VPS是3個(gè)人合租共用的，不知道誰操作了什么導(dǎo)致SSH啟動失敗，一直連接不上剛開始以為系統(tǒng)壞了呢，后面通過VPS終端登陸上去發(fā)現(xiàn)SSH服務(wù)沒在運(yùn)行，于是嘗試運(yùn)行SSHD發(fā)現(xiàn)出現(xiàn)如下錯(cuò)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(xiàn)如下錯(cuò)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(bào)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(jìn)入到linux上，手工檢查ssh發(fā)現(xiàn)沒運(yùn)行
-bash-2.05b# /etc/init.d/sshd status
sshd is stopped
手工啟動服務(wù)，發(fā)現(xiàn)報(bào)告權(quán)限錯(cuò)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(gè)目錄的屬主錯(cuò)誤。
-bash-2.05b# rpm -V openssh-server
S.5….. c /etc/ssh/sshd_config
…..U.. /var/empty/sshd
-bash-2.05b#
經(jīng)查看發(fā)現(xiàn)這個(gè)目錄的屬主不是root，所以啟動ssh報(bào)錯(cuò)
-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(fù)。
另外，還可以嘗試：
這個(gè)是權(quán)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。