https://www.juniper.net/documentation/en_US/junos/topics/task/configuration/virtual-chassis-qfx-series-cli.html
...
3- copy the file to the QFX and do an ISSU upgrade
request system software add /var/tmp/jinstall-host-qfx-5e-x86-64-18.3R1.9-secure-signed.tgz
request system reboot
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1- ping 8.8.8.8
2- ping cdn.juniper.net
3- download the file
root@QFX5110-2> file copy "...signed.tgz?SM_USER=jkriker&__gda__=1547721017_18189c0a4da993089ccbc92b5112536b" /var/tmp/image-name.tgz
/var/tmp//...transferring.file.........QuZcgj/100% of 1316 MB 2495 kBps 00m00s
{master:0}
root@QFX5110-2> request system software add /var/tmp/image-name.tgz
Verified image-name signed by PackageProductionEc_2018 method ECDSA256+SHA256
Pushing Junos image package to the host...
Installing /var/tmp/install-media-qfx-5e-junos-18.4R1.8-secure.tgz
Extracting the package ...
============================================
Current Host kernel version : 3.14.52-rt50-WR7.0.0.9_ovp
Package Host kernel version : 3.14.52-rt50-WR7.0.0.9_ovp
Current Host version : 3.1.0
Package Host version : 3.1.0
Min host version required for applications: 3.0.7
Skipping Host OS upgrade!
============================================
Setting up Junos host applications for installation ...
JUNOS OS upgrade staged. Reboot the system to complete installation!
{master:0}
root@QFX5110-2> request system reboot
Reboot the system ? [yes,no] (no) yes
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