Setup Passwordless login through SSH

Server 1 == IP 192.16.0.1    Application

Server 2 == IP 192.16.0.2    Backup

Step 1: Create SSH keys in both servers

Server1: 192.16.0.1:

# cd /root/.ssh

# rm -rf /root/.ssh/*

# ssh-keygen

Server 2: 192.16.0.2:

# cd /root/.ssh

# rm -rf /root/.ssh/*

# ssh-keygen

Step 2: Copy the public keys to other server

Server 1: 192.16.0.1:

# scp /root/.ssh/id_rsa.pub root@192.16.0.2:/root/.ssh/authorized_keys

Server 2: 192.16.0.2: 

# scp /root/.ssh/id_rsa.pub root@192.16.0.1:/root/.ssh/authorized_keys

Step 3: Restart SSH service in both servers

Server 1: 192.16.0.1

# service sshd restart

Server 2: 192.16.0.2

# service sshd restart

Step 4: Now check login without password

Server 1: 192.16.0.1

# ssh 192.16.0.2      => check whether logging in without password

Server 2: 192.16.0.2

# ssh 192.16.0.1      => check whether logging in without password