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假设源主机需要对主机名为node1、node2、node3的目标节点在用户名test下进行无密码访问，则需要一次输入如下命令:
ssh-keygen ssh-copy-id test@node1 ssh-copy-id test@node2 ssh-copy-id test@node3 或者 ssh-keygen -t rsa ssh-copy-id test@node1 ssh-copy-id test@node2 ssh-copy-id test@node3 或者 ssh-keygen -t dsa ssh-copy-id test@node1 ssh-copy-id test@node2 ssh-copy-id test@node3
