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最近弄了台linux云服务器，然而每次登陆linux都好麻烦，所以倒腾了下ssh无密登陆。
linux：centos 6.5，自带ssh
mac：yosemite，自带ssh
步骤：
1. 创建key
? .ssh ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/Users/yinkw/.ssh/id_rsa): <--直接回车 Enter passphrase (empty for no passphrase): <--直接回车 Enter same passphrase again: Your identification has been saved in /Users/yinkw/.ssh/id_rsa. Your public key has been saved in /Users/yinkw/.ssh/id_rsa.pub. The key fingerprint is: 07:20:96:中间这一段藏起来:d1 yinkw@yinkw.local The key‘s randomart image is: +--[ RSA 2048]----+ | ooooo=o+ | | ...+o= + E | | . *.+ . | | . =.+ | | S=.. | | .o | | | | | | | +-----------------+ ? .ssh ll total 16 -rw------- 1 yinkw staff 1.6K 10 6 12:11 id_rsa <--私钥 -rw-r--r-- 1 yinkw staff 399B 10 6 12:11 id_rsa.pub <--公钥
2. 拷贝公钥到linux
? .ssh scp id_rsa.pub root@19.29.～～:~/.ssh root@119.29.～～‘s password: id_rsa.pub 100% 399 0.4KB/s 00:00
3. linux，公钥内容追加到authorized_keys
[root@centos]~/.ssh# ll 总用量 4 -rw-r--r-- 1 root root 0 9月 15 00:27 authorized_keys -rw-r--r-- 1 root root 399 10月 6 12:26 id_rsa.pub [root@centos]~/.ssh# cat id_rsa.pub >> authorized_keys
4. mac测试
? ~ ssh root@119.29.～～ Last login: Thu Oct 6 12:06:38 2016 from 101.106.～～
诶诶，这是怎么回事，没用重启sshd服务，却已经可以使用rsakey登陆了
5. linux关闭passwd登陆
/etc/ssh/sshd_config：
PermitEmptyPasswords no
关掉passwd登陆后自我感觉安全多了
--done--
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原文地址：http://www.cnblogs.com/yinkw/p/5933690.html
