bash 以 root 身份无密码 ssh 到远程系统
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passwordless ssh to remote system as root
提问by cached
I need to ssh (as root) to a remote server and perform some root level operations. I will be sshing from a local server where I don't have root privileges. Given this option, is it possible to perform passwordless ssh to remote system using (rsa) keys ?
我需要 ssh（以 root 身份）到远程服务器并执行一些 root 级别的操作。我将从我没有 root 权限的本地服务器进行 sshing。鉴于此选项，是否可以使用 (rsa) 密钥对远程系统执行无密码 ssh ？
Local and remote servers run linux.
本地和远程服务器运行 linux。
BTW, I generated keys (ssh-keygen -t rsa) on the local server. Copied the public key to remote server's .ssh/authorized_keys file. However it still keeps prompting for password.The same setup works fine, if the local and remote username (non-root) matches.
顺便说一句，我在本地服务器上生成了密钥（ssh-keygen -t rsa）。将公钥复制到远程服务器的 .ssh/authorized_keys 文件。但是它仍然不断提示输入密码。如果本地和远程用户名（非 root）匹配，则相同的设置可以正常工作。
回答by Kun Ling
1 check that your /etc/ssh/sshd_config file have "PermitRootLogin yes".
1 检查您的 /etc/ssh/sshd_config 文件是否有“PermitRootLogin yes”。
2 Store the following Shell code into nopasswd.sh:
2 将以下 Shell 代码存储到 nopasswd.sh 中：
#!/bin/sh
scp ~/.ssh/id_dsa.pub @:~/
ssh @ "cat ~/id_dsa.pub >> ~/.ssh/authorized_keys; chmod 644 ~/.ssh/authorized_keys; exit"
3 Use it by these steps:
3 按以下步骤使用：
$ssh-keygen -t dsa
$ ./nopasswd.sh root REMOTE_HOST
回答by perreal
In ~/.ssh/config:
在 ~/.ssh/config 中：
Host rootRemoteSystem
HostName RemoteSystem
User root
Then:
然后：
ssh-copy-id rootRemoteSystem
Then you can do:
然后你可以这样做：
ssh rootRemoteSystem
回答by that other guy
Yes. SSH does not make a connection between account names on different systems, so you can ssh as non-root to root if you have a valid key pair.
是的。SSH 不会在不同系统上的帐户名之间建立连接，因此如果您有有效的密钥对，您可以以非 root 身份通过 ssh 连接到 root。
