Mayor of Munich Dieter Reiter cracked the first beer keg on Saturday with the traditional shout of "It's tapped" - thus opening the city's 185th Octoberfest.
It's the world's largest, wildest and most famous beer festival and draws around six million people every year.
Visitors who arrive early get a seat at the coveted long communal tables in tents, where they can swig beer, munch on sausages, pretzel or pork knuckle, and listen to oompah bands.
Oktoberfest has its origins in a horse race that took place in 1810 to celebrate the wedding of Bavaria's Crown Prince Ludwig and Princess Therese of Saxony-Hildburghausen.
The public festivities became more elaborate as time went on and it gradually turned into a folk festival.
This year's festival runs from September 22 to October 7.