从Gitlab上使用ssh方式拉取git代码报错：The remote end hung up unexpected，经过排查，是公钥生成可能有问题，重新生成一下，然后在Gitlab上添加SSH key，再次拉取代码就好了。

SSH keys allow you to establish a secure connection between your computer and GitLa.（SSH Kyes用于本机和代码库主机建立信任。）

生成SSH Key

Open Git Bash.
Paste the text below, substituting in your GitHub email address.

Shell

ssh-keygen -t rsa -b 4096 -C "your_email@example.com"
# Creates a new ssh key, using the provided email as a label
Generating public/private rsa key pair.

Shell

Enter a file in which to save the key (/Users/you/.ssh/id_rsa): [Press enter]
At the prompt, type a secure passphrase. For more information, see “Working with SSH key passphrases”.

Shell

Enter passphrase (empty for no passphrase): [Type a passphrase]
Enter same passphrase again: [Type passphrase again]

生成好了，使用命令查看key，复制到Gitlab上。

cat ~/.ssh/id_rsa.pub