负载均衡，LVS
负载均衡介绍http://i2.运维网.com/images/blog/201804/10/ef922cd7425901a9e9ce8d158f3add49.png
LVS介绍
http://i2.运维网.com/images/blog/201804/10/f3ba5cf24c3fa9590fb90d483a7e417d.png
有三种模式
1.NAT模式，访问量很大的时候分发器就成为瓶颈
http://i2.运维网.com/images/blog/201804/10/219c1a2823c8cd1f1465c8cc93506349.png
2.IP Tunnel模式：
http://i2.运维网.com/images/blog/201804/10/b593d2aedcae3be6170cfa8166eb1c4f.png
3.DR模式
http://i2.运维网.com/images/blog/201804/10/4c8ebb93ae1b2fb3e9a42c78b33a1489.png
LVS的调度算法
http://i2.运维网.com/images/blog/201804/10/55a297f5bfb2b73722d516230e44aa95.png
一共八种，前面四种比较常用，后面用的比较少
LVS NAT模式搭建
http://i2.运维网.com/images/blog/201804/10/627166848232924e98a1793d03b38083.png
1.设置IP地址
分发器：
内网：188.130 外网：252.147（仅主机模式）
rs1
内网：188.129 设置网关 188.130
rs2
内网：188.133 设置网关 188.130
2.关闭防火墙：三台都完成
# iptables -nvL
Chain INPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain FORWARD (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
Chain OUTPUT (policy ACCEPT 0 packets, 0 bytes)
pkts bytes target prot opt in out source destination
3.然后三台机器开启iptables规则，并且调用空规则：
# systemctl start iptables.service
# iptables -F
# service iptables save
iptables: Saving firewall rules to /etc/sysconfig/iptables:[确定]
http://i2.运维网.com/images/blog/201804/10/6139fe887ae4a364c07b2b51385d26aa.png
4.安装工具：只在dir上
# yum install -y ipvsadm
已加载插件：fastestmirror
base | 3.6 kB00:00:00
5.编辑脚本：在dir上
# vim /usr/local/sbin/lvs_nat.sh
#! /bin/bash
# director 服务器上开启路由转发功能
echo 1 > /proc/sys/net/ipv4/ip_forward
# 关闭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
# 注意区分网卡名字，阿铭的两个网卡分别为ens33和ens37
echo 0 > /proc/sys/net/ipv4/conf/ens33/send_redirects
echo 0 > /proc/sys/net/ipv4/conf/ens37/send_redirects
# director 设置nat防火墙
iptables -t nat -F
iptables -t nat -X
iptables -t nat -A POSTROUTING -s 192.168.188.0/24-j MASQUERADE
# director设置ipvsadm
IPVSADM='/usr/sbin/ipvsadm'
$IPVSADM -C
$IPVSADM -A -t 192.168.252.147:80 -s lc -p 3
$IPVSADM -a -t 192.168.252.147:80 -r 192.168.188.129:80 -m -w 1
$IPVSADM -a -t 192.168.252.147:80 -r 192.168.188.133:80 -m -w 1
6.编辑两个rs上的默认页，做区分：
# vi /usr/share/nginx/html/index.html
# curl localhost
weixing02
# curl localhost
weixing03
7.编辑配置文件：
$IPVSADM -A -t 192.168.252.147:80 -s rr 更改规则为rr
$IPVSADM -a -t 192.168.252.147:80 -r 192.168.188.129:80 -m -w 1
$IPVSADM -a -t 192.168.252.147:80 -r 192.168.188.133:80 -m -w 1
8.进行测试：
# curl 192.168.252.147
weixing03
# curl 192.168.252.147
weixing02
# curl 192.168.252.147
weixing03
# curl 192.168.252.147
weixing02
# curl 192.168.252.147
weixing03
# curl 192.168.252.147
weixing02
页:
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