You can downgrade to any earlier release on a standalone NetScaler appliance by using the CLI. Downgrading using the GUI is not supported.
Loss in configuration might occur when downgrading. You should compare the configurations before and after the downgrade, and then manually reenter any missing entries.
Follow the steps given below to downgrade a NetScaler standalone appliance running release 12.0 to an earlier release.
In this procedure, <release> and <releasenumber> represent the release version you are downgrading to, and <targetbuildnumber> represents the build number that you are downgrading to.
cp ns.conf.NS<releasenumber> ns.conf
Note: ns.conf.NS<releasenumber> is the backup configuration file that is automatically created when the system software is upgraded from release version <releasenumber> to the current release version. There may be some loss in configuration when downgrading. After the appliance restarts, compare the configuration saved in step 3 with the running configuration, and make any adjustments for features and entities configured before the downgrade. Save the running configuration after making the changes.
Important: If routing is enabled, perform step 5. Otherwise, skip to step 6.
If the configuration file for the build that you are downgrading to exists on the appliance, you are prompted to load that configuration, as shown in the following figure.
Figure 1. Downgrade menu if configuration file exists
If the free space available on the flash drive is insufficient to install the new build, the NetScaler appliance aborts the installation. Manually clean up the flash drive and restart the installation.
Last login: Mon Apr 24 02:06:52 2017 from 10.102.29.9
> save config
root@NSnnn# cp ns.conf.NS10.5 ns.conf
root@NSnnn# cd /var/nsinstall
root@NSnnn# mkdir 10.5nsinstall
root@NSnnn# cd 10.5nsinstall
root@NSnnn# mkdir build_57
root@NSnnn# cd build_57
root@NSnnn# ftp 10.102.1.1
ftp> mget build-10.5-57_nc.tgz
root@NSnnn# tar -xzvf build-10.1-125_nc.tgz
installns version (10.5-57) kernel (ns-10.5-57.gz)
Copying ns-10.5-57.gz to /flash/ns-10.5-57_nc.gz ...
Changing /flash/boot/loader.conf for ns-10.5-57 ...
Installation has completed.
Reboot NOW? [Y/N] Y