我有 3 台服务器。其中 1 台服务器上有 2 个脚本：第 1 个脚本：
ssh [email protected] 'bash -s' < 2.sh
第二个脚本：
rsync -av --update /root/backup/* [email protected]:/root/backup/
我想通过 ssh 从第一台服务器使用第一个脚本连接到第二台服务器，并将数据从第二台服务器复制到第三台服务器。从第一台服务器到第二台服务器的连接正常，它要求输入 ssh 密码。之后必须提示输入 rsync 密码，但我收到错误。Rsync 不起作用。错误：
权限被拒绝，请重试。
权限被拒绝，请重试。
权限被拒绝（公钥、gssapi-keyex、gssapi-with-mic、密码）。
rsync：连接意外关闭（迄今为止已接收 0 个字节）[发送方]
rsync 错误：io.c(226) 处出现无法解释的错误（代码 255）[发送者=3.1.2]
服务器上的防火墙已禁用。当我不使用脚本在第二台服务器上执行 rsync 时，它可以正常工作。
问题是什么？
调试
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 *
debug2: resolving "1.1.1.2" port 22
debug2: ssh_connect_direct: needpriv 0
debug1: Connecting to 1.1.1.2 [1.1.1.2] port 22.
debug1: Connection established.
debug1: identity file /home/wso2admin/.ssh/id_rsa type 1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wso2admin/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wso2admin/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wso2admin/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wso2admin/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wso2admin/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wso2admin/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/wso2admin/.ssh/id_ed25519-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
debug2: fd 3 setting O_NONBLOCK
debug1: Authenticating to 1.1..2:22 as 'wso2admin'
debug3: hostkeys_foreach: reading file "/home/wso2admin/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/wso2admin/.ssh/known_hosts:3
debug3: load_hostkeys: loaded 1 keys from 1.1.1.2
debug3: order_hostkeyalgs: prefer hostkeyalgs: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521
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,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1,ext-info-c
debug2: host key algorithms: [email protected],[email protected],[email protected],ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521,[email protected],[email protected],[email protected],ssh-ed25519,rsa-sha2-512,rsa-sha2-256,ssh-rsa,ssh-dss
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected],zlib
debug2: compression stoc: none,[email protected],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,[email protected],ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,diffie-hellman-group-exchange-sha256,diffie-hellman-group16-sha512,diffie-hellman-group18-sha512,diffie-hellman-group-exchange-sha1,diffie-hellman-group14-sha256,diffie-hellman-group14-sha1,diffie-hellman-group1-sha1
debug2: host key algorithms: ssh-rsa,rsa-sha2-512,rsa-sha2-256,ecdsa-sha2-nistp256,ssh-ed25519
debug2: ciphers ctos: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
debug2: ciphers stoc: [email protected],aes128-ctr,aes192-ctr,aes256-ctr,[email protected],[email protected],aes128-cbc,aes192-cbc,aes256-cbc,blowfish-cbc,cast128-cbc,3des-cbc
debug2: MACs ctos: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: MACs stoc: [email protected],[email protected],[email protected],[email protected],[email protected],[email protected],[email protected],hmac-sha2-256,hmac-sha2-512,hmac-sha1
debug2: compression ctos: none,[email protected]
debug2: compression stoc: none,[email protected]
debug2: languages ctos:
debug2: languages stoc:
debug2: first_kex_follows 0
debug2: reserved 0
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: client->server cipher: [email protected] MAC: <implicit> compression: none
debug1: kex: curve25519-sha256 need=64 dh_need=64
debug1: kex: curve25519-sha256 need=64 dh_need=64
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:k6J9Ez5V+PiqaBfUlN6LM7MwBGfPOrOTv4P/eyC3sGI
debug3: hostkeys_foreach: reading file "/home/wso2admin/.ssh/known_hosts"
debug3: record_hostkey: found key type ECDSA in file /home/wso2admin/.ssh/known_hosts:3
debug3: load_hostkeys: loaded 1 keys from 1.1.1.2
debug1: Host '1.1.1.2' is known and matches the ECDSA host key.
debug1: Found key in /home/wso2admin/.ssh/known_hosts:3
debug3: send packet: type 21
debug2: set_newkeys: mode 1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug3: receive packet: type 21
debug1: SSH2_MSG_NEWKEYS received
debug2: set_newkeys: mode 0
debug1: rekey after 134217728 blocks
debug2: key: /home/wso2admin/.ssh/id_rsa (0x55c2a242b850)
debug2: key: /home/wso2admin/.ssh/id_dsa ((nil))
debug2: key: /home/wso2admin/.ssh/id_ecdsa ((nil))
debug2: key: /home/wso2admin/.ssh/id_ed25519 ((nil))
debug3: send packet: type 5
debug3: receive packet: type 7
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<rsa-sha2-256,rsa-sha2-512>
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,gssapi-keyex,gssapi-with-mic,password
debug3: start over, passed a different list publickey,gssapi-keyex,gssapi-with-mic,password
debug3: preferred gssapi-keyex,gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_lookup gssapi-keyex
debug3: remaining preferred: gssapi-with-mic,publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-keyex
debug1: Next authentication method: gssapi-keyex
debug1: No valid Key exchange context
debug2: we did not send a packet, disable method
debug3: authmethod_lookup gssapi-with-mic
debug3: remaining preferred: publickey,keyboard-interactive,password
debug3: authmethod_is_enabled gssapi-with-mic
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:1000)
debug1: Unspecified GSS failure. Minor code may provide more information
No Kerberos credentials available (default cache: KEYRING:persistent:1000)
debug2: we did not send a packet, disable method
debug3: authmethod_lookup publickey
debug3: remaining preferred: keyboard-interactive,password
debug3: authmethod_is_enabled publickey
debug1: Next authentication method: publickey
debug1: Offering RSA public key: /home/wso2admin/.ssh/id_rsa
debug3: send_pubkey_test
debug3: send packet: type 50
debug2: we sent a publickey packet, wait for reply
debug3: receive packet: type 51
debug1: Authentications that can continue: publickey,gssapi-keyex,gssapi-with-mic,password
debug1: Trying private key: /home/wso2admin/.ssh/id_dsa
debug3: no such identity: /home/wso2admin/.ssh/id_dsa: No such file or directory
debug1: Trying private key: /home/wso2admin/.ssh/id_ecdsa
debug3: no such identity: /home/wso2admin/.ssh/id_ecdsa: No such file or directory
debug1: Trying private key: /home/wso2admin/.ssh/id_ed25519
debug3: no such identity: /home/wso2admin/.ssh/id_ed25519: No such file or directory
debug2: we did not send a packet, disable method
debug3: authmethod_lookup password
debug3: remaining preferred: ,password
debug3: authmethod_is_enabled password
debug1: Next authentication method: password
[email protected]'s password:
debug3: send packet: type 50
debug2: we sent a password packet, wait for reply
debug3: receive packet: type 52
debug1: Authentication succeeded (password).
Authenticated to 1.1.1.2 ([1.1.1.2]:22).
debug2: fd 4 setting O_NONBLOCK
debug1: channel 0: new [client-session]
debug3: ssh_session2_open: channel_new: 0
debug2: channel 0: send open
debug3: send packet: type 90
debug1: Requesting [email protected]
debug3: send packet: type 80
debug1: Entering interactive session.
debug1: pledge: network
debug3: receive packet: type 80
debug1: client_input_global_request: rtype [email protected] want_reply 0
debug3: receive packet: type 91
debug2: callback start
debug2: fd 3 setting TCP_NODELAY
debug3: ssh_packet_set_tos: set IP_TOS 0x08
debug2: client_session2_setup: id 0
debug1: Sending environment.
debug3: Ignored env XDG_SESSION_ID
debug3: Ignored env HOSTNAME
debug3: Ignored env SHELL
debug3: Ignored env TERM
debug3: Ignored env HISTSIZE
debug3: Ignored env SSH_CLIENT
debug3: Ignored env SSH_TTY
debug3: Ignored env USER
debug3: Ignored env LS_COLORS
debug3: Ignored env PATH
debug3: Ignored env MAIL
debug3: Ignored env _
debug3: Ignored env PWD
debug3: Ignored env JAVA_HOME
debug1: Sending env LANG = en_US.UTF-8
debug2: channel 0: request env confirm 0
debug3: send packet: type 98
debug3: Ignored env HISTCONTROL
debug3: Ignored env HOME
debug3: Ignored env SHLVL
debug3: Ignored env LOGNAME
debug3: Ignored env SSH_CONNECTION
debug3: Ignored env LESSOPEN
debug3: Ignored env XDG_RUNTIME_DIR
debug1: Sending command: bash -s
debug2: channel 0: request exec confirm 1
debug3: send packet: type 98
debug2: callback done
debug2: channel 0: open confirm rwindow 0 rmax 32768
debug2: channel 0: rcvd adjust 2097152
debug3: receive packet: type 99
debug2: channel_input_status_confirm: type 99 id 0
debug2: exec request accepted on channel 0
debug2: channel 0: read<=0 rfd 4 len 0
debug2: channel 0: read failed
debug2: channel 0: close_read
debug2: channel 0: input open -> drain
debug2: channel 0: ibuf empty
debug2: channel 0: send eof
debug3: send packet: type 96
debug2: channel 0: input drain -> closed
debug2: channel 0: rcvd ext data 38
Permission denied, please try again.
debug2: channel 0: written 38 to efd 6
debug2: channel 0: rcvd ext data 38
Permission denied, please try again.
debug2: channel 0: written 38 to efd 6
debug2: channel 0: rcvd ext data 70
Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
debug2: channel 0: written 70 to efd 6
debug2: channel 0: rcvd ext data 73
debug2: channel 0: rcvd ext data 70
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: unexplained error (code 255) at io.c(226) [sender=3.1.2]
debug2: channel 0: written 143 to efd 6
debug3: receive packet: type 98
debug1: client_input_channel_req: channel 0 rtype exit-status reply 0
debug3: receive packet: type 96
debug2: channel 0: rcvd eof
debug2: channel 0: output open -> drain
debug2: channel 0: obuf empty
debug2: channel 0: close_write
debug2: channel 0: output drain -> closed
debug3: receive packet: type 97
debug2: channel 0: rcvd close
debug3: channel 0: will not send data after close
debug2: channel 0: almost dead
debug2: channel 0: gc: notify user
debug2: channel 0: gc: user detached
debug2: channel 0: send close
debug3: send packet: type 97
debug2: channel 0: is dead
debug2: channel 0: garbage collecting
debug1: channel 0: free: client-session, nchannels 1
debug3: channel 0: status: The following connections are open:
#0 client-session (t4 r0 i3/0 o3/0 fd -1/-1 cc -1)
debug3: send packet: type 1
debug1: fd 0 clearing O_NONBLOCK
Transferred: sent 2496, received 2836 bytes, in 0.1 seconds
Bytes per second: sent 18079.1, received 20541.8
debug1: Exit status 255
答案1
我不认为问题出在脚本上或者 rsync 没有从内部运行，而是出在第一个服务器中的 ssh 守护进程配置上。
您可以尝试编辑 /etc/ssh/sshd_config
PasswordAuthentication yes
错误似乎出在密码上，这让我认为要么你手动输入密码（确保它是正确的），但同时确保你确实允许密码登录。
由于您还使用 root，因此还必须确保 /etc/ssh/sshd_config 中存在以下内容
PermitRootLogin yes
您没有指定发行版，因此大多数发行版都会在该路径中，否则您可以检查您的具体信息或回答问题，我会尽力回答。
我还建议从服务器 a 运行：
ssh-copy-id root@serverb
服务器 b 上的情况与服务器 a 上的相同。
这样，您的密钥就会出现在原点和目标中，并且 ssh 不会要求输入密码。