原文链接 https://litaotao.github.io/tips-ssh-without-password
注：以下为加速网络访问所做的原文缓存，经过重新格式化，可能存在格式方面的问题，或偶有遗漏信息，请以原文为准。
写在前面
每次登录远程服务器都要输密码！！！
1. 事前准备
- 本地机器：local
- 远程机器：remote
2. 实操步骤
- 本地机器生成公钥，私钥:
ssh-keygen -t rsa
{% highlight shell %}
taotao@mac007:~$ssh-keygen -t rsa Generating public/private rsa key pair. Enter file in which to save the key (/Users/chenshan/.ssh/id_rsa): /Users/chenshan/.ssh/id_rsa_test Enter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /Users/chenshan/.ssh/id_rsa_test. Your public key has been saved in /Users/chenshan/.ssh/id_rsa_test.pub. The key fingerprint is: SHA256:gYV/PFrA08nktGUZ8LlFJ/Fhg7wDRjYQslmwf4UYJZc taotao@mac007 The key's randomart image is: +---[RSA 2048]----+ | =oXOO*o==.| | .oXoXE+=.+o| | .=.=+.+.o .| | o.= .= | | S= o. . | | . . | | | | | | | +----[SHA256]-----+
taotao@mac007:~$ls ~/.ssh/ | grep test id_rsa_test id_rsa_test.pub
{% endhighlight %}
- 上传本地公钥到远程机器:
scp ~/.ssh/id_rsa_test.pub username@remote:.ssh/id_rsa_test.pub
{% highlight shell %}
taotao@mac007:~$ scp ~/.ssh/id_rsa_test.pub username@remote:.ssh/id_rsa_test.pub username@remote's password: id_rsa_test.pub 100% 412 0.4KB/s 00:00
{% endhighlight %}
- 在远程机器上设置
authorized_keys:cat /root/.ssh/id_rsa_test.pub >> /root/.ssh/authorized_keys