红帽全球峰会14.4. 配置 VRRP 抢占
当一个节点上的虚拟 IP（VIP）因为通过了检查脚本的检查而脱离 fault 状态时，如果其优先级低于当前处于 master 状态的节点上的 VIP，则节点上的 VIP 将进入 backup 状态。nopreempt 策略不会将 master 从主机上的较低优先级 VIP 移到主机上的优先级更高的 VIP。当使用默认的 preempt_delay 300 时，Keepalived 会等待指定的 300 秒，并将 master 移到主机上的优先级更高的 VIP。
流程
要指定抢占，输入
oc edit deploy ipfailover-keepalived以编辑路由器部署配置：oc edit deploy ipfailover-keepalived
$ oc edit deploy ipfailover-keepalivedCopy to Clipboard Copied! Toggle word wrap Toggle overflow Copy to Clipboard Copied! Toggle word wrap Toggle overflow - 1
- 设置
OPENSHIFT_HA_PREEMPTION值：-
preempt_delay 300：Keepalived 会等待指定的 300 秒，并将master移到主机上的优先级更高的 VIP。这是默认值。 -
nopreempt：不会将master从主机上的较低优先级 VIP 移到主机上的优先级更高的 VIP。
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