阮胜昌的技术记录站-LinuxMySQL数据库运维

摘要：开启数据核心转发：/proc/sys/net/ipv4/ip_forward              Vim/etc/sysctl.conf                     net.ipv4.ip_forward=1 iptables 显示扩展multiport,iprange,string,time,connlimit,

摘要：Varnish状态监测机制可以使用backend probe进行定义我们在backend每个后端服务器当前探测的健康状态探测方法通过.probe进行设定，其结果可由req.backend.healthy变量获取，也可通过varnishlog中的Backend_health查看或varnishadm的debug.health查看。例：backend web1 {     .host = "www.magedu.com";     .probe = { 

摘要：vim /etc/varnish/default.vclsub vcl_recv {    if (req.http.User-Agent ~ "iPad" ||       req.http.User-Agent ~ "iPhone" ||       req.http.User-Agent ~ "Android"){             set req.http.X-Device = "mobile";    } el

摘要：在sub vcl_recv 函数中加入下面代码，注意应放在第一段位置。if (req.http.referer ~ "http://*.*") {if ( !(req.http.referer ~ "http://lvtrm.readeing.com"|| req.http.referer ~ "http://*.google\.com"|| req.http.referer ~ "http://*.baidu\.com"|| req.http.referer ~ "http://*.google\.com.cn" || req.http.refer

摘要：要求：不缓存指定的文件vim /etc/varnish/default.vclsub vcl_recv {    if (req.url ~"^/test.html$"){        return(pass);        }   } varnishadm动态加载配置文件：varnishadm -S /etc/varnish/secret -T 127.0.0.1:6082vcl.list200   

摘要：代理后端一台主机内的多台虚拟主机配置  Backends and virtual hosts in VarnishVarnish fully supports virtual hosts. They might howeverwork in a somewhat counter-intuitive fashion since they are never declaredexplicitly. You set up the routing of incoming HTTP requests in vcl_recv. Ifyou want this routing to be done on the basis of virtual ho

摘要：定义后端主机列表：vim /etc/varnish/default.vcl# Default backend definition. Set this to point toyour content server.backend websrv1 {    .host ="192.168.2.223";    .port ="80";    .probe = {        .url ="/index.htm";    

摘要：定义后端主机列表：vim /etc/varnish/default.vcl# Default backend definition. Set this to point toyour content server.backend websrv1 {    .host ="192.168.2.223";    .port ="80";    .probe = {        .url ="/index.htm";    

摘要：Varnish是一款强大的反向代理加速软件，关于其工作原理可以参考上图，其具体流程及VCL语法我这里就不做说明，网上资料多，大家还可以对照参考其官方网站和《Varnish中文权威指南》。一、安装CentOS5.8系统环境下的依耐关系 12 yum install gccgcc-c++ yum install automakeautoconflibtool ncurses-devel libxslt groff pcre-devel pkgconfig libtool -y 二、下载varnish-

摘要：首先用户请求到达后，首先进入vcl_recvvcl_recv对其做判断，是否命中缓存(vcl_hash)如果不想使用缓存则直接交由vcl_pipe,建立管道并交由后端服务器如果期望本地缓存处理则自定义检测缓存lookup 很显然，如果要检查缓存是需要根据什么方式做检查判断缓存中是否存在对象 ，如果命中了yes 于是交予vcl_hit就算命中了也有两条路可以走：·deliver 直接由vcl_deliver在缓存中取