LVS+keepalived配置备忘

文章由LinuxBoy分享于2019-03-24 04:03:00热评（630）

LVS+keepalived配置备忘

LVS + keepalived实现负载均衡的文档很多，这里不再重复说明，只记录在配置过程中容易忘记的地方。

1. 确保IP转发功能开启

Shell代码

# sysctl -a | grep ip_forward

net.ipv4.ip_forward = 1

方法有san种

1）sysctl net.ipv4.ip_forward=1

2) echo "1" > /proc/sys/net/ipv4/ip_forward

3) 修改sysctl.conf, net.ipv4.ip_forward = 1, 执行sysctl -p命令

2. virtual ip的配置

keepalived 采用RD转发模式

测试拓扑结构

linux director

ip：192.168.1.199

vip：192.168.1.210

+++++++++++++++++++++++++++++++++++++++++++++++++++++++++

| |

real server real server

ip: 192.168.1.13 ip: 192.168.1.14

vip: 192.168.1.210 vip: 192.168.1.210

lvs客户端也就是real server的vip，要和linux director的vip保持一致

lvs-real.sh

Shell代码

#!/bin/bash

VIP=192.168.1.210

/etc/rc.d/init.d/functions

case "$1" in

start)

ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP

/sbin/route add -host $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:0 down

route del $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

linux director上keepalived.conf

Shell代码

! Configuration File for keepalived

global_defs {

notification_email {

#huaying@staff.sina.com.cn

}

#notification_email_from Alexandre.Cassen@firewall.loc

#smtp_server 127.0.0.1

#smtp_connect_timeout 30

router_id LVS_DEVEL

}

virtual_server 192.168.1.210 80 {

delay_loop 3

lb_algo rr

lb_kind DR

persistence_timeout 120

protocol TCP

real_server 192.168.1.13 80 {

weight 100

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

real_server 192.168.1.14 80 {

weight 100

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

说明：由于是测试lvs负责均衡功能，没有配置vrrp_instance，在实际应用中，可以配置双linux director。所以在linux director上手工添加vip：192.168.1.210，可以使用如下方法

Shell代码

# ip addr add 192.168.1.210 dev eth0

3. keepalived DR转发模式，需要将real server的ip与virtual ip设定在同一个网段

4. linux director 需要安装ipvsadm，当ipvsadm启动后可以查看它是否被加载

Shell代码

# lsmod | grep ip_vs

ip_vs 94742 5

#lpvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.1.210:80 rr persistent 120

-> 192.168.1.13:80 Route 100 0 0

-> 192.168.1.14:80 Route 100 0 0

5. 如果配置都正确，需要考虑是否将ipvs框架编译进keepalived

6. 如还不行，考虑其它原因

XXX TODO：NAT转发模式的配置再测试

推荐文章：

LVS+keepalived配置备忘