CentOS Learning Handbook--Forced password reset

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CentOS Learning Manual by Ruffianfish; Ruffian Fish

Recently idle boring, and recently in the CentOS decided to write a detailed study manual centos, so that they do not touch CentOS for a long time can see again. and very suitable for beginners to learn, because the following important information are translated in Chinese.

Note: Fish represents the meaning of the example

A CentOS server password forgot what to do!

The way CentOS and Red Hat Linux I contacted previously was a urine-like one, forcing the root password to be reset.

Fish:

1. Start the CentOS

Figure 1.1.1

Interface meaning:

Press any key to enter the menu: Pressing any key to enter the menus

Booting CentOS in 3 seconds ...: 3 seconds to start (boot) CentOS

2. Press and hold any key to enter the following screen

Figure 1.2.1

Interface meaning:

' E ' edit the commands before booting editing commands before booting

' A ' modify the kernel arguments before booting: Modify kernel parameters before booting

' C ' for a command-line: go to the command line

Here, press E to enter the edit command.

3. Press ' E ' to enter the following

Figure 1.3.1

GNU GRUB vession 0.97

This is a GNU Project multi-operating system launcher, version number 0.97 here does not introduce

Root (hd0,0)

(hd0,0) is the first primary partition on the first external memory (limited to a device that is recognized as HD).

Second line

Refers to the kernel file, where we are going to enter the kernel file

Third line

Refers to the image file, a Linux system boot sequence is generally, the first kernel post-image.

Below we select the second line, press and hold the ' E ' key as follows:

4. Press ' E ' to enter the following

Figure 1.4.1

Here we press a space key after the quit to enter ' single ', boot the one-user Linux mode, then enter the interface again:

Figure 1.4.2

Still select the second item, press ' B ' key to start the system

5. System boot into an all-English interface, as follows

Figure 1.5.1

We enter: passwd root: Reset password using root

Figure 1.5.2

I this hint password is too simple, can not ignore, re-enter the password

Figure 1.5.3

Here: All authentication token updates are successful, the password update succeeds, and then we enter: Reboot reboot the system.

After the system restarts, enter the user of the pipe: root, Password: * * *, you can enter the system.

Figure 1.5.4

Here is a graphical form of the interface, I am a like to pretend to force the person, do not install force how to do it, we can easily change to the command line interface.

First step: Right-click to open Terminal.

Step two: CD/go to the root directory

Step three: CD etc into the System configuration folder

Fourth: VI Inittab is the VI editor, modify the boot level

As follows:

Figure 1.5.5

Figure 1.5.6

0 Turn off the machine

1 Single-User mode

2 Multi-user mode without network

3 multi-user with network, so-called pure character mode

4 reserved, user can define self-sufficiency

5 graphical interface for multi-user mode

6 Re-start system

Id:5:initdefault: Change to Id:3:initdefault:

: Wq Save

Here vi Editor how to use the first good introduction, the next chapter to do the introduction.

: Reboot restart

Figure 1.5.7

The system starts to enter the user name password, you can see to install the force of the interface.

First line: Version number

Second line: Kernel

End of Chapter I.

By won't knock code programmer Ruffian Fish

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CentOS Learning Handbook--Forced password reset