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In the last article, we explained Redis' master-slave cluster mode in detail. In fact, the configuration of this cluster mode is very simple. It only needs to be configured on Slave's nodes. The configuration of Master's master node does not need to be changed. However, one thing is that the persistent configuration of Master and Slave nodes should be consistent as far as possible, otherwise there will be strange problems. Starting today, we will begin to talk about the second mode of Redis cluster mode. That is, the "Sentinel" mode, which was provided from version 2.6 of Redis, but the mode of this version was unstable at that time. The Sentinel mode did not stabilize until version 2.8 of Redis. In the production environment, if you want to use the Sentinel mode of Redis, you will try to use the version after version 2.8 of Redis. Whether it is master-slave mode or sentinel mode, both modes have a problem and cannot be expanded horizontally, and the high availability of these two modes will be limited by the memory of Master master node. Another point is that the configuration of Sentinel mode is not simple or even complicated, so neither mode is recommended in industrial scenes. If you want to use it, you must have solutions to related problems to avoid subsequent problems.跟着补了一句，我叫香儿。这是一个武功绝伦的女刺客，最后，却无法杀人的故事。中国的唐代，女刺客聂隐娘是将门之女，十岁那年被师父带走训练成顶尖杀手，专门刺杀残暴的藩镇节度使，在一次刺杀任务失败后，师父将她送回故乡，这次，她要行刺的目标是北方最强大的藩镇节度使，她的表兄——田季安，也是她幼年时候的恋人。Techut是一名特工上校，他得伪装成间谍进行工作。Awassaya是个时尚名人，由于误会一直想要揭露他的真面目。Techut想要阻止恼怒的女孩毁掉自己的任务，但当Awassaya意识到他就是那个“对的人”后，她依旧继续打扰着他。当爱情意外降临时，他要怎么做呢？在他救了她许多次以后，她还能否认自己对他的感觉吗？一个即将毕业的大学生，她深信自己会成为一个伟大的诗人，而并不是每天在成人书店工作...Today's social environmental problems are becoming more and more serious, and the awareness of environmental protection is gradually fading in people's minds. In addition to the destruction of our actual actions, the environmental problems of the whole earth cannot be ignored. If we love our earth and our home, let us give a little strength to smile. Therefore, we designed this activity.I nodded and motioned for him to talk about the battle. Zhang Xiaobo coughed lightly, cleared his throat and began to say: