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Linux centos 安装 MYSQL 5.6.20

Linux 基本命令之文件与目录操作

1. cp  file1 file2 file3 /log 等于 cp file[1-3] /log

2. 符号连接 ln

3. rmdir 删除目录

4. chgrp 修改文件所在组  chgrp -v users log.txt

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LinuxDevice eth0 does not seem to be pres

在VMware里克隆出来的CentOS Linux。。



vmlite虚拟机启动出错,就把这个虚拟机删除掉重新建立,系统虚拟硬盘使用之前的,启动系统后不能上网,通过ifconfig查看网卡没启动,遂启动网卡服务,但是出错,就是:device eth0 does not seem to be present, delaying initialization,然后想到是不是ifcfg-eth0的配置文件里保存了以前的MAC地址,就把这一行删除掉在重启网卡,还是一样的错误,随后网上查了下资料,把/etc/udev/rules.d/70-persistent-net.rules 删除后重启机器就可以了,因为这个文件绑定了网卡和mac地址,所以换了网卡以后MAC地址变了,所以不能正常启动,也可以直接编辑这个配置文件把里面的网卡和mac地址修改乘对应的,不过这样多麻烦,直接删除重启,它会自动生成个。

1、
vi /etc/sysconfig/network-scripts/ifcfg-eth0
ifcfg-eth0的配置文件里保存了以前的MAC地址,就把这一行删除掉在重启网卡

2、
/etc/udev/rules.d/70-persistent-net.rules 删除后重启机器
因为这个文件绑定了网卡和mac地址,所以换了网卡以后MAC地址变了,所以不能正常启动,也可以直接编辑这个配置文件把里面的网卡和mac地址修改乘对应的,不过这样多麻烦,直接删除重启,它会自动生成个。



ifconfig...没有看到eth0.。然后重启网卡又报下面错误。

故障现象:

service network restart
Shutting down loopback insterface:                                                                                                     [  OK  ]
Bringing up loopback insterface:                                                                                                          [  OK  ]
Bringing up interface eth0:  Device eth0 does not seem to be present,delaying initialization.                    [FAILED]

CentOS Linux解决Device eth0 does not seem to be present

解决办法:

首先,打开/etc/udev/rules.d/70-persistent-net.rules内容如下面例子所示:

# 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"

记录下,eth1网卡的mac地址00:0c:29:50:bd:17

接下来,打开/etc/sysconfig/network-scripts/ifcfg-eth0

# vi /etc/sysconfig/network-scripts/ifcfg-eth0

将 DEVICE="eth0"  改成  DEVICE="eth1"  ,
将 HWADDR="00:0c:29:8f:89:97" 改成上面的mac地址  HWADDR="00:0c:29:50:bd:17"

最后,重启网络

# service network restart
或者

# /etc/init.d/network restart

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