Linux Rescue mode operation

Operating tool: Vmware,centos 6.6

Reboot into the BIOS to switch to CD-ROM boot (in the virtual machine, enter the BIOS press F2, also can be selected directly in the Power options)
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Install or upgrade an existing system (install or upgrade an existing system): This option is default.
Install the system, basic video driver (Install systems with basic videos driver): This option allows you to install the CentOS mode. If there is a distortion or a blank space on your screen when you use the option to install or upgrade an existing system, restart your computer and try this option.
Rescue Installation Systems (Rescue installed system): Select this option to repair your CentOS system installation to prevent normal startup problems.
Boot from local drive (boot frome local drives): This option will boot the disk system from the first installation.

Select ' Rescue installed system ' to enter rescue mode
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language default, keyboard type default, Rescue Method also remains the default, whether to configure the network card, this according to the actual situation, generally do not need  
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Note: Remember the command, that is, chroot/mnt/sysimage
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There are three modes to choose, Shell mode directly into the command line;
FAKD diagnostic mode;
Reboot direct restart;
Select the first shell mode
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/mnt/sysimage inside is a "pseudo system" that contains the files and directories of the system root

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execute a command: chroot/mnt/sysimage, modify the root directory with the chroot command
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/mnt/sysimage will disappear after modification
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Reboot the system at this time, but must be returned to rescue mode to reboot
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Select line fourth to start, you can enter the system normally

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Linux Rescue mode operation