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SSH免密登陆

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经常用 ssh 连接服务器，这里主要记下怎么免密码登录

连接服务器

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ssh root@127.0.0.1 -p 2222
# ssh 用户@host -p 端口

免密码登录

用 ssh-keygen 创建公钥

在客户端创建公钥

如提示输入密码可忽略

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ssh-keygen -t rsa

<!-- 你会看到以下代码 -->
Generating public/private rsa key pair.
Enter file in which to save the key (/home/haifeng/.ssh/id_rsa):
Enter passphrase (empty for no passphrase):
Enter same passphrase again:
Your identification has been saved in /home/haifeng/.ssh/id_rsa.
Your public key has been saved in /home/haifeng/.ssh/id_rsa.pub.
The key fingerprint is:
7b:75:98:eb:fd:13:ce:0f:c4:cf:2c:65:cc:73:70:53 haifeng@haifeng-EX38-DS4
The key's randomart image is:
+--[ RSA 2048]----+
|                E|
|                .|
|              ...|
|             + =.|
|        S   + +.*|
|         . . + Bo|
|        . . . = =|
|         . . . * |
|            . ..=|
+-----------------+

查看

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ls ~/.ssh/
# id_rsa  id_rsa.pub  known_hosts

上传公钥

在服务器上创建authorized_keys并修改权限

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touch ~/.ssh/authorized_keys
chmod 600 ~/.ssh/authorized_keys

注意： 必须将~/.ssh/authorized_keys的权限改为 600

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scp ~/.ssh/id_rsa.pub root@127.0.0.1:~/.ssh/authorized_keys
# scp 本地公钥 user@host:~/.ssh/authorized_keys

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