Ssh基础

Connecting to GitHub with SSH

Connecting to GitHub with SS

一 About SSH

二 Checking for existing SSH keys

$ ls -al ~/.ssh

$ ssh-add -l // 可以通过 ssh-add -l 来确私钥列表
可以通过 ssh-add -D 来清空私钥列表
$ ssh-add -D

三 Generating a new SSH key and adding it to the ssh-agent

3.1 Generating a new SSH key

$ ssh-keygen -t rsa -b 4096 -C “your_email@example.com“

Generating public/private rsa key pair.
Enter a file in which to save the key (/c/Users/you/.ssh/id_rsa):[Press enter]
Enter passphrase (empty for no passphrase): [Type a passphrase]
Enter same passphrase again: [Type passphrase again]

默认在 /c/users/administartor/.ssh/…
id_rsa:
id_rsa.pub: ssh-rsa AAAAB3NzaC1yc2E…
known_hosts:github添加成功后会写入：github.com,13.229.188.59 ssh-rsa AAAAB3NzaC1yc…

3.2 Adding your SSH key to the ssh-agent

$ eval $(ssh-agent -s)
$ ssh-add ~/.ssh/id_rsa

$PS: 如果多添加了没关系，反正关掉之后都没有了。需要重新启动ssh-agent, 执行ssh-add ~/.ssh/*/id_rsa

四 Adding a new SSH key to your GitHub account

$ clip < ~/.ssh/id_rsa.pub
然后去github/gitblit等git服务器添加SSH key

五 Testing your SSH connection

$ ssh -T git@github.com

The authenticity of host ‘github.com (IP ADDRESS)’ can’t be established.
RSA key fingerprint is SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8.
Are you sure you want to continue connecting (yes/no)?

Hi username! You’ve successfully authenticated, but GitHub does not provide shell access.

六 Working with SSH key passphrases

其他

## $_PS ssh-keygen删除旧密钥
linux 系统上使用ssh工具远程登录设备时，如果之前保存过该设备的密钥，之后该设备密钥更新，此时需执行以下命令才能后续的ssh正常登录。
ssh-keygen -f “/root/.ssh/known_hosts” -R 192.168.0.1
其中 -f filename 指定密钥文件名。
-R hostname 从 known_hosts 文件中删除所有属于 hostname 的密钥。