Hi all! i tried all method to do sincronize my servers through SSH, but always ask for password. I make 2 servers for test purposes, in cluster mode with centos 5.6 x86_64, and i eliminate glusterfs, because need high bandwidth, and i want to transfer files between servers with unison. i explain here my method: on ns2.mydomain.tld cmd : mkdir /root/.ssh cmd : ssh-keygen -t dsa -b 1024 -f /root/.ssh/ns2-key here a left it blank, just i pressed enter key cmd : scp /root/.ssh/ns2-key.pub email@example.com:/root/ here ask me yes / no i choose = yes also ask for root password, i typed from ns1.mydomain.tld mkdir /root/.ssh chmod 700 /root/.ssh mv /root/ns2-key.pub /root/.ssh/ cd /root/.ssh touch authorized_keys chmod 600 authorized_keys cat ns2-key.pub>>authorized_keys Now i go back to ns2.mydomain.tld to check if can in without password cmd: ssh firstname.lastname@example.org ask for password here. Should don't ask for password. Where i am wrong?