HAProxy+Varnish+LNMP实现高可用负载均衡动静分离集群部署
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HAProxy高可用负载均衡集群部署
基本信息:
系统平台:VMware WorkStation
系统版本: CentOS Linux release 7.2.1511 (Core)
内核版本: 3.10.0-327.el7.x86_64
集群架构:
前端:HAProxy
1、虚拟FQDN:www.simpletime.net
2、VIP:192.168.39.1;DIP:172.16.39.50
3、调度服务器:Varnish1、Varnish2
4、调度算法:URL_Hash_Consistent
5、集群统计页:172.16.39.50:9091/simpletime?admin
缓存服务器:Varnish
1、VarnishServer1:172.16.39.14:9527
2、VarnishServer2:172.16.39.15:9527
3、开启健康状态探测,提供高可用
4、负载均衡后端Web服务器组
5、动静分离后端服务器,并动静都提供负载均衡效果
后端服务器:
StaticServer1:172.16.39.14:80
StaticServer2:172.16.39.15:80
DynamicServer1:172.16.39.151
DynamicServer2:172.16.39.152
mysql服务器:
MysqlServer:172.16.39.150
思考:
1、负载均衡动静分离后,会话如何保持?
2、负载均衡动静分离后,存储如何解决?
3、该方案适用于什么样的场景?
4、该方案缺陷有哪些?
5、如何改进?
一、部署HAProxy
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1、安装HAProxy ~] # yum install HAProxy 2、配置HAProxy #--------------------------------------------------------------------- # main frontend which proxys to the backends #--------------------------------------------------------------------- frontend web *:80 #acl url_static path_beg -i /static /images /javascript /stylesheets #acl url_static path_end -i .jpg .gif .png .css .js .html .txt .htm #acl url_dynamic path_begin -i .php .jsp #default_backend static_srv if url_static #use_backend dynamic_srv if url_dynamic use_backend varnish_srv #--------------------------------------------------------------------- # round robin balancing between the various backends #--------------------------------------------------------------------- backend varnish_srv balance uri #使用基于URL的一致性哈希调度算法 hash - type consistent server varnish1 172.16.39.14:9527 check server varnish2 172.16.39.15:9527 check listen stats #开启HAProxy图形化Web管理功能 bind :9091 stats enable stats uri /simpletime ?admin stats hide-version stats auth admin:abc.123 stats admin if TRUE 3、启动服务 ~] # systemctl start haproxy ~] # systemctl status haproxy #查看状态 ~] # ss -tnlp #查看80和9091端口是否启用 ~] # systemctl enable haproxy #设置开机启动 |
二、部署Varnish,两台配置一致(172.16.39.14|15)
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1、安装及配置 ~] # yum install varnish -y ~] # vim /etc/varnish/varnish.params VARNISH_LISTEN_PORT=9527 #更改默认端口 ~] # systemctl start varnish ~] # systemctl enable varnish ~] # vim /etc/varnish/default.vcl vcl 4.0; ##############启用负载均衡模块############### import directors; ################定义Purge-ACL控制####################### acl purgers { "127.0.0.1" ; "172.16.39.0" /16 ; } # Default backend definition. Set this to point to your content server. ##############配置健康状态探测############## probe HE { #静态检测 .url = "/health.html" ; #指定检测URL .timeout = 2s; #探测超时时长 .window = 5; #探测次数 .threshold = 2; #探测次数成功多少次才算健康 .initial = 2; #Varnish启动探测后端主机2次健康后加入主机 .interval = 2s; #探测间隔时长 .expected_response = 200; #期望状态响应码 } probe HC { #动态监测 .url = "/health.php" ; .timeout = 2s; .window = 5; .threshold = 2; .initial = 2; .interval = 2s; .expected_response = 200; } #############添加后端主机################ backend web1 { .host = "172.16.39.151:80" ; .port = "80" ; .probe = HC; } backend web2 { .host = "172.16.39.152:80" ; .port = "80" ; .probe = HC; } backend app1 { .host = "172.16.39.14:80" ; .port = "80" ; .probe = HE; } backend app2 { .host = "172.16.39.15:80" ; .port = "80" ; .probe = HE; } #############定义负载均衡及算法############### sub vcl_init { new webcluster = directors.round_robin(); webcluster.add_backend(web1); webcluster.add_backend(web2); new appcluster = directors.round_robin(); appcluster.add_backend(app1); appcluster.add_backend(app2); } ################定义vcl_recv函数段###################### sub vcl_recv { #####ACL未授权,不允许PURGE,并返回405##### if (req.method == "PURGE" ) { if (!client.ip ~ purgers){ return (synth(405, "Purging not allowed for" + client.ip)); } return (purge); } #####添加首部信息,使后端服务记录访问者的真实IP # if (req.restarts == 0) { # set req.http.X-Forwarded-For = req.http.X-Forwarded-For + ", " + client.ip; # } else { # set req.http.X-Forwarded-For = client.ip; # } # set req.backend_hint = webcluster.backend(); # set req.backend_hint = appcluster.backend(); #注:因为Varnish不是一级代理,配置forward只能取到上级代理IP,而上级代理IP,本身就包含在HAProxy发送过来的Forward里,所以没必要配置,而后端服务器只要日志格式有启用记录Forward信息,并且上级代理没有做限制,那么,就能获取到客户端真实IP; #####动静分离##### if (req.url ~ "(?i)\.(php|asp|aspx|jsp|do|ashx|shtml)($|\?)" ) { set req.backend_hint = appcluster.backend(); } #####不正常的请求不缓存##### if (req.method != "GET" && req.method != "HEAD" && req.method != "PUT" && req.method != "POST" && req.method != "TRACE" && req.method != "OPTIONS" && req.method != "PATCH" && req.method != "DELETE" ) { return (pipe); } #####如果请求不是GET或者HEAD,不缓存##### if (req.method != "GET" && req.method != "HEAD" ) { return (pass); } #####如果请求包含Authorization授权或Cookie认证,不缓存##### if (req.http.Authorization || req.http.Cookie) { return (pass); } #####启用压缩,但排除一些流文件压缩##### if (req.http.Accept-Encoding) { if (req.url ~ "\.(bmp|png|gif|jpg|jpeg|ico|gz|tgz|bz2|tbz|zip|rar|mp3|mp4|ogg|swf|flv)$" ) { 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; } } return ( hash ); } ####################定义vcl_pipe函数段################# sub vcl_pipe { return (pipe); } sub vcl_miss { return (fetch); } ####################定义vcl_hash函数段################# sub vcl_hash { hash_data(req.url); if (req.http.host) { hash_data(req.http.host); } else { hash_data(server.ip); } if (req.http.Accept-Encoding ~ "gzip" ) { hash_data ( "gzip" ); } elseif (req.http.Accept-Encoding ~ "deflate" ) { hash_data ( "deflate" ); } } ##############设置资源缓存时长################# sub vcl_backend_response { if (beresp.http.cache-control !~ "s-maxage" ) { if (bereq.url ~ "(?i)\.(jpg|jpeg|png|gif|css|js|html|htm)$" ) { unset beresp.http.Set-Cookie; set beresp.ttl = 3600s; } } } ################启用Purge##################### sub vcl_purge { return (synth(200, "Purged" )); } ###############记录缓存命中状态############## sub vcl_deliver { if (obj.hits > 0) { set resp.http.X-Cache = "HIT from " + req.http.host; set resp.http.X-Cache-Hits = obj.hits; } else { set resp.http.X-Cache = "MISS from " + req.http.host; } unset resp.http.X-Powered-By; unset resp.http.Server; unset resp.http.Via; unset resp.http.X-Varnish; unset resp.http.Age; } 2、加载配置,因为还没有配置后端应用服务器,可以看到后端主机健康检测全部处于Sick状态 ~] # varnishadm -S /etc/varnish/secret -T 127.0.0.1:6082 varnish> vcl.load conf1 default.vcl 200 VCL compiled. varnish> vcl.use conf1 200 VCL ‘conf1‘ now active varnish> backend.list 200 Backend name Refs Admin Probe web1(172.16.39.151,,80) 15 probe Sick 0 /5 web2(172.16.39.152,,80) 15 probe Sick 0 /5 app1(172.16.39.14,,80) 15 probe Sick 0 /5 app2(172.16.39.15,,80) 15 probe Sick 0 /5 |
三、部署Mysql(172.16.39.150)
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~] # yum install mariadb.server ~] # rpm -qe mariadb-server mariadb-server-5.5.44-2.el7.centos.x86_64 ~] # vim /etc/my.cnf #数据库基本优化 [mysqld] innodb_file_per_table = ON skip_name_resolve = ON ~] # mysql #创建wordpress数据库并授权该数据库用户 > create database wwwdb; > exit |
四、部署NFS文件系统
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1、后端所有主机安装服务 ~] # yum install nfs-utils 2、动态资源主机172.16.39.152设为动态web数据共享服务器 DynamicServer2 ~] # vim /etc/exports /data/web/ 172.16.39.151 /16 (rw, sync ) #rw=可读写,sync=内存及硬盘同步写入数据 3、静态主机172.16.39.15设为静态web数据共享服务器 StaticServer2 ~] # vim /etc/exports /data/web/ 172.16.39.14 /16 (rw, sync ) #rw=可读写,sync=内存及硬盘同步写入数据 ~] # systemctl start nfs-server #启动服务 DynamicServer2 ~] # exportfs -avr #重载配置 exporting 172.16.39.151 /16 : /data/web StaticServer2 ~] # exportfs -avr #重载配置 exporting 172.16.39.14 /16 : /data/web 4、两台服务端设为开机启动 ~] # systemctl enable nfs-server 5、客户端同步,动态主机挂载动态服务器共享,静态主机挂载静态服务器共享 ~] # showmount -e 172.16.39.152 Export list for 172.16.39.152: /data/web 172.16.39.151 /16 ~] # mount -t nfs 172.16.39.15:/data/web /data/web |
五、部署后端主机(注意:已经部署了NFS文件系统)
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1、安装及配置(DynamicServer2:172.16.39.152) ~] # yum install nginx php-fpm php-mysql -y ~] # mkdir /data/web/www -pv ~] # vim /etc/nginx/conf.d/www.simple.com.conf server { listen 80; root /data/web/www ; server_name www.simple.com; index index.html index.htm index.php; location ~ [^/]\.php(/|$) { try_files $uri = 404; fastcgi_pass 127.0.0.1:9000; fastcgi_index index.php; include fastcgi.conf; #access_log_bypass_if ($uri = ‘/health.php‘); } } 备注:access_log_bypass_if 需添加日志过滤模块,本文主要实现过滤健康状态检测信息; ~] # systemctl start nginx php-fpm 2、部署wordpress应用 ~] # unzip wordpress-4.3.1-zh_CN.zip ~] # mv wordpress/* /data/web/www/ www] # cp wp-config{-sample,}.php www] # vim wp-config.php define( ‘DB_NAME‘ , ‘wwwdb‘ ); define( ‘DB_USER‘ , ‘www‘ ); define( ‘DB_PASSWORD‘ , ‘abc.123‘ ); define( ‘DB_HOST‘ , ‘172.16.39.150‘ ); 3、设置facl权限 ~] # id apache ~] # setfacl -m u:apache:rwx /data/web/www 4、拷贝web数据至StaticServer2,另两台后端主机挂载的是两台NFS服务端的数据文件,web数据数完成 ~] # tar -jcvf web.tar.gz /data/web/www ~] # scp web.tar.gz 172.16.39.15: ~] # setfacl -m u:apache:rwx /data/web/www StaticServer2 ~] # tar -xf web.tar.gz -C /data/web 5、创建动静资源主机组Varnish健康状态探测页面 DynamicServer2~] # echo "<h1>DynamicServer is Health.</h1> > /data/web/www/health.php StaticServer2~] # echo "<h1>StaticServer is Health.</h1>" > /data/web/www/health.html 6、在Varnish主机上查看健康状态(172.16.39.14|15,也就是StaticServer主机) StaticServer2~] # varnishadm -S /etc/varnish/secret -T 127.0.0.1:6082 varnish> backend.list #后端Web主机正常 200 Backend name Refs Admin Probe web1(172.16.39.151,,80) 15 probe Healthy 5 /5 web2(172.16.39.152,,80) 15 probe Healthy 5 /5 app1(172.16.39.14,,80) 15 probe Healthy 5 /5 app2(172.16.39.15,,80) 15 probe Healthy 5 /5 |
7、web访问172.16.39.50完成wordpress配置
8、创建图文测试,发现动静分离下,图片上传后无法显示
9、分析原因,动静分离后,用户可以上传图片至动态资源主机上,但静态资源却没有该图片,初步解决方案:使用文件同步软件,实时同步图片等流格式资源。
六、部署Rsync+inodify,实现静态资源主机同步上传资源图片目录,解决图片不能显示问题
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1、将StaticServer2配置为备份端,同步动态资源资源DynamicServer2下的web图片上传目录文件 ~] # rpm -qa rsync ~] # vim /etc/rsyncd.conf #尾行追加 uid = root #指定执行备份的用户及组权限为root用户 gid = root user chroot = no #关闭chroot max connections = 200 #最大连接数 timeout = 600 pid file = /var/run/rsyncd .pid lock file = /var/run/rsyncd .lock log file = /var/log/rsyncd .log [web] path= /data/web/www/wp-content/uploads ignore errors read only = no list = no hosts allow = 172.16.39.0 /255 .255.0.0 #只允许39网段进行同步 auth users = rsync #认证的用户名 secrets file = /etc/rsyncd .password #指定密码文件 2、创建 rsync 同步用户密码文件 ~] # echo “rsync:abc.123” > /etc/rsyncd.password ~] # chmod 600 /etc/rsyncd.password 3、启动服务 ~] # systemctl start rsyncd ~] # ss -tnlp |grep rsync #查看是否开启873端口 ~] # systemctl enable rsyncd #设置rsync开机启动 4、部署Rsync同步端DynamicServer2,实时同步本机web图片数据至StaticServer2,并保持以DynamicServer2为主两台服务器web图片资源一致性。 ~] # yum install rsync inodify-tools inodify-tools-devel 如果yum源没有找到inodify,就直接下载源码包进行编译 ~] # tar -xf inodify-tools-3.13.tar.gz ~] # ./configure --prefix=/usr/local/inotify ~] # ]# make -j 2 && make install ~] # ln -sv /usr/local/inotify/bin/inotifywait /usr/bin/ ~] # echo “abc.123” > /etc/rsyncd.password ~] # chmod 600 /etc/rsyncd.password #创建实时同步脚本 ~] # vim /etc/rsync.sh #!/bin/bash host=172.16.39.15 #数据备份主机 src= /data/web/www/wp-content/uploads/ #想要备份的目录 des=web user= rsync /usr/bin/rsync -vzrtopg --delete --progress --password- file = /etc/rsyncd .password $src [email protected]$host::$des /usr/bin/inotifywait -mrq --timefmt ‘%d/%m/%y %H:%M‘ -- format ‘%T %w%f%e‘ -e modify,delete,create,attrib $src \ | while read files do /usr/bin/rsync -vzrtopg --delete --progress --password- file = /etc/rsyncd .password $src [email protected]$host::$des echo "${files} was rsynced" >> /tmp/rsync .log 2>&1 done 5、添加开机自动运行脚本 ~] # chmod 764 /etc/rsync.sh ~] # echo "/usr/bin/bash /etc/rsync.sh &" >> /etc/rc.local #开机后台自动运行该脚本 ~] # chmod 750 /etc/rc.d/rc.local #Centos7,rc.local没有执行权限,要给予权限才能执行 ~] # sh /etc/rsync.sh & #执行同步脚本 |
七、测试
1、图文博客发布
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2、PURGE清空Varnish缓存测试 ~] # curl -X PURGE www.simpletime.net/ <!DOCTYPE html> <html> < head > <title>200 Purged< /title > < /head > <body> <h1>Error 200 Purged< /h1 > <p>Purged< /p > <h3>Guru Meditation:< /h3 > <p>XID: 100925448< /p > <hr> <p>Varnish cache server< /p > < /body > < /html > 3、压力测试 #存在缓存服务器,单机测试只做参考 ~] # ab -c 20000 -n 20000 -r www.simpletime.net/ Requests per second: 670.86 [ #/sec] (mean) Time per request: 29812.421 [ms] (mean) Time per request: 1.491 [ms] (mean, across all concurrent requests) ~] # ab -c 20000 -n 20000 -r www.simpletime.net/ Requests per second: 521.78 [ #/sec] (mean) Time per request: 38330.212 [ms] (mean) Time per request: 1.917 [ms] (mean, across all concurrent requests) ~] # ab -c 20000 -n 20000 -r www.simpletime.net/ Requests per second: 521.78 [ #/sec] (mean) Time per request: 38330.212 [ms] (mean) Time per request: 1.917 [ms] (mean, across all concurrent requests) 4、HAProxy调度器挂了,整个架构崩溃... 5、Varnish挂一台,没事,有冗余,高可用实现,另一台Varnish压力增大,尽快修复故障机器即可。 6、后端主机,理论上动静态群集组能冗余各组一台服务器故障,可因为NFS文件系统懒人配置,NFS客户端挂了没事,NFS服务端挂了,GameOver... 7、文件服务器NFS服务端挂了,(NFS服务器没有做冗余)GameOver... 8、Rsync+Inodify文件实时同步系统挂了,服务器还能访问,只是图片等流格式文件不显示了... 9、MysqlServer挂了,无冗余,(GameOver)... 10、后端应用服务器Nginx日志示例: ~] # tail /var/log/nginx/access.log 172.16.39.15(VarnishIP) - - [26 /Aug/2016 :17:09:56 +0800] "POST /wp-admin/admin-ajax.php HTTP/1.1" 200 32 "http://172.16.39.50/wp-admin/post-new.php" "Mozilla /5 .0 (Windows NT 6.1; WOW64) AppleWebKit /537 .36 (KHTML, like Gecko) Chrome /49 .0.2623.110 Safari /537 .36 " " 172.16.39.5(客户端IP), 172.16.39.50(HAProxyIP)" |
八、总结
1、架构优点:
(1)HAProxy为Varnish缓存服务器提供了高可用的负载均衡,其使用的算法,也为Varnish提升了缓存命中率;
(2)HAProxy提供Web图形化管理界面,节约了学习成本;
(3)Varnish的高效缓存机制极大的提升了Web应用的性能,降低了Web服务器的压力;
(4)Varnish给后端Web服务器提供了高可用负载均衡,并使用了动态分离技术,保障了后端主机的冗余,显著提升了其性能;
(5)NFS+Rsync+inodify基本解决了该架构存储的问题,该架构文件存储因服务器有限,并没有设计好,储存服务器因有单独的网络存储服务器来提供;
2、冗余不足:
(1)Nginx负载均衡调度器,没有冗余能力,易出现单点故障。
解决方案:增加服务器,使用Keepalive做高可用。
(2)MysqlServer,没有冗余能力。
解决方案:增加服务器,使用Keepalive做高可用。
(3)NFS文件服务,没有冗余能力。
解决方案:可以增加服务器,使用rsync+inodify实现数据实时同步,再用keepalive做高可用。
3、性能瓶颈:
(1)NFS文件系统,因网络IO能力与磁盘本身性能,多台主机同时挂载执行读取读写操作,势必带来性能下降,根据木桶原理,此短板已成为该群集方案性能瓶颈。
(2)在大量的读写访问下,数据库的压力会非常大,从而影响性能。
解决方案:a、主从复制,主要提供高可用冗余能力,对性能有所提升,对数据压力不算太大的企业可选方案;
b、高可用负载均衡,扩展性强,同时提供高可用及负载均衡,性能有极大提升;
4、会话保持
(1)会话保持机制因添加memcache服务器,使用其sesion功能;
友情链接:
1、Nginx日志过滤模块官网下载链接
https://github.com/cfsego/ngx_log_if/
2、Varnish4.0官方帮助指南
http://www.varnish-cache.org/docs/4.0/users-guide/
以上均为个人观点,本架构还有许多不足之处,仅作学习交流之用;