1. Edit the kernel boot parameters by pressing e
2. Go to the end of the 3linux3 line by pressing Ctrl+e, removing ro crash and add rd.break enforcing=0
3. Start the system by pressing Ctrl+x
4. Remount the root of the system:
   mount -o remount,rw /sysroot
5. Switch to /sysroot:
   chroot /sysroot
6. Reset the root password
7. Enable SELinux relabeling:
   touch /.autorelabel
8. Exit the shell

il y a une différence importante entre Grub et Grub2 dans la numérotation des partitions :

Sur Grub, la numérotation démarre à 0 pour les disques physiques ET pour les partitions. Exemple : /dev/hda1 ou /dev/sda1 sera nommé hd(0,0) par grub.

Sur Grub2, elle démarre à 0 pour les disques physiques et à 1 pour le numéro de la partition. Exemple : /dev/hda1 ou /dev/sda1 sera nommé hd(0,1) par grub-pc.

GRUB 2 (version Compatibles PC)

cf.http://thread.gmane.org/gmane.linux.redhat.rhn.satellite.user/216

cf. Failed to download metadata for repo ‘AppStream’ [CentOS]

• https://www.shellcheck.net/, finds bugs in your shell scripts
• https://www.shellscript.sh/, The Shell Scripting Tutorial
• https://www.davidpashley.com/articles/writing-robust-shell-scripts/, Writing Robust Bash Shell Scripts
• http://www.yoone.eu/articles/2-good-practices-for-writing-shell-scripts.html, Good practices for writing shell scripts
  https://www.cyberciti.biz/faq/unix-linux-bash-find-out-the-exit-codes-of-all-piped-commands/, Bash Find out the exit codes of all piped commands

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