VM-2克隆GitHub仓库遭遇git@github.com: Permission denied (publickey)错误的求助

大家好，我正在搭建持续部署（CD）流水线，一开始在服务器上的VM-1上运行一切正常。现在想把这套流程迁移到同一服务器上的VM-2，我手动把VM-1的SSH公私钥复制到了VM-2上（本来想着之后删掉VM-1，所以一开始没给VM-2生成新密钥）。但现在在VM-2上尝试克隆仓库时，遇到了这个错误：

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.

我执行了la -la ~/.ssh命令，输出如下：

drwx------  2 ssh123 root     4096 Mär 29 16:27 .
drwxr-xr-x 20 ssh123 root     4096 Mär 29 16:27 ..
-rwx------  1 ssh123 root      628 Mär 29 11:10 authorized_keys2
-rwx------  1 ssh123 w014b01d  419 Mär 29 16:27 id_server_ed25519
-rwx------  1 ssh123 w014b01d  105 Mär 29 16:26 id_server_ed25519.pub
-rw-r--r--  1 ssh123 w014b01d  666 Mär 29 16:29 known_hosts

然后我跑了ssh -vvv git@github.com（之前手滑多打了个T，已经修正），详细日志如下：

OpenSSH_8.2p1 Ubuntu-4ubuntu0.11, OpenSSL 1.1.1f  31 Mar 2020
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: include /etc/ssh/ssh_config.d/*.conf matched no files
debug1: /etc/ssh/ssh_config line 21: Applying options for *
debug2: resolving "github.com" port 22
debug2: ssh_connect_direct
debug1: Connecting to github.com [1.1.1.4] port 22.
debug1: Connection established.
debug1: identity file /.ssh/id_rsa type -1
debug1: identity file /.ssh/id_rsa-cert type -1
debug1: identity file /.ssh/id_dsa type -1
debug1: identity file /.ssh/id_dsa-cert type -1
debug1: identity file /.ssh/id_ecdsa type -1
debug1: identity file /.ssh/id_ecdsa-cert type -1
debug1: identity file /.ssh/id_ecdsa_sk type -1
debug1: identity file /.ssh/id_ecdsa_sk-cert type -1
debug1: identity file /.ssh/id_ed25519 type -1
debug1: identity file /.ssh/id_ed25519-cert type -1
debug1: identity file /.ssh/id_ed25519_sk type -1
debug1: identity file /.ssh/id_ed25519_sk-cert type -1
debug1: identity file /.ssh/id_xmss type -1
debug1: identity file /.ssh/id_xmss-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.11
debug1: Remote protocol version 2.0, remote software version babeld-05989c77
debug1: no match: babeld-05989c77
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to github.com:22 as 'git'
debug3: hostkeys_foreach: reading file "/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from github.com
debug3: order_hostkeyalgs: have matching best-preference key type ecdsa-sha2-nistp256-cert-v01@openssh.com, using HostkeyAlgorithms verbatim
debug3: send packet: type 20
debug1: SSH2_MSG_KEXINIT sent
debug3: receive packet: type 20
debug1: SSH2_MSG_KEXINIT received
debug2: local client KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group14-sha256,ext-info-c,kex-strict-c-v00@openssh.com
debug2: host key algorithms: ecdsa-sha2-nistp256-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,ssh-ed25519-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,sk-ecdsa-sha2-nistp256@openssh.com,ssh-ed25519,sk-ssh-ed25519@openssh.com,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes128-ctr,aes192-ctr,aes256-ctr,aes128-gcm@openssh.com,aes256-gcm@openssh.com
debug2: MACs ctos: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: umac-64-etm@openssh.com,umac-128-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512-etm@openssh.com,hmac-sha1-etm@openssh.com,umac-64@openssh.com,umac-128@openssh.com,hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug2: peer server KEXINIT proposal
debug2: KEX algorithms: curve25519-sha256,curve25519-sha256@libssh.org,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,kex-strict-s-v00@openssh.com
debug2: host key algorithms: ssh-ed25519,ecdsa-sha2-nistp256,rsa-sha2-512,rsa-sha2-256,ssh-rsa
debug2: ciphers ctos: chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
debug2: ciphers stoc: chacha20-poly1305@openssh.com,aes256-gcm@openssh.com,aes128-gcm@openssh.com,aes256-ctr,aes192-ctr,aes128-ctr
debug2: MACs ctos: hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512,hmac-sha2-256
debug2: MACs stoc: hmac-sha2-512-etm@openssh.com,hmac-sha2-256-etm@openssh.com,hmac-sha2-512,hmac-sha2-256
debug2: compression ctos: none,zlib@openssh.com,zlib
debug2: compression stoc: none,zlib@openssh.com,zlib
debug2: languages ctos: 
debug2: languages stoc: 
debug2: first_kex_follows 0 
debug2: reserved 0 
debug3: will use strict KEX ordering
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
debug3: send packet: type 30
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug3: receive packet: type 31
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:p2xxxx98/Rxxxx3/Lxxxx
debug3: hostkeys_foreach: reading file "/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /.ssh/known_hosts:1
debug3: load_hostkeys: loaded 1 keys from github.com
debug3: hostkeys_foreach: reading file "/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /.ssh/known_hosts:3
debug3: load_hostkeys: loaded 1 keys from 140.82.121.4
debug1: Host 'github.com' is known and matches the ECDSA host key.
debug1: Found key in /.ssh/known_hosts:1
debug3: send packet: type 21
debug1: resetting send seqnr 3
debug2: set_newkeys: mode 1
debug1: rekey out after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: resetting read seqnr 3
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey in after 134217728 blocks
debug1: Will attempt key: /.ssh/id_rsa 
debug1: Will attempt key: /.ssh/id_dsa 
debug1: Will attempt key: /.ssh/id_ecdsa 
debug1: Will attempt key: /.ssh/id_ecdsa_sk 
debug1: Will attempt key: /.ssh/id_ed25519 
debug1: Will attempt key: /.ssh/id_ed25519_sk 
debug1: Will attempt key: /.ssh/id_xmss 
debug2: pubkey_prepare: done
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519-cert-v01@openssh.com,ecdsa-sha2-nistp521-cert-v01@openssh.com,ecdsa-sha2-nistp384-cert-v01@openssh.com,ecdsa-sha2-nistp256-cert-v01@openssh.com,sk-ssh-ed25519-cert-v01@openssh.com,sk-ecdsa-sha2-nistp256-cert-v01@openssh.com,rsa-sha2-512-cert-v01@openssh.com,rsa-sha2-256-cert-v01@openssh.com,ssh-rsa-cert-v01@openssh.com,sk-ssh-ed25519@openssh.com,sk-ecdsa-sha2-nistp256@openssh.com,ssh-ed25519,ecdsa-sha2-nistp521,ecdsa-sha2-nistp384,ecdsa-sha2-nistp256,rsa-sha2-512,rsa-sha2-256,ssh-rsa>
debug3: receive packet: type 6
debug2: service_accept: ssh-userauth
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug3: send packet: type 50
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey
debug3: start over, passed a different list publickey
debug3: preferred gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Trying private key: /.ssh/id_rsa
debug3: no such identity: /.ssh/id_rsa: No such file or directory
debug1: Trying private key: /.ssh/id_dsa
debug3: no such identity: /.ssh/id_dsa: No such file or directory
debug1: Trying private key: /.ssh/id_ecdsa
debug3: no such identity: /.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /.ssh/id_ecdsa_sk
debug3: no such identity: /.ssh/id_ecdsa_sk: No such file or directory
debug1: Trying private key: /.ssh/id_ed25519
debug3: no such identity: /.ssh/id_ed25519: No such file or directory
debug1: Trying private key: /.ssh/id_ed25519_sk
debug3: no such identity: /.ssh/id_ed25519_sk: No such file or directory
debug1: Trying private key: /.ssh/id_xmss
debug3: no such identity: /.ssh/id_xmss: No such file or directory
debug2: we did not send a packet, disable method
debug1: No more authentication methods to try.
git@github.com: Permission denied (publickey).

看日志的时候我发现两个疑点：一是SSH一直在找/.ssh/id_ed25519这类默认命名的密钥，但我复制过来的密钥是id_server_ed25519；二是日志里的路径是/.ssh/而不是~/.ssh/，这会不会是问题的根源？有没有大佬能帮我分析下怎么解决这个权限被拒的问题？

备注：内容来源于stack exchange，提问作者MartinTTS