利用ssh-copy-id实现SSH无密码登录
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第一步: 产生公钥与私钥对:
[[email protected]]# ssh-keygen -t rsa
按照提示输入完后,会在~/.ssh目录下生成id_rsa和id_rsa.pub这两个文件
第二步:用ssh-copy-id将公钥复制到远程机器中
ssh-copy-id 将本机的公钥复制到远程机器的authorized_keys文件中,ssh-copy-id也会给远程主机的用户主目录(home)和 ~./ssh 和 ~/.ssh/authorized_keys设置合适的权利。
语法:
ssh-copy-id [-i [identity_file]] [[email protected]]machine
选项:
-i:指定公钥文件
实例:
把本地的ssh公钥文件安装到远程主机对应的账户下:
[[email protected]]# ssh-copy-id -i ~/.ssh/id_rsa.pub remote-host [email protected]‘s password: #输入远程主机的用户密码 Now try logging into the machine, with "ssh ‘remote-host‘", and check in: .ssh/authorized_keys to make sure we haven‘t added extra keys that you weren‘t expecting.
第三步: 登录到远程机器不用输入密码
[[email protected]]# ssh remote-host Last login: Mon Sep 11 18:30:00 2017 from remote-host
常见问题:
[[email protected]]# ssh-copy-id -u demo -i ~demo/.ssh/id_rsa.pub [email protected]_host /usr/bin/ssh-copy-id: ERROR: No identities found
上述是给demo用户赋予无密码登陆的权利
使用选项 -i ,当没有值传递的时候或者 如果 ~/.ssh/identity.pub 文件不可访问(不存在), ssh-copy-id 将显示上述的错误信息 ( -i选项会优先使用将ssh-add -L的内容)
[[email protected]]# ssh-agent $SHELL [[email protected]]# ssh-add -L The agent has no identities. [[email protected]]# ssh-add Identity added: /home/demo/.ssh/id_rsa (/home/demo/.ssh/id_rsa) [[email protected]]# ssh-add -L ssh-rsa AAAAB3NUaC1TR2SJKAABIwAAAQEAsJIEILuftj8aSxMa3k8t6JvM79DpBV aHreqPShTYp7kISDMUNzUpnyxsHpH1tQ/Ow== /home/demo/.ssh/id_rsa [[email protected]]# ssh-copy-id -i remote-host [email protected]‘s password: Now try logging into the machine, with "ssh ‘remote-host‘", and check in: .ssh/authorized_keys to make sure we haven‘t added extra keys that you weren‘t expecting. [Note: This has added the key displayed by ssh-add -L]
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