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I want to create tar.gz filesystem with following command:

[root@ti3 ~]# livemedia-creator --make-tar --compression gzip --iso=/tmp/boot8.iso --ks=/root/x/kickstart-ti.ks --live-rootfs-size 8 --no-virt 
2016-03-18 10:14:56,466: disk_size = 7GB
2016-03-18 10:14:56,466: disk_img = /var/tmp/root.tar.xz
Starting installer, one moment...

The message in stdout is saying "/var/tmp/root.tar.xz". In the end of process I got /var/tmp/root.tar.gz as expected, but I burned a lot of time to make sure about it.

Sorry about that.

Also note that --no-virt doesn't use the --iso parameter and --live-rootfs-size is only used with --make-pxe-live

Thanks for advice, I am new to lorax.

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory, and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://rhn.redhat.com/errata/RHBA-2016-2165.html