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SSH啟動失敗解決方法

   VPS是3個人合租共用的,不知道誰操作了什麼導致SSH啟動失敗,一直連接不上剛開始以為系統壞了呢,後面通過VPS終端登陸上去發現SSH服務沒在運行,於是嘗試運行SSHD發現出現如下錯誤:

  Starting sshd:

  @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

  @ WARNING: UNPROTECTED PRIVATE KEY FILE! @

  @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

  Permissions 0777 for ‘/etc/ssh/ssh_host_rsa_key’ are too open.

  It is recommended that your private key files are NOT accessible by others.

  This private key will be ignored.

  bad permissions: ignore key: /etc/ssh/ssh_host_rsa_key

  Could not load host key: /etc/ssh/ssh_host_rsa_key

  @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

  @ WARNING: UNPROTECTED PRIVATE KEY FILE! @

  @@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@

  Permissions 0777 for ‘/etc/ssh/ssh_host_dsa_key’ are too open.

  It is recommended that your private key files are NOT accessible by others.

  This private key will be ignored.

  bad permissions: ignore key: /etc/ssh/ssh_host_dsa_key

  Could not load host key: /etc/ssh/ssh_host_dsa_key

  Disabling protocol version 2. Could not load host key

  sshd: no hostkeys available — exiting.

  [FAILED]

  解決方法:

  #chmod 600 sshd_config ssh_host_dsa_key ssh_host_key ssh_host_rsa_key

  #chmod 620 moduli

  #chmod 644 ssh_config ssh_host_dsa_key.pub ssh_host_key.pub ssh_host_rsa_key.pub

  #service sshd start

  再次出現如下錯誤:

  [root@bailongjun ssh]# service sshd restart

  Stopping sshd: [FAILED]

  Starting sshd: /var/empty/sshd must be owned by root and not group or world-writable.

  [FAILED]

  在終端上直接登錄,問題顯示如下:

  /var/empty/sshd must be owned by root and not group or world-writable.

  問題:

  Linux上的SSH無法啟動

  報告/var/empty/sshd must be owned by root and not group or world-writable.

  解決辦法:

  首先通過物理終端進入到linux上,手工檢查ssh發現沒運行

  -bash-2.05b# /etc/init.d/sshd status

  sshd is stopped

  手工啟動服務,發現報告權限錯誤。

  -bash-2.05b# /etc/init.d/sshd start

  Starting sshd:/var/empty/sshd must be owned by root and not group or world-writable.

  [FAILED]

  -bash-2.05b#

  使用rpm -V 命令可檢查到ssh的軟件包正常,但某個目錄的屬主錯誤。

  -bash-2.05b# rpm -V openssh-server

  S.5….. c /etc/ssh/sshd_config

  …..U.. /var/empty/sshd

  -bash-2.05b#

  經查看發現這個目錄的屬主不是root,所以啟動ssh報錯

  -bash-2.05b# ls -ld /var/empty/sshd/

  d–x–x–x 2 vu00106 root 1024 Feb 2 2005 /var/empty/sshd/

  -bash-2.05b#

  修改為root屬主,啟動成功

  -bash-2.05b# chown root /var/empty/sshd/

  -bash-2.05b# /etc/init.d/sshd start

  Starting sshd: [ OK ]

  -bash-2.05b#

  至此問題修復。

  另外,還可以嘗試:

  這個是權限的問題

  可采取以下兩步解決

  chown -R root.root /var/empty/sshd

  chmod 744 /var/empty/sshd

  service sshd restart

  就可以解決上述的問題。

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