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[Translated] Disable / Password Protect Single User Mode / RHEL / CentOS / 5.x / 6.x
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Translating----------------geekpi
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Disable / Password Protect Single User Mode / RHEL / CentOS / 5.x / 6.x
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================================================================================
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Hello All,
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If you have not protected Single User Mode with Password then it is big risk for your Linux Server, So protecting Single User Mode with Password is very important when it comes to security,
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Today in this article i will show you how you can protect Single User Mode with Password on RHEL / CentOS 5.x and RHEL / CentOS 6.x.
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Please execute given commands carefully else your system will not boot properly. First i would request you to read full procedure and then try to follow. Do it at your own risk :-)
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Password Protect
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### 1. For RHEL / CentOS 5.x ###
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#### 1.1 Before doing anything please take backup of your /etc/inittab ####
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cp /etc/inittab /etc/inittab.backup
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**To Disable and Make Single User Mode Password Protected, Execute below command as root :-**
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[root@tejas-barot-linux ~]$ sed -i '1i su:S:wait:/sbin/sulogin'
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**So It will look like below**
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su:S:wait:/sbin/sulogin
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# Default runlevel. The runlevels used by RHS are:
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# 0 - halt (Do NOT set initdefault to this)
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# 1 - Single user mode
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# 2 - Multiuser, without NFS (The same as 3, if you do not have networking)
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# 3 - Full multiuser mode
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# 4 - unused
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# 5 - X11
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# 6 - reboot (Do NOT set initdefault to this)
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#
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id:3:initdefault:
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*NOTE: If you do not want to use sed command then You can always add “su:S:wait:/sbin/sulogin” at top in /etc/inittab*
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### 2. For RHEL / CentOS 6.x ###
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#### 2.1 Before doing anything please take backup of your /etc/inittab ####
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cp /etc/sysconfig/init /etc/sysconfig/init.backup
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#### 2.2 To Disable and Make Single User Mode Password Protected, Execute below command as root :- ####
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[root@tejas-barot-linux ~]$#sed -i 's/SINGLE=\/sbin\/sushell/SINGLE=\/sbin\/sulogin/' /etc/sysconfig/init
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**So It will look like below**
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SINGLE=/sbin/sulogin
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*NOTE :- If you do not want to use sed command then You can always change to “SINGLE=/sbin/sulogin” in /etc/sysconfig/init*
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Enjoy Linux :) Enjoy Open Source
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--------------------------------------------------------------------------------
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via: http://www.tejasbarot.com/2014/05/05/disable-password-protect-single-user-mode-rhel-centos-5-x-6-x/#axzz39oGCBRuX
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作者：[Tejas Barot][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:https://plus.google.com/+TejasBarot
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@ -0,0 +1,68 @@
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在RHEL / CentOS / 5.x / 6.x上禁用并使单用户模式受到密码保护
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================================================================================
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大家好,
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如果您还没有使用密码保护单用户模式，这对你的Linux服务器会是一个很大的风险，所以在涉及到安全性时，使用密码保护单用户模式是非常重要的。
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今天这篇文章我会向你展示如何在RHEL / CentOS 5.x 和 RHEL / CentOS 6.x上使用密码保护你的单用户模式。
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请仔细地执行所给出的命令，不然你的系统将会无法正常启动。首先，我会请你先完整地读完，然后在尝试。请自己承担相应的后果:-)
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Password Protect
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### 1. 对于 RHEL / CentOS 5.x ###
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#### 1.1 开始之前请先备份你的 /etc/inittab ####
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cp /etc/inittab /etc/inittab.backup
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** 禁用并使单用户模式受到密码保护，用root执行下面的命令 :-**
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[root@tejas-barot-linux ~]$ sed -i '1i su:S:wait:/sbin/sulogin'
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** 这样你会看到像下面这样的 **
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su:S:wait:/sbin/sulogin
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# Default runlevel. The runlevels used by RHS are:
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# 0 - halt (Do NOT set initdefault to this)
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# 1 - Single user mode
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# 2 - Multiuser, without NFS (The same as 3, if you do not have networking)
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# 3 - Full multiuser mode
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# 4 - unused
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# 5 - X11
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# 6 - reboot (Do NOT set initdefault to this)
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#
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id:3:initdefault:
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*NOTE: 如果你不想使用sed命令你可以在/etc/inittab 顶部加入 “su:S:wait:/sbin/sulogin” *
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### 2. 对于 RHEL / CentOS 6.x ###
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#### 2.1 开始之前请先备份你的 /etc/inittab####
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cp /etc/sysconfig/init /etc/sysconfig/init.backup
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#### 2.2 禁用并使单用户模式受到密码保护，用root执行下面的命令 :- ####
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[root@tejas-barot-linux ~]$#sed -i 's/SINGLE=\/sbin\/sushell/SINGLE=\/sbin\/sulogin/' /etc/sysconfig/init
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**这样你会看到像下面这样的**
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SINGLE=/sbin/sulogin
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*注意 :- 如果你不想使用sed你可以在 /etc/sysconfig/init 中直接改成 “SINGLE=/sbin/sulogin”*
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E享受Linux :) 享受开源
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--------------------------------------------------------------------------------
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via: http://www.tejasbarot.com/2014/05/05/disable-password-protect-single-user-mode-rhel-centos-5-x-6-x/#axzz39oGCBRuX
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作者：[Tejas Barot][a]
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创翻译，[Linux中国](http://linux.cn/) 荣誉推出
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[a]:https://plus.google.com/+TejasBarot
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