Hadoop Password-free login (SSH)

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[email protected]. ssh]# ssh-keygen-t rsa-p "
Generating public/private RSA key pair.
Enter file in which to save the key (/ROOT/.SSH/ID_RSA): Id_rsa
Your identification have been saved in Id_rsa.
Your public key had been saved in Id_rsa.pub.
The key fingerprint is:
5c:9a:67:12:49:6d:2d:ce:7e:da:fc:e3:ff:df:e5:58 [email protected]
[email protected]. ssh]# ls
backup Id_rsa id_rsa.pub known_hosts
[email protected]. ssh]# CP id_rsa.pub Authorized_keys
[email protected]. ssh]# ls
Authorized_keys Backup Id_rsa id_rsa.pub known_hosts
[email protected]. ssh]# start-all.sh
Starting Namenode, logging to/usr/local/hadoop/libexec/. /logs/hadoop-root-namenode-hadoop.out
Localhost:starting Datanode, logging to/usr/local/hadoop/libexec/. /logs/hadoop-root-datanode-hadoop.out
Localhost:starting Secondarynamenode, logging to/usr/local/hadoop/libexec/. /logs/hadoop-root-secondarynamenode-hadoop.out
Starting Jobtracker, logging to/usr/local/hadoop/libexec/. /logs/hadoop-root-jobtracker-hadoop.out
Localhost:starting Tasktracker, logging to/usr/local/hadoop/libexec/. /logs/hadoop-root-tasktracker-hadoop.out
[email protected]. ssh]#

Hadoop Password-free login (SSH)