Uncover the mysteries of Linux

With the development of the times, many new things also become popular. Although Linux is not a new thing, it has recently been sought after by a large number of people. What is the uniqueness of the Linux system's mysteries, what is its charm? Today, we will discuss the mysteries of the Linux system.

When the computer is able to boot but cannot enter the option screen, if you can try to use the previously backed up Linux boot CD to enter the operating system, and then check whether it is caused by the failure of GRUB, it will be much more convenient. To create a boot disc in Linux, you should first use the boot disc. img, bootnet. img or pcmcia. img and other boot disc image files, create boot disk, and then boot through the disk. To be honest, this method is not practical for the current operating system, mainly for the following reasons:

After Linux is installed, most people will not actually make a boot disc to ensure it will be used when there is a problem with the boot program in the future. This requires careful personnel to do it. The rescue mode described below is very convenient and can be done with only one disc. Therefore, this practice is becoming increasingly rare (I am too careless, so I am not used to it ).

Another bigger problem is that most of the kernel size of the user's installed operating system is larger than 1.44 MB (some blame users for having too many devices or chipsets on their computers ), this means that if you want to boot the disk ...... No! When creating a boot disc, in addition to putting the kernel into the disk, there is also an initrd file to be put in, so with the limited size of the disk, unless you re-compile the kernel on your own, there is no other way, and this is even worse for general users.

If the disk is not seen or damp, you must redo it again. However, users usually cannot find this problem because the computer cannot start up, then we can see that it is gone.

Now the Linux version is actually already installed on the CD (it can be used directly if it is a DVD) put the kernel and related modules (that is, the drivers required by common hardware) for the user to boot, and use the CD to boot, you can save a lot of problems caused by compatibility, for example, the NIC or scsicard required for starting the instance.

In addition, you do not need to prepare a dedicated disk or CD for boot. As long as you can find a CD or DVD for Linux installation, you can use the CD to enter the Linux rescue mode, this method is more secure than the Windows protection mode, because it is not started by the original operating system. As for how to enter the Linux rescue mode, red Hat relies on the anaconda program for help.

Anaconda is the installation and management software provided by Red Hat in Fedora and RHEL (Red Hat Enterprise Linux) versions. In short, it is the software that provides interfaces for users to install, anaconda supports the Rescue Mode in the installation Mode option, which can help you manually restore or repair the Red Hat operating system that cannot be started on. The SuSE operating system also provides similar functions. The process and interface are not the same, but basically the method and result are similar. Here we use Fedora Core 7 as an example.

The steps for using the rescue mode are after the "boot:" parameter on the installation screen is set before Fedora Core 6, and then enter "linux rescue". But this is changed in Feodra Core 7, the Rescue Mode option is provided directly in the form of graphical interfaces, allowing users to access directly. This option indicates that anaconda should be notified when installation starts, and the rescue mode should be entered during startup, rather than the installation mode.

After reading this article, I hope this article will reveal the mysteries of Linux.

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