Loosen a strip of bark at one end of the log with a draw knife. Once you’ve separated a section of bark, pull up and you can usually peek full length strips from the log.
An alternative to using a draw knife to losen the strips of bark is to use a peeling spud.
A peeling spud has a steel blade about 6 inches long and about 2 1/2 inches wide mounted on long wood handle. The blade is slightly curved and sharpened on the end as well as on both sides.