1. 在本地主机创建密钥对

ssh-keygen -t rsa -C "xxx@xmail.com"

生成的密钥默认在本地主目录的.ssh目录中

2.在centos主机的用户目录下创建.ssh/authorized_keys文件

mkdir /home/username/.ssh

touch /home/username/.ssh/authorized_keys

3.确保.ssh目录的权限为700

chmod 700 /home/username/.ssh

4.确保authorized_keys的权限是600

chmod 600 /home/username/.ssh/authorized_keys

5.将公钥内容追加到authorized_keys文件中

echo "ssh-...公钥字符串" >> /home/username/.ssh/authorized_keys