Linux双网口配置时重复配置DEFROUTE和GATEWAY

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

linux 路由表设置 之 route 指令详解

https://www.cnblogs.com/baiduboy/p/7278715.html