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Github : Permission denied (publickey)

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Issue:
Issue with setting up a new repos on local workstation, while trying to push the code to remote git repository.
Stack trace looks like:
        Permission denied (publickey). fatal: Could not read from remote repository.



How it could be resolved:  


$ ssh -vT git@github.com

OpenSSH_6.9p1, LibreSSL 2.1.8
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to github.com [192.30.252.130] port 22.
debug1: Connection established.
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_rsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.9
debug1: Remote protocol version 2.0, remote software version libssh-0.7.0
debug1: no match: libssh-0.7.0
debug1: Authenticating to github.com:22 as 'git'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client chacha20-poly1305@openssh.com none
debug1: kex: client->server chacha20-poly1305@openssh.com none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ssh-rsa SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8
debug1: Host 'github.com' is known and matches the RSA host key.
debug1: Found key in /Users/gauravbalyan/.ssh/known_hosts:4
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /Users/gauravbalyan/.ssh/id_rsa
debug1: Trying private key: /Users/gauravbalyan/.ssh/id_dsa
debug1: Trying private key: /Users/gauravbalyan/.ssh/id_ecdsa
debug1: Trying private key: /Users/gauravbalyan/.ssh/id_ed25519
debug1: No more authentication methods to try.
Permission denied (publickey).

Now I check the keys under ~/.ssh
$ cd /Users/gauravbalyan/.ssh/
$ ls

github_rsa github_rsa.pub known_hosts

I could not see public/private rsa key pair.




Fix: $ ssh-keygen
$ ls
github_rsa github_rsa.pub id_rsa id_rsa.pub known_hosts

now I can see rsa key pair. 

To test the connection with git. 

ssh -vT git@github.com
OpenSSH_6.9p1, LibreSSL 2.1.8
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug1: Connecting to github.com [192.30.252.130] port 22.
debug1: Connection established.
debug1: identity file /Users/gauravbalyan/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /Users/gauravbalyan/.ssh/id_ed25519-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.9
debug1: Remote protocol version 2.0, remote software version libssh-0.7.0
debug1: no match: libssh-0.7.0
debug1: Authenticating to github.com:22 as 'git'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client chacha20-poly1305@openssh.com none
debug1: kex: client->server chacha20-poly1305@openssh.com none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ssh-rsa SHA256:nThbg6kXUpJWGl7E1IGOCspRomTxdCARLviKw6E5SY8
debug1: Host 'github.com' is known and matches the RSA host key.
debug1: Found key in /Users/gauravbalyan/.ssh/known_hosts:4
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: Roaming not allowed by server
debug1: SSH2_MSG_SERVICE_REQUEST sent
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /Users/gauravbalyan/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug1: Authentication succeeded (publickey).
ebug1: client_input_channel_req: channel 0 rtype exit-status reply 0
Hi gauravbalyan! You've successfully authenticated, but GitHub does not provide shell access.
debug1: channel 0: free: client-session, nchannels 1


Congratulations! your test is successful. 
Now you have to copy the key in your github account in ssh key section and add a new key. 
To check the key on your workstation: 
                                    $ cat id_rsa.pub 

It must begin with 'ssh-ed25519', 'ssh-rsa', 'ssh-dss', 'ecdsa-sha2-nistp256', 'ecdsa-sha2-nistp384', or 'ecdsa-sha2-nistp521'.

 To confirm with the target repos:
it ls-remote "git@github.com:user_name/repos_name.git"


Now you can push the code using your git command. 

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