https://dikapediav2.com/wiki/index.php?action=history&feed=atom&title=Chroot 2026-05-15T09:11:13Z Revision history for this page on the wiki MediaWiki 1.41.0 https://dikapediav2.com/wiki/index.php?title=Chroot&diff=40&oldid=prev 2024-08-21T14:43:04Z

<p>Created page with &quot;* Very important to bind /dev since the passwd command makes use of /dev/random which needs to actually exist Robert&#039;s way (This example shows how to change a password while chrooted): (all sudo) mount /dev/xvdf1 /mnt mount -o bind /proc /mnt/proc mount -o bind /sys /mnt/sys mount -o bind /dev /mnt/dev mount -o bind /run /mnt/run #This one was recommended but I didn&#039;t end up using it chroot /mnt passwd [username] exit umount /mnt/{dev,sys,proc} umo...&quot;</p> <p><b>New page</b></p><div>* Very important to bind /dev since the passwd command makes use of /dev/random which needs to actually exist<br /> <br /> Robert&#039;s way (This example shows how to change a password while chrooted):<br /> (all sudo) <br /> <br /> mount /dev/xvdf1 /mnt<br /> mount -o bind /proc /mnt/proc<br /> mount -o bind /sys /mnt/sys<br /> mount -o bind /dev /mnt/dev<br /> mount -o bind /run /mnt/run #This one was recommended but I didn&#039;t end up using it<br /> <br /> chroot /mnt<br /> <br /> passwd [username]<br /> exit<br /> <br /> umount /mnt/{dev,sys,proc}<br /> umount /mnt<br /> <br /> <br /> <br /> Other way:<br /> $ mount /dev/xvdf1 /mnt<br /> $ for i in dev proc sys run; do mount -o bind /$i /mnt/$i; done<br /> $ chroot /mnt<br /> $ for i in dev proc sys run; do sudo umount /mnt/$i; done<br /> <br /> <br /> Neshons way:<br /> $ cd /tmp/rescueroot<br /> $ sudo mount -t proc /proc proc/<br /> $ sudo mount --rbind /sys sys/<br /> $ sudo mount --rbind /dev dev/<br /> $ sudo mount --rbind /run run/<br /> $ sudo chroot /tmp/rescueroot #This one was recommended but I didn&#039;t end up using it<br /> <br /> <br /> ====Resetting Root Password====<br /> ----<br /> You will have to reset the password manually by interrupting grub by using the kernel parameter &lt;b&gt;rd.break&lt;/b&gt;.<br /> <br /> 1. Boot the system and interrupt the booting process when you&#039;re at the GRUB menu by pressing &#039;e&#039;.&lt;/br&gt;<br /> 2. Add the kernel parameter &lt;b&gt;rd.break&lt;/b&gt; to the Linux kernel line.&lt;/br&gt;<br /> 3. Press &#039;ctrl+x&#039; to boot.&lt;/br&gt;<br /> 4. You will enter the emergency mode prompt (or preboot screen, per Joe) to authenticate to unlock the drive.&lt;/br&gt;<br /> 5. Then run the following commands:<br /> # mount -o remount,rw /sysroot<br /> # chroot /sysroot<br /> # passwd <br /> # touch /.autorelabel<br /> # exit<br /> # logout<br /> 6. A couple of minutes and once done, the system will reboot upon which you can log in as the root user with the new password.&lt;/br&gt;<br /> <br /> Notes:<br /> * The rd.break parameter interrupts the boot process before the control is passed over to the kernel. At this point, when you run the passwd command to do the password reset, the associated shadow file (&lt;b&gt;/etc/shadow&lt;/b&gt;) is modified with an incorrect SELinux context. The touch &lt;b&gt;/.autorelabel&lt;/b&gt; command creates a hidden file named &lt;b&gt;.autorelabel&lt;/b&gt; under the root directory. On the next boot, the SELinux subsystem will detect this file, and then relabel all of the files on that system with the correct SELinux contexts. On large disks, this process can take a good amount of time.<br /> <br /> Reference: &lt;/br&gt;<br /> [+] https://www.tecmint.com/reset-forgotten-root-password-in-rhel-8/ &lt;/br&gt;<br /> [+] https://learn.redhat.com/t5/Platform-Linux/Unable-to-reset-the-root-password-when-disabling-SELinux/td-p/21082&lt;/br&gt;<br /> [+] https://unix.stackexchange.com/questions/509798/what-does-touch-autorelabel-do-when-we-reset-the-root-password-in-red-hat-en/509801#509801&lt;/br&gt;</div>

Ardika Sulistija