October 2018
Beginner
220 pages
5h 33m
English
Content preview from Apache Hadoop 3 Quick Start Guide
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Working across nodes without passwords (SSH in keyless)
When Apache Hadoop is set up across multiple nodes, it often becomes evident that administrators and developers need to connect to different nodes to diagnose problems, run scripts, install software, and so on. Usually, these scripts are automated and are fired in a bulk manner. Similarly, master nodes often need to connect to slaves to start or stop the Hadoop processes using SSH. To allow the system to connect to a Hadoop node without any password prompt, it is important to make sure that all SSH access is keyless. Usually, this works in one direction, meaning system A can set up direct access to system B using a keyless SSH mechanism. Master nodes often hold data nodes or map-reduce ...
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