Restoring Junos Os; Creating An Emergency Boot Device; Chapter 23 Restoring Junos Os - Juniper QFX5100 Hardware Manual

CHAPTER 23

Restoring Junos OS

Creating an Emergency Boot Device

Copyright © 2016, Juniper Networks, Inc.
Creating an Emergency Boot Device on page 235
Performing a Recovery Installation Using an Emergency Boot Device on page 237
If Junos OS on the device is damaged in some way that prevents the software from
loading properly, you can use an emergency boot device to repartition the primary disk
and load a fresh installation of Junos OS. Use the following procedure to create an
emergency boot device.
Before you begin, you need to download the installation media image for your device
and Junos OS release from
NOTE: You can create the emergency boot device on another Juniper
Networks switch or router, or any PC or laptop that supports Linux. The steps
you take to create the emergency boot device vary, depending on the device.
To create an emergency boot device:
Use FTP to copy the installation media image into the
1.
Insert a USB device into the USB port.
2.
From the Junos OS command-line interface (CLI), start the shell:
3.
user@device> start shell
%
Switch to the root account using the
4.
% su
Password: password
NOTE: The password is the root password for the device. If you logged in
to the device as root, you do not need to perform this step.
Enter the following command on the device:
5.
root@device% dd if=/var/tmp/filename of=/dev/da1 bs=1m
http://www.juniper.net/customers/support/
command:
su
.
/var/tmp directory on the device.
235