Two problems related to system startup and normal operation of X

Article Title: two questions about system startup and normal operation of X. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. Q:

1. system startup sequence: 1. BIOS ---> 2. MBR ---> 3. BOOTLOADER ----> 4. KERNEL -----> 5. INITTAB -----> 6. RC. SYSINIT. the problem is that after the kernel is started in step 1, mount the root file system and execute init fail, which may cause errors or loss of those files.

2. What are the situations where X Windows cannot work normally ??

A:

1. when the bootloader mounts the kernel, it will mount the/file system, rc. when sysinit is executed, it will mount a/file system. The first time it is read-only, and the second time it is mounted according to the rules of the/etc/fstab file, only these two locations are mounted to the/File System at startup!

At startup, the kernel starts and configures the init process according to the/etc/inittab file. in RedHat,/etc/rc is called. d/rc scripts are used to determine how to start the runlevel during startup. Usually, init =? And so on. This depends on experience!

2. There are many reasons why X cannot be started. Currently, this is common:

(1) No X or any WM (window master) is installed)

(2) xfs font server not enabled

(3) The WM is not selected correctly.

(4) The/etc/X11/XF86Config is not correctly configured.

(5)/tmp directory or ~ The directory does not have enough space to write X temporary files.