lvs+HAproxy/nginx+keepalived构造高并发解决方案

目录

1.环境部署

2.在web1搭建ansible安装服务

3.搭建网页

4.部署HAproxy

>配置HAproxy1对应web1，web2

>HAproxy2对应web3，web4

5.部署LVS

LVS1

LVS2

LVS用于多服务器的负载均衡

haproxy支持七层负载均衡，拥有一个功能出色监控页面，实时了解系统当前状态

nginx也是七层负载均衡器，可自动剔除工作不正常的后端服务器

keepalived可防止单点故障，增强可用性

通过这些组件可以搭建出一个小型高并发高可用的web框架

1.环境部署

1)两台LVS、两台HAproxy、四台web
188、187、186、185(web1/2/3/4)
184、189(HAproxy1/2)
191、190(lvs1/2)
2)全部关闭防火墙，selinux

2.在web1搭建ansible安装服务

1）yum install -y epel-release

2）yum install -y ansible
3）做ssh-key免密

4）做域名解析 
vim /etc/hosts
192.168.171.188 web1
192.168.171.187 web2
192.168.171.186 web3
192.168.171.185 web4

5）去掉(yes/no)询问
vim /etc/ssh/ssh_config
StrictHostKeyChecking no
systemctl restart sshd --重启进程

6）定义主机清单
vim /etc/ansible/hosts
web[1:4] ansible_ssh_user='root' ansible_ssh_pass='111123'

7）后续我们优化网站，使它不再单调

3.搭建网页

1)
ansible webserver -m shell -a 'yum install -y nginx &systemctl start nginx ' -o

2）每台web服务器都执行
rm -rf /usr/share/nginx/html/*
echo web1 > /usr/share/nginx/html/index.html

4.部署HAproxy

>配置HAproxy1对应web1，web2

1)
yum install -y epel-release  haproxy 

2)
vim /etc/haproxy/haproxy.cfg
global
log 127.0.0.1 local3 info
maxconn 4096
user nobody
group nobody
daemon
nbproc 1
pidfile /run/haproxy.pid
​
defaults
        log global
        mode http
        maxconn 2048
        retries 3
        option redispatch
        contimeout 5000
        clitimeout 50000
        srvtimeout 50000
​
        option abortonclose
​
​
        stats uri /admin?status
        stats realm Private lands
        stats auth admin:password
        stats hide-version
​
​
frontend http-in
​
        bind 0.0.0.0:80
        mode http
        log global
        option httplog
        option httpclose
​
acl html url_reg -i \.html$
use_backend html-server if html
default_backend html-server
​
backend html-server
        mode http
        balance roundrobin
        option httpchk GET /index.html
        cookie SERVERID insert indirect nocache
        server html-A web1:80 weight 1 cookie 3 check inter 2000 rise 2 fall 5
        server html-B web2:80 weight 1 cookie 4 check inter 2000 rise 2 fall 5

 这里的配置分成五部分

1>global：设置全局配置参数

2>default：默认配置参数

3>frontend：接收请求的前端虚拟节点

4>backend：后端服务器集群配置，真实服务器

5>Listen：frontend和backend结合体

3)
vim /etc/hosts
192.168.171.184 haproxy1
192.168.171.188 web1
192.168.171.187 web2
4)
scp /etc/hosts 192.168.171.189:/etc/hosts
在192.168.171.189上修改vim /etc/hosts
192.168.171.189 haproxy2
192.168.171.186 web3
192.168.171.185 web4
5)
scp /etc/haproxy/haproxy.cfg   192.168.171.189:/etc/haproxy/haproxy.cfg
在192.168.171.189上修改vim /etc/haproxy/haproxy.cfg
server html-A web3:80 weight 1 cookie 3 check inter 2000 rise 2 fall 5
server html-B web4:80 weight 1 cookie 4 check inter 2000 rise 2 fall 5
6） 
cp /etc/sysconfig/network-scripts/ifcfg-lo /etc/sysconfig/network-scripts/ifcfg-lo:0           --备份一份
7)
vim /etc/sysconfig/network-scripts/ifcfg-lo:0   --配置虚拟地址
DEVICE=lo:0
IPADDR=192.168.171.199
NETMASK=255.255.255.255
ONBOOT=yes
# If you're having problems with gated making 127.0.0.0/8 a martian,
# you can change this to something else (255.255.255.255, for example)
8）
vim /etc/rc.local         --配置路由
/sbin/route add -host 192.168.171.199 dev lo:0
9）
vim /etc/sysctl.conf     --配置ARP
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.default.arp_ignore = 1
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2

10）reboot

>HAproxy2对应web3，web4

1)
yum install -y epel-release haproxy 

2） 
cp /etc/sysconfig/network-scripts/ifcfg-lo /etc/sysconfig/network-scripts/ifcfg-lo:0           --备份一份
3）--配置虚拟地址
vim /etc/sysconfig/network-scripts/ifcfg-lo:0
DEVICE=lo:0
IPADDR=192.168.171.199
NETMASK=255.255.255.255
ONBOOT=yes
# If you're having problems with gated making 127.0.0.0/8 a martian,
# you can change this to something else (255.255.255.255, for example)
4） --配置路由
vim /etc/rc.local
/sbin/route add -host 192.168.171.199 dev lo:0
5） --配置ARP
vim /etc/sysctl.conf
net.ipv4.conf.all.arp_ignore = 1
net.ipv4.conf.all.arp_announce = 2
net.ipv4.conf.default.arp_ignore = 1
net.ipv4.conf.default.arp_announce = 2
net.ipv4.conf.lo.arp_ignore = 1
net.ipv4.conf.lo.arp_announce = 2
6）reboot

5.部署LVS

两台lvs部署一样操作，LVS1做master结点，LVS2做BACKUP结点

LVS1

1）
yum install -y keepalived

2） 
vim /etc/keepalived/keepalived.conf
! Configuration File for keepalived
global_defs {
   router_id 1
}
vrrp_instance VI_1 {
    state MASTER 
    interface ens33 #注意网卡
    virtual_router_id 51 
    priority 100 #MASTER要比BACKUP值要大
    advert_int 1
    authentication { 
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.171.199/24 dev ens33
    }
}
 
virtual_server 192.168.171.199 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    protocol TCP
    real_server 192.168.171.184 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3 
        }
    }
 
    real_server 192.168.171.189 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
        }
    }
}
3）
systemctl restart keepalived.service

4）
vim /etc/hosts
192.168.171.190 lvs1
192.168.171.191 lvs2

5） 
scp /etc/hosts 192.168.171.190:/etc/hosts

6） 
scp /etc/keepalived/keepalived.conf  192.168.171.190:/etc/keepalived/keepalived.conf
修改192.168.171.190上的配置文件etc/keepalived/keepalived.conf
priority 99
state BACKUP
​
systemctl restart keepalived.service

LVS2

1）
yum install -y keepalived
2）
LVS2与lvs1部署类似，只修改了几个参数
1>访问192.168.171.199会发现，看到了web1(188)页面的内容


2>此时我们断开web1这台服务器

3>继续访问199会发现，我们看到了web2(187)的页面

4>断开LVS1(191)服务器我们发现，LVS2(190)这台服务器继承了lvs1的虚拟的ip(199)访问199页面还可以正常访问，从而实现了保证业务不间断服务，把故障对业务影响降为最小

 后续我们还可对部署进行各种优化比如：

1.停掉HAproxy服务，在haproxy上安装nginx搭建动静分离部署

2.安装zabbix对代理服务器实时监控tcp连接数量

3.安装ELK对日志分析，新增一台centos7安装kibana将日志输出在页面进行观察

4.逐步优化网页建造LNMP动态网页

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