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Merge pull request #2259 from qiuchudong/patch-1
Update set-up-ha-cluster-using-keepalived-haproxy.md
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## 配置负载均衡
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[Keepalived](https://www.keepalived.org/) 提供 VRPP 实现,并允许您配置 Linux 机器使负载均衡,预防单点故障。[HAProxy](http://www.haproxy.org/) 提供可靠、高性能的负载均衡,能与 Keepalived 完美配合。
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[Keepalived](https://www.keepalived.org/) 提供 VRRP 实现,并允许您配置 Linux 机器使负载均衡,预防单点故障。[HAProxy](http://www.haproxy.org/) 提供可靠、高性能的负载均衡,能与 Keepalived 完美配合。
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由于 `lb1` 和 `lb2` 上安装了 Keepalived 和 HAproxy,如果其中一个节点故障,虚拟 IP 地址(即浮动 IP 地址)将自动与另一个节点关联,使集群仍然可以正常运行,从而实现高可用。若有需要,也可以此为目的,添加更多安装 Keepalived 和 HAproxy 的节点。
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