Nginx + Keepalived 双机热备

基于Nginx和Keepalived双机热备

Keepalived 实现双机热备，消除一台机器单点故障的发生。准备2台机器ip地址分别为192.168.163.34、192.168.163.35。同时这2台机器都设置同一虚拟ip，
这里虚拟ip设置为192.168.163.100。2台机器都需要装上nginx和keepalived。

设置虚拟ip

这里要用到虚拟ip，虚拟ip的设置参考。

安装nginx 并启动

nginx安装

192.168.163.34启动

192.168.163.35启动

安装Keepalived

tar –zxvf keepalived-1.2.19.tar.gz
cd keepalived-1.2.19
./configure --prefix=/usr/local/keepalived
make
make install

keepalived.conf配置(192.168.163.34)

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVELA #MASTER节点
}

vrrp_instance VI_1 {
    state MASTER
    interface eth1
    virtual_router_id 51 #主、备必须一样  
    priority 100 #优先级
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.163.100 #VRRP HA虚拟地址
    }
}

keepalived.conf配置(192.168.163.35)

! Configuration File for keepalived

global_defs {
   notification_email {
     acassen@firewall.loc
     failover@firewall.loc
     sysadmin@firewall.loc
   }
   notification_email_from Alexandre.Cassen@firewall.loc
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVELB #BACKUP节点
}

vrrp_instance VI_1 {
    state BACKUP
    interface eth1
    virtual_router_id 51 #主、备必须一样  
    priority 99#优先级
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        192.168.163.100 #VRRP HA虚拟地址
    }
}

建立软链接并启动keepalived

ln -s /usr/local/keepalived/sbin/keepalived /sbin/
ln -s /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
ln -s /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
keepalived -D -f /usr/local/keepalived/etc/keepalived/keepalived.conf

测试

测试可见，浏览器中我们通过虚拟ip来访问，如上面所设置的会访问到master 34的机器。34这台机器的优先级高于35。

停用master机器

master机器停用(宕机、nginx死机等)会看到自动切换到35 backup那台机器。即192.168.163.34那台机器访问不了。

参考

nginx-ha-keepalived
keepalived