This article documents how to perform a Junos software installation or upgrade on SRX devices and scheduling the reboot for later hence requiring minimum downtime and less effort.

The upgrade can be performed and the reboot can be scheduled for minimum down time.

1. Install software

   >request system software add no-validate /var/tmp/ <Junos-File>

   Using any of the upgrade methods mentioned in  KB16652 - SRX Getting Started - Junos Software Installation/Upgrade [juniper.net] .

2. Add a system reboot request for midnight or (any suitable time).

   request system reboot at <time>
   
   Reboot when the system time is hour:minute. The system reboots at the absolute time that you specify, on the current day. You must select a 2-digit hour in 24-hour format and a 2-digit minute.

2020-06-24: Article reviewed for accuracy; no changes required