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[Translated]20150323 How to enable ssh login without entering password
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[translating by KayGuoWhu]
How to enable ssh login without entering password
================================================================================
Assume that you are a user "aliceA" on hostA, and wish to ssh to hostB as user "aliceB", without entering her password on hostB. You can follow this guide to **enable ssh login without entering a password**.
First of all, you need to be logged in as user "aliceA" on hostA.
Generate a public/private rsa key pair by using ssh-keygen. The generated key pair will be stored in ~/.ssh directory.
$ ssh-keygen -t rsa
Then, create ~/.ssh directory on aliceB account at the destination hostB by running the following command. This step can be omitted if there is already .ssh directory at aliceB@hostB.
$ ssh aliceB@hostB mkdir -p .ssh
Finally, copy the public key of user "aliceA" on hostA to aliceB@hostB to enable password-less ssh.
$ cat .ssh/id_rsa.pub | ssh aliceB@hostB 'cat >> .ssh/authorized_keys'
From this point on, you no longer need to type in password to ssh to aliceB@hostB from aliceA@hostA.
### Troubleshooting ###
1. You are still asked for an SSH password even after enabling key authentication. In this case, check for system logs (e.g., /var/log/secure) to see if you see something like the following.
Authentication refused: bad ownership or modes for file /home/aliceB/.ssh/authorized_keys
In this case, failure of key authentication is due to the fact that the permission or ownership ~/.ssh/authorized_keys file is not correct. Typically this error can happen if ~/.ssh/authorized_keys is read accessible to anyone but yourself. To fix this problem, change the file permission as follows.
$ chmod 700 ~/.ssh/authorized_keys
--------------------------------------------------------------------------------
via: http://xmodulo.com/how-to-enable-ssh-login-without.html
作者：[Dan Nanni][a]
译者：[译者ID](https://github.com/译者ID)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
[a]:http://xmodulo.com/author/nanni

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如何实现ssh无密码登录
================================================================================
假设你是hostA上的一个用户"aliceA"，想以用户“aliceB”的身份ssh到hostB上，但又不想输入密码。那么，你可以参考这篇教程实现ssd无密码登录。
首先，你需要以用户“aliceA”的身份登录到hostA上。
然后，使用ssh-keygen生成一对rsa公私钥，生成的密钥对会存放在~/.ssh目录下。
$ ssh-keygen -t rsa
接下来，使用下面的命令在目标主机hostB上的aliceB用户目录下创建~/.ssh目录。如果在aliceB@hostB上已经存在.ssh目录，这一步会被略过。
$ ssh aliceB@hostB mkdir -p .ssh
最后，将hostA上用户“aliceA”的公钥拷贝到aliceB@hostB上，来实现无密码ssh。
$ cat .ssh/id_rsa.pub | ssh aliceB@hostB 'cat >> .ssh/authorized_keys'
自此以后，从aliceA@hostA上ssh到aliceB@hostB上再也不需要输入密码。
### 疑难解答 ###
1. 即使在密钥认证生效后，你可能仍然需要输入SSH密码。如果遇到这种情况，请检查系统日志（如/var/log/secure）以查看是否出现下面的异常。
Authentication refused: bad ownership or modes for file /home/aliceB/.ssh/authorized_keys
在这种情况下，密钥认证的失败是由于~/.ssh/authorized_keys文件的权限或拥有者不正确。一般情况，如果这个文件对除了你之外的所有用户都可读，就会出现这个错误。用下面的方式改变文件的权限以修正错误。
$ chmod 700 ~/.ssh/authorized_keys
--------------------------------------------------------------------------------
via: http://xmodulo.com/how-to-enable-ssh-login-without.html
作者：[Dan Nanni][a]
译者：[KayGuoWhu](https://github.com/KayGuoWhu)
校对：[校对者ID](https://github.com/校对者ID)
本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
[a]:http://xmodulo.com/author/nanni