#加载后端负载均衡模块
import directors;
#加载 std 模块
import std;
#创建名为 backend_healthcheck 的健康检查策略
probe backend_healthcheck {
.url="/";
.interval = 5s;
.timeout = 1s;
.window = 5;
.threshold = 3;
}
#定义后端服务器
backend web_app_01 {
.host = "192.168.154.137"; #这里改成你的web服务器地址
.port = "80";
.first_byte_timeout = 9s;
.connect_timeout = 3s;
.between_bytes_timeout = 1s;
.probe = backend_healthcheck;
}
backend web_app_02 {
.host = "192.168.154.138"; #这里改成你的web服务器地址
.port = "80";
.first_byte_timeout = 9s;
.connect_timeout = 3s;
.between_bytes_timeout = 1s;
.probe = backend_healthcheck;
}
#定义允许清理缓存的 IP
acl purgers {
"127.0.0.1";
"localhost";
"192.168.154.0/24";
}
#vcl_init 初始化子程序创建后端主机组
sub vcl_init {
new web = directors.round_robin();
web.add_backend(web_app_01);
web.add_backend(web_app_02);
}
#请求入口， 用于接收和处理请求。 这里一般用作路由处理， 判断是否读取缓存和指定该请求使用哪个后端
sub vcl_recv {
#将请求指定使用 web 后端集群 .在集群名后加上 .backend()
set req.backend_hint = web.backend();
# 匹配清理缓存的请求
if (req.method == "PURGE") {
if (!client.ip ~ purgers) {
return (synth(405, "Not Allowed."));
}
# 是的话就执行清理
return (purge);
}
# 如果不是正常请求 就直接穿透没商量
if (req.method != "GET" &&req.method != "HEAD" &&
req.method != "PUT" &&
req.method != "POST" &&
req.method != "TRACE" &&
req.method != "OPTIONS" &&
req.method != "PATCH" &&
req.method != "DELETE") {
return (pipe);
}
# 如果不是 GET 和 HEAD 就跳到 pass
if (req.method != "GET" && req.method != "HEAD") {
return (pass);
}
#如果匹配动态内容访问请求就跳到 pass
if (req.url ~ "\.(php|asp|aspx|jsp|do|ashx|shtml)($|\?)") {
return (pass);
}
#具有身份验证的请求跳到 pass
if (req.http.Authorization) {
return (pass);
}
if (req.http.Accept-Encoding) {
if (req.url ~
"\.(bmp|png|gif|jpg|jpeg|ico|gz|tgz|bz2|tbz|zip|rar|mp3|mp4|ogg|swf|flv)$") {
unset req.http.Accept-Encoding;
} elseif (req.http.Accept-Encoding ~ "gzip") {
set req.http.Accept-Encoding = "gzip";
} elseif (req.http.Accept-Encoding ~ "deflate") {
set req.http.Accept-Encoding = "deflate";
} else {
unset req.http.Accept-Encoding;
}
}
if (req.url ~
"\.(css|js|html|htm|bmp|png|gif|jpg|jpeg|ico|gz|tgz|bz2|tbz|zip|rar|mp3|mp4|ogg|swf|flv)($|\?)") {
unset req.http.cookie;
return (hash);
}
# 把真实客户端 IP 传递给后端服务器 后端服务器日志使用 X-Forwarded-For 来接收
if (req.restarts == 0) {
if (req.http.X-Forwarded-For) {set req.http.X-Forwarded-For = req.http.X-Forwarded-For + ", " + client.ip;
} else {
set req.http.X-Forwarded-For = client.ip;
}
}
return (hash);
}
# hash 事件(缓存事件)
sub vcl_hash {
hash_data(req.url);
if (req.http.host) {
hash_data(req.http.host);
} else {
hash_data(server.ip);
}
return (lookup);
}
# 缓存命中事件
sub vcl_hit {
if (req.method == "PURGE") {
return (synth(200, "Purged."));
}
return (deliver);
}
# 缓存不命中事件
sub vcl_miss {
if (req.method == "PURGE") {
return (synth(404, "Purged."));
}
return (fetch);
}
# 返回给用户的前一个事件 通常用于添加或删除 header 头
sub vcl_deliver {
if (obj.hits > 0) {
set resp.http.X-Cache = "HIT";
set resp.http.X-Cache-Hits = obj.hits;
} else {
set resp.http.X-Cache = "MISS";
}
#取消显示 php 框架版本的 header 头
unset resp.http.X-Powered-By;
#取消显示 web 软件版本、 Via(来自 varnish)等 header 头 为了安全
unset resp.http.Server;
unset resp.http.X-Drupal-Cache;unset resp.http.Via;
unset resp.http.Link;
unset resp.http.X-Varnish;
#显示请求经历 restarts 事件的次数
set resp.http.xx_restarts_count = req.restarts;
#显示该资源缓存的时间单位秒
set resp.http.xx_Age = resp.http.Age;
#显示该资源命中的次数
set resp.http.hit_count = obj.hits;
#取消显示 Age 为了不和 CDN 冲突
unset resp.http.Age;
#返回给用户
return (deliver);
}
# pass 事件
sub vcl_pass {
return (fetch);
}
#处理对后端返回结果的事件(设置缓存、移除 cookie 信息、设置 header 头等) 在 fetch 事件后自动调用
sub vcl_backend_response {
#开启 grace 模式 表示当后端全挂掉后 即使缓存资源已过期(超过缓存时间) 也会把该资源返回给用户 资源最大有效时间为 5 分钟
set beresp.grace = 5m;
#后端返回如下错误状态码 则不缓存
if (beresp.status == 499 || beresp.status == 404 || beresp.status == 502) {
set beresp.uncacheable = true;
}
#如请求 php 或 jsp 则不缓存
if (bereq.url ~ "\.(php|jsp)(\?|$)") {
set beresp.uncacheable = true;
} else { //自定义缓存文件的缓存时长，即 TTL 值
if (bereq.url ~ "\.(css|js|html|htm|bmp|png|gif|jpg|jpeg|ico)($|\?)") {
set beresp.ttl = 15m;
unset beresp.http.Set-Cookie;
} elseif (bereq.url ~ "\.(gz|tgz|bz2|tbz|zip|rar|mp3|mp4|ogg|swf|flv)($|\?)") {
set beresp.ttl = 30m;
unset beresp.http.Set-Cookie;
} else {
set beresp.ttl = 10m;
unset beresp.http.Set-Cookie;
}
}
#返回给用户return (deliver);
}
sub vcl_purge {
return (synth(200,"success"));
}
sub vcl_backend_error {
if (beresp.status == 500 ||
beresp.status == 501 ||
beresp.status == 502 ||
beresp.status == 503 ||
beresp.status == 504) {
return (retry);
}
}
sub vcl_fini {
return (ok);
}
启动varnish
/usr/local/sbin/varnishd -f /usr/local/var/varnish/default.vcl -s malloc,100M -a 0.0.0.0:80
firewall-cmd --add-port=80/tcp --permanent
firewall-cmd --reload
setenforce 0
使用/usr/local/sbin/varnishd -h可以查看启动命令的帮助
然后通过ss或者netstat查看是否正常启动
##varnish官网：
##varnish官方文档：
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