标签：负载均衡高可用
一、实验准备服务器A：haproxy服务器（主）
服务器B：haproxy服务器（备）
服务器C：LNMP服务器、varnish服务器
服务器D：LNMP服务器、varnish服务器
二、实验要求
前端负载均衡器实现keepalived高可用。并且实现对于图片和静态资源的请求，代理到后端webserver缓存varnish服务上，对于动态请求。直接代理到厚点web服务，后端健康检测基于/index.html（手动创建），监测连续三次监测通过，视为OK，连续5次监测失败，视为fall。
三、实验步骤
1、前端负载均衡器实现VIP的漂移
keepalived（主）
global_defs?{
???notification_email?{
root@localhost???
}
???notification_email_from?root@magedu.com
???smtp_server?127.0.0.1
???smtp_connect_timeout?30
???router_id?zuozuo_LVS
}
vrrp_instance?VI_1?{
????state?MASTER?????//
????interface?eth1
????virtual_router_id?70
????priority?100????//优先级
????advert_int?1
????authentication?{
????????auth_type?PASS
????????auth_pass?zuozuo
????}
????virtual_ipaddress?{
172.17.110.70/16????//VIP
????}
}
keepalived（备）
global_defs?{
???notification_email?{
root@localhost???
}
???notification_email_from?root@magedu.com
???smtp_server?127.0.0.1
???smtp_connect_timeout?30
???router_id?zuozuo_LVS
}
vrrp_instance?VI_1?{
????state?BACKUP
????interface?eth1
????virtual_router_id?70
????priority?90
????advert_int?1
????authentication?{
????????auth_type?PASS
????????auth_pass?zuozuo
????}
????virtual_ipaddress?{
172.17.110.70/16????//VIP
????
????}
}2、前端负载均衡器实现请求的分离
global ????#?to?have?these?messages?end?up?in?/var/log/haproxy.log?you?will ????#?need?to: ????# ????#?1)?configure?syslog?to?accept?network?log?events.??This?is?done ????#????by?adding?the?‘-r‘?option?to?the?SYSLOGD_OPTIONS?in ????#????/etc/sysconfig/syslog ????# ????#?2)?configure?local2?events?to?go?to?the?/var/log/haproxy.log ????#???file.?A?line?like?the?following?can?be?added?to ????#???/etc/sysconfig/syslog ????# ????#????local2.*???????????????????????/var/log/haproxy.log ????# ?log?????????127.0.0.1?local2 ????chroot??????/var/lib/haproxy ????pidfile?????/var/run/haproxy.pid ????maxconn?????40000 ????user????????haproxy ????group???????haproxy ????daemon ????#?turn?on?stats?unix?socket ????stats?socket?/var/lib/haproxy/stats #--------------------------------------------------------------------- #?common?defaults?that?all?the?‘listen‘?and?‘backend‘?sections?will #?use?if?not?designated?in?their?block #--------------------------------------------------------------------- defaults ????mode????????????????????http ????log?????????????????????global ????option??????????????????httplog ????option??????????????????dontlognull ????option?http-server-close ????option?forwardfor???????except?127.0.0.0/8 ????option??????????????????redispatch ????retries?????????????????3 ????timeout?http-request????10s ????timeout?queue???????????1m ????timeout?connect?????????10s ????timeout?client??????????1m ????timeout?server??????????1m ????timeout?http-keep-alive?10s ????timeout?check???????????10s ????maxconn?????????????????3000 listen?stats???//检测页面 mode?http bind?0.0.0.0:1080 stats?enable stats?hide-version stats?uri?/haproxyadmin stats?auth?admin:admin???//登录检测 stats?admin?if?TRUE #--------------------------------------------------------------------- #?main?frontend?which?proxys?to?the?backends #--------------------------------------------------------------------- frontend??static ????mode?http ????bind?*:6000???//标明端口 ????acl?url_static??path_beg????-i?/static?/images?/javascript?/stylesheets ????acl?url_static??path_end???????-i?.jpg?.gif?.png?.css?.js ????use_backend?static??????????if?url_static ? ?frontend?server bind??*:80 default_backend??server #--------------------------------------------------------------------- #?static?backend?for?serving?up?images,?stylesheets?and?such #--------------------------------------------------------------------- backend?static ????balance?????roundrobin?? ????option?httpchk?GET?/index.html ????server??????static1??172.17.252.63:6000?check ????server??????static2??172.17.253.59:6000?check #--------------------------------------------------------------------- #?round?robin?balancing?between?the?various?backends #--------------------------------------------------------------------- backend??server ????balance?????roundrobin ????option?httpchk?GET?/index.html ????server??server1?172.17.252.63:80?check?inter?3000??rise?3?fall?5 ????server??server2?172.17.253.59:80?check?inter?3000??rise?3?fall?5
3、varnish实现缓存策略
vcl?4.0;?//必须要写，注明版本
import?directors;
probe?check1?{??//制定健康检测策略
????????.url?=?"/index.html";
????????.timeout=1s;
????????.interval=2s;
????????.window=5;
????????.threshold=3;
??????}
backend?server1?{
.host?=?"172.17.252.63";???//lnmp服务器
.port?=?"80";
.probe?=?check1;
}
backend?server2?{
????????.host?=?"172.17.253.59";
????????.port?=?"80";
????????.probe?=?check1;
}
sub?vcl_init?{???//初始化
????new?web_cluster?=?directors.random();
????web_cluster.add_backend(server1,10);
????web_cluster.add_backend(server2,20);
}
?acl??purgers?{????#?定义可访问来源IP
?????????"127.0.0.1";
?????????"172.17.0.0"/16;
?}
sub?vcl_recv?{
?if?(req.method?==?"GET"?&&?req.http.cookie)?{??
????????return(hash);
}
?if?(req.method?!=?"GET"?&&
???req.method?!=?"HEAD"?&&
???req.method?!=?"PUT"?&&
???req.method?!=?"POST"?&&
???req.method?!=?"TRACE"?&&
???req.method?!=?"OPTIONS"?&&
???req.method?!=?"PURGE"?&&
???req.method?!=?"DELETE")?{
????return?(pipe);
???}
}?
sub?vcl_hash?{??//对访问的URL进行hash
?????hash_data(req.url);
}
sub?vcl_backend_response?{?#?自定义缓存文件的缓存时长，即TTL值
????if?(bereq.url?~?"\.(jpg|jpeg|gif|png)$")?{
????????set?beresp.ttl?=?3600s;??
????}
????if?(bereq.url?~?"\.(html|css|js)$")?{
????????set?beresp.ttl?=?7200s;
????}
?????set?beresp.grace?=?30m;
????????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";
????}
????????unset?resp.http.X-Powered-By;
????????unset?resp.http.Via;
}??
基于haproxy+keepalive+varnish实现lnmp企业级架构
标签：负载均衡高可用
原文地址：http://blog.51cto.com/13136984/2049155
