A机器免密ssh到B机器：
方式1：
A 数据库服务器：拨号vps vim /etc/ssh/sshd_config PermitRootLogin yes RSAAuthentication yes PubkeyAuthentication yes systemctl restart sshd.service systemctl status sshd.service systemctl enable sshd.service ssh-keygen -t rsa scp /root/.ssh/id_rsa.pub [email protected]:/root/id_rsa.pub password: B备份机器: vim /etc/ssh/sshd_config PermitRootLogin yes RSAAuthentication yes PubkeyAuthentication yes mkdir .ssh cd .ssh mkdir authorzied_keys cat id_rsa.pub >> .ssh/authorized_keys chmod 600 .ssh/authorized_keys
A机器免密ssh到B机器：
方式2：
A/B服务器设置： vim /etc/ssh/sshd_config PermitRootLogin yes RSAAuthentication yes PubkeyAuthentication yes 1 ssh-keygen -t rsa 2 ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.1.1