Juniper SRX: THIS DEVICE HAS BOOTED FROM THE BACKUP JUNOS IMAGE

Juniper SRX: THIS DEVICE HAS BOOTED FROM THE BACKUP JUNOS IMAGE

 Today I looked at my Juniper firewall and I saw an amber light. This means an alarm!.
I logged to it, and I was greeted by the Warning message below:

root@192.168.1.1's password:
--- JUNOS 11.2R4.3 built 2011-11-24 08:11:51 UTC
**********************************************************************
**                                                                   **
**   WARNING: THIS DEVICE HAS BOOTED FROM THE BACKUP JUNOS IMAGE     **
**                                                                   **
** It is possible that the primary copy of JUNOS failed to boot up   **
** properly, and so this device has booted from the backup copy.     **
**                                                                   **
** Please re-install JUNOS to recover the primary copy in case       **
** it has been corrupted.                                            **
**                                                                   **
***********************************************************************

 

I started investigating it and this is the reason.

If your SRX Firewall is unable to boot from the primary JUNOS OS image, and instead boots from tha backup root partition, you will see this messsage.

 

The way to solve this problem is by issueing the command below:

 

root@192.168.1.1> request system snapshot slice alternate

 

Note:  After the procedure, the primary root partition will contain the same version of JUNOS as the backup root partition.

 

This will clear the alarm and make your SRX boot successfuly from the root partition.

 

Hope you enjoy this post

 

by Renato de Oliveira