Keepalived+HAProxy基于读写分离方式实现discuz论坛

hb_sz

　　

　　

　　一、测试环境： centos 6.6；使用8台虚拟机（上图）
　　分别对它们设置主机名：

主机名	ip地址	软件包
node1	172.16.16.11	keepalived+haproxy
node2	172.16.16.12	keepalived+haproxy
php1	172.16.16.2	httpd+php+php-mysql+nfs-utils
php2	172.16.16.8	httpd+php+php-mysql+nfs-utils
web1	172.16.16.3	httpd
web2	172.16.16.4	httpd
mysql	172.16.16.5	mariadb-5.5.43-linux-x86_64.tar.gz
nfs	172.16.16.252	nfs-utils

　　上述服务器实现的作用介绍：
　　①keepalived+haproxy，实现高可用和haproxy的反向代理功能并实现动静分离的效果；请求动态的内容交给后端的动态服务器组（php1或php2）；静态内容交给静态服务器组（web1和web2）
　　②mysql服务器存储discuz数据库
　　③nfs文件共享服务器设置2个目录/mydata和/discuz；前者给mysql服务器用做当datadir使用；后者给web和php服务器使用，共享discuz网页文件
　　

　　

二、准备工作：这里基于ansible的playbook部署
1、ansible使用环境为centos 7；设置如下
# ssh-keygen -t rsa -P ''
# ssh-copy-id -i ~/.ssh/id_rsa.pub node1
# ssh-copy-id -i ~/.ssh/id_rsa.pub node2
# ssh-copy-id -i ~/.ssh/id_rsa.pub web1
# ssh-copy-id -i ~/.ssh/id_rsa.pub web2
# ssh-copy-id -i ~/.ssh/id_rsa.pub php1
# ssh-copy-id -i ~/.ssh/id_rsa.pub php2
# ssh-copy-id -i ~/.ssh/id_rsa.pub mysql
# ssh-copy-id -i ~/.ssh/id_rsa.pub nfs

2、ansible设置及管理节点探测：
# vim /etc/ansible/host
[haproxy]
172.16.16.11
172.16.16.12
[dynamic_servers]
172.16.16.2
172.16.16.8
[static_servers]
172.16.16.3
172.16.16.4
[db]
172.16.16.5
[nfs]
172.16.16.252

# ansible all -m ping        
172.16.16.12 | success >> {
    "changed": false,
    "ping": "pong"
}
172.16.16.3 | success >> {
    "changed": false,
    "ping": "pong"
}
172.16.16.11 | success >> {
    "changed": false,
    "ping": "pong"
}
172.16.16.4 | success >> {
    "changed": false,
    "ping": "pong"
}
172.16.16.5 | success >> {
    "changed": false,
    "ping": "pong"
}
172.16.16.2 | success >> {
    "changed": false,
    "ping": "pong"
}
172.16.16.8 | success >> {
    "changed": false,
    "ping": "pong"
}
172.16.16.252 | success >> {
    "changed": false,
    "ping": "pong"
}　　

　　3、ansible定义roles如下：
[root@localhost ansible_playbooks]# tree
.
|-- haproxy.yml                 //playbook剧本
`-- roles                       //定义的角色（7个）         
    |-- haproxy                 //node1,node2节点用到的haproxy
    |   |-- files
    |   |-- handlers
    |   |   `-- main.yml
    |   |-- tasks
    |   |   `-- main.yml
    |   |-- templates
    |   |   |-- haproxy.cfg.j2
    |   |   `-- rsyslog.conf
    |   `-- vars
    |       `-- main.yml
    |-- httpd                 //web1，web2节点用到的httpd
    |   |-- files
    |   |   `-- mountnfs.sh
    |   |-- handlers
    |   |-- tasks
    |   |   `-- main.yml
    |   `-- templates
    |       `-- httpd.conf.j2
    |-- initialization               //所有节点用到的系统初始化
    |   |-- files
    |   |-- handlers
    |   |-- tasks
    |   |   `-- main.yml
    |   `-- templates
    |       |-- hosts
    |       |-- resolv.conf
    |       `-- selinux.conf
    |-- keepalived                 //keepalived设置
    |   |-- files
    |   |   `-- notify.sh
    |   |-- handlers
    |   |   `-- main.yml
    |   |-- tasks
    |   |   `-- main.yml
    |   |-- templates
    |   |   |-- keepalived.conf.backup.j2
    |   |   `-- keepalived.conf.master.j2
    |   `-- vars
    |       `-- main.yml
    |-- mysql                      //mysql数据库
    |   |-- files
    |   |   |-- mariadb-5.5.43-linux-x86_64.tar.gz
    |   |   |-- mariadb-5.5.43.sh
    |   |   `-- privilege.sh
    |   |-- handlers
    |   |-- tasks
    |   |   `-- main.yml
    |   `-- templates
    |-- nfs                            //nfs文件共享
    |   |-- files
    |   |   |-- Discuz_X3.1_SC_UTF8.zip
    |   |   `-- discuz.sh
    |   |-- handlers
    |   |-- tasks
    |   |   `-- main.yml
    |   `-- templates
    |       `-- exports
    `-- php                    //php1,php2节点用到的相关配置
        |-- files
        |   |-- install-php.sh
        |   `-- mountnfs.sh
        |-- handlers
        |-- tasks
        |   `-- main.yml
        `-- templates
            `-- httpd.conf.j2　　

　　4、介绍上述roles代表的含义，从上至下进行介绍；
　　
　　
　　4.1、haproxy

handlers:main.yml	- name: restart haproxy       //重启haproxy服务 　　service: name=haproxy state=restarted 　　- name: restart rsyslog      //重启rsyslog服务 　　service: name=rsyslog state=restarted
tasks:main.yml	- name: install haproxy package　　yum: name=haproxy state=present 　　- name: configuration haproxy 　　template: src=haproxy.cfg.j2   dest=/etc/haproxy/haproxy.cfg 　　notify: 　　- restart haproxy 　　tags: cfg 　　- name: configuration rsyslog for haproxy 　　template: src=rsyslog.conf   dest=/etc/rsyslog.conf 　　notify: 　　- restart rsyslog 　　- name: start haproxy service 　　service: name=haproxy state=started enabled=yes
template	haproxy.cfg.j2:  //只截取了重要的部分，动静分离，后端服务器定义 　　frontend  http 　　bind *:80 　　mode http 　　log global 　　option httpclose 　　option logasap 　　option dontlognull 　　acl url_static       path_end       -i .jpg .gif .png .css .js .html .ico 　　use_backend static_servers          if url_static 　　default_backend dynamic_servers 　　 　　#--------------------------------------------------------------------- 　　# static backend for serving up images, stylesheets and such 　　#--------------------------------------------------------------------- 　　backend static_servers 　　balance    roundrobin 　　cookie   WebID  insert nocache 　　server   web1 ` web1_ip `:80 check cookie web1 　　server   web2 ` web2_ip `:80 check cookie web2 　　 　　#--------------------------------------------------------------------- 　　# round robin balancing between the various backends 　　#--------------------------------------------------------------------- 　　backend dynamic_servers 　　balance     uri 　　hash-type consistent 　　server  php1 ` php1_ip `:80 check cookie php1 　　server  php2 ` php2_ip `:80 check cookie php2 　　 　　rsyslog.conf
vars:main.yml	web1_ip : 172.16.16.3           //静态web1服务器ip 　　web2_ip : 172.16.16.4          //静态web2服务器ip 　　php1_ip : 172.16.16.2         //动态php1服务器ip 　　php2_ip : 172.16.16.8        //动态php2服务器ip

　　

　　4.2、httpd

files：mountnfs.sh	yum install -y nfs-utils &> /dev/null   //挂载nfs共享目录 　　echo " 172.16.16.252:/discuz     /var/www/html/          nfs    defaults,_netdev       0 0 " >> /etc/fstab 　　mount -a
tasks:main.yml	- name: install httpd package 　　yum: name=httpd state=present 　　- name: mount nfs share directory /discuz 　　script: mountnfs.sh 　　- name: set configuration 　　template: src=httpd.conf.j2 dest=/etc/httpd/conf/httpd.conf 　　- name: start httpd service 　　service: name=httpd state=started
templates:http.conf.j2	LogFormat %{X-Forwarded-For}i combined  //将客户端ip记入日志

　　

　　4.3、initialization

tasks：main.yml

- name: set selinux 　　shell: sed -i 's@^SELINUX=.*@SELINUX=permissive@' /etc/selinux/config 　　shell: setenforce 0 　　- name: install libselinux-python package 　　yum: name=libselinux-python state=present 　　- name: copy hosts to all node /etc/hosts 　　template: src=hosts dest=/etc/hosts 　　- name: copy resolv.conf to all node /etc/resolv.conf 　　template: src=resolv.conf dest=/etc/resolv.conf 　　- name: install ntpdate package 　　yum: name=ntpdate state=present 　　- name: synctime from ntp.sjtu.edu.cn 　　shell: ntpdate ntp.sjtu.edu.cn 　　- name: set a cron to synctime from ntp.sjtu.edu.cn 　　cron: name="cron to synctime from ntp.sjtu.edu.cn" minute="*/5" job="/usr/sbin/ntpdate ntp.sjtu.edu.cn &> /dev/null" state=present 　　- name: modify selinux configuration 　　template: src=selinux.conf dest=/etc/selinux/conf 　　- name: set selinux permissive 　　shell: setenforce 0

templates:3个文件

(1)hosts 　　127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4 　　::1         localhost localhost.localdomain localhost6 localhost6.localdomain6 　　172.16.16.11    node1 　　172.16.16.12    node2 　　172.16.16.3     web1 　　172.16.16.4     web2 　　172.16.16.2     php1 　　172.16.16.8     php2 　　172.16.16.5     mysql 　　172.16.16.252  nfs 　　 　　(2)resolv.conf 　　nameserver 172.16.0.1 　　 　　(3)selinux.conf 　　SELINUX=disabled 　　SELINUXTYPE=targeted

　　

　　4.4、keepalived

files:notify.sh	通知机制：当主从发生变化的时候给管理员发邮件
handlers：main.yml	- name: restart keepalived　　service: name=keepalived state=restarted
tasks:main.yml	- name: install keepalived package　　yum: name=keepalived state=present 　　- name: copy notify.sh to node1 and node2 　　copy: src=notify.sh dest=/etc/keepalived/notify.sh 　　- name: configure keepalived on node1-master 　　template: src=keepalived.conf.master.j2 dest=/etc/keepalived/keepalived.conf 　　when: ansible_hostname == "node1" 　　notify: 　　- restart keepalived 　　- name: configure keepalived on node2-backup 　　template: src=keepalived.conf.backup.j2 dest=/etc/keepalived/keepalived.conf 　　when: ansible_hostname == "node2" 　　notify: 　　- restart keepalived 　　- name: start keepalived service 　　service: name=keepalived state=started enabled=yes
templates	keepalived.conf.master.j2 　　! Configuration File for keepalived 　　 　　global_defs { 　　notification_email { 　　root@localhost 　　} 　　notification_email_from keepalived@localhost 　　smtp_connect_timeout 3 　　smtp_server 127.0.0.1 　　router_id LVS_DEVEL 　　} 　　 　　vrrp_script chk_haproxy { 　　script "killall -0 haproxy" 　　interval 1 　　weight 2 　　} 　　 　　vrrp_script chk_mantaince_down { 　　script "[[ -f /etc/keepalived/down ]] && exit 1 || exit 0" 　　interval 1 　　weight 2 　　} 　　 　　vrrp_instance VI_1 { 　　interface eth0 　　state MASTER  # BACKUP for slave routers 　　priority 101  # 100 for BACKUP 　　virtual_router_id 51 　　garp_master_delay 1 　　 　　authentication { 　　auth_type PASS 　　auth_pass password12345 　　} 　　track_interface { 　　eth0 　　} 　　virtual_ipaddress { 　　` vip `/16 dev eth0 label eth0:0 　　} 　　track_script { 　　chk_haproxy 　　chk_mantaince_down 　　} 　　 　　notify_master "/etc/keepalived/notify.sh master" 　　notify_backup "/etc/keepalived/notify.sh backup" 　　notify_fault "/etc/keepalived/notify.sh fault" 　　} 　　 　　 　　keepalived.conf.backup.j2 state BACKUP priority 100
vars:main.yml	vip : 172.16.16.50

　　

　　4.5、mysql

files:3个文件	(1)mariadb-5.5.43.sh: 编译安装配置mariadb的脚本，就不发了，太多 　　 　　(2)privilege.sh 　　#!/bin/bash 　　#! privilege to dzuser 　　 　　echo "create database discuz; 　　grant all on discuz.* to 'dzuser'@'172.16.%.%' identified by 'dzpasswd'; 　　flush privileges; 　　\q" | mysql 　　~
tasks:main.yml	- name: copy mariadb-5.5.43 package 　　copy: src=mariadb-5.5.43-linux-x86_64.tar.gz dest=/root/mariadb-5.5.43-linux-x86_64.tar.gz 　　- name: install mysql and cofiguration 　　script: mariadb-5.5.43.sh 　　- name: start mysqld service 　　shell: service mysqld start 　　- name: privileges to dzuser 　　script: privilege.sh 　　tags: haha

　　

　　4.6、nfs

files：discuz.sh	#!/bin/bash 　　# discuz configuration 　　 　　unzip -d /discuz /root/Discuz_X3.1_SC_UTF8.zip 　　chmod -R go+w /discuz/upload/config/ 　　chmod -R go+w /discuz/upload/data/ 　　chmod -R go+w /discuz/upload/uc_*
tasks:main.yml	- name: mkdir share directory to mysql and web 　　shell: mkdir -pv /{mydata,discuz} 　　- name: install nfs package 　　yum: name=nfs-utils state=present 　　- name: useradd mysql 　　user: name=mysql state=present system=yes 　　- name: useradd apache 　　user: name=apache state=present system=yes 　　- name: copy exports to nfs node 　　template: src=exports dest=/etc/exports 　　- name: set mysql mode(rwx) to /mydata 　　shell: setfacl -m u:mysql:rwx /mydata 　　- name: set apache mode(rwx) to /discuz 　　shell: setfacl -m u:apache:rwx /discuz 　　- name: copy Discuz_X3.1_SC_UTF8.zip package 　　copy: src=Discuz_X3.1_SC_UTF8.zip dest=/root/Discuz_X3.1_SC_UTF8.zip 　　- name: install unzip package 　　yum: name=unzip state=present 　　- name: configuration discuz 　　script: discuz.sh 　　- name: start rpcbind service 　　service: name=rpcbind state=started 　　- name: start nfs service
templates:exports	/mydata    172.16.0.0/16(rw,no_root_squash)//编译安装mysql需要这样设置，安装完可以改成rw权限即可　　/discuz    172.16.0.0/16(rw)

　　

　　4.7、php

files：2个文件	(1)install-php.sh 　　#!/bin/bash 　　# install nfs-utils httpd | php | php-mysql 　　yum install -y nfs-utils httpd php php-mysql openssl-devel &> /dev/null 　　 　　(2)mountnfs.sh //同httpd使用的脚本
tasks：main.yml	- name: install nfs-utils | httpd | php | php-mysql package　　script: install-php.sh 　　- name: mount nfs share directory /discuz 　　script: mountnfs.sh 　　- name: set configuration 　　template: src=httpd.conf.j2 dest=/etc/httpd/conf/httpd.conf 　　- name: start httpd service 　　service: name=httpd state=started
templates:httpd.conf.j2	这个模板也同httpd使用的！

　　

　　三、执行过程如下
[root@localhost ansible_playbooks]# ansible-playbook haproxy.yml //执行ansible剧本
PLAY [nfs] ********************************************************************
GATHERING FACTS ***************************************************************
ok: [172.16.16.252]               
TASK: [initialization | set selinux] ******************************************
changed: [172.16.16.252]                       //设置selinux
TASK: [initialization | install libselinux-python package] ********************
changed: [172.16.16.252]                       //需要安装libselinux-python
TASK: [initialization | copy hosts to all node /etc/hosts] ********************
changed: [172.16.16.252]                      //复制主机名解析文件
TASK: [initialization | copy resolv.conf to all node /etc/resolv.conf] ********
changed: [172.16.16.252]                    //复制域名文件
TASK: [initialization | install ntpdate package] ******************************
changed: [172.16.16.252]                     //安装ntpdate
TASK: [initialization | synctime from ntp.sjtu.edu.cn] ************************
changed: [172.16.16.252]
                                                 //同步时间
TASK: [initialization | set a cron to synctime from ntp.sjtu.edu.cn] **********                                              //设置计划任务
changed: [172.16.16.252]
TASK: [initialization | modify selinux configuration] *************************
changed: [172.16.16.252]                        //修改selinux
TASK: [initialization | set selinux permissive] *******************************
changed: [172.16.16.252]
TASK: [nfs | mkdir share directory to mysql and web] **************************
changed: [172.16.16.252]              //创建nfs的共享目录/mydata和/discuz
TASK: [nfs | install nfs package] *********************************************
changed: [172.16.16.252]                //安装nfs-utils
TASK: [nfs | useradd mysql] ***************************************************
changed: [172.16.16.252]                 //添加mysql用户
TASK: [nfs | useradd apache] **************************************************
changed: [172.16.16.252]                //添加apache用户
TASK: [nfs | copy exports to nfs node] ****************************************
changed: [172.16.16.252]                //设置nfs导出的共享目录
TASK: [nfs | set mysql mode(rwx) to /mydata] **********************************
changed: [172.16.16.252]                //给mysql对/mydata的rwx权限
TASK: [nfs | set apache mode(rwx) to /discuz] *********************************
changed: [172.16.16.252]                //给apache对/discuz的rwx权限
TASK: [nfs | copy Discuz_X3.1_SC_UTF8.zip package] ****************************
changed: [172.16.16.252]               //复制discuz安装包到nfs服务器
TASK: [nfs | install unzip package] *******************************************
changed: [172.16.16.252]                //解压discuz
TASK: [nfs | configuration discuz] ********************************************
changed: [172.16.16.252]                 //配置discuz网页文件（给其对应访问权限）
TASK: [nfs | start rpcbind service] *******************************************
changed: [172.16.16.252]                 //启动rpcbind服务
TASK: [nfs | start nfs service] ***********************************************
changed: [172.16.16.252]               //启动nfs服务
PLAY [db] *********************************************************************
                                         //安装及配置mysql
GATHERING FACTS ***************************************************************
ok: [172.16.16.5]                 
TASK: [initialization | set selinux] ******************************************
changed: [172.16.16.5]
TASK: [initialization | install libselinux-python package] ********************
changed: [172.16.16.5]
TASK: [initialization | copy hosts to all node /etc/hosts] ********************
changed: [172.16.16.5]
TASK: [initialization | copy resolv.conf to all node /etc/resolv.conf] ********
changed: [172.16.16.5]
TASK: [initialization | install ntpdate package] ******************************
changed: [172.16.16.5]
TASK: [initialization | synctime from ntp.sjtu.edu.cn] ************************
changed: [172.16.16.5]
TASK: [initialization | set a cron to synctime from ntp.sjtu.edu.cn] **********
changed: [172.16.16.5]
TASK: [initialization | modify selinux configuration] *************************
changed: [172.16.16.5]
TASK: [initialization | set selinux permissive] *******************************
changed: [172.16.16.5]
TASK: [mysql | copy mariadb-5.5.43 package] ***********************************
changed: [172.16.16.5]                //复制mariadb到mysql服务器
TASK: [mysql | install mysql and cofiguration] ********************************
changed: [172.16.16.5]                 //脚本执行mysql安装，配置
TASK: [mysql | start mysqld service] ******************************************
changed: [172.16.16.5]              //启动mysqld服务
TASK: [mysql | privileges to dzuser] ******************************************
changed: [172.16.16.5]              //使用脚本创建discuz数据库，并给dzuser授权
PLAY [static_servers] *********************************************************
                                   //静态服务器设置 web1和web2节点
GATHERING FACTS ***************************************************************
ok: [172.16.16.3]
ok: [172.16.16.4]
TASK: [initialization | set selinux] ******************************************
changed: [172.16.16.3]
changed: [172.16.16.4]
TASK: [initialization | install libselinux-python package] ********************
changed: [172.16.16.3]
changed: [172.16.16.4]
TASK: [initialization | copy hosts to all node /etc/hosts] ********************
changed: [172.16.16.4]
changed: [172.16.16.3]
TASK: [initialization | copy resolv.conf to all node /etc/resolv.conf] ********
changed: [172.16.16.3]
changed: [172.16.16.4]
TASK: [initialization | install ntpdate package] ******************************
changed: [172.16.16.3]
changed: [172.16.16.4]
TASK: [initialization | synctime from ntp.sjtu.edu.cn] ************************
changed: [172.16.16.4]
changed: [172.16.16.3]
TASK: [initialization | set a cron to synctime from ntp.sjtu.edu.cn] **********
changed: [172.16.16.3]
changed: [172.16.16.4]
TASK: [initialization | modify selinux configuration] *************************
changed: [172.16.16.3]
changed: [172.16.16.4]
TASK: [initialization | set selinux permissive] *******************************
changed: [172.16.16.4]
changed: [172.16.16.3]
TASK: [httpd | install httpd package] *****************************************
changed: [172.16.16.3]                //安装httpd软件包
changed: [172.16.16.4]         
TASK: [httpd | mount nfs share directory /discuz] *****************************
changed: [172.16.16.3]                 //挂载nfs服务器共享的discuz目录至/var/www/html
changed: [172.16.16.4]
TASK: [httpd | set configuration] *********************************************
changed: [172.16.16.4]              //配置httpd.conf
changed: [172.16.16.3]
TASK: [httpd | start httpd service] *******************************************
changed: [172.16.16.3]                 //启动httpd服务
changed: [172.16.16.4]
PLAY [dynamic_servers] ********************************************************
                                    //设置动态服务器php1和php2节点
GATHERING FACTS ***************************************************************
ok: [172.16.16.2]
ok: [172.16.16.8]
TASK: [initialization | set selinux] ******************************************
changed: [172.16.16.2]
changed: [172.16.16.8]
TASK: [initialization | install libselinux-python package] ********************
changed: [172.16.16.2]
changed: [172.16.16.8]
TASK: [initialization | copy hosts to all node /etc/hosts] ********************
changed: [172.16.16.8]
changed: [172.16.16.2]
TASK: [initialization | copy resolv.conf to all node /etc/resolv.conf] ********
changed: [172.16.16.8]
changed: [172.16.16.2]
TASK: [initialization | install ntpdate package] ******************************
changed: [172.16.16.2]
changed: [172.16.16.8]
TASK: [initialization | synctime from ntp.sjtu.edu.cn] ************************
changed: [172.16.16.2]
changed: [172.16.16.8]
TASK: [initialization | set a cron to synctime from ntp.sjtu.edu.cn] **********
changed: [172.16.16.8]
changed: [172.16.16.2]
TASK: [initialization | modify selinux configuration] *************************
changed: [172.16.16.8]
changed: [172.16.16.2]
TASK: [initialization | set selinux permissive] *******************************
changed: [172.16.16.8]
changed: [172.16.16.2]
TASK: [php | install nfs-utils | httpd | php | php-mysql package] *************
changed: [172.16.16.8]              //安装php软件包（使用的是centos 6系统自带的）
changed: [172.16.16.2]
TASK: [php | mount nfs share directory /discuz] *******************************
changed: [172.16.16.8]             //挂载discuz目录至/var/www/html
changed: [172.16.16.2]
TASK: [php | set configuration] ***********************************************
changed: [172.16.16.8]              //配置httpd.conf，给日志加入客户端访问的ip地址
changed: [172.16.16.2]         
TASK: [php | start httpd service] *********************************************
changed: [172.16.16.8]             //启用php功能
changed: [172.16.16.2]
PLAY [haproxy] ****************************************************************
                                   //安装设置keepalived+haproxy（node1和node2）
GATHERING FACTS ***************************************************************
ok: [172.16.16.12]
ok: [172.16.16.11]
TASK: [initialization | set selinux] ******************************************
changed: [172.16.16.12]
changed: [172.16.16.11]
TASK: [initialization | install libselinux-python package] ********************
changed: [172.16.16.12]
changed: [172.16.16.11]
TASK: [initialization | copy hosts to all node /etc/hosts] ********************
changed: [172.16.16.12]
changed: [172.16.16.11]
TASK: [initialization | copy resolv.conf to all node /etc/resolv.conf] ********
changed: [172.16.16.11]
changed: [172.16.16.12]
TASK: [initialization | install ntpdate package] ******************************
ok: [172.16.16.12]
ok: [172.16.16.11]
TASK: [initialization | synctime from ntp.sjtu.edu.cn] ************************
changed: [172.16.16.12]
changed: [172.16.16.11]
TASK: [initialization | set a cron to synctime from ntp.sjtu.edu.cn] **********
changed: [172.16.16.11]
changed: [172.16.16.12]
TASK: [initialization | modify selinux configuration] *************************
changed: [172.16.16.11]
changed: [172.16.16.12]
TASK: [initialization | set selinux permissive] *******************************
changed: [172.16.16.11]
changed: [172.16.16.12]
TASK: [keepalived | install keepalived package] *******************************
changed: [172.16.16.11]            //安装keepalived
changed: [172.16.16.12]                 
TASK: [keepalived | copy notify.sh to node1 and node2] ************************                                
changed: [172.16.16.12]               //复制通知脚本给node1和node2
changed: [172.16.16.11]
TASK: [keepalived | configure keepalived on node1-master] *********************
skipping: [172.16.16.12]             //设置node1为MASTER节点
changed: [172.16.16.11]
TASK: [keepalived | configure keepalived on node2-backup] *********************
skipping: [172.16.16.11]           //设置node2为BACKUP节点
changed: [172.16.16.12]      
TASK: [keepalived | start keepalived service] *********************************
changed: [172.16.16.12]            //启动keepalived服务   
changed: [172.16.16.11]
TASK: [haproxy | install haproxy package] *************************************
changed: [172.16.16.12]               //安装haproxy软件包
changed: [172.16.16.11]
TASK: [haproxy | configuration haproxy] ***************************************
changed: [172.16.16.12]             //配置haproxy，实现动静分离
changed: [172.16.16.11]
TASK: [haproxy | configuration rsyslog for haproxy] ***************************
changed: [172.16.16.11]          //记录haproxy的日志
changed: [172.16.16.12]
TASK: [haproxy | start haproxy service] ***************************************
changed: [172.16.16.12]          //启动haproxy服务
changed: [172.16.16.11]
NOTIFIED: [keepalived | restart keepalived] ***********************************
changed: [172.16.16.12]          //配置文件发生变化，重启keepalived服务
changed: [172.16.16.11]
NOTIFIED: [haproxy | restart haproxy] *****************************************
changed: [172.16.16.11]           //配置文件发生变化，重启haproxy服务
changed: [172.16.16.12]        
NOTIFIED: [haproxy | restart rsyslog] *****************************************
changed: [172.16.16.12]       //配置文件发生变化，重启rsyslog服务
changed: [172.16.16.11]
PLAY RECAP ********************************************************************
172.16.16.11               : ok=21   changed=19   unreachable=0    failed=0   
172.16.16.12               : ok=21   changed=19   unreachable=0    failed=0   
172.16.16.2                : ok=14   changed=13   unreachable=0    failed=0   
172.16.16.252              : ok=22   changed=21   unreachable=0    failed=0   
172.16.16.3                : ok=14   changed=13   unreachable=0    failed=0   
172.16.16.4                : ok=14   changed=13   unreachable=0    failed=0   
172.16.16.5                : ok=14   changed=13   unreachable=0    failed=0   
172.16.16.8                : ok=14   changed=13   unreachable=0    failed=0　　

　　四、安装discuz论坛

　　

　　安装完成，使用vip：172.16.16.50测试正常！！如下图：

　　

　　

　　五、额外测试过程：
　　（1）测试keepalived是否工作正常，在master出现问题的时候，是否可以切换到backup上：

[root@node1 keepalived]# touch down//通过keepalived配置文件定义脚本测试vip是否转移到node2
[root@node1 keepalived]# tail /var/log/messages    //通过下面的日志可看出node1成为BACKUP
Oct 24 20:08:19 node1 Keepalived_vrrp[2644]: VRRP_Script(chk_mantaince_down) failed
Oct 24 20:08:21 node1 Keepalived_vrrp[2644]: VRRP_Instance(VI_1) Received higher prio advert
Oct 24 20:08:21 node1 Keepalived_vrrp[2644]: VRRP_Instance(VI_1) Entering BACKUP STATE
Oct 24 20:08:21 node1 Keepalived_vrrp[2644]: VRRP_Instance(VI_1) removing protocol VIPs.
Oct 24 20:08:21 node1 Keepalived_healthcheckers[2643]: Netlink reflector reports IP 172.16.16.50 removed

[root@node2 ~]# tail /var/log/messages         //通过下面的日志可看出node2成为MASTER
Oct 24 20:08:22 node2 Keepalived_vrrp[2442]: VRRP_Instance(VI_1) Transition to MASTER STATE
Oct 24 20:08:23 node2 Keepalived_vrrp[2442]: VRRP_Instance(VI_1) Entering MASTER STATE
Oct 24 20:08:23 node2 Keepalived_vrrp[2442]: VRRP_Instance(VI_1) setting protocol VIPs.
Oct 24 20:08:23 node2 Keepalived_healthcheckers[2441]: Netlink reflector reports IP 172.16.16.50 added
Oct 24 20:08:23 node2 Keepalived_vrrp[2442]: VRRP_Instance(VI_1) Sending gratuitous ARPs on eth0 for 172.16.16.50　　
[root@node1 keepalived]# tail /var/log/haproxy.log
Oct 24 20:08:21 node1 Keepalived_healthcheckers[2643]: Netlink reflector reports IP 172.16.16.50 removed
[root@node2 ~]# tail /var/log/haproxy.log
Oct 24 20:08:23 node2 Keepalived_healthcheckers[2441]: Netlink reflector reports IP 172.16.16.50 added　　

　　这个时候访问discuz论坛仍然没有问题；说明keepalived发挥了作用！

　　

　　

　　（2）测试haproxy是否可以实现读写分离？方法：将所有static_servers的httpd服务停止，测试只提供php的功能，显示效果如下图
[root@web1 ~]# service httpd stop     //停止web1和web2的httpd服务，提供静态内容显示
[root@web2 ~]# service httpd stop　　
　　

　　# 可以看到上面的效果，图片都已经不再显示，将web2加回来，然后再查看效果，没查看http的访问日志
[root@web2 ~]# service httpd start       //启动其中的一台
[root@web2 ~]# tail /var/log/httpd/access_log
172.16.0.3 - - [24/Oct/2015:20:46:54 +0800] "GET /static/image/common/user_online.gif HTTP/1.1" 200 868 "http://172.16.16.50/data/cache/style_1_common.css?SFA" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36"
172.16.0.3 - - [24/Oct/2015:20:46:54 +0800] "GET /static/image/common/arrwd.gif HTTP/1.1" 200 51 "http://172.16.16.50/data/cache/style_1_common.css?SFA" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36"
172.16.0.3 - - [24/Oct/2015:20:46:54 +0800] "GET /static/image/common/qmenu.png HTTP/1.1" 200 225 "http://172.16.16.50/data/cache/style_1_common.css?SFA" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36"
172.16.0.3 - - [24/Oct/2015:20:46:54 +0800] "GET /static/image/common/nv.png HTTP/1.1" 200 1939 "http://172.16.16.50/data/cache/style_1_common.css?SFA" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36"
172.16.0.3 - - [24/Oct/2015:20:46:54 +0800] "GET /static/image/common/nv_a.png HTTP/1.1" 200 2076 "http://172.16.16.50/data/cache/style_1_common.css?SFA" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36"
172.16.0.3 - - [24/Oct/2015:20:46:54 +0800] "GET /static/image/common/search.png HTTP/1.1" 200 1301 "http://172.16.16.50/data/cache/style_1_common.css?SFA" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36"
172.16.0.3 - - [24/Oct/2015:20:46:54 +0800] "GET /static/image/common/chart.png HTTP/1.1" 200 990 "http://172.16.16.50/data/cache/style_1_forum_index.css?SFA" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36"
172.16.0.3 - - [24/Oct/2015:20:46:54 +0800] "GET /static/image/common/pt_item.png HTTP/1.1" 200 3598 "http://172.16.16.50/data/cache/style_1_common.css?SFA" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36"
172.16.0.3 - - [24/Oct/2015:20:46:54 +0800] "GET /static/image/common/titlebg.png HTTP/1.1" 200 315 "http://172.16.16.50/data/cache/style_1_common.css?SFA" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36"
172.16.0.3 - - [24/Oct/2015:20:46:55 +0800] "GET /static/image/common/scrolltop.png HTTP/1.1" 200 1383 "http://172.16.16.50/data/cache/style_1_common.css?SFA" "Mozilla/5.0 (Windows NT 6.2; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/44.0.2403.155 Safari/537.36"　　

　　至此，终于将所有剧本，脚本，图片，日志整理完成！