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https://support.juniper.net/support/downloads/


Copy the file to the ACX ( SFTP )

set system name-server 8.8.8.8


file copy "release & user specific link to software"  /var/tmp/image-name.tgz

request system software validate /var/tmp/image-name.tgz 
request system software add /var/tmp/image-name.tgz 
request system reboot


Code Block
titlesoftware upgrade ( sftp to ACX )
collapsetrue
root@ACX5048-1> request system software validate /var/tmp/jinstall-host-acx5k-18.2R1.9-signed.tgz


{master:0}
root@ACX5048-1> request system software add /var/tmp/jinstall-host-acx5k-18.2R1.9-signed.tgz
Verified jinstall-vjunos-18.2R1.9.tgz signed by PackageDevelopmentRSA_2015
Adding vjunos...
Saving contents of boot area prior to installation

WARNING:     This package will load JUNOS 18.2R1.9 software.
WARNING:     It will save JUNOS configuration files, and SSH keys
WARNING:     (if configured), but erase all other files and information
WARNING:     stored on this machine.  It will attempt to preserve dumps
WARNING:     and log files, but this can not be guaranteed.  This is the
WARNING:     pre-installation stage and all the software is loaded when
WARNING:     you reboot the system.

POST-INSTALL...
Saving the config files ...
NOTICE: uncommitted changes have been saved in /var/db/config/juniper.conf.pre-install
Pushing installation package to host...
Upgrade Host OS to 18.2R1.9...
./jinstall-acx5k-18.2R1.9.img.gz: OK
/boot/boot
Extracting image...
Host upgrade staging completed. Need reboot to complete upgrade installation.
WARNING: Changing next boot to SSD0
WARNING: Changing boot device enable from  0x3F to 0x3F
Install jinstall-vjunos completed

WARNING:     A REBOOT IS REQUIRED TO LOAD THIS SOFTWARE CORRECTLY. Use the
WARNING:     'request system reboot' command when software installation is
WARNING:     complete. To abort the installation, do not reboot your system,
WARNING:     instead use the 'request system software delete jinstall'
WARNING:     command as soon as this operation completes.

Saving state for rollback ...

{master:0}
root@ACX5048-1> request system reboot
Reboot the system ? [yes,no] (no) yes

Shutdown at Wed Sep 26 13:56:20 2018.
[pid 3570]

{master:0}
root@ACX5048-1>
*** System shutdown message from root@ACX5048-1 ***

System going down in 1 minute


no ssh access after reboot

https://www.juniper.net/documentation/en_US/junos/topics/reference/configuration-statement/root-login-edit-system.html

Code Block
titleno root access after upgrade
collapsetrue
login as: root
Access denied
Using keyboard-interactive authentication.





Just log into the ACX on the console port:

https://www.juniper.net/documentation/en_US/release-independent/junos/topics/reference/specifications/acx5000-management-panel.html

Image Added


set system services ssh root-login allow








set system services web-management http interface em0.0

...