"Hadoop Distributed Deployment Four: Configure the primary node (NN and RM) in Hadoop 2.x to SSH without password logins from the node"

Make sure that the three machines have the same user name and install the same directory *************

SSH Non-key login simple introduction (before building a local pseudo-distributed, it is generated, now the three machines of the public key private key is the same, so the following is not configured)

Stand-alone operation:

Generate Key: Command ssh-keygen-t RSA then four carriage return

Copy the key to native: command Ssh-copy-id hadoop-senior.zuoyan.com

　　

Start of formal operation

Actions on the host hadoop-senior.zuoyan.com:

Ssh-copy-id hadoop-senior03.zuoyan.com

Ssh-copy-id hadoop-senior02.zuoyan.com

(Test for example I want to log on from node one to node two using the command: SSH hadoop-senior02.zuoyan.com

Replicate the configured Hadoop to node two

Using the command: scp-r./hadoop-2.5.0/[Email protected]:/opt/app/(current directory:/opt/app)

　　　　　　　　

Then go to node two and discover that Hadoop is already in this directory

And then copy Hadoop 2.5 on node one up to node three.

Use command: scp-r./hadoop-2.5.0/[Email protected]:/opt/app/

And then go to the top of the node and look at the effect, and you'll find the file has been copied.

　　　　　　　　　　

On the second machine.

Go to the. SSH directory to delete the previously generated Id_rsa otherwise the problem is using the command RM-RF./id_rsa*

　　　　　　　　　　　　

The above deletion may still cause problems, the best solution is to remove all, and then re-copy the public key from node one

Use the command in the. SSH directory: RM-RF./*

　　　　　　　　　　　　

Switch to node one up, re-copy the public key to node two

　　　　　　　　　　　　　　

Then node three should also delete the public and private keys that are generated under. SSH, and then node one re-generates no key to log on to node three up

On node three, enter the. SSH directory and execute the command RM-RF./*

Then execute the down command on node one

　　　　　　　　　　　　　　　　

　　　　　　　　　　　　　　　　

　　　　　　　　　　

Next, configure the remaining two non-key logins on node two

Use command: ssh-keygen-t RSA

　　　　　　　　　　　　　　

Then execute Ssh-copy-id hadoop-senior02.zuoyan.com

　　　　　　　　　　　　　　　　

And then copy the public key to node one and node three.

　　　　　　　　　　　　　　　　

Then use SSH login to test it and successfully

　　　　　　　　　　　　　　　　

So far all the prep environments have been configured and ready to start.

"Hadoop Distributed Deployment Four: Configure the primary node (NN and RM) in Hadoop 2.x to SSH without password logins from the node"