SSH启动失败解决方法

04-03

VPS是3个人合租共用的,不知道谁操作了什么导致SSH启动失败,一直连接不上刚开始以为系统坏了呢,后面通过VPS终端登陆上去发现SSH服务没在运行,于是尝试运行SSHD发现出现如下错误:

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]

解决方法:

#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

再次出现如下错误:

[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]

在终端上直接登录,问题显示如下:

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

问题:

Linux上的SSH无法启动

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

解决办法:

首先通过物理终端进入到linux上,手工检查ssh发现没运行

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

sshd is stopped

手工启动服务,发现报告权限错误。

-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 命令可检查到ssh的软件包正常,但某个目录的属主错误。

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

S.5….. c /etc/ssh/sshd_config

…..U.. /var/empty/sshd

-bash-2.05b#

经查看发现这个目录的属主不是root,所以启动ssh报错

-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#

修改为root属主,启动成功

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

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

Starting sshd: [ OK ]

-bash-2.05b#

至此问题修复。

另外,还可以尝试:

这个是权限的问题

可采取以下两步解决

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

chmod 744 /var/empty/sshd

service sshd restart

就可以解决上述的问题。