CentOS 8解决ssh连接github时sign_and_send_pubkey失败问题

我在一台centos8机器上安装git环境以连接到github，首先第一步需配置好ssh环境，因为我已经有一台Ubuntu机器已经配置好ssh环境，所以我ftp Ubuntu机器取得id_rsa id_rsa.pub known_hosts三个文件，然后执行命令：

$ git clone git@github.com:your-username/learning_log.git

Cloning into 'learning_log'...

Warning: Permanently added the ECDSA host key for IP address '20.205.243.166' to the list of known hosts.

sign_and_send_pubkey: signing failed: agent refused operation

git@github.com: Permission denied (publickey).

fatal: Could not read from remote repository.

Please make sure you have the correct access rights

and the repository exists.

明显失败了

然后执行以下命令直接用ssh测试：

sign_and_send_pubkey: signing failed: agent refused operation

git@github.com: Permission denied (publickey).

还是失败

然后执行：

$eval "$ (ssh-agent -k)"

SSH_AGENT_PID not set, cannot kill agent

$eval "$ (ssh-agent -s)"

Agent pid 35072

然后执行：

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

@ WARNING: UNPROTECTED PRIVATE KEY FILE! @

@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

Permissions 0664 for '/home/zhang/.ssh/id_rsa' are too open.

It is required that your private key files are NOT accessible by others.

This private key will be ignored.

Load key "/home/zhang/.ssh/id_rsa": bad permissions

git@github.com: Permission denied (publickey).

毛病找到了，是密钥文件的权限问题。然后执行：

$ chmod 600 id*

$ chmod 644 k*

然后执行：

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

问题总结：是因为我ftp Ubuntu机器get密钥文件到本地的时候权限变了，ssh代理拒绝代理了。