1）拓扑描述：
2) Nginx的安装准备
#yum-yinstallpcrepcre-devel #yum-yinstallopenssl* #mkdir-p/application/Nginx1.6.2 #ln-s/application/Nginx1.6.2/application/Nginx
3) 安装Nginx
#cd/usr/local/src #tarxfNginx-1.6.2.tar.gz #cdNginx-1.6.2 #useraddNginx-s/sbin/nologin-M #./configure--user=Nginx--group=Nginx--prefix=/application/Nginx1.6.2--with-http_stub_status_module--with-http_ssl_module #echo$? 0 #make&&makeinstall
4) 启动Nginx
检查语法： #/application/Nginx1.6.2/sbin/Nginx-t Nginx:theconfigurationfile/application/Nginx1.6.2/conf/Nginx.confSyntaxisok Nginx:configurationfile/application/Nginx1.6.2/conf/Nginx.conftestissuccessful 启动Nginx： #/application/Nginx/sbin/Nginx 查看端口号： #lsof-i:80 COMMANDPIDUSERFDTYPEDEVICESIZE/OFFNODENAME Nginx14603root6uIPv4293970t0TCP*:http(LISTEN) Nginx14604Nginx6uIPv4293970t0TCP*:http(LISTEN) #netstat-tunlp|grepNginx tcp000.0.0.0:800.0.0.0:*LISTEN14603/Nginx 测试网页页面： #curl-Ilocalhost HTTP/1.1200OK Server:Nginx/1.6.2 Date:Tue,20Sep201602:17:20GMT Content-Type:text/html Content-Length:612 Last-Modified:Tue,20Sep201602:11:05GMT Connection:keep-alive ETag:"57e09ab9-264" Accept-Ranges:bytes
5）配置Nginx启动脚本
#vim/etc/init.d/Nginx #!/bin/sh #chkconfig:23458515 #description:NginxServer #Nginx的安装目录 Nginx_HOME=/application/Nginx #Nginx的命令 Nginx_SBIN=$Nginx_HOME/sbin/Nginx #Nginx的配置文件 Nginx_CONF=$Nginx_HOME/conf/Nginx.conf #Nginx的pid Nginx_PID=$Nginx_HOME/logs/Nginx.pid Nginx_NAME="Nginx" ./etc/rc.d/init.d/functions if[!-f$Nginx_SBIN] then echo"$Nginx_NAMEstartup:$Nginx_SBINnotexists!" exit fi start(){ $Nginx_SBIN-c$Nginx_CONF ret=$? if[$ret-eq0];then action$"Starting$Nginx_NAME:"/bin/true else action$"Starting$Nginx_NAME:"/bin/false fi } stop(){ kill`cat$Nginx_PID` ret=$? if[$ret-eq0];then action$"Stopping$Nginx_NAME:"/bin/true else action$"Stopping$Nginx_NAME:"/bin/false fi } restart(){ stop start } check(){ $Nginx_SBIN-c$Nginx_CONF-t } reload(){ kill-HUP`cat$Nginx_PID`&&echo"reloadsuccess!" } relog(){ kill-USR1`cat$Nginx_PID`&&echo"relogsuccess!" } case"$1"in start) start ;; stop) stop ;; restart) restart ;; check|chk) check ;; status) status-p$Nginx_PID ;; reload) reload ;; relog) relog ;; *) echo$"Usage:$0{start|stop|restart|reload|status|check|relog}" exit1 esac #chmod+x/etc/init.d/Nginx #/etc/init.d/Nginxstart #chkconfig--addNginx #chkconfigNginxon
6) 配置Nginx的upstream功能（两台负载均衡器上做相同的配置）
#egrep-v'#'/application/Nginx/conf/Nginx.conf|grep-v'^$' worker_processes1; events{ worker_connections1024; } http{ includemime.types; default_typeapplication/octet-stream; includeextra/upstream01.conf; sendfileon; keepalive_timeout65; server{ listen80; server_namelocalhost; location/{ roothtml; indexindex.htmlindex.htm; } error_page500502503504/50x.html; location=/50x.html{ roothtml; } } } 说明：注意includeextra/upstream01.conf这个文件，是引用此文件(两台负载均衡器上做系统的Nginx配置) #mkdir-p/application/Nginx/conf/extra/ #vim/application/Nginx/conf/extra/upstream01.conf upstreamNginx.wanwan.com{ server10.10.10.128:80weight=5; server10.10.10.132:80weight=5; } server{ listen80; server_nameNginx.wanwan.com; location/{ proxy_passhttp://Nginx.wanwan.com; } } #/etc/init.d/Nginxrestart StoppingNginx:[确定] StartingNginx:[确定]
7）keepalived的安装
#cd/usr/local/src #wgethttp://www.keepalived.org/software/keepalived-1.1.19.tar.gz #ln-s/usr/src/kernels/2.6.32-573.el6.x86_64//usr/src/linux #ls-l/usr/src 总用量244 drwxr-xr-x.2rootroot40969月232011debug -rw-r--r--1rootroot2414371月282014keepalived-1.1.19.tar.gz drwxr-xr-x.3rootroot40967月523:49kernels lrwxrwxrwx1rootroot398月3108:49linux->/usr/src/kernels/2.6.32-573.el6.x86_64/ #tarxfkeepalived-1.1.19.tar.gz #cdkeepalived-1.1.19 #./configure #make&&makeinstall #cp/usr/local/etc/rc.d/init.d/keepalived/etc/init.d/ #cp/usr/local/etc/sysconfig/keepalived/etc/sysconfig/ #mkdir-p/etc/keepalived #cp/usr/local/etc/keepalived/keepalived.conf/etc/keepalived/ #cp/usr/local/sbin/keepalived/usr/sbin/ #/etc/init.d/keepalivedstart 正在启动keepalived：[确定] #ps-ef|grepkeepalived root187501022:55?00:00:00keepalived-D root1875218750022:55?00:00:00keepalived-D root1875318750022:55?00:00:00keepalived-D root1875518664022:55pts/000:00:00grepkeepalived keepalived-master的配置文件/etc/keepalived/keepalived.conf [root@Nginx01extra]#cat/etc/keepalived/keepalived.conf !ConfigurationFileforkeepalived global_defs{ notification_email{ 314324506@qq.com } notification_email_fromAlexandre.Cassen@firewall.loc smtp_serversmtp.qq.com smtp_connect_timeout30 router_idNginx_7 } vrrp_instanceVI_231{ stateMASTER interfaceeth0 virtual_router_id231 priority150 advert_int1 authentication{ auth_typePASS auth_pass1111 } virtual_ipaddress{ 10.10.10.231/24 } } } keepalived-slave的配置文件/etc/keepalived/keepalived.conf [root@Nginx02~]#cat/etc/keepalived/keepalived.conf !ConfigurationFileforkeepalived global_defs{ notification_email{ 314324506@qq.com } notification_email_fromAlexandre.Cassen@firewall.loc smtp_serversmtp.qq.com smtp_connect_timeout30 router_idNginx_7 } vrrp_instanceVI_231{ stateBACKUP interfaceeth0 virtual_router_id231 priority100 advert_int1 authentication{ auth_typePASS auth_pass1111 } virtual_ipaddress{ 10.10.10.231/24 } } }
8) 测试keepalived的功能（VIP为10.10.10.231)
[root@Nginx01extra]#ipaddlist 1:lo:<LOOPBACK,UP,LOWER_UP>mtu65536qdiscnoqueuestateUNKNOWN link/loopback00:00:00:00:00:00brd00:00:00:00:00:00 inet127.0.0.1/8scopehostlo inet6::1/128scopehost valid_lftforeverpreferred_lftforever 2:eth0:<BROADCAST,MULTICAST,LOWER_UP>mtu1500qdiscpfifo_faststateUPqlen1000 link/ether00:0c:29:d7:3e:f8brdff:ff:ff:ff:ff:ff inet10.10.10.131/24brd10.10.10.255scopeglobaleth0 inet10.10.10.231/24scopeglobalsecondaryeth0 inet6fe80::20c:29ff:fed7:3ef8/64scopelink valid_lftforeverpreferred_lftforever [root@Nginx02~]#ipaddlist 1:lo:<LOOPBACK,LOWER_UP>mtu1500qdiscpfifo_faststateUPqlen1000 link/ether00:0c:29:71:33:ebbrdff:ff:ff:ff:ff:ff inet10.10.10.135/24brd10.10.10.255scopeglobaleth0 inet6fe80::20c:29ff:fe71:33eb/64scopelink valid_lftforeverpreferred_lftforever 关闭主负载均衡上的keepalived功能 [root@Nginx01extra]#/etc/init.d/keepalivedstop 停止keepalived：[确定] [root@Nginx01extra]#ipaddlist 1:lo:<LOOPBACK,LOWER_UP>mtu1500qdiscpfifo_faststateUPqlen1000 link/ether00:0c:29:d7:3e:f8brdff:ff:ff:ff:ff:ff inet10.10.10.131/24brd10.10.10.255scopeglobaleth0 inet6fe80::20c:29ff:fed7:3ef8/64scopelink valid_lftforeverpreferred_lftforever [root@Nginx02~]#ipaddlist 1:lo:<LOOPBACK,LOWER_UP>mtu1500qdiscpfifo_faststateUPqlen1000 link/ether00:0c:29:71:33:ebbrdff:ff:ff:ff:ff:ff inet10.10.10.135/24brd10.10.10.255scopeglobaleth0 inet10.10.10.231/24scopeglobalsecondaryeth0 inet6fe80::20c:29ff:fe71:33eb/64scopelink valid_lftforeverpreferred_lftforever 由上，我们可以知道vip很快就进行了切换，那么我们恢复主负载均衡器上的keepalived功能： [root@Nginx01extra]#/etc/init.d/keepalivedstart 正在启动keepalived：[确定] [root@Nginx01extra]#ipaddlist 1:lo:<LOOPBACK,LOWER_UP>mtu1500qdiscpfifo_faststateUPqlen1000 link/ether00:0c:29:71:33:ebbrdff:ff:ff:ff:ff:ff inet10.10.10.135/24brd10.10.10.255scopeglobaleth0 inet6fe80::20c:29ff:fe71:33eb/64scopelink valid_lftforeverpreferred_lftforever 由上，我们发现当主负载均衡器恢复后，vip很快就切换过来了（因为主负载均衡器上的优先级更高）
[root@web01~]#curl10.10.10.128 MysqLsuccessfulbyoldboy! [root@web01~]#curl10.10.10.132 thisisweb02'swebsite
然后我们在客户端打开Nginx.wanwan.com
按F5刷新：
[root@Nginx01extra]#/etc/init.d/Nginxstop StoppingNginx:[确定] [root@Nginx01extra]#ipaddlist 1:lo:<LOOPBACK,LOWER_UP>mtu1500qdiscpfifo_faststateUPqlen1000 link/ether00:0c:29:d7:3e:f8brdff:ff:ff:ff:ff:ff inet10.10.10.131/24brd10.10.10.255scopeglobaleth0 inet10.10.10.231/24scopeglobalsecondaryeth0 inet6fe80::20c:29ff:fed7:3ef8/64scopelink valid_lftforeverpreferred_lftforever [root@Nginx01extra]#/etc/init.d/keepalivedstop 停止keepalived：
由上可知，后端网页仍旧正常。
10）注意事项
原文链接：https://www.f2er.com/centos/380067.html