SSH无需密码登录Linux服务器

共计 1582 个字符，预计需要花费 4 分钟才能阅读完成。

使用下例中 ssky-keygen 和 ssh-copy-id，仅需通过 3 个步骤的简单设置而无需输入密码就能登录远程 Linux 主机。
ssh-keygen 创建公钥和密钥。
ssh-copy-id 把本地主机的公钥复制到远程主机的 authorized_keys 文件上。
ssh-copy-id 也会给远程主机的用户主目录（home）和~/.ssh, 和~/.ssh/authorized_keys 设置合适的权限。

步骤 1: 用 ssh-key-gen 在本地主机上创建公钥和密钥

linuxidc@local-host$ ssh-keygen -t rsa
Enter file in which to save the key (/home/jsmith/.ssh/id_rsa):[Enter key] 
Enter passphrase (empty for no passphrase): [Press enter key]
Enter same passphrase again: [Pess enter key]
Your identification has been saved in /home/jsmith/.ssh/id_rsa.
Your public key has been saved in /home/jsmith/.ssh/id_rsa.pub. 
The key fingerprint is: 33:b3:fe:af:95:95:18:11:31:d5:de:96:2f:f2:35:f9 
linuxidc@local-host

步骤 2: 用 ssh-copy-id 把公钥复制到远程主机上

linuxidc@local-host$ ssh-copy-id -i ~/.ssh/id_rsa.pub root@192.168.0.3
linuxidc@remote-host‘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.

[注: ssh-copy-id 把密钥追加到远程主机的 .ssh/authorized_key 上.]

linuxidc@local-host$ ssh remote-host 
Last login: Sun Nov 16 17:22:33 2008 from 192.168.1.2 
linuxidc@remote-host$ 

[注: 你现在已经登录到了远程主机上]

提高 Ubuntu 的 SSH 登陆认证速度的办法 http://www.linuxidc.com/Linux/2014-09/106810.htm

开启 SSH 服务让 Android 手机远程访问 Ubuntu 14.04  http://www.linuxidc.com/Linux/2014-09/106809.htm

如何为 Linux 系统中的 SSH 添加双重认证 http://www.linuxidc.com/Linux/2014-08/105998.htm

在 Linux 中为非 SSH 用户配置 SFTP 环境 http://www.linuxidc.com/Linux/2014-08/105865.htm

Linux 上 SSH 服务的配置和管理 http://www.linuxidc.com/Linux/2014-06/103627.htm

SSH 入门学习基础教程 http://www.linuxidc.com/Linux/2014-06/103008.htm

SSH 免密码登录详解  http://www.linuxidc.com/Linux/2015-03/114709.htm

本文永久更新链接地址 ：http://www.linuxidc.com/Linux/2015-05/117794.htm