Difference between revisions of "Root Password Reset"

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m (Srn moved page Password Reset to Root Password Reset: Password reset could refer to other systems)
 
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The prgmr.com rescue image can be used to reset the root password for the vps similar to a rescue disk like tomsrtbt or the debian installer rescue mode. If you run netbsd, you can also boot the netbsd installer from the rescue disk for a similar process.  
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The prgmr.com rescue image can be used to reset the root password for your VPS just as you might use a live CD. If you run BSD, you can also boot the appropriate BSD installer and follow a similar process.  
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 +
=Boot Into Rescue Mode=
 +
Shut down your VPS and boot into the rescue mode using the [[Management Console]]:
  
<ol>
 
<li>If the vps (domain) is still running, shut it down using the [[Management Console]].
 
 
<pre>
 
<pre>
Name                                        ID  Mem VCPUs State Time(s)
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Options:
cnrylefanu                                159  256    1    -b----    131.6
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1. out of band console (press ctrl-] to escape, not resizeable)
 +
2. create/start, opens OOB console (try this if the machine is not running)
 +
3. shutdown (requests clean shutdown, forces off after 4 min)
 +
4. force power off (destroy/hard shutdown)
 +
5. reboot (shutdown + start)
 +
6. set bootloader, rescue mode, or netboot installer
 +
7. view/add/remove ssh authorized_keys
 +
8. view/edit reverse dns
 +
9. install new OS image
 +
a. system details
 +
b. maintenance options
 +
</pre>
  
    Wiki at http://wiki.prgmr.com
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<li>Select "system details" and note what "Boot option:" says. Normally this will be set to "Disk".</li>
    Please contact support@prgmr.com with any issues accessing your machine.
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<li>Select "shutdown" to shut down your VPS.</li>
  
    Options for "cnrylefanu"
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When the system shuts down and returns to the console, use option "set bootloader, rescue mode, or netboot installer" and proceed from there. Depending on your VPS type, you will be presented with one of two menus:
    1. out of band console (press ctrl-] to escape, not resizeable)
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    2. create/start, opens OOB console (try this if the machine is not running)
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<pre>
    3. shutdown (requests operating system to shut down)
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Options:
    4. force power off (destroy/hard shutdown)
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1. Boot from disk
    5. reboot (requests operating system to reboot)
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2. Linux-based Live Rescue
    6. swap i386/amd64 bootloaders currently "amd64"
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3. Linux netboot installers - install mode
    7. view/add/remove ssh authorized_keys
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4. Linux netboot installers - rescue mode
    8. set reverse dns
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5. BSD installers
    9. swap pvgrub/grub2 bootloaders currently "pv-grub"
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</pre>
  
    0. exit
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or
    enter selection> 3
 
  
</pre> This will signal the domain to shut down safely.</li>
 
<li>When the machine is stopped, the Management Console menu will return. Pressing Enter will generate a new menu with a different heading:
 
 
<pre>
 
<pre>
Error: Domain 'build' does not exist.
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Options:
</pre> which is normal, it just means the vps isn't running. Choose create/start to start the vps:
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1. GRUB legacy(pv-grub)
<pre>
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2. GRUB2
Domain cnrylefanu is not running.
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3. Linux-based Live Rescue
 +
4. Linux netboot installers - install mode
 +
5. Linux netboot installers - rescue mode
 +
6. BSD netboot installers
 +
</pre>
  
    Wiki at http://wiki.prgmr.com
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<li>Select Linux-based Live Rescue if you run Linux, otherwise choose the appropriate BSD installer.</li>
    Please contact support@prgmr.com with any issues accessing your machine.
 
  
    Options for "cnrylefanu"
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<li>Go back to the main menu and select "create/start".</li>
    1. out of band console (press ctrl-] to escape, not resizeable)
 
    2. create/start, opens OOB console (try this if the machine is not running)
 
    3. shutdown (requests operating system to shut down)
 
    4. force power off (destroy/hard shutdown)
 
    5. reboot (requests operating system to reboot)
 
    6. swap i386/amd64 bootloaders currently "amd64"
 
    7. view/add/remove ssh authorized_keys
 
    8. set reverse dns
 
    9. swap pvgrub/grub2 bootloaders currently "pv-grub"
 
    0. exit
 
    enter selection> 2   
 
</pre>
 
The domain will start booting with pvgrub and will load the grub menu from the rescue image:
 
<pre>
 
    GNU GRUB  version 0.97  (262144K lower / 0K upper memory)
 
  
+-------------------------------------------------------------------------+
+
==Reset Your Password==
| user bootloader configuration                                          | 
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<ol>
| Debian GNU/Linux, kernel 3.16.0-4-amd64 Live Rescue                    |
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<li>When the rescue image is finished booting, log in as root at the prompt with no password (this example uses the Linux-based Live Rescue):</li>
| Debian GNU/Linux, kernel 3.16.0-4-amd64 (single-user mode) Live Rescu>  |
 
| centos5-64 rescue                                                      |
 
| centos5-64 install                                                      |
 
| centos6-64 rescue                                                      |
 
| centos6-64 install                                                      |
 
| centos7-64 rescue                                                      |
 
| centos7-64 install                                                      |
 
| debian-jessie-8.0-64 rescue                                            |
 
| debian-jessie-8.0-64 install                                            |
 
| debian-wheezy-7.0-64 rescue                                            | v
 
+-------------------------------------------------------------------------+
 
    Use the ^ and v keys to select which entry is highlighted.
 
    Press enter to boot the selected OS, 'e' to edit the
 
    commands before booting, or 'c' for a command-line.
 
</pre></li>
 
<li>Choose Debian GNU/Linux Live Rescue to boot the read only rescue image. When it is finished booting, login as root at the prompt with no password:
 
 
<pre>
 
<pre>
Debian GNU/Linux 8 rescue hvc0
 
 
 
rescue login: root
 
rescue login: root
Linux rescue 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt20-1+deb8u3 (2016-01-17) x86_64
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Linux rescue 4.9.0-12-amd64 #1 SMP Debian 4.9.210-1 (2020-01-20) x86_64
Documentation on installing a new image is at
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To manually enable ssh access to the rescue image, copy
http://wiki.prgmr.com/mediawiki/index.php/Untarring_a_fresh_OS_image
 
 
 
To enable ssh access to the rescue image, copy
 
 
your public key to /root/.ssh/authorized_keys and type
 
your public key to /root/.ssh/authorized_keys and type
 
"service ssh start"
 
"service ssh start"
 
root@rescue:~#  
 
root@rescue:~#  
</pre></li>
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</pre>
<li>Mount your root filesystem (by default /dev/xvda1) and chroot to it:
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<li>Mount your root filesystem (by default /dev/xvda1) and chroot to it:</li>
 
<pre>
 
<pre>
root@rescue:~# mount /dev/xvda1 /mnt
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root@rescue:~# mount /dev/xvda1 /mnt/
[ 330.620031] EXT4-fs (xvda1): mounting ext3 file system using the ext4 subsystem
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[   60.024137] EXT4-fs (xvda1): mounted filesystem with ordered data mode. Opts: (null)
[  330.689992] EXT4-fs (xvda1): mounted filesystem with ordered data mode. Opts: (null)
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root@rescue:~# chroot /mnt/
root@rescue:~# chroot /mnt
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</pre>
[root@rescue /]#
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<li>Change the root password with passwd:</li>
</pre></li>
 
<li>Change the root password with passwd:
 
 
<pre>
 
<pre>
[root@rescue /]# passwd
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root@rescue:/# passwd
 
Enter new UNIX password:  
 
Enter new UNIX password:  
 
Retype new UNIX password:  
 
Retype new UNIX password:  
 
passwd: password updated successfully
 
passwd: password updated successfully
[root@rescue /]#  
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</pre>
</pre></li>
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<li>Exit, unmount, and shutdown:
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<li>If you are using CentOS or Fedora, mark the file system for [https://wiki.centos.org/HowTos/SELinux#Relabel_Complete_Filesystem selinux autorelabeling]:</li>
 +
<pre>
 +
root@rescue:/# touch /.autorelabel
 +
</pre>
 +
 
 +
<li>Exit, unmount, and shutdown:</li>
 
<pre>
 
<pre>
 
[root@rescue /]# exit
 
[root@rescue /]# exit
Line 108: Line 87:
 
         Starting Synchronise Hardware Clock to System Clock...
 
         Starting Synchronise Hardware Clock to System Clock...
 
</pre>
 
</pre>
</li>
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<li>This will return you to the Management Console. You need to set the system to boot normally again. Go to the "set bootloader, rescue mode, or netboot installer" menu and select your original boot option.</li>
<li>This will return you to the Management Console. Start the domain again as in step 2, but let it load the "user bootloader configuration" instead of choosing the rescue image.</li>
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<li>Go back to the main menu.</li>
 +
<li>Start the VPS again using "create/start."</li>
 
</ol>
 
</ol>
 
{{c|for Users}}
 
{{c|for Users}}
 
{{c|Prgmr}}
 
{{c|Prgmr}}

Latest revision as of 19:01, 19 May 2020

The prgmr.com rescue image can be used to reset the root password for your VPS just as you might use a live CD. If you run BSD, you can also boot the appropriate BSD installer and follow a similar process.

Boot Into Rescue Mode

Shut down your VPS and boot into the rescue mode using the Management Console:

Options:
1. out of band console (press ctrl-] to escape, not resizeable)
2. create/start, opens OOB console (try this if the machine is not running)
3. shutdown (requests clean shutdown, forces off after 4 min)
4. force power off (destroy/hard shutdown)
5. reboot (shutdown + start)
6. set bootloader, rescue mode, or netboot installer
7. view/add/remove ssh authorized_keys
8. view/edit reverse dns
9. install new OS image
a. system details
b. maintenance options
  • Select "system details" and note what "Boot option:" says. Normally this will be set to "Disk".
  • Select "shutdown" to shut down your VPS.
  • When the system shuts down and returns to the console, use option "set bootloader, rescue mode, or netboot installer" and proceed from there. Depending on your VPS type, you will be presented with one of two menus:

    Options:
    1. Boot from disk
    2. Linux-based Live Rescue
    3. Linux netboot installers - install mode
    4. Linux netboot installers - rescue mode
    5. BSD installers
    

    or

    Options:
    1. GRUB legacy(pv-grub)
    2. GRUB2
    3. Linux-based Live Rescue
    4. Linux netboot installers - install mode
    5. Linux netboot installers - rescue mode
    6. BSD netboot installers
    
  • Select Linux-based Live Rescue if you run Linux, otherwise choose the appropriate BSD installer.
  • Go back to the main menu and select "create/start".
  • Reset Your Password

    1. When the rescue image is finished booting, log in as root at the prompt with no password (this example uses the Linux-based Live Rescue):
    2. rescue login: root
      Linux rescue 4.9.0-12-amd64 #1 SMP Debian 4.9.210-1 (2020-01-20) x86_64
      To manually enable ssh access to the rescue image, copy
      your public key to /root/.ssh/authorized_keys and type
      "service ssh start"
      root@rescue:~# 
      
    3. Mount your root filesystem (by default /dev/xvda1) and chroot to it:
    4. root@rescue:~# mount /dev/xvda1 /mnt/
      [   60.024137] EXT4-fs (xvda1): mounted filesystem with ordered data mode. Opts: (null)
      root@rescue:~# chroot /mnt/
      
    5. Change the root password with passwd:
    6. root@rescue:/# passwd
      Enter new UNIX password: 
      Retype new UNIX password: 
      passwd: password updated successfully
      
    7. If you are using CentOS or Fedora, mark the file system for selinux autorelabeling:
    8. root@rescue:/# touch /.autorelabel
      
    9. Exit, unmount, and shutdown:
    10. [root@rescue /]# exit
      exit
      root@rescue:~# umount /mnt
      root@rescue:~# shutdown -h now
               Starting Synchronise Hardware Clock to System Clock...
      
    11. This will return you to the Management Console. You need to set the system to boot normally again. Go to the "set bootloader, rescue mode, or netboot installer" menu and select your original boot option.
    12. Go back to the main menu.
    13. Start the VPS again using "create/start."