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    Juniper: Boot To Single-User Mode

    Posted on 1 min

    Netadmin

    Table of Contents

    Summary

    These are notes for booting into Single-User mode on a Juniper firewall.

    Booting To Single-User Mode

    First step is to wait until we see the prompt below and press the spacebar.

    Hit [Enter] to boot immediately, or space bar for command prompt.

    Below is the prompt we should see to boot to this.

    loader>

    Entered the -s flag for boot and it did something. Goes through the boot process and all of that fun stuff.

    boot -s

    Looks like I now have the options to enter recovery mode!

    ***** FILE SYSTEM WAS MODIFIED *****
System watchdog timer disabled
Enter full pathname of shell or 'recovery' for root password recovery or RETURN for /bin/sh:

    Entered the recovery command.

    recovery

    We are now at the cli prompt for the device! Time to reset the root password so we can finally use it.

    root@lab-srx220-r01>

    Now we should be able to proceed to do whatever we neeed to do on the system.

    Reference

    This is a list for reference I used while writting this.