web缓存服务器varnish

yum install -y autoconf automake jemalloc-devel libedit-devel libtool ncurses-devel pcre-devel pkgconfig python-docutils python-sphinx

# rpm --nosignature -i https://repo.varnish-cache.org/redhat/varnish-4.1.el7.rpm 
# yum install varnish -y

# grep "^[a-Z]" /etc/varnish/varnish.params 
RELOAD_VCL=1    # 重新启动服务时是否重新读取VCL并重新编译
VARNISH_VCL_CONF=/etc/varnish/default.vcl    # 默认读取的VCL文件
VARNISH_LISTEN_PORT=80    # 设置监听的端口(默认监听6081端口)
VARNISH_ADMIN_LISTEN_ADDRESS=127.0.0.1    # 管理接口监听的地址
VARNISH_ADMIN_LISTEN_PORT=6082    # 管理接口监听的端口
VARNISH_SECRET_FILE=/etc/varnish/secret    # 使用的密钥文件
VARNISH_STORAGE="malloc,256M"    # 存储文件的大小
VARNISH_USER=varnish    # varnish默认用户
VARNISH_GROUP=varnish    # varnish默认组

# cat /etc/varnish/default.vcl |grep -v "#"

vcl 4.0;

backend web01 {
    .host = "192.168.3.12";
    .port = "80";
}

# vim /etc/varnish/default.vcl
vcl 4.0;                    # 指明varnish版本                        
backend web01 {                    # 定义后端服务器1
    .host = "192.168.3.12";
    .port = "80";
}

backend web02 {                    # 定义后端服务器2
    .host = "192.168.3.13";
    .port = "80";
}

import directors;                # 定义directors
sub vcl_init {                    # 定义vcl_init子例程
        new cluster1 = directors.round_robin();
        cluster1.add_backend(web01);
        cluster1.add_backend(web02);
}

sub vcl_recv {                    # 定义vcl_recv子例程
        set req.backend_hint = cluster1.backend(); #指定后端directors
}

sub vcl_deliver {                   # 定义子例程
        if (obj.hits > 0) {      
                set resp.http.X-Cache = "HIT via" + " " + server.ip;
        } else {
                set resp.http.X-Cache = "MISS via" + " " + server.ip;
        }             # 判断如果命中就在http响应首部设置X-Cache为HIT，否则就在http响应首部设置X-Cache为MISS。
}

sub vcl_recv {
        if (req.url ~ "^/test.html$") {
                return(pass);
        }            ##定义请求的文件中如果匹配test.html就pass，不查缓存
}

backend web01 {
    .host = "192.168.10.132";
    .port = "80";
    .probe = {
        .url = "/";            # 指定哪个url需要varnish请求
        .timeout = 2s;         # 指定超时等待时间
        .interval = 5s;         # 指定检查时间间隔
        .window = 5;            # 最多尝试5次
        .threshold = 3;          # 至少有3次成功就宣告backend健康
    }
}

backend web02 {
    .host = "192.168.3.13";
    .port = "80";
    .probe = {
        .url = "/";
        .timeout = 2s;
        .interval = 5s;
        .window = 5;
        .threshold = 3;
    }
}

sub vcl_backend_response {
    if (bereq.url ~ "\.(jpg|jpeg|gif|png)$") {
        set beresp.ttl = 2h;
    }                 # 如果url是以图片格式结尾的缓存2小时
    if (bereq.url ~ "\.(html|css|js|jsp)$") {
        set beresp.ttl = 30m;
    }                  # 如果url是以html|css|js|jsp结尾的缓存30分钟
}