keepalive的原理
时间: 2023-09-04 13:14:22 浏览: 43
Keepalived是一种用于实现高可用性的软件,其原理是基于VRRP(Virtual Router Redundancy Protocol)进行通信和资源切换。VRRP通过竞选机制来确定主备节点,主节点的优先级高于备节点。在正常情况下,主节点会周期性地向备节点发送心跳消息,以告知备节点自己还活着。当主节点发生故障时,无法发送心跳消息,备节点会检测到主节点的故障并启动资源接管程序,接管主节点的 IP 资源和服务。当主节点恢复时,备节点会释放接管的资源,恢复到备用角色。这样可以保证服务的连续性,切换速度可以达到小于1秒。<span class="em">1</span><span class="em">2</span><span class="em">3</span>
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