add install pg_auto_failover with psql 11 in ubuntu 18.04
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@@ -27,6 +27,10 @@ https://github.com/citusdata/pg_auto_failover
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基本的邏輯是 一台 monitor , 一台 master/primary node ,一台 slave/secondary node 組成一個cluster
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官方提供的架構圖如下
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當master/primary node 上面的 postgresql 服務死掉了,slave/secondary node 會自動接手
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等到master/primary node 回來之後,會自動降級為 slave/secondary node
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