在lvs-dr集群上部署wordpress、phpMyadmin

2018-05-20  本文已影响0人  小尛酒窝

1、前言

在学习了Lvs集群的相关知识后,尝试在部署lvs集群并提供两个不同的虚拟服务分别对应访问wordpress和phpMyadmin应用。

2、部署准备

部署拓扑图

部署使用5个centos 7 的虚拟主机分别作为Router、Director、RS1、RS2及提供相关应用的server。 按照拓扑规划部署相关的应用服务,实现mnp应用服务器能够提供mysql、php-fpm、nfs等应用服务给RS1、RS2使用;RS1,RS2分别利用nginx部署wordpress和phpMyadmin;在Director上启用lvs虚拟服务,分别分别负载wordpress和phpmyadmin到两台RS上;Router模拟网关,提供SNAT服务,并将内网的lvs虚拟服务DNAT映射到外网。基础的网络搭建如拓扑所示,本文不再列出。
另在配置前需要注意各服务器的时间是否同步,如时区不一致,可能会导致应用服务运行异常:

#更改时区命令
[root@director ~]# tzselect
......
You can make this change permanent for yourself by appending the line
    TZ='Asia/Shanghai'; export TZ
to the file '.profile' in your home directory; then log out and log in again.

Here is that TZ value again, this time on standard output so that you
can use the /usr/bin/tzselect command in shell scripts:
Asia/Shanghai
#然后TZ='Asia/Shanghai'; export TZ添加到/etc/profile文件中,然后重新登录登出即可

#向网络ntp服务器同步时间
[root@director ~]# ntpdate ntp1.aliyun.com

3、配置router

配置提供内网的SNAT上网:

#清楚防火墙策略
[root@router ~]# iptables -F
#配置SNAT规则
[root@router ~]# iptables -t nat -I POSTROUTING -s 10.10.10.0/24 -j SNAT --to-source 192.168.0.81
#开启路由转发功能
[root@router ~]# sysctl -w net.ipv4.ip_forward=1
net.ipv4.ip_forward = 1

配置DNAT将外网访问192.168.0.81的80、8080 端口映射到内网的Lvs虚拟服务:

[root@router ~]# iptables -t nat -I PREROUTING -d 192.168.0.81 -p tcp  --dport 80 -j DNAT --to-destination 10.10.10.10:80
[root@router ~]# iptables -t nat -I PREROUTING -d 192.168.0.81 -p tcp  --dport 8080 -j DNAT --to-destination 10.10.10.10:8080

4、配置mpn server

关闭mpn server的firewalld和和设置selinux为permissive:

[root@mpn ~]# systemctl stop firewalld
[root@mpn ~]# setenforce 0

- 搭建mysql
安装mariadb-server:

[root@mpn ~]# yum install -y mariadb-server
......
作为依赖被升级:
  mariadb-libs.x86_64 1:5.5.56-2.el7                                                                                                                      

完毕!

编辑/etc/my.cnf配置文件:

[root@mpn ~]# vim /etc/my.cnf
skip-name-resolve=ON
innodb-file-per-table=ON

启动mariadb server并对配置mysql root 的密码:

[root@mpn ~]# systemctl start mariadb
[root@mpn ~]# mysql_secure_installation 
......
Set root password? [Y/n] y
New password: 
Re-enter new password: 
Password updated successfully!
Reloading privilege tables..
 ... Success!
.....
Thanks for using MariaDB

授权wordpress用户:

[root@mpn ~]# mysql -uroot -p123456
MariaDB [(none)]> create database wordpress;
Query OK, 1 row affected (0.01 sec)
MariaDB [(none)]> grant all on wordpress.* to 'wordpress'@'10.10.10.%' identified by 'magedeu';
Query OK, 0 rows affected (0.04 sec)

- 搭建php-fpm
安装php程序包:

[root@mpn ~]# yum install epel-release -y
[root@mpn ~]# yum install php-fpm php-mysql php-mcrypt php-mbstring -y

编辑/etc/php-fpm.d/www.conf

[root@mpn ~]# vim /etc/php-fpm.d/www.conf 
#找到相应的参数并修改为如下配置
listen = 0.0.0.0:9000
listen.allowed_clients = 10.10.10.11 10.10.10.12
pm.status_path = /status
ping.path = /ping
php_value[session.save_path] = /var/lib/php/session

创建会话目录:

[root@mpn ~]# mkdir -pv /var/lib/php/session
mkdir: 已创建目录 "/var/lib/php/session"
[root@mpn ~]# chown apache:apache /var/lib/php/session

启动php-fpm服务:

[root@mpn ~]# systemctl start php-fpm

- 搭建nfs服务
安装nfs服务:

[root@mpn ~]# yum install -y nfs-utils

创建nfs共享目录:

[root@mpn ~]# mkdir -pv /data/nginx/html
mkdir: 已创建目录 "/data"
mkdir: 已创建目录 "/data/nginx"
mkdir: 已创建目录 "/data/nginx/html"

上传并解压缩wordpress和phpMyadmin到共享目录:

[root@mpn ~]# ll /data/nginx/html/
总用量 8
drwxr-xr-x. 9 root root 4096 3月  29 2017 phpMyAdmin-4.0.10.20-all-languages
drwxr-xr-x. 5 root root 4096 2月   8 12:53 wordpress

创建对应的软连接:

[root@mpn html]# ln -sv phpMyAdmin-4.0.10.20-all-languages/ pma
"pma" -> "phpMyAdmin-4.0.10.20-all-languages/"
[root@mpn html]# ln -sv wordpress/ blog
"blog" -> "wordpress/"

编辑/etc/exports:

[root@mpn ~]# vim /etc/exports
/data 10.10.10.*(ro,sync,root_squash)

分别启动rpcbind和nfs-server服务:

[root@mpn ~]# systemctl start rpcbind
[root@mpn ~]# systemctl start nfs-server

5、搭建配置RS1、2

创建目录/data:

[root@RS1 ~]# mkdir /data

挂载mpn的nfs共享目录到/data:

[root@RS1 ~]# mount -t nfs 10.10.10.13:/data /data
#若挂载报错说没有mount.nfs程序,需要按照nfs-utils
[root@RS1 ~]# yum install -y nfs-utils

安装nginx程序:

[root@RS1 ~]# yum install -y nginx

修改/etc/nginx/nginx.conf文件和编辑生成/etc/nginx/conf.d/services.conf:

[root@RS1 ~]# vim /etc/nginx/nginx.conf
#在server配置段中将这下面两行注释掉;
#        listen       80 default_server;
#        listen       [::]:80 default_server;
[root@RS1 ~]# vim /etc/nginx/conf.d/services.conf
server {
        listen 80;
        server_name www.ilinux.io;
        index index.html index.php;
        location / {
                root /data/nginx/html;
        }
        location ~* \.php$ {
                fastcgi_pass 10.10.10.13:9000;
                fastcgi_index index.php;
                include fastcgi_params;
                fastcgi_param   SCRIPT_FILENAME /data/nginx/html/$fastcgi_script_name;
        }
}

关闭firewalld,设置selinux为permissive:

[root@RS1 ~]# systemctl stop firewalld
[root@RS1 ~]# setenforce 0

启动nginx服务:

[root@RS1 ~]# systemctl start nginx

随后创建lvs-dr配置脚本,内容如下:

#!/bin/bash
#
vip=10.10.10.10.
mask='255.255.255.255'

case $1 in
start)
    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

    ifconfig lo:0 $vip netmask $mask broadcast $vip up
    route add -host $vip dev lo:0
    ;;
stop)
    ifconfig lo:0 down

    echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
    echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
    echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
    echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce

    ;;
*) 
    echo "Usage $(basename $0) start|stop"
    exit 1
    ;;
esac                    

执行脚本:

[root@RS1 ~]# bash -x rs.sh start
+ vip=10.10.10.10
+ mask=255.255.255.255
+ case $1 in
+ echo 1
+ echo 1
+ echo 2
+ echo 2
+ ifconfig lo:0 10.10.10.10 netmask 255.255.255.255 broadcast 10.10.10.10 up
+ route add -host 10.10.10.10 dev lo:0

6、配置director

安装ipvsadm命令工具:

[root@director ~]# yum install -y ipvsadm

创建lvs-dr配置脚本:

[root@director ~]# vim director.sh
#!/bin/bash
#
vip='10.10.10.10.'
iface='ens33:0'
mask='255.255.255.255'
port='80'
rs1='10.10.10.11'
rs2='10.10.10.12'
scheduler='rr'
type='-g'

case $1 in
start)
        ifconfig $iface $vip netmask $mask broadcast $vip up
        iptables -F

        ipvsadm -A -t ${vip}:${port} -s $scheduler
        ipvsadm -a -t ${vip}:${port} -r ${rs1} $type -w 1
        ipvsadm -a -t ${vip}:${port} -r ${rs2} $type -w 1
        ;;
stop)
        ipvsadm -C
        ifconfig $iface down
        ;;
*)
        echo "Usage $(basename $0) start|stop"
        exit 1
        ;;
esac

执行脚本:

[root@director ~]# bash -x director.sh start
+ vip=10.10.10.10
+ iface=ens33:0
+ mask=255.255.255.255
+ port=80
+ rs1=10.10.10.11
+ rs2=10.10.10.12
+ scheduler=rr
+ type=-g
+ case $1 in
+ ifconfig ens33:0 10.10.10.10 netmask 255.255.255.255 broadcast 10.10.10.10 up
+ iptables -F
+ ipvsadm -A -t 10.10.10.10:80 -s rr
+ ipvsadm -a -t 10.10.10.10:80 -r 10.10.10.11 -g -w 1
+ ipvsadm -a -t 10.10.10.10:80 -r 10.10.10.12 -g -w 1

关闭firewalld:

[root@director ~]# systemctl stop firewalld

7、测试访问

通过外网访问192.168.0.81来访问相关应用:


测试访问页面1
测试访问页面之wordpress初始化页面
测试访问之完成初始化的wordpress
pma的登录页面
pma的访问页面

在RS2上停用nginx服务,测试访问效果:
在client上测试访问:

[root@client ~]# for i in {1..10};do curl http://192.168.0.81/index.html;done<h1>This is RS Server</h1>
curl: (7) Failed connect to 192.168.0.81:80; Connection refused
<h1>This is RS Server</h1>
curl: (7) Failed connect to 192.168.0.81:80; Connection refused
<h1>This is RS Server</h1>
curl: (7) Failed connect to 192.168.0.81:80; Connection refused
<h1>This is RS Server</h1>
curl: (7) Failed connect to 192.168.0.81:80; Connection refused
<h1>This is RS Server</h1>
curl: (7) Failed connect to 192.168.0.81:80; Connection refused

如上述结果,负载到正常运行的RS上的请求依旧能正常访问,但是负载到异常的服务器上的连接会请求失败。为了让director能够检测后端提供的应用服务是否存活,并根据其存活的状态自动增减ipvsadm的RS服务器,可在director上安装ldirectord来实现此需求。具体配置如下:
在director上安装ldirectord

[root@director ~]# yum install ldirectord-3.9.5-3.1.x86_64.rpm

复制示例配置文件到指定目录:

[root@director ~]# cp /usr/share/doc/ldirectord-3.9.5/ldirectord.cf /etc/ha.d/

编辑/etc/ha.d/ldirectord-cf文件:

[root@director ~]# vim /etc/ha.d/ldirectord.cf 
virtual=10.10.10.10:80
        real=10.10.10.11:80 gate
        real=10.10.10.12:80 gate
        fallback=127.0.0.1:80 gate  #可在director配置一个提示页面作为维护页面提示
        service=http
        scheduler=rr
        #persistent=600
        #netmask=255.255.255.255
        protocol=tcp
        checktype=negotiate
        checkport=80
        request="index.html"

启动ldirectord服务:

[root@director ~]# systemctl status ldirectord

此时在R1或RS2上停用nginx服务,director会自动检测其对应的应用服务是否存活,如果检测失败,则删除在ipvsadm中的real server条目;当检测恢复成功时,ldirectord会将对应的real server自动增加到ipvsadmn条目中。

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