代码仓库是gitlab搭建的，通过密钥配置，ssh -T git@gitlab.com 是可以识别到密钥代表的用户名的，项目上已经添加用户的权限，但是拉取报错，debug信息如下：
ssh -v git@git.gitlab.com -i /root/id_rsa_for_sohu
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 58: Applying options for *
debug1: Connecting to git.gitlab.com [10.66.250.12] port 22.
debug1: Connection established.
debug1: permanently_set_uid: 0/0
debug1: key_load_public: No such file or directory
debug1: identity file /root/id_rsa_for_sohu type -1
debug1: key_load_public: No such file or directory
debug1: identity file /root/id_rsa_for_sohu-cert type -1
debug1: Enabling compatibility mode for protocol 2.0
debug1: Local version string SSH-2.0-OpenSSH_7.4
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.4
debug1: match: OpenSSH_7.4 pat OpenSSH* compat 0x04000000
debug1: Authenticating to git.gitlab.com:22 as 'git'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:3w1238td7TLZeo1CNw
debug1: Host 'git.gitlab.com' is known and matches the ECDSA host key.
debug1: Found key in /root/.ssh/known_hosts:4
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug1: Next authentication method: gssapi-with-mic
debug1: Unspecified GSS failure. Minor code may provide more information
No Kerberos credentials available (default cache: KEYRING:persistent:0)
debug1: Unspecified GSS failure. Minor code may provide more information
No Kerberos credentials available (default cache: KEYRING:persistent:0)
debug1: Next authentication method: publickey
debug1: Trying private key: /root/id_rsa_for_sohu
debug1: Authentication succeeded (publickey).
Authenticated to git.gitlab.com ([192.168.2.1]:22).
debug1: channel 0: new [client-session]
debug1: Requesting no-more-sessions@openssh.com
debug1: Entering interactive session.
debug1: pledge: network
debug1: client_input_global_request: rtype hostkeys-00@openssh.com want_reply 0
debug1: Remote: Forced command.
debug1: Remote: Port forwarding disabled.
debug1: Remote: X11 forwarding disabled.
debug1: Remote: Agent forwarding disabled.
debug1: Remote: PTY allocation disabled.
debug1: Sending environment.
debug1: Sending env LANG = en_US.utf8
PTY allocation request failed on channel 0
Welcome to GitLab, @ad_reporter!
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug1: client_input_channel_req: channel 0 rtype eow@openssh.com reply 0
debug1: channel 0: free: client-session, nchannels 1
Connection to git.gitlab.com closed.
Transferred: sent 3048, received 2684 bytes, in 0.1 seconds
Bytes per second: sent 37015.0, received 32594.6
debug1: Exit status 0可尝试在当前目录下配置文件修改：.ssh/config
Host git.gitlab.com
HostName git.gitlab.com
User git
IdentityFile ~/.ssh/id_rsa_for_sohu
IdentitiesOnly yes猜测是环境变量发生了混乱，需要指明服务器，主机，用户，密钥，精准验证配置后就正常了。