How to configure Hadoop stand-alone mode and run Wordcount

This article introduces the knowledge of "how to configure Hadoop stand-alone mode and run Wordcount". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

Install ssh

Hadoop uses ssh for communication. At this time, we need to set the password to be empty, that is, we do not need to log in the password, so that we do not have to enter the secret every time we communicate. Install it as follows:

Enter "Y" to install and wait for the automatic installation to complete.

Start the service after the ssh installation is complete

The following command verifies that the service starts normally:

You can see that ssh starts normally

Set password-free login to generate private key and public key:

Generate two files in / root/.ssh: id_rsa and id_rsa.pub,id_rsa are the private keys and id_rsa.pub is the public key, and we append the public key id_rsa.pub to authorized_keys because authorized_keys is used to hold all the public key contents that allow you to log in to the ssh client user as the current user:

See if you can log in to ssh without a password now.

Enter "yes" to continue logging in:

Indicates that we have successfully logged in

You can exit localhost using the following command

You don't need a password to log in to localhost again, as shown in the following figure:

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