现需设置 主机A 免密码登陆 主机B

主机A: 192.168.0.61 主机B: 192.168.0.62

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1、在主机A中生成公钥和私钥

cd /～/.ssh ssh-keygen -t rsa

主机A的提示如下，在要求输入密码（Enter passphrase）的提示中按回车即为空密码

Generating public/private rsa key pair. Enter file in which to save the key (/Users/Allen/.ssh/id_rsa): /Users/Allen/.ssh/id_rsa Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /Users/Allen/.ssh/id_rsa. Your public key has been saved in /Users/Allen/.ssh/id_rsa.pub. The key fingerprint is: SHA256:luC3egH9J9VEDYxToA8VS6oPlXT8jiViukOvmc/n2+I Allen@localhost The key's randomart image is: +---[RSA 2048]----+ | ..*B+o | | . B+.o .| | .. * .= | | ....+ooo + | | ..S+ o.= | | o++o o . | | ..+.o | | .++. o. | | ..++o+Eo. | +----[SHA256]-----+

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2、把主机A生成的公钥id_rsa.pub复制至主机B

scp id_rsa.pub root@192.168.0.62:/root/.ssh/id_rsa.pub

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3、在主机B上把主机A的公钥复制至authorized_keys

cat id_rsa.pub >>/root/.ssh/authorized_keys

完成上述步骤后，下次在主机A（192.168.0.61）上使用ssh root@192.168.0.62 登陆主机B（192.168.0.62）将不需要密码

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