CentOS7 增加回环地址
添加回环地址的命令和说明如下:
#添加一个回环地址到lo网卡,添加多个可以改lo:后边的序号 ifconfig lo:0 [要添加的地址] netmask 255.255.255.255 broadcast [要添加的地址] #增加本地路由 /sbin/route add -host [要添加的地址] dev lo:0 #禁止lo网卡的arp的发出,并屏蔽arp消息 echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce #禁止网卡默认配置的arp的发出,并屏蔽arp消息 echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce #内核运行时动态修改内核参数,从文件中读取配置,可以让配置马上生效 sysctl -p >/dev/null 2>&1
删除回环地址:
ifconfig lo:0 down route del $SNS_VIP >/dev/null 2>&1 echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
实例脚本一枚:
SNS_VIP=$2 SNS_VIP_INDEX=$3 #/etc/rc.d/init.d/functions case "$1" in start) ifconfig lo:${SNS_VIP_INDEX:-0} $SNS_VIP netmask 255.255.255.255 broadcast $SNS_VIP /sbin/route add -host $SNS_VIP dev lo:0 echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce sysctl -p >/dev/null 2>&1 echo "RealServer Start OK" ;; stop) ifconfig lo:${SNS_VIP_INDEX:-0} down route del $SNS_VIP >/dev/null 2>&1 echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce echo "RealServer Stoped" ;; *) echo "Usage: $0 {start|stop}" exit 1 esac exit 0
使用方法:
在CentOS7中随便编辑个文件,贴上以上内容,并执行 chmod +x [文件名],使该文件具备执行权限。
脚本命令示例:
#增加 ./[文件名] start 192.168.1.110 #删除 ./[文件名] stop 192.168.1.110 #增加第二个(第N个类似,需要把最后数字变成N-1),后边多了个数字,删除的时候也要对应起来 ./[文件名] start 192.168.1.111 1 #删除 ./[文件名] stop 192.168.1.111 1 #查看效果,可以看到lo网卡上绑定了多个回环IP ip a