高集成：keepalived
负载均衡：nginx
1、服务器IP
Client: 172.25.254.25
Keepalived+Nginx1: 172.25.254.115 Vip: 172.25.254.100
Keepalived+Nginx2: 172.25.254.215 Vip: 172.25.254.100
二、安装
1、安装keepalived
yum install keepalived
2、编译安装Nginx
[root@node1 ~]#useradd -r nginx[root@node1 ~]#yum -y groupinstall "Development tools" "Server Platform Development"[root@node1 ~]#yum -y install pcre-devel[root@node1 ~]#tar xf nginx-1.4.2.tar.gz[root@node1 ~]#cd nginx-1.4.2[root@node1 nginx-1.4.2]# ./configure \--prefix=/usr\--sbin-path=/usr/sbin/nginx\--conf-path=/etc/nginx/nginx.conf \--error-log-path=/var/log/nginx/error.log \--http-log-path=/var/log/nginx/access.log \--pid-path=/var/run/nginx/nginx.pid \--lock-path=/var/lock/nginx.lock \--user=nginx \--group=nginx \--with-http_ssl_module \--with-http_flv_module \--with-http_stub_status_module \--with-http_gzip_static_module \--http-client-body-temp-path=/var/tmp/nginx/client/\--http-proxy-temp-path=/var/tmp/nginx/proxy/\--http-fastcgi-temp-path=/var/tmp/nginx/fcgi/\--http-uwsgi-temp-path=/var/tmp/nginx/uwsgi\--http-scgi-temp-path=/var/tmp/nginx/scgi\--with-pcre提示：在两台服务器上都要安装Nginx
[root@node1 nginx-1.4.2]# service nginx start
Starting nginx: [ OK ]三、实现高可用
1、修改配置keepalived
[root@node1 ~]# cd /etc/keepalived[root@node1 keepalived]# mv keepalived.conf keepalived.conf.bak [root@node1 keepalived]#vim keepalived.conf ! Configuration File forkeepalivedglobal_defs {notification_email {root@localhost}notification_email_from kaadmin@localhostsmtp_server 127.0.0.1smtp_connect_timeout 30router_id LVS_DEVEL}vrrp_script chk_nginx {script "killall -0 nginx"interval 1weight 2}vrrp_instance VI_10 {state MASTERinterface eth0virtual_router_id 131priority 100advert_int 1authentication {auth_type PASSauth_pass 123456}virtual_ipaddress {172.16.3.100}track_script {chk_nginx} |
| 3、验证 |
[root@node1 ~]# ip addr1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWNlink/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8scope host loinet6 ::1/128scope hostvalid_lft forever preferred_lft forever2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000link/ether00:0c:29:65:a0:2f brd ff:ff:ff:ff:ff:ffinet 172.16.3.3/16brd 172.16.255.255 scope global eth0inet 172.16.3.100/32scope global eth0 # Vip此时在Keepalived+Nginx1上inet6 fe80::20c:29ff:fe65:a02f/64scope linkvalid_lft forever preferred_lft forever |
然后关闭Keepalived+Nginx1上的keepalived服务Vip会跳转到Keepalived上
四、实现负载均衡
1、修改Keepalived配置文件
Keepalived+Nginx1：
[root@node1 ~]# cd /etc/keepalived[root@node1 keepalived]# mv keepalived.conf keepalived.conf.bak # 备份keepalived配置文件[root@node1 keepalived]#vim keepalived.conf # 创建配置文件，如下! Configuration File forkeepalivedglobal_defs {notification_email {root@localhost}notification_email_from kaadmin@localhostsmtp_server 127.0.0.1smtp_connect_timeout 30router_id LVS_DEVEL}vrrp_script chk_nginx {script "killall -0 nginx"interval 1weight 2}vrrp_instance VI_10 {state MASTERinterface eth0virtual_router_id 131priority 100advert_int 1authentication {auth_type PASSauth_pass 123456}virtual_ipaddress {172.16.3.100}track_script {chk_nginx}vrrp_instance VI_20 {state BACKUPinterface eth0virtual_router_id 132priority 99advert_int 1authentication {auth_type PASSauth_pass 123456}virtual_ipaddress {172.16.3.200}track_script {chk_nginx }} |
Keepalived+Nginx2 同理
[root@node2 ~]# cd /etc/keeplived[root@node2 keepalived]# mv keepalived.conf keepalived.conf.bak[root@node2 keepalived]# vim keepalived.conf! Configuration File forkeepalivedglobal_defs {notification_email {root@localhost}notification_email_from kaadmin@localhostsmtp_server 127.0.0.1smtp_connect_timeout 30router_id LVS_DEVEL}vrrp_script chk_nginx {script "killall -0 nginx"interval 1weight 2}vrrp_instance VI_10 {state BACKUPinterface eth0virtual_router_id 131priority 99advert_int 1authentication {auth_type PASSauth_pass 123456}virtual_ipaddress {172.16.3.100}track_script {chk_nginx}}vrrp_instance VI_20 {state MASTERinterface eth0virtual_router_id 132priority 100advert_int 1authentication {auth_type PASSauth_pass 123456}virtual_ipaddress {172.16.3.200}track_script {chk_nginx}
2、重启Keepalived服务 |
[root@node1 ~]# service keepalived restart[root@node2 ~]# service keepalived restart |
3、验证
[root@node2 ~]# ip addr show1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWNlink/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8scope host loinet6 ::1/128scope hostvalid_lft forever preferred_lft forever2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000link/ether00:0c:29:52:ee:44 brd ff:ff:ff:ff:ff:ffinet 172.16.3.4/16brd 172.16.255.255 scope global eth0inet 172.16.3.200/32scope global eth0 #此时vip2在Keepalived+Nginx2上inet6 fe80::20c:29ff:fe52:ee44/64scope linkvalid_lft forever preferred_lft forever |
4、关闭Keepalived+Nginx2上的Keepalived服务模拟故障，vip2会转移到Keepalived+Nginx1上，反之依然
[root@node1 ~]# ip addr show1: lo: <LOOPBACK,UP,LOWER_UP> mtu 16436 qdisc noqueue state UNKNOWNlink/loopback00:00:00:00:00:00 brd 00:00:00:00:00:00inet 127.0.0.1/8scope host loinet6 ::1/128scope hostvalid_lft forever preferred_lft forever2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UNKNOWN qlen 1000link/ether00:0c:29:65:a0:2f brd ff:ff:ff:ff:ff:ffinet 172.16.3.3/16brd 172.16.255.255 scope global eth0inet 172.16.3.100/32scope global eth0inet 172.16.3.200/32scope global eth0inet6 fe80::20c:29ff:fe65:a02f/64scope linkvalid_lft forever preferred_lft forever |
原文：http://ybzbfs.blog.51cto.com/12765816/1952129