在我的本地机器上，我可以毫无问题地推送到git repo，而不会被要求提供密码。
在远程机器上，每当我尝试推动时，我都会感到害怕：
-bash-4.1$ git pull origin master
Permission denied (publickey).
fatal: Could not read from remote repository.
Please make sure you have the correct access rights
and the repository exists.
~/.ssh/id_rsa.pub的内容在两台机器上都是相同的。如果我尝试将密钥添加到我的GitHub帐户，GitHub会告诉我它已被添加。
为什么我可以在一台机器上访问repo而不是另一台机器？
这是我在远程计算机上尝试ssh到github时得到的结果：
-bash-4.1$ ssh -vT git@github.com
OpenSSH_6.1p1, OpenSSL 1.0.0-fips 29 Mar 2010
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 50: Applying options for *
debug1: Connecting to github.com [192.30.252.131] port 22.
debug1: Connection established.
debug1: identity file /home/apsmith/.ssh/id_rsa type 1
debug1: identity file /home/apsmith/.ssh/id_rsa-cert type -1
debug1: identity file /home/apsmith/.ssh/id_dsa type 1
debug1: identity file /home/apsmith/.ssh/id_dsa-cert type -1
debug1: Remote protocol version 2.0, remote software version libssh-0.6.0
debug1: no match: libssh-0.6.0
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_6.1
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: server->client aes128-ctr hmac-sha1 none
debug1: kex: client->server aes128-ctr hmac-sha1 none
debug1: sending SSH2_MSG_KEXDH_INIT
debug1: expecting SSH2_MSG_KEXDH_REPLY
debug1: Server host key: RSA 16:27:ac:a5:76:28:2d:36:63:1b:56:4d:eb:df:a6:48
debug1: Host 'github.com' is known and matches the RSA host key.
debug1: Found key in /home/apsmith/.ssh/known_hosts:1
debug1: ssh_rsa_verify: signature correct
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: /home/apsmith/.ssh/id_rsa
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug1: Offering RSA public key: /home/apsmith/.ssh/id_dsa
debug1: Server accepts key: pkalg ssh-rsa blen 279
debug1: No more authentication methods to try.
Permission denied (publickey).
在远程计算机上，以下文件位于〜/ .ssh目录中：
-bash-4.1$ ls ~/.ssh/
authorized_keys id_dsa.pub id_rsa.pub known_hosts