目录
Keepalived
Keepalived软件起初是专为LVS负载均衡软件设计的，用来管理并监控LVS集群系统中各个服务器节点的状态，后来又加入了实现高可用的VRRP功能。因此 Keepalived 除了能够管理LVS软件外，还可以作为其他服务（例如：NGINX、Haproxy、MySQL等）的高可用解决方案。 Keepalived软件主要是通过 VRRP 协议实现高可用功能的
Keepalived 服务的三个重要功能：
- 管理LVS负载均衡软件
- 实现LVS集群节点的健康检查中
- 作为系统网络服务的高可用性（failover）
配置文件： /etc/keepalived/keepalived.conf
完整的 keepalived 配置文件由3部分组成：
- 全局定义部分 global_defs vrrp
- 实例定义部分 vrrp_instance VI_1
- 虚拟服务器定义部分 virtual_server
Keepalived实现主备网站
某学校计划搭建一个校内论坛网站，为了保证并发量的需求，决定使用两台NGINX服务器提供WEB服务，通过Keepalived实现两台WEB服务器的负载均衡和高可用。
我们这里只配置keepalived部分的配置
Server1(Master)
- 安装keepalived： yum -y install keepalived
- 修改配置文件 /etc/keepalived/keepalived.conf
- 启动keepalived：systemctl start keepalived
global_defs {
notification_email {
[email protected]
[email protected]
[email protected]
}
notification_email_from [email protected]
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER ######
interface eno16777736 #######
virtual_router_id 51 #########master=backup
priority 150 #########master>backup
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress { ##对外的虚拟ip
192.168.10.100 #############master=backup
}
}Server2(Backup)：
- 安装keepalived： yum -y install keepalived
- 修改配置文件 /etc/keepalived/keepalived.conf
- 启动keepalived：systemctl start keepalived
global_defs {
notification_email {
[email protected]
[email protected]
[email protected]
}
notification_email_from [email protected]
smtp_server 192.168.200.1
smtp_connect_timeout 30
router_id LVS_DEVEL
}
vrrp_instance VI_1 {
state MASTER ######
interface eno16777736 #######
virtual_router_id 51 #########master=backup
priority 100 #########master>backup
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress { ##对外的虚拟ip
192.168.10.100 #############master=backup
}
}