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NVE: SSH-palvelua ei voi käynnistää NVE:llä

Summary: NetWorker Virtual Edition (NVE) -laitetta ei voi käyttää SSH:n kautta. NVE on muuten toiminnassa, eikä sillä ole vaikutusta tietosuojatoimintoihin.

This article applies to This article does not apply to This article is not tied to any specific product. Not all product versions are identified in this article.

Symptoms

NetWorker-ratkaisuun on määritetty NetWorker Virtual Edition (NVE) -laite, mutta sitä ei voi käyttää SSH-yhteydellä.  NVE-järjestelmänvalvojan hallintaportaalit ovat edelleen käytettävissä (NetWorker Management Console, NetWorker Web User Interface ja NetWorker Installation Manager), ja myös varmuuskopiointi- ja palautustoiminto toimii onnistuneesti.  NVE-käyttöjärjestelmän liittymää voi käyttää vSphere Web Client -etäkonsolin kautta.  

SSHD-palvelu ei ole käynnissä ja ilmoittaa seuraavaa:
nve:~ # systemctl start sshd.service
Job for sshd.service failed because the control process exited with error code. See "systemctl status sshd.service" and "journalctl -xe" for details.

nve:~ # systemctl status sshd.service
● sshd.service - OpenSSH Daemon
   Loaded: loaded (/usr/lib/systemd/system/sshd.service; enabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since Tue 2021-04-27 15:43:49 EDT; 17s ago
  Process: 6576 ExecStart=/usr/sbin/sshd -D $SSHD_OPTS (code=exited, status=0/SUCCESS)
  Process: 12164 ExecStartPre=/usr/sbin/sshd -t $SSHD_OPTS (code=exited, status=255)
  Process: 12161 ExecStartPre=/usr/sbin/sshd-gen-keys-start (code=exited, status=0/SUCCESS)
 Main PID: 6576 (code=exited, status=0/SUCCESS)
    Tasks: 6
   CGroup: /system.slice/sshd.service
           ├─11434 sshd: admin@pts/0
           ├─11438 -bash
           ├─11939 sudo su
           ├─11942 su
           ├─11943 bash
           └─12169 systemctl status sshd.service

Apr 27 15:43:48 nve systemd[1]: Failed to start OpenSSH Daemon.
Apr 27 15:43:48 nve systemd[1]: sshd.service: Unit entered failed state.
Apr 27 15:43:48 nve systemd[1]: sshd.service: Failed with result 'exit-code'.
Apr 27 15:43:49 nve systemd[1]: sshd.service: Service RestartSec=100ms expired, scheduling restart.
Apr 27 15:43:49 nve systemd[1]: Stopped OpenSSH Daemon.
Apr 27 15:43:49 nve systemd[1]: sshd.service: Start request repeated too quickly.
Apr 27 15:43:49 nve systemd[1]: Failed to start OpenSSH Daemon.
Apr 27 15:43:49 nve systemd[1]: sshd.service: Unit entered failed state.
Apr 27 15:43:49 nve systemd[1]: sshd.service: Failed with result 'start-limit'.

/var/log/messages-tiedostossa todetaan, että sshd_config tiedostossa on ongelma:
nve:~ # tail -n 30 /var/log/messages | grep ssh
Apr 27 15:43:48 nve systemd[1]: sshd.service: Service RestartSec=100ms expired, scheduling restart.
Apr 27 15:43:48 nve sshd-gen-keys-start[12161]: Checking for missing server keys in /etc/ssh
Apr 27 15:43:48 nve ssh-keygen[12162]: OWB:ERROR:BSAFELIB:func(112):reason(113):b_dsa.c:112
Apr 27 15:43:48 nve sshd-gen-keys-start[12161]: ssh-keygen: generating new host keys: DSA key_generate failed: error in libcrypto
Apr 27 15:43:48 nve sshd[12164]: /etc/ssh/sshd_config line 171: Directive 'kexalgorithms' is not allowed within a Match block
Apr 27 15:43:48 nve systemd[1]: sshd.service: Control process exited, code=exited status=255
Apr 27 15:43:48 nve systemd[1]: sshd.service: Unit entered failed state.
Apr 27 15:43:48 nve systemd[1]: sshd.service: Failed with result 'exit-code'.
Apr 27 15:43:49 nve systemd[1]: sshd.service: Service RestartSec=100ms expired, scheduling restart.
Apr 27 15:43:49 nve systemd[1]: sshd.service: Start request repeated too quickly.
Apr 27 15:43:49 nve systemd[1]: sshd.service: Unit entered failed state.
Apr 27 15:43:49 nve systemd[1]: sshd.service: Failed with result 'start-limit'.

Cause

NVE /etc/ssh/sshd_config tiedosto sisältää kexalgorithms-merkinnän, jota ei poistettu aiemman NVE-päivityksen yhteydessä. 

nve:~ # cat /etc/ssh/sshd_config | grep -b2 kexalgorithms
Match Address ::1,127.0.0.1,127.0.0.1,127.0.0.2,::1,10.0.0.3,fe80::250:56ff:febb:58e7
   PermitRootLogin yes
kexalgorithms diffie-hellman-group-exchange-sha256,ecdh-sha2-nistp256,ecdh-sha2-nistp384,ecdh-sha2-nistp521,curve25519-sha256@libssh.org

 

Resolution

Poista kexalgorithms-merkintä tiedostosta /etc/ssh/sshd_config.
  1. Avaa vSphere Web Client -työasemasta konsoli-etäistunto NVE:hen
  2. Todenna NVE:hen pääkäyttäjän avulla
  3. Avaa /etc/ssh/sshd_config tiedosto tekstinkäsittelyohjelmassa: vi /etc/ssh/sshd_config
  4. Poista tai kommentoi kexalgorithms-rivi
  5. Tallenna muutokset tiedostoon /etc/ssh/sshd_config.
  6. Käynnistä SSHD-palvelu: systemctl start sshd.service

Additional Information

Affected Products

NetWorker
Article Properties
Article Number: 000185884
Article Type: Solution
Last Modified: 11 Oct 2023
Version:  4
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