Linux免密登录确实是指A服务器通过SSH协议登录B服务器时无需手动输入密码。其核心原理是通过非对称加密的密钥对实现身份验证:A服务器生成公钥和私钥后,将公钥部署到B服务器的授权文件中,后续登录时B服务器会用该公钥验证A服务器的私钥,从而跳过密码验证环节
js# 强制创建.ssh目录并设置权限
mkdir -p ~/.ssh
chmod 700 ~/.ssh
# 生成RSA密钥对(无密码)
ssh-keygen -t rsa -b 4096 -f ~/.ssh/id_rsa -N ""
# 设置密钥权限
chmod 600 ~/.ssh/id_rsa
chmod 644 ~/.ssh/id_rsa.pub
# 将公钥追加到authorized_keys
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys
js$ cat id_rsa.pub
ssh-rsa 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 jenkins@5ca614ac051b
jsvi ~/.ssh/authorized_keys
本文作者:松轩(^U^)
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