Recovering my GNU/Linux system

I have made some modifications to my RHEL/Fedora/CentOS, Debian/Ubuntu operating system and now it does not restart. How can I make a recovery / rescue operation?

There are 2 ways to make a rescue system operation: the first is using the rescue cd or live cd distribution you are using, you can also use Knoppix or Puppy Linux; the second, which we will discuss in this post, is passing to the kernel from GRUB, then runlevel which the operating system should be started. To do this:

Restart the computer

Press Esc to enter GRUB

After having entered GRUB, press: a

For RHEL/CentOS add: init 1

For Fedora add only: 1

In Ubuntu you must select the version of the kernel: recovery mode

From there the system starts in mode text, single-user and no start network services, neither web server, mail, DNS, etc., mounted existing partitions existing to create an environment to carry out rescue operations

Make changes to the configuration of the system


Recommended reading

Official site of the GRUB project

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