hadoop搭建之ssh：connect to host XXXX port 22：Connection timed out！【问题】
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ssh：connect to host XXXX port 22：Connection timed out！
对于本问题的解决需要检查下面的配置：1， 防火墙问题 【详细请点击这里】2， 检查节点的配置的映射关系是否出错了【是否和预期的设置相同】3 ，ifconfig 检查节点的ip 是否发生了改变！4， 还有 就是hadoop中的配置文件Slaves的信息（是否设置了）。
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