Description

In order to check that the installation was made correctly and the new Junos that the system will use after the reboot is the correct one, we can use the show system software backup post install command to verify.

Solution

Steps to take in order to verify the pending Junos that will run post reboot

Initial SRX state:
Hostname: jtac-srx340-r2015
Model: srx340
Junos: 21.2R3-S5.2          <<<< Current Junos version
labroot@jtac-srx340-r2015> show system software backup
Backup JUNOS package information:
File name: /altroot/cf/packages/junos-20.2R3-S2.5      <<<< Old backup Junos version
File size: 404714494

Install the desired Junos: 
> request system software add /var/tmp/junos-srxsme-21.4R3-S1.2.tgz no-copy no-validate
Formatting alternate root (/dev/da0s2a)...
/dev/da0s2a: 596.0MB (1220680 sectors) block size 16384, fragment size 2048
       using 4 cylinder groups of 149.02MB, 9537 blks, 19200 inodes.
super-block backups (for fsck -b #) at:
 32, 305216, 610400, 915584
Installing package '/altroot/cf/packages/install-tmp/junos-21.4R3-S1.2' ...
[]
JUNOS 21.4R3-S1.2 will become active at next reboot
WARNING: A reboot is required to load this software correctly
WARNING:    Use the 'request system reboot' command
WARNING:        when software installation is complete
Saving state for rollback ...

After the installation is completed, check the backup OS: 
> show system software backup
Backup JUNOS package information:
File name: /altroot/cf/packages/junos-21.4R3-S1.2     <<< pending New Junos to run after reboot
File size: 412445557

Reboot the SRX 
>request system reboot

Post reboot checks: 
> show version
Model: srx340
Junos: 21.4R3-S1.2        <<< New running Junos
labroot@jtac-srx340-r2015> show system software backup
Dec 07 22:57:11
Backup JUNOS package information:
File name: /altroot/cf/packages/junos-21.2R3-S5.2     <<< The previous Junos version
File size: 412736274

Modification History

18 Dec 2023 - Initial draft