If the barrel in your dream was upright, full and/or in good condition, it forecasts financial security. But if it was empty and/or rolling, it suggests you should take measures to protect your position.
(Barrel; Hiding place) In a dream, a cask means hypocrisy or concealing evil actions.
Since a cask or barrel is often hand-made, to dream of one indicates the care taken in dealing with our own emotional make-up. This is because a cask was, and is, mostly used for storage.
A keg, particularly an old wooden one, suggests craftsmanship. If it is full, craftsmanship and expertise have fulfilled their purpose. If it is half full or empty, there is much work to be done. A beer barrel will have the same significance.
A great quantity, unless empty, which implies great need