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amazon EMR集群节点之间可以配置SSH 免密吗？

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amazon EMR集群节点之间可以配置SSH 免密吗？

遇到两个问题：
1、ssh免密登陆
2、在task节点上不能创建目录，会不会是权限的问题？
新上手EMR。希望各位指点，非常感谢


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