Celtic midfielder Tommy Rogic had made it 1-1 in the first half and Tomi Juric added Australia's second after the break from a goal that was allowed to stand despite a suggestion of handball leading to a review from the video assistant referee.
Australia faces Joachim Low's legendary outfit on Monday night (Tuesday morning AEST) in Sochi.
But it was a much more composed performance by the Socceroos in the second half and just before the hour Australia reduced the deficit.
Germany will be expected to win this Confederations Cup match and continue their 10 game unbeaten run.
"So if people are easily dismissing that, they'll dismiss everything else", Postecoglou continued. "They're a great team. abundant in Bundesliga stars and European stars", Kruse said.
Australia, the reigning Asian Cup Champions, are in good form too, excluding a 4-0 hammering in a friendly against Brazil last week.
Julian Draxler, an unused substitute in the 2014 World Cup final win over Argentina, restored Germany's lead from the penalty spot before halftime.
Germany once again looked like they were going to run away with the game just after halftime, scoring their third in the 48th minute.
The match in Sochi will be the sixth time that the two nations have faced one another, but while Germany won the first three, Australia have recorded a win and a draw in the last two contests. However, even with a lot of individual qualities, it remains to be seen how they'll perform as a unit.
Like everyone in the Socceroos camp, Cahill is confident Australia can leave a mark on the tournament. Stindl exploited vast gaps in the center of the pitch to advance unchecked to meet a cutback from 21-year-old winger Julian Brandt.
Germany made wholesale changes to their squad, with only seven players from their EURO 2016 squad called in for this tournament.
With Bayer Leverkusen's Brandt causing mayhem down the right flank, striker Sandro Wagner had two clear chances, a diving header and then a shot which both went wide.
The German's arrive in Russian Federation with an unblemished 100 per cent record in their World Cup qualifying group - winning all six games, scoring 27 and conceding just once. Rodic's shot came off defender Shkodran Mustafi and he followed up with a shot that went under Leno.
It was extended further three minutes into the second half. Joshua Kimmich set up the goal, finding Goretzka in space with a through ball, and Goretzka lofted the ball into the top corner, over Mat Ryan.
Mexico controlled possession and spent more time in Portugal's area, but the Euro 2016 champions were a constant threat on the counterattack in front of 34,372 fans at the Kazan Arena.