Nginx+keepalived负载均衡
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使用keeplive实现nginx的负载均衡,防止nginx形成单点。
nginx有很强代理功能,但是一台nginx就形成了单点,现在使用keepalived来解决这个问题,keepalived的故障转移时间很短,而且配置简单,这也是选择keepalived的一个主要原因,建议日PV值小的中小型企业web均可采用如下方案实行,下面直接上安装步骤:
一、环境:
centos4.8、nginx-0.7.62、keepalived-1.1.19
master:192.168.10.61
slave:192.168.10.62
slave:192.168.10.62
vip:192.168.10.60
二、安装nginx(master和slave安装步骤一样)
1.Tcmalloc 优化Nginx性能
64位操作系统请先安装libunwind库,32位操作系统不要安装。libunwind库为基于64位CPU和操作系统的程序提供了基本的堆栈辗转开解功能,其中包括用于输出堆栈跟踪的API、用于以编程方式辗转开解堆栈的API以及支持C++异常处理机制的API。
# tar zxvf libunwind-0.99-alpha.tar.gz# cd libunwind-0.99-alpha/# CFLAGS=-fPIC ./configure# make CFLAGS=-fPIC# make CFLAGS=-fPIC install
2、安装google-perftools:
# tar zxvf google-perftools-0.97.tar.gz# cd google-perftools-0.97/# ./configure# make && make install# echo "/usr/local/lib" > /etc/ld.so.conf.d/usr_local_lib.conf# /sbin/ldconfig# lsof -n|grep tcmalloc
在编译Nginx时添加参数--with-google_perftools_module
3.安装 pcre
#tar zxvf pcre-7.8.tar.gz#cd pcre-7.8#./configure#make && make install
4、安装nginx
# tar zxvf nginx-0.7.62.tar.gz# cd nginx-0.7.62# ./configure --with-http_stub_status_module --with-google_perftools_module --prefix=/usr/local/nginx# make && make install
启动 nginx
# /usr/local/nginx/sbin/nginx
然后我们用IE测试一下http://IP地址或域名 就可以看到nginx的默认的页面证明nginx已经启动
关闭 nginx# kill -QUIT `cat /usr/local/nginx/logs/nignx.pid`重启 nginx# kill -HUP `cat /usr/local/nginx/logs/nignx.pid`
三、安装keepalived
# tar zxvf keepalived-1.1.19.tar.gz# cd keepalived-1.1.19# ./configure --prefix=/usr/local/keepalived# make# make install# cp /usr/local/keepalived/sbin/keepalived /usr/sbin/# cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/# cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/# mkdir /etc/keepalived# cd /etc/keepalived/
# vi keepalived.conf
! Configuration File for keepalivedglobal_defs {notification_email {linjingmin2002@163.com}notification_email_fromadmin@yahunet.comsmtp_server 127.0.0.1smtp_connect_timeout 30router_id LVS_DEVEL}vrrp_instance VI_1 {state MASTERinterface eth0virtual_router_id 51mcast_src_ip 192.168.10.62 <==辅nginx的IP地址priority 100advert_int 1authentication {auth_type PASSauth_pass chtopnet}virtual_ipaddress {192.168.10.60 <==VIP地址}}
启动keepalived
# service keepalived start
通过命令看一下
# ip a1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueuelink/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 brd 127.255.255.255 scope host loinet6 ::1/128 scope hostvalid_lft forever preferred_lft forever2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000link/ether 00:0c:29:af:08:1d brd ff:ff:ff:ff:ff:ffinet 192.168.10.61/24 brd 192.168.10.255 scope global eth0inet 192.168.10.60/32 scope global eth0inet6 fe80::20c:29ff:feaf:81d/64 scope linkvalid_lft forever preferred_lft forever3: sit0: <NOARP> mtu 1480 qdisc nooplink/sit 0.0.0.0 brd 0.0.0.0
说明vip已经启动,这样主服务器就配置好了,辅机的配置大致一样,除了配置文件有少部分的变化,下面贴出辅机的配置文件:
! Configuration File for keepalivedglobal_defs {notification_email {linjingmin2002@163.com}notification_email_fromadmin@yahunet.comsmtp_server 127.0.0.1smtp_connect_timeout 30router_id LVS_DEVEL}vrrp_instance VI_1 {state BACKUPinterface eth0virtual_router_id 51mcast_src_ip 192.168.10.61 <==主nginx的IP的地址priority 100advert_int 1authentication {auth_type PASSauth_pass yahunet}virtual_ipaddress {192.168.10.60}}
# ip a1: lo: <LOOPBACK,UP> mtu 16436 qdisc noqueuelink/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8 brd 127.255.255.255 scope host loinet6 ::1/128 scope hostvalid_lft forever preferred_lft forever2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 1000link/ether 00:0c:29:3f:60:89 brd ff:ff:ff:ff:ff:ffinet 192.168.10.62/24 brd 192.168.10.255 scope global eth0inet 192.168.10.60/32 scope global eth0inet6 fe80::20c:29ff:fe3f:6089/64 scope linkvalid_lft forever preferred_lft forever3: sit0: <NOARP> mtu 1480 qdisc nooplink/sit 0.0.0.0 brd 0.0.0.0
四、测试
测试其效果方法很简单,分别在主辅机上建立不同的主页,index.html的内容分别为192.168.10.61,192.168.10.62,
然后用客户机上http://192.168.10.60,主机down掉后辅机会马上接替提供服务,主机恢复后会马上再接替回来。
然后用客户机上http://192.168.10.60,主机down掉后辅机会马上接替提供服务,主机恢复后会马上再接替回来。
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