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下载代码时遇到：

$ git clone git@github.com:huscience0/trainning.gitCloning into 'trainning'...git@github.com: Permission denied (publickey).fatal: Could not read from remote repository.Please make sure you have the correct access rightsand the repository exists.

调试：

$ ssh -T -v git@github.comOpenSSH_7.6p1 Ubuntu-4, OpenSSL 1.0.2n  7 Dec 2017debug1: Reading configuration data /etc/ssh/ssh_configdebug1: /etc/ssh/ssh_config line 19: Applying options for *debug1: Connecting to github.com [13.250.177.223] port 22.debug1: Connection established.debug1: key_load_public: No such file or directorydebug1: identity file /home/guang/.ssh/id_rsa type -1debug1: key_load_public: No such file or directorydebug1: identity file /home/guang/.ssh/id_rsa-cert type -1debug1: key_load_public: No such file or directorydebug1: identity file /home/guang/.ssh/id_dsa type -1debug1: key_load_public: No such file or directorydebug1: identity file /home/guang/.ssh/id_dsa-cert type -1debug1: key_load_public: No such file or directorydebug1: identity file /home/guang/.ssh/id_ecdsa type -1debug1: key_load_public: No such file or directorydebug1: identity file /home/guang/.ssh/id_ecdsa-cert type -1debug1: key_load_public: No such file or directorydebug1: identity file /home/guang/.ssh/id_ed25519 type -1debug1: key_load_public: No such file or directorydebug1: identity file /home/guang/.ssh/id_ed25519-cert type -1debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4debug1: Remote protocol version 2.0, remote software version libssh_0.7.0debug1: no match: libssh_0.7.0debug1: Authenticating to github.com:22 as 'git'debug1: SSH2_MSG_KEXINIT sentdebug1: SSH2_MSG_KEXINIT receiveddebug1: kex: algorithm: curve25519-sha256@libssh.orgdebug1: kex: host key algorithm: ssh-rsadebug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: 
   
     compression: nonedebug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: 
    
      compression: nonedebug1: expecting SSH2_MSG_KEX_ECDH_REPLYdebug1: Server host key: ssh-rsa SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8debug1: Host 'github.com' is known and matches the RSA host key.debug1: Found key in /home/guang/.ssh/known_hosts:1debug1: rekey after 134217728 blocksdebug1: SSH2_MSG_NEWKEYS sentdebug1: expecting SSH2_MSG_NEWKEYSdebug1: SSH2_MSG_NEWKEYS receiveddebug1: rekey after 134217728 blocksdebug1: SSH2_MSG_SERVICE_ACCEPT receiveddebug1: Authentications that can continue: publickeydebug1: Next authentication method: publickeydebug1: Trying private key: /home/guang/.ssh/id_rsadebug1: Trying private key: /home/guang/.ssh/id_dsadebug1: Trying private key: /home/guang/.ssh/id_ecdsadebug1: Trying private key: /home/guang/.ssh/id_ed25519debug1: No more authentication methods to try.git@github.com: Permission denied (publickey).guang@guang-ubuntu:~/Develop/trainning/liguang$
    
   

有这么一句，刚开始没懂什么意思(实际上是没有创建ssh秘钥的意思)：

debug1: key_load_public: No such file or directory

单独链接一下github，报：

$ ssh -T git@github.comgit@github.com: Permission denied (publickey).// 对应目录下面也没有生成id_rsa*文件$ cd ~/.ssh/guang@guang-ubuntu:~/.ssh$ lltotal 0drwx------  2 guang guang 4096 6月  20 11:49 ./drwxr-xr-x 19 guang guang 4096 6月  20 10:56 ../

结合上面的现象，基本上已经明确了没有创建ssh秘钥

ssh-keygen创建一个秘钥吧，秘钥路径与默认保持一致就好

$ ssh-keygenGenerating public/private rsa key pair.Enter file in which to save the key (/home/xxx/.ssh/id_rsa): /home/xxx/.ssh/id_rsaEnter passphrase (empty for no passphrase): Enter same passphrase again: Your identification has been saved in /home/xxx/.ssh/id_rsa.Your public key has been saved in /home/xxx/.ssh/id_rsa.pub.The key fingerprint is:xxxxxxxxxxxxxxxxxxxxx xxx@xxx-ubuntuThe key's randomart image is://无关紧要的log省略了..........

查看生成的秘钥：多了两个文件id_rsa*

$ lltotal 20drwx------  2 guang guang 4096 6月  20 11:49 ./drwxr-xr-x 19 guang guang 4096 6月  20 10:56 ../-rw-------  1 guang guang 1679 6月  20 11:49 id_rsa-rw-r--r--  1 guang guang  400 6月  20 11:49 id_rsa.pub

拷贝id_rsa.pub里面的内容到远程仓库，完成认证

点击右上角的头像图标–>Your profile–>Edit profile（左下角）

点击下图的SSH and GPG keys，点击New SSH keys，将id_rsa.pub里面的内容粘贴保存即可

这个时候就可以用git托管你的代码了