Pure concrete hollow cylinder
The simple way to "achieve that shape" is, of course, to buy it precast, which is almost certainly what the picture is - depending on size, it's either a section of well-casing, drainage pipe, or a manhole extension.

@BrownRedHawk is correct that it may (indeed, probably will) destructively deteriorate if used as direct fire containment - the interior should be lined with firebrick or castable refractory cement. The picture is clearly of the first time the thing in the picture has been fired, as it's remarkably clean as well as being intact - it probably has not held up well to the use, but pictures of that won't likely be forthcoming.

It will also burn relatively horribly unless some air inlets are made near the bottom.