LB集羣即load balance負載均衡集羣,常用的負載均衡軟件有nginx、LVS、keepalived,商業硬件負載設備F5、Netsale
LVS的三種工作模式:1.VS/NAT模式(Network address translation)2.VS/TUN模式(tunneling) 3.DR模式(Direct routing)
命令提要:
ipvsadm -ln 在DR1上運行,用於查看當前集羣規則
測試環境:
Hostname | Eth0 (內網IP) | Eth1 (公網IP) |
DR1 | 192.168.137.100 | 192.168.137.33 |
RS1 | 192.168.137.111 | |
RS2 | 192.168.137.122 |
一、 NAT模式設置:
在DR1上配置:
vim /usr/local/sbin/lvs_nat.sh
#! /bin/bash
# director 服務器上開啓路由轉發功能:
echo 1 > /proc/sys/net/ipv4/ip_forward
# 關閉icmp的重定向
echo 0 > /proc/sys/net/ipv4/conf/all/send_redirects
echo 0 > /proc/sys/net/ipv4/conf/default/send_redirects
echo 0 > /proc/sys/net/ipv4/conf/eth0/send_redirects
echo 0 > /proc/sys/net/ipv4/conf/eth1/send_redirects
# director 設置nat防火牆
iptables -t nat -F
iptables -t nat -X
iptables -t nat -A POSTROUTING -s 192.168.137.0/24 -j MASQUERADE
# director設置ipvsadm
IPVSADM='/sbin/ipvsadm'
$IPVSADM -C
$IPVSADM -A -t 192.168.137.33:80 -s lc -p 300
##lc表示最小連接數
$IPVSADM -a -t 192.168.137.33:80 -r 192.168.137.111:80 -m -w 1
$IPVSADM -a -t 192.168.137.33:80 -r 192.168.137.122:80 -m -w 1
sh !$
RS1以及RS2上運行nginx服務
二、DR模式
vim /usr/local/sbin/lvs_dr.sh
#! /bin/bash
echo 1 > /proc/sys/net/ipv4/ip_forward
ipv=/sbin/ipvsadm
vip=192.168.137.88
RS1=192.168.137.111
RS2=192.168.137.122
ifconfig eth1:0 down
ifconfig eth1:0 $vip broadcast $vip netmask 255.255.255.255 up
##需要綁定公網網卡
route add -host $vip dev eth0:0
$ipv -C
$ipv -A -t $vip:80 -s wrr
##w參數用於加權
$ipv -a -t $vip:80 -r $RS1:80 -g -w 2
$ipv -a -t $vip:80 -r $RS2:80 -g -w 1
在RS1以及RS2上做同樣的配置:
vi /usr/local/sbin/lvs_rs.sh
#! /bin/bash
vip=192.168.137.88
ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip 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
先執行DR1上的腳本,後執行RS上的腳本即可