Lacazette scored the winning goal for Arsenal nine minutes from time.
Gabon worldwide Pierre Aubameyang increased the scoreline for the Gunners in the 62nd minute and it was Lacazette that provided the assist.
The Welsh side may not have scored even one goal in their three games so far but they have had two 0-0 draws to show for it, and would you believe that, including their Championship games last season, they have lost just one of their last ten home League games.
Arsenal go to Newcastle next in the Premier League on September 15.
The Arsenal boss is set to give his summer signing Lucas Torreira his first start in the red shirt of the Londoners.
Cardiff and Arsenal have not played each other since January 1, 2014, when Arsenal defeated the Bluebirds 2-0 at Emirates Stadium.
'Extremists' could be freed as charges tossed
Forensic medical investigators have not identified the cause and manner of the boy's death as they continue their analysis. Prosecutors could still try to pursue charges by seeking an indictment from a grand jury.
Some fans turned on Granit Xhaka after his error nearly cost Arsenal during our thrilling 3-2 victory over Watford at Vicarage Road this afternoon. Today was no different, his distribution was poor and his goalkeeping for the first goal could have been much better.
Going into this match, the Bluebirds hadn't beaten Arsenal in the past 13 matches between the two sides, with their last victory against the north London side coming way back in 1961.
His continuous exclusion from the starting eleven has therefore been a surprise to many as he has been tipped to provide the steel cover for the defence, a quality that has been missing for Arsenal in the past years. He had been struggling for the first three games and this goal will do just enough to boost his confidence. Petr Cech also had a nightmare with the ball at his feet and if Unai Emery is intent on playing the ball out from the back it may be time for Bernd Leno.
The former Germany global made his return to the starting line-up this afternoon following his absence from Arsenal's 3-1 home victory against Premier League strugglers West Ham United.
45+2' GOAL! Camarasa scores Cardiff's first goal of the season on the stroke of halftime!
Cardiff again came from behind to level in the 70th minute, however, with Danny Ward angling a brilliant header into the bottom corner after Morrison had made first contact.
'Top teams take their chances, there's a lot to work on but we didn't want to park the bus - we wanted the fans to enjoy it and I felt we gave them a good game here.