CentOS配置keepalived

一、介绍

Keepalived提供了用于负载平衡和高可用性的框架。常见的架构模式有keepalived+lvs、keepalived+nginx、keepalived+mysql、keepalived+redis

二、分析

• 优点
  • 方案成熟，使用量多
  • 简单高效
• 缺点
  • 无法支持毫秒级别切换，最小支持秒级别切换

三、安装

[root@0f350e880a3e /]# yum install keepalived -y

四、配置示例

virtual_server 193.168.29.10 80 {
    delay_loop 6
    lb_algo rr
    lb_kind DR
    nat_mask 255.255.255.0
    persistence_timeout 50
    protocol TCP

    real_server 192.168.29.8 80 {
        weight 1
        TCP_CHECK {
            connect_timeout    8
            nb_get_retry    3
            delay_before_retry    3
            connect_port    80
    }
}
    real_server 192.168.29.5 80 {
        weight 1
        TCP_CHECK {
            connect_timeout    8
            nb_get_retry    3
            delay_before_retry    3
            connect_port    80
    }
}
}

备注：配置文件需根据实际情况处理，参考文档：https://www.keepalived.org/doc/configuration_synopsis.html