Varnish 4.0 实战(转)

sub vcl_recv {
if (! req.backend.healthy) {
set req.grace = 5m;
} else {
set req.grace = 15s;
}
}
sub vcl_fetch {
set beresp.grace = 30m;
}
# 以上配置表示varnish将会将失效的缓存对象再多保留30分钟，此值等于最大的req.grace值即可；
# 而根据后端主机的健康状况，varnish可向前端请求分别提供5分钟内或15秒内的过期内容

# 安装包下载地址：http://repo.varnish-cache.org/redhat/varnish-4.0/el6/
yum localinstall --nogpgcheck varnish-4.0.0-1.el6.x86_64.rpm varnish-libs-4.0.0-1.el6.x86_64.rpm varnish-docs-4.0.0-1.el6.x86_64.rpm
vi /etc/sysconfig/varnish # 编辑配置文件，修改如下项
VARNISH_STORAGE_SIZE=100M # 此值根据自身情况调整，测试环境可调低此值
VARNISH_STORAGE="malloc,${VARNISH_STORAGE_SIZE}" # Varnish 4中默认使用malloc(即内存)作为缓存对象存储方式；
service varnish start # 启动varnish，默认外部请求的监听端口6081，管理端口6082，后端主机127.0.0.1:80
===========
varnishadm -S /etc/varnish/secret -T 127.0.0.1:6082 # 登录管理命令行
varnish> vcl.list                 # 列出所有的配置
varnish> vcl.load test1 test.vcl  # 加载编译新配置，test1是配置名，test.vcl是配置文件
varnish> vcl.use test1            # 使用配置，需指定配置名，当前使用的配置以最后一次vcl.use为准
varnish> vcl.show test1           # 显示配置内容，需指定配置名

#
# This is an example VCL file for Varnish.
#
# It does not do anything by default, delegating control to the
# builtin VCL. The builtin VCL is called when there is no explicit
# return statement.
#
# See the VCL chapters in the Users Guide at https://www.varnish-cache.org/docs/
# and http://varnish-cache.org/trac/wiki/VCLExamples for more examples.
# Marker to tell the VCL compiler that this VCL has been adapted to the
# new 4.0 format.
vcl 4.0;
import directors;
probe backend_healthcheck { # 创建健康监测
    .url = /health.html;
    .window = 5;
    .threshold = 2;
    .interval = 3s;
}
backend web1 {    # 创建后端主机
    .host = "static1.lnmmp.com";
    .port = "80";
    .probe = backend_healthcheck;
}
backend web2 {
    .host = "static2.lnmmp.com";
    .port = "80";
    .probe = backend_healthcheck;
}
backend img1 {
    .host = "img1.lnmmp.com";
    .port = "80";
    .probe = backend_healthcheck;
}
backend img2 {
    .host = "img2.lnmmp.com";
    .port = "80";
    .probe = backend_healthcheck;
}
vcl_init {    # 创建后端主机组，即directors
    new web_cluster = directors.random();
    web_cluster.add_backend(web1);
    web_cluster.add_backend(web2);
    new img_cluster = directors.random();
    img_cluster.add_backend(img1);
    img_cluster.add_backend(img2);
}
acl purgers {    # 定义可访问来源IP
        "127.0.0.1";
        "192.168.0.0"/24;
}
sub vcl_recv {
    if (req.request == "GET" && req.http.cookie) {    # 带cookie首部的GET请求也缓存
        return(hash);
}
    if (req.url ~ "test.html") {    # test.html文件禁止缓存
        return(pass);
    }
    if (req.request == "PURGE") {    # PURGE请求的处理
        if (!client.ip ~ purgers) {
            return(synth(405,"Method not allowed"));
        }
        return(hash);
    }
    if (req.http.X-Forward-For) {    # 为发往后端主机的请求添加X-Forward-For首部
        set req.http.X-Forward-For = req.http.X-Forward-For + "," + client.ip;
    } else {
        set req.http.X-Forward-For = client.ip;
    }
    if (req.http.host ~ "(?i)^(www.)?lnmmp.com$") {    # 根据不同的访问域名，分发至不同的后端主机组
        set req.http.host = "www.lnmmp.com";
        set req.backend_hint = web_cluster.backend();
      } elsif (req.http.host ~ "(?i)^images.lnmmp.com$") {
            set req.backend_hint = img_cluster.backend();
      }
        return(hash);
    }
sub vcl_hit { # PURGE请求的处理
    if (req.request == "PURGE") {  
        purge;
        return(synth(200,"Purged"));
    }
}
sub vcl_miss {    # PURGE请求的处理
    if (req.request == "PURGE") {
        purge;
        return(synth(404,"Not in cache"));
    }
}
sub vcl_pass {    # PURGE请求的处理
    if (req.request == "PURGE") {
        return(synth(502,"PURGE on a passed object"));
    }
}
sub vcl_backend_response { # 自定义缓存文件的缓存时长，即TTL值
    if (req.url ~ "\.(jpg|jpeg|gif|png)$") {
        set beresp.ttl = 7200s;
    }
    if (req.url ~ "\.(html|css|js)$") {
        set beresp.ttl = 1200s;
    }
    if (beresp.http.Set-Cookie) { # 定义带Set-Cookie首部的后端响应不缓存，直接返回给客户端
        return(deliver);
    }
}
sub vcl_deliver {
    if (obj.hits > 0) {    # 为响应添加X-Cache首部，显示缓存是否命中
        set resp.http.X-Cache = "HIT from " + server.ip;
    } else {
        set resp.http.X-Cache = "MISS";
    }
}