Preheat oven to 350° F. Grease a 5×9 bundt pan with non-stick cooking spray.
Combine flour, baking soda, salt, sugar and cinnamon in a large bowl.  Whisk until well combined.
Stir together coconut oil, vanilla, rum, milk and bananas in a separate large bowl until evenly mixed together.  
Add wet ingredients to dry ingredients and stir a few times, add walnuts and continue to stir until all ingredients are combined.  Do not over mix.
Bake for 55-60 minutes or until when tested with a knife, it comes out clean. 
Cool in bundt pan for 20 minutes.  Remove from pan and transfer to a cooling rack to cool completely.
For glaze
Whisk together sugar and rum in a small bowl.  If mixture is too thick, add  1-2 teaspoons to mixture.  Drizzle over banana bread.  Let glaze set for 10 minutes before serving.