linux - Permission Denied error while ssh into datanode during setup of hadoop 1.2.1 multi-node cluster on centOS -

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i learning setup hadoop multi-node cluster on centos , not able ssh datanodes.

i have tried copying public key namenode datanodes using root user. when login using user other root , try ssh datanodes gives permission denied error.following copy of etc/host file

enter image description here

for cluster setup , working, hadoop needs able establish secure shell connections without passing passphrase.

main steps involved in setting password-less access configuration are:

step-1)

generate public private keys on namenode(s) , jobtracker/resourcemanager

ssh-keygen -t dsa -p '' -f ~/.ssh/id_dsa

step-2)

combine public keys these hosts , combine authorized_keys file.

step-3)

copy authorized_keys file in ~/.ssh/ on hosts in cluster.

scp authorized_keys user@192.168.1.100:~/.ssh/ scp authorized_keys user@192.168.1.101:~/.ssh/ scp authorized_keys user@192.168.1.102:~/.ssh/ . . scp authorized_keys user@192.168.1.xxx:~/.ssh/

here user example user , 192.168.1.100--xxx ips of servers in cluster.

now need these step (1-3) every user want ssh other hosts.

e.g if want ssh 192.168.1.100 testuser.

ssh testuser@192.168.1.100

then have step (1-3) testuser.


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