Difference between revisions of "Root Password Reset"

From PrgmrWiki
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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.  
 
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.  
 +
 +
==Set Up Your VPS==
  
 
To access the live rescue image more easily, verify that you are using "pv-grub", using the [[Management Console]]. Check option 9.
 
To access the live rescue image more easily, verify that you are using "pv-grub", using the [[Management Console]]. Check option 9.
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and switch if desired.<br>
 
and switch if desired.<br>
  
<ol>
+
==Reset Your Password==
<li>If the vps (domain) is still running, enter option 3 to shut it down safely.</li>
+
# If the vps (domain) is still running, enter option 3 to shut it down safely.<p>When the machine is stopped, the Management Console menu will return. Pressing Enter will generate a new menu with a different heading:
<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>
 
Domain 'cnryfield' is not running.
 
Domain 'cnryfield' is not running.
</pre> which is normal, it just means the vps isn't running. Choose option 2 (create/start) to start the vps:
+
</pre></p>
 
+
# Choose option 2 (create/start) to start the vps.<p>The domain will start booting with pvgrub and will load the grub menu from the rescue image:
The domain will start booting with pvgrub and will load the grub menu from the rescue image:
 
 
<pre>
 
<pre>
 
GNU GRUB  version 0.97  (131072K lower / 0K upper memory)
 
GNU GRUB  version 0.97  (131072K lower / 0K upper memory)
Line 59: Line 59:
 
     Press enter to boot the selected OS, 'e' to edit the
 
     Press enter to boot the selected OS, 'e' to edit the
 
     commands before booting, or 'c' for a command-line.
 
     commands before booting, or 'c' for a command-line.
</pre></li>
+
</pre></p>
<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:
+
# Choose Debian GNU/Linux Live Rescue to boot the read only rescue image. When it is finished booting, log in as root at the prompt with no password:
 
<pre>
 
<pre>
 
Debian GNU/Linux 8 rescue hvc0
 
Debian GNU/Linux 8 rescue hvc0
Line 73: Line 73:
 
"service ssh start"
 
"service ssh start"
 
root@rescue:~#  
 
root@rescue:~#  
</pre></li>
+
</pre>
<li>Mount your root filesystem (by default /dev/xvda1) and chroot to it:
+
# Mount your root filesystem (by default /dev/xvda1) and chroot to it:
 
<pre>
 
<pre>
 
root@rescue:~# mount /dev/xvda1 /mnt
 
root@rescue:~# mount /dev/xvda1 /mnt
Line 81: Line 81:
 
root@rescue:~# chroot /mnt
 
root@rescue:~# chroot /mnt
 
[root@rescue /]#  
 
[root@rescue /]#  
</pre></li>
+
</pre>
<li>Change the root password with passwd:
+
# Change the root password with passwd:
 
<pre>
 
<pre>
 
[root@rescue /]# passwd
 
[root@rescue /]# passwd
Line 98: Line 98:
 
         Starting Synchronise Hardware Clock to System Clock...
 
         Starting Synchronise Hardware Clock to System Clock...
 
</pre>
 
</pre>
</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>
<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>
 
</ol>
 
 
{{c|for Users}}
 
{{c|for Users}}
 
{{c|Prgmr}}
 
{{c|Prgmr}}

Revision as of 22:24, 2 July 2016

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.

Set Up Your VPS

To access the live rescue image more easily, verify that you are using "pv-grub", using the Management Console. Check option 9.

Name                                        ID   Mem VCPUs	State	Time(s)
cnryfield                                  218  1024     1     r-----    1898.8

    Wiki at http://wiki.prgmr.com
    Please contact support@prgmr.com with any issues accessing your machine.

    Options for "cnryfield"
    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 "i386"
    7. view/add/remove ssh authorized_keys
    8. set reverse dns
    9. swap pvgrub/grub2 bootloaders currently "pv-grub"

    0. exit
    enter selection> 

If the current bootloader is grub2, press 9 to switch to pv-grub.

Check whether you are running in 32 bit (i386) or 64 bit (amd64) mode by looking at option 6:

6. swap i386/amd64 bootloaders currently "i386"

and switch if desired.

Reset Your Password

  1. If the vps (domain) is still running, enter option 3 to shut it down safely.

    When the machine is stopped, the Management Console menu will return. Pressing Enter will generate a new menu with a different heading:

Domain 'cnryfield' is not running.

  1. Choose option 2 (create/start) to start the vps.

    The domain will start booting with pvgrub and will load the grub menu from the rescue image:

GNU GRUB  version 0.97  (131072K lower / 0K upper memory)

 +-------------------------------------------------------------------------+
 | user bootloader configuration                                           |  
 | Debian GNU/Linux, kernel 3.2.0-4-amd64 Live Rescue                      |
 | Debian GNU/Linux, kernel 3.2.0-4-amd64 (single-user mode) Live Rescue   |
 | ubuntu-trusty-14.04-64 rescue                                           |
 | ubuntu-trusty-14.04-64 install                                          |
 | centos5-64 rescue                                                       |
 | centos5-64 install                                                      |
 | debian-wheezy-7.0-64 rescue                                             |
 | debian-wheezy-7.0-64 install                                            |
 | fedora20-64 rescue                                                      |
 | fedora20-64 install                                                     |
 | centos6-64 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.

  1. Choose Debian GNU/Linux Live Rescue to boot the read only rescue image. When it is finished booting, log in as root at the prompt with no password:
Debian GNU/Linux 8 rescue hvc0

rescue login: root
Linux rescue 3.16.0-4-amd64 #1 SMP Debian 3.16.7-ckt20-1+deb8u3 (2016-01-17) x86_64
Documentation on installing a new image is at 
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
"service ssh start"
root@rescue:~# 
  1. Mount your root filesystem (by default /dev/xvda1) and chroot to it:
root@rescue:~# mount /dev/xvda1 /mnt
[  330.620031] EXT4-fs (xvda1): mounting ext3 file system using the ext4 subsystem
[  330.689992] EXT4-fs (xvda1): mounted filesystem with ordered data mode. Opts: (null)
root@rescue:~# chroot /mnt
[root@rescue /]# 
  1. Change the root password with passwd:
[root@rescue /]# passwd
Enter new UNIX password: 
Retype new UNIX password: 
passwd: password updated successfully
[root@rescue /]# 
  • Exit, unmount, and shutdown:
    [root@rescue /]# exit
    exit
    root@rescue:~# umount /mnt
    root@rescue:~# shutdown -h now
             Starting Synchronise Hardware Clock to System Clock...
    
    1. 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.