Varnish4.0实战 | 部署 | 后端服务器缓存 | 负载均衡 | 按域名访问 |CDN 推送

蔚落 2023-08-17 16:24 115阅读 0赞

# 一、部署varnish #

实验环境

172.25.1.1		varnish端
    172.25.1.2		后端服务器
    172.25.1.3		后端服务器

部署  
Varnish 官网： http://varnish-cache.org/

Varnish 4.0 安装说明网址：https://packagecloud.io/varnishcache/varnish40/install\#manual-rpm

以 RHEL7 为例：

yum install pygpgme yum-utils
    #配置 yum 源,注意里面的 7 是我的系统版本，el 指的是红帽系统
    vim /etc/yum.repos.d/varnishcache_varnish40.repo
    
    [varnishcache_varnish40]
    name=varnishcache_varnish40
    baseurl=https://packagecloud.io/varnishcache/varnish40/el/7/$basearch
    repo_gpgcheck=1
    gpgcheck=0
    enabled=1
    gpgkey=https://packagecloud.io/varnishcache/varnish40/gpgkey
    sslverify=1
    sslcacert=/etc/pki/tls/certs/ca-bundle.crt
    metadata_expire=300
    
    [varnishcache_varnish40-source]
    name=varnishcache_varnish40-source
    baseurl=https://packagecloud.io/varnishcache/varnish40/el/7/SRPMS
    repo_gpgcheck=1
    gpgcheck=0
    enabled=1
    gpgkey=https://packagecloud.io/varnishcache/varnish40/gpgkey
    sslverify=1
    sslcacert=/etc/pki/tls/certs/ca-bundle.crt
    metadata_expire=300

更新yum缓存

yum -q makecache -y --disablerepo='*' --enablerepo='varnishcache_varnish40'

去网上下载一个 jemalloc ，安装varnish需要年这个依赖

rpm -ivh jemalloc-3.6.0-1.el7.x86_64.rpm

安装 varnish4.0 版本

yum install varnish-devel.x86_64 varnish.x86_64 -y

# 二、实现单个后端服务器缓存 #

## 1、修改varnish策略 ##

vim /etc/varnish/default.vcl
    backend default {
        .host = "172.25.1.2";	#后端服务器IP
        .port = "80";			#后端服务器端口
    }
    
    
    sub vcl_deliver {
            if (obj.hits > 0) {
                    set resp.http.X-Cache = "访问的是varnish端";
            }else {
                    set resp.http.X-Cache = "访问的是server2端";
            }
            return (deliver);
    }

![在这里插入图片描述][20190928145622406.png]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70]

vim /etc/varnish/varnish.params
    ####修改
    VARNISH_LISTEN_PORT=80		# varnish端口

![在这里插入图片描述][20190928145441673.png]  
重启

systemctl restart varnish

## 2、后端服务器安装Apache ##

yum install httpd -y
    echo 'httpd' > /var/www/html/index.html
    systemctl start httpd

## 3、测试 ##

*  注：本实验测试机都是任意机

curl -I 172.25.1.1

*  第一次curl，可以看到Age=0,缓存时间为0，访问的是后端服务器

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 1]

*  第二次第三次，可以看到Age不等于0，这是缓存了多久，可以看到访问的是varnish缓存端

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 2]

*  清理所有缓存

varnishadm ban req.url "~" /

*  清楚页面缓存

varnishadm ban req.url "~" /index.html

# 三、多个域名访问不同服务器 #

## 1、修改varnish策略 ##

vim /etc/varnish/default.vcl
    ###############修改
    backend web1 {
        .host = "172.25.1.2";
        .port = "80";
    }
    backend web2 {
        .host = "172.25.1.3";
        .port = "80";
    }
    
    sub vcl_recv {
            if (req.http.host ~ "^(www.)?server.org"){
                    set req.http.host = "www.server.org";
                    set req.backend_hint = web1;
                    return(pass);			#不缓存，可以删去
            } elseif (req.http.host ~ "^bbs.server.org") {
                    set req.http.host = "bbs.server.org";
                    set req.backend_hint = web2;
            }else{
                    return (synth(405));
            }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 4]

## 2、测试 ##

*  在测试机上添加本地解析（实验缘故，没有办法）

vim /etc/hosts
    ########写入
    172.25.1.1 server1 www.server.org server.org bbs.server.org

![在这里插入图片描述][20190928152303573.png]

*  测试

![在这里插入图片描述][20190928152348945.png]

# 四、负载均衡功能 #

此时工作在七层应用层，其实不太好，要多做一整套三次握手，负担加倍

## 1、修改varnish策略 ##

vim /etc/varnish/default.vcl
    ################仅需以下部分
    import directors from "/lib64/varnish/vmods/libvmod_directors.so";		#倒入负载均衡模块
    
    backend web1 {
        .host = "172.25.1.2";
        .port = "80";
    }
    backend web2 {
        .host = "172.25.1.3";
        .port = "80";
    }
    
    sub vcl_init {
            new lb=directors.round_robin();
            lb.add_backend(web1);
            lb.add_backend(web2);
    }
    
    sub vcl_recv {
            if (req.http.host ~ "^(www.)?server.org"){
                    set req.http.host = "www.server.org";
                    set req.backend_hint = lb.backend();
                    return(pass);			#不缓存
            } elseif (req.http.host ~ "^bbs.server.org") {
                    set req.http.host = "bbs.server.org";
                    set req.backend_hint = web2;
            }else{
                    return (synth(405));
            }
    }

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 5]

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 6]  
重启

systemctl restart varnish

## 2、测试 ##

![在这里插入图片描述][20190928153649267.png]

## 五、Apache虚拟主机 ##

在server2端

# 1、编辑Apache配置目录 #

vim /etc/httpd/conf.d/vhost.conf
    ###########写入
    <VirtualHost *:80>
            DocumentRoot /www
            ServerName www.server.org
    </VirtualHost>
    <Directory "/www">
            require all granted
    </Directory>
    
    <VirtualHost *:80>
            DocumentRoot /bbs
            ServerName bbs.server.org
    </VirtualHost>
    <Directory "/bbs">
            require all granted
    </Directory>

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 7]

## 2、添加发布内容 ##

mkdir /www
    echo 'www' > /www/index.html
    mkdir /bbs
    echo 'bbs' > /bbs/index.html
    systemctl restart httpd

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 8]

## 3、测试 ##

*  虚拟主机成功

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 9]

## 六、CDN网页清理缓存 ##

在varnish端

yum install httpd php -y

拥有以下安装包：  
![在这里插入图片描述][20190928160057514.png]  
解压：

[root@server1 ~]# unzip bansys.zip -d /var/www/html/
    -bash: unzip: command not found
    [root@server1 ~]# yum whatprovides unzip
    Loaded plugins: product-id, search-disabled-repos, subscription-
                  : manager
    This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register.
    unzip-6.0-16.el7.x86_64 : A utility for unpacking zip files
    Repo        : rhel7.3
    yum install unzip-6.0-16.el7.x86_64 -y

将解压文件放到Apache发布目录下：

cd /var/www/html/
    mv bansys/* .

![在这里插入图片描述][20190928160630251.png]

修改推送包配置文件：

vim config.php

![在这里插入图片描述][20190928161224825.png]  
留下以下内容：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 10]  
修改Apache端口：

vim /etc/httpd/conf/httpd.conf
    systemctl start httpd

![在这里插入图片描述][20190928161354353.png]  
浏览器访问：  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 11]

配置varnish配置文件

vim /etc/varnish/default.vcl
    #######写入
    
    acl server {
            "127.0.0.1";
            "172.25.1.0/24";		#0这个网段的ip
    }
    
    sub vcl_recv {
            if(req.method == "BAN"){
                    if (!client.ip ~ server){
                    return(synth(405,"Puring not allowed for" + client.ip));
    }
            ban("req.url ~ " + req.url);
                    return(purge);
            }
    }

重启

systemctl restart varnish

浏览器推送测试：

shell命令使varnish端产生缓存  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 12]  
浏览器清理缓存

*  .\* 代表清理所有缓存  
    ![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 13]  
    ![在这里插入图片描述][20190928163043380.png]

缓存清理成功！  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 14]

[20190928145622406.png]: /images/20230810/751fd514cd9f4a48927f71e67a27c57f.png
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[20190928152303573.png]: /images/20230810/7bc2100930a340a58eb60f6f2b7a8cd9.png
[20190928152348945.png]: /images/20230810/7e4bfc45ef414880a33dd75e523483d9.png
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[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80NDI5NzMwMw_size_16_color_FFFFFF_t_70 6]: /images/20230810/a92c6369c1374d9e81f34463c90a599c.png
[20190928153649267.png]: /images/20230810/0fac3e0e9a5e4cee8bc80f2f73dabe05.png
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[20190928160057514.png]: /images/20230810/b4b858a37ac14764ac5e5f835e56f437.png
[20190928160630251.png]: /images/20230810/6edd1af3a99b46bdb5ee76302e5e4318.png
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[20190928161354353.png]: /images/20230810/52e84fc49a4d41b5be7ca87f0bc17bc3.png
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