配置一台机器时，沿袭了原有网口配置，修改网口名，把em1全部修改改为eth0
mv ifcfg-em1 ifcfg-eth0
mv ifcfg-em2 ifcfg-eth1
改完以后，机器变得不稳定，经常卡住，启动时报错：
解决这个问题的过程中遇到3个问题：
1、备份的网口配置文件没有删除
ifcfg-em1_bak ifcfg-em2_bak ifcfg-em3 ifdown-bnep ifdown-ppp ifup-bnep ifup-plusb ifup-wireless ifcfg-em4 ifdown-eth ifdown-routes ifup-eth ifup-post init.ipv6-global ifcfg-eth0 ifdown-ippp ifdown-sit ifup-ippp ifup-ppp net.hotplug ifcfg-eth1 ifdown-ipv6 ifdown-tunnel ifup-ipv6 ifup-routes network-functions ifcfg-lo ifdown-isdn ifup ifup-isdn ifup-sit network-functions-ipv6
2、两个网口都配置了默认路由，导致第二个路由创建失败。
解决办法：删除第二个网口的默认路由，在/etc/rc.local文件中加入一条永久路由：
[root@jiexi5 sysconfig]# cat /etc/rc.local #!/bin/sh # # This script will be executed *after* all the other init scripts. # You can put your own initialization stuff in here if you don't # want to do the full Sys V style init stuff. touch /var/lock/subsys/local #route add default gw 10.204.250.1 dev eth0 route add -net 10.0.0.0/8 gw 10.204.250.1
https://www.cnblogs.com/ssgeek/p/9220690.html
3、eth1网口的名称出错
4、启动后只能进图形界面，想改成命令行界面
使用命令： vi /etc/inittab
id:5:initdefault:
中的5 改成3 即可：
id:3:initdefault:
然后wq保存，重启OK。
https://www.cnblogs.com/wi100sh/p/4201031.html
[root@jiexi5 sysconfig]# cat /etc/inittab # inittab is only used by upstart for the default runlevel. # # ADDING OTHER CONFIGURATION HERE WILL HAVE NO EFFECT ON YOUR SYSTEM. # # System initialization is started by /etc/init/rcS.conf # # Individual runlevels are started by /etc/init/rc.conf # # Ctrl-Alt-Delete is handled by /etc/init/control-alt-delete.conf # # Terminal gettys are handled by /etc/init/tty.conf and /etc/init/serial.conf, # with configuration in /etc/sysconfig/init. # # For information on how to write upstart event handlers, or how # upstart works, see init(5), init(8), and initctl(8). # # Default runlevel. The runlevels used are: # 0 - halt (Do NOT set initdefault to this) # 1 - Single user mode # 2 - Multiuser, without NFS (The same as 3, if you do not have networking) # 3 - Full multiuser mode # 4 - unused # 5 - X11 # 6 - reboot (Do NOT set initdefault to this) # id:3:initdefault:
以下是两个网口最初的配置：
网口eth0
DEVICE="eth0" TYPE=Ethernet UUID=04b70242-2f07-450a-b69d-4b05a9cf911a ONBOOT=yes NM_CONTROLLED=yes BOOTPROTO=none HWADDR=14:18:77:40:CC:EB IPADDR=192.168.3.37 PREFIX=24 GATEWAY=192.168.3.1 DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="System eth0"
网口eth1
[root@jiexi5 sysconfig]# cd network-scripts/ DEVICE="eth1" TYPE=Ethernet BOOTPROTO=none IPADDR=10.204.250.20 PREFIX=24 GATEWAY=10.204.250.1 DEFROUTE=yes IPV4_FAILURE_FATAL=yes IPV6INIT=no NAME="system eth1" UUID=06878ed9-2826-4873-87ab-c2355d260671 ONBOOT=yes
GATEWAY=10.204.250.1
DEFROUTE=yes
route命令可以添加动态路由，但重启后失效