Passwordless auth task , where did I go wrong

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but for passwordless auth you have to follow following steps
ssh-keygen -t rsa
ssh [email protected] mkdir -p .ssh
cat /home/thor/.ssh/id_rsa.pub | ssh [email protected] ‘cat >> .ssh/authorized_keys’
ssh [email protected] “chmod 700 .ssh; chmod 640
.ssh/authorized_keys”
ssh [email protected]

Hello, @Olu
I think this task is to perform in the all app server ? is it?