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Sentinel (Sentinel) process is used to monitor the working status of Master master server in redis cluster. When Master master server fails, it can switch between Master and Slave servers to ensure high availability of the system. It has been integrated into redis2.6 + version, and Redis Sentinel mode has stabilized after version 2.8. In general, it is also recommended to use later versions of Redis version 2.8 in production environment. Sentinel is a distributed system. You can run multiple sentinel processes in one architecture. These processes use gossip protocols to receive information about whether the Master master server is offline, and use Agreement Protocols to decide whether to perform automatic failover and which Slave to select as the new Master. Each Sentinel process will send messages to other Sentinel, Master and Slave regularly to confirm whether the other party is "alive". If it is found that the other party has not received a response within the specified configuration time (configurable), it will temporarily think that the other party has dropped, which is called "Subjective Down". English name: Subjective Down, SDOWN for short. Subjective Down,5. Then use the built image to start a container and start the nginx service:四个女孩Duchess、Sundae、Mimi和ViewViva住在Jam夫人的公寓里，这栋公寓有一个严格的规定，那就是：不允许男孩进入这栋公寓，但是她们的爱情却都发生在这栋公寓里……《地下铁路》（Underground）描述了传说中的「地下铁路」（亦称地下逃亡线，Underground Railroad）——19世纪美国废奴主义者建立起一个把黑奴送到自由州、加拿大、墨西哥甚至海外的秘密网络，史称「地下铁路」。由于协助黑奴逃亡在当时是死罪，因此参与这个秘密网络的人和通过这个秘密网络逃亡的黑奴都面临巨大的危险。更糟的是，政府重金招募了一群穷凶极恶的雇佣兵来追捕「地下铁路」成员及那些逃走的黑奴。在该剧中，一群黑人奴隶决心从位于乔治亚州的种植园启程，沿着查塔胡奇河（Chattahoochee River）长途跋涉六百英里奔向北方的自由区。一对秘密支持废奴主义的夫妻在「地下铁路」中建立起一个中转站，与那些奉命捉拿逃跑奴隶的雇佣兵展开斗智斗勇的较量。那些雇佣兵并不在乎奴隶的死活，因此他们是非常可怕的对手。Han Han said