基于lvs-dr模型的discuz负载均衡实现

21232asa

前言：
lvs-dr模型与之前的lvs-nat模型情况基本差不多，只是网络拓扑结构不同。

HostVS

OS：CentOS-7-x86_64
hostname:ws1
eno16777736: 10.0.0.60/8(DIP)
eno167777336:0: 10.0.0.61/32(VIP)
gateway:10.0.0.254

HostRS1
OS：CentOS-7-x86_64

hostname:ws2

eno16777736：10.0.0.101/8 (RIP1)

lo:0 10.0.0.61/32 (VIP)

gateway:10.0.0.254

HostRS2

OS：CentOS-7-x86_64

hostname:ws3

eno16777736：10.0.0.102/8(RIP2)

lo:0 10.0.0.61/32(VIP)

gateway:10.0.0.254

HostDB

OS：CentOS-7-x86_64

hostname:ws4

eno16777736: 10.0.0.202/8

gateway:10.0.0.254

时间同步：

1 2	# ntpdate cn.pool.ntp.org # hwclock --sysohc

安装软件：
HostDB

安装二进制mariadb-5.5.46

安装NFS

1	# yum install -y nfs-utils

HostRS2

安装nginx，注意nginx属于epel源

1	# yum install-y nginx php-fpm php-mbstring php-mysql nfs-utils mariadb

HostRS1

安装nginx，注意nginx属于epel源

1	# yum install-y nginx php-fpm php-mbstring php-mysql nfs-utils mariadb

HostVS

安装LVS的cli接口程序ipvsadm

1	# yum install -y ipvsadm

配置集群

HostDB

配置mariadb

安全初始化完成后，创建discuz数据库和discuz用户，并授权其可远程操作数据库

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# mysql_secure_installation # mysql -u root -p > create database discuz; > create user 'discuz'@'lodalhost' identified by '123456'; > grant all privileges on discuz.* to 'discuz'@'%' identified by '123456'; > flush privileges;

配置NFS

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# mkdir /nfshare/ # ls -ld /nfshare/ drwxr-xr-x 2 root root 6 May 9 17:01 /nfshare/ # echo "/nfshare/ 10.0.0.101(rw,no_root_squash,async) 10.0.0.102(rw,no_root_squash,async)" > /etc/exports # /etc/init.d/rpcbind start Starting rpcbind:                        [  OK  ] # /etc/init.d/nfs start Starting NFS services:                      [  OK  ] Starting NFS quotas:                      [  OK  ] Starting NFS mountd:                        [  OK  ] Starting NFS daemon:                       [  OK  ] Starting RPC idmapd:                      [  OK  ] # chkconfig rpcbind on # chkconfig nfs on # chkconfig rpcbind --list rpcbind            0:off    1:off    2:on    3:on    4:on    5:on    6:off # chkconfig nfs --list nfs                0:off    1:off    2:on    3:on    4:on    5:on    6:off # showmount -e 127.0.0.1 Export list for 127.0.0.1: /nfshare/ 10.0.0.101,10.0.0.102 exportfs -avr  检查设置是否正确

注意：rpcbind和nfs两个服务启动顺序不能更换，否则会出问题

解压discuz的程序包至/nfsshare/目录

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# mkdir /nfshare/discuz # unzip /Discuz_X3.2_SC_UTF8.zip -d /nfshare/discuz/ # ls /nfshare/discuz/ readme  upload  utility

HostRS1


给RS配置VIP之前先要禁止RS响应VIP的ARP请求

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echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce

在本地回环接口别名lo:0上配置VIP，并增添路由

1 2	ifconfig lo:0 10.0.0.61 broadcast 10.0.0.61 netmask 255.255.255.255 route add -host 10.0.0.61 dev lo:0

测试链接HostDB上的mariadb

1	# mysql -h 10.0.0.202 -u discuz -p

挂载HostDB上的NFS共享存储目录，属主属组修改为apache

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# showmount -e 172.18.64.202 Export list for 172.18.64.202: /nfshare/ 10.0.0.101,10.0.0.102 # mkdir /htdocs # ls -ld /htdocs/ drwxr-xr-x 2 root root 6 May 9 17:05 /htdocs/ # mount -t nfs 172.18.64.202:/nfshare /htdocs # ls /htdocs/ discuz # chown -R apache:apache /htdocs/discuz/

启动php-fpm

1 2	# systemctl start php-fpm.service # ss -tnl | grep 9000

配置nginx的配置文件

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# vim /etc/nginx/nginx.conf server {         listen     80;         server_name  ws2         # Load configuration files for the default server block.         include /etc/nginx/default.d/*.conf;         location / {             root    /htdocs/discuz/upload;             index index.html index.htm index.php;         }         location ~ \.php$ {             root  /htdocs/discuz/upload;             fastcgi_pass 127.0.0.1:9000;             fastcgi_index index.php;             include /etc/nginx/fastcgi.conf;         }         error_page 404 /404.html;             location = /40x.html {         }         error_page 500 502 503 504 /50x.html;             location = /50x.html {         }     } # nginx -t nginx: the configuration file /etc/nginx/nginx.conf syntax is ok nginx: configuration file /etc/nginx/nginx.conf test is successful # nginx # ss -tnl | grep 80 LISTEN     0      128          *:80                       *:*

测试访问discuz安装页面主机加上最后的/

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# curl -I http://10.0.0.101/install/ HTTP/1.1 200 OK Server: nginx/1.6.3 Date: Mon, 09 May 2016 10:23:50 GMT Content-Type: text/html Connection: keep-alive X-Powered-By: PHP/5.4.16

HostRS2
配置同上

HostVS
配置VIP地址，并打开核心转发功能。

1 2	# ifconfig eno16777736:0 10.0.0.61 broadcast 10.0.0.61 netmask 255.255.255.255 up # echo 1 > /proc/sys/net/ipv4/ip_forward

先使用rr调度算法，期望会话丢失情况出现，若出现会话丢失情况，改用sh调度算法再做测试，期望会话能够保持。

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# ipvsadm -A -t 10.0.0.61:80 -s rr # ipvsadm -a -t 10.0.0.61:80 -r 10.0.0.101:80 -g # ipvsadm -a -t 10.0.0.61:80 -r 10.0.0.102:80 -g # ipvsadm -Ln

测试验证：