centos配置SSH互信

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 root@192.168.1.1:/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