CentOS Linux解決Device eth0 does not seem to be present
今天早上打開xshell鏈接虛擬機，突然鏈接不上。然後進入虛擬機執行 ifconfig 或者 ip addr list 命令發現eth0 不見。然後執行重啓網卡命令發現 
解決辦法： 首先，打開/etc/udev/rules.d/70-persistent-net.rules內容如下面例子所示：
# vi /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.
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:8f:89:9
7", ATTR{type}=="1", KERNEL=="eth*", NAME="eth0"
# PCI device 0x1022:0x2000 (pcnet32)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*", ATTR{address}=="00:0c:29:50:bd:1
7", ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"記錄下，eth1網卡的mac地址00:0c:29:50:bd:17 接下來，打開/etc/sysconfig/network-scripts/ifcfg-eth0
# vi /etc/sysconfig/network-scripts/ifcfg-eth0 將 DEVICE="eth0" 改成 DEVICE="eth1" , 將 HWADDR="00:0c:29:8f:89:97" 改成上面的mac地址 HWADDR="00:0c:29:50:bd:17" 最後，重啓網絡 # service network restart 或者 # /etc/init.d/network restart
然後瞬間就滿血復活，xshell鏈接也正常了。
