep each rule on a single # line, and change only the value of the NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. # PCI device 0x14e4:0x1657 (tg3) SUBSYSTEM== "net", ACTION== "add", DRIVERS== "?*", ATTR{address}== "****", ATTR{type}== "1", KERNEL== "eth*" # PCI device 0x14e4:0x1657 (tg3) SUBSYSTEM== "net", ACTION== "add", DRIVERS== "?*", ATTR{address}== "****", ATTR{type}== "1", KERNEL== "eth*" # PCI device 0x14e4:0x1657 (tg3) SUBSYSTEM== "net", ACTION== "add", DRIVERS== "?*", ATTR{address}== "****", ATTR{type}== "1", KERNEL== "eth*" # PCI device 0x14e4:0x1657 (tg3) SUBSYSTEM== "net", ACTION== "add", DRIVERS== "?*", ATTR{address}== "****", ATTR{type}== "1", KERNEL== "eth*"
然后重启网卡等操作
[root@kevin ~] # modprobe bonding [root@kevin ~] # /etc/init.d/network restart[root@kevin ~] # modprobe bonding 接着ifconfig查看，发现eth 0、eth1、eth2、eth3网卡设备都能识别了 [root@kevin ~] # ifconfig -a bond 0 Link encap:Ethernet HWaddr 08 : 94:EF : 5 E: AE: 72 inet addr: 192.168. 10.20 Bcast: 192.168. 10.255 Mask: 255.255. 255.0inet6 addr: fe80:: a94: efff: fe5e:ae72/ 64 Scope:Link UP BROADCAST RUNNING MASTER MULTICAST MTU: 1500 Metric: 1 RX packets: 108809 errors: 0 dropped: 0overruns: 0 frame: 0 TX packets: 84207 errors: 0 dropped: 0 overruns: 0 carrier: 0collisions: 0 txqueuelen: 0 RX bytes: 8471111 ( 8.0 MiB) TX bytes: 6322341 ( 6.0 MiB) eth 0 Link encap:Ethernet HWaddr 08 : 94 :EF : 5 E: AE: 72 UP BROADCAST RUNNING SLAVE MULTICAST MTU: 1500 Metric: 1 RX packets: 38051 errors: 0 dropped: 0overruns: 0 frame: 0 TX packets: 14301 errors: 0 dropped: 0 overruns: 0 carrier: 0collisions: 0 txqueuelen: 1000 RX bytes: 2869726 ( 2.7 MiB) TX bytes: 944276 ( 922.1KiB) Interrupt: 16 eth1 Link encap:Ethernet HWaddr 08 : 94 :EF : 5 E: AE: 72 UP BROADCAST RUNNING SLAVE MULTICAST MTU: 1500 Metric: 1 RX packets: 69158errors: 0 dropped: 0 overruns: 0 frame: 0 TX packets: 68615 errors: 0 dropped: 0overruns: 0 carrier: 0 collisions: 0 txqueuelen: 1000 RX bytes: 5469647 ( 5.2 MiB) TX bytes: 5279012 ( 5.0 MiB) Interrupt: 17 eth2 Link encap:Ethernet HWaddr 08 : 94 :EF : 5E: AE: 74 BROADCAST MULTICAST MTU: 1500 Metric: 1 RX packets: 0 errors: 0dropped: 0 overruns: 0 frame: 0 TX packets: 0 errors: 0 dropped: 0 overruns: 0 carrier: 0collisions: 0 txqueuelen: 1000 RX bytes: 0 ( 0. 0 b) TX bytes: 0 ( 0. 0 b) Interrupt: 16 eth3 Link encap:Ethernet HWaddr 08 : 94 :EF : 5 E: AE: 75 BROADCAST MULTICAST MTU:1500 Metric: 1 RX packets: 0 errors: 0 dropped: 0 overruns: 0 frame: 0 TX packets: 0errors: 0 dropped: 0 overruns: 0 carrier: 0 collisions: 0 txqueuelen: 1000 RX bytes: 0 ( 0. 0b) TX bytes: 0 ( 0. 0 b) Interrupt: 17 lo Link encap:Local Loopback inet addr: 127.0. 0. 1Mask: 255.0. 0. 0 inet6 addr: : : 1/ 128 Scope:Host UP LOOPBACK RUNNING MTU:65536 Metric: 1 RX packets: 26 errors: 0 dropped: 0 overruns: 0 frame: 0 TX packets: 26errors: 0 dropped: 0 overruns: 0 carrier: 0 collisions: 0 txqueuelen: 0 RX bytes: 1983 ( 1.9KiB) TX bytes: 1983 ( 1.9 KiB) usb 0 Link encap:Ethernet HWaddr 0 A: 94 :EF : 5 E: AE:79 BROADCAST MULTICAST MTU: 1500 Metric: 1 RX packets: 0 errors: 0 dropped: 0overruns: 0 frame: 0 TX packets: 0 errors: 0 dropped: 0 overruns: 0 carrier: 0 collisions: 0txqueuelen: 1000 RX bytes: 0 ( 0. 0 b) TX bytes: 0 ( 0. 0 b)
在查看/etc/udev/rules.d/70-persistent-net.rules文件，发现eth0、eth1、eth2、eth3网卡及其mac地址信息都有了
[root@kevin ~] # cat /etc/udev/rules.d/70-persistent-net.rules # This file was automatically generated by the /lib/udev/write_net_rules # program, run by the persistent-net-generator.rules rules file. # # You can modify it, as long as you keep each rule on a single# line, and change only the value of the NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. _cke_saved_NAME= key. # PCI device 0x14e4:0x1657 (tg3)SUBSYSTEM== "net", ACTION== "add", DRIVERS== "?*", ATTR{address}== "08:94:ef:5e:ae:75", ATTR{type}== "1", KERNEL== "eth*", NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" _cke_saved_NAME= "eth3" # PCI device 0x14e4:0x1657 (tg3) SUBSYSTEM== "net", ACTION== "add", DRIVERS== "?*", ATTR{address}== "08:94:ef:5e:ae:72", ATTR{type}== "1", KERNEL== "eth*", NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" _cke_saved_NAME= "eth0" # PCI device 0x14e4:0x1657 (tg3) SUBSYSTEM== "net", ACTION== "add", DRIVERS== "?*", ATTR{address}== "08:94:ef:5e:ae:73", ATTR{type}== "1", KERNEL== "eth*", NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" _cke_saved_NAME= "eth1" # PCI device 0x14e4:0x1657 (tg3) SUBSYSTEM== "net", ACTION== "add", DRIVERS== "?*", ATTR{address}== "08:94:ef:5e:ae:74", ATTR{type}== "1", KERNEL== "eth*", NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2" _cke_saved_NAME= "eth2"
接着尝试ping其他机器
[root@kevin ~] # ping 192.168.10.23 PING 192.168 .10 .23 ( 192.168 .10 .23) 56( 84) bytes of data. 64 bytes from 192.168 .10 .23: icmp_seq= 1 ttl= 64 time= 0.030 ms 64bytes from 192.168 .10 .23: icmp_seq= 2 ttl= 64 time= 0.016 ms 64 bytes from 192.168.10 .23: icmp_seq= 3 ttl= 64 time= 0.016 ms
如果ping不通的话，多执行下面命令
[root@kevin ~] # modprobe bonding
