I'm with these suggestions as well, either a ledger board or a french cleat are the simplest means by which to hang wall cabinets because either provides you with a level support to bear the weight of the cabinets while you screw them down.
A french cleat has to be one of the most clever cabinet hanging solutions that I have ever seen. Just hook the cabinet over the cleat. If you wish to lock things down, put a screw through the cabinet into the lower cleat, then another screw down low on the cabinet into the wall (stud preferred, but even hollow wall anchors will serve to keep the cabinet from lifting from the wall). Or, if the cabinet is sufficiently heavy, you can simply leave it hooked over the cleat and it isn't going anywhere.
The cleats themselves are just some 1x material (1x6 or 1x8 for instance) ripped on the tablesaw with the blade set for a 45-degree angle. You are then left with two angled mating edges that, once secured to the wall, provides you a solid 'hook' that isn't going to go anywhere. You then attach the other half to the upper backside of your cabinets and you simply hook the cabinets over the cleat as you hang them. Long cleats also provide you the benefit of not having to hunt for studs with every cabinet since the wall-cleat can be screwed into studs all along its length with appropriately sized wood screws.
If you want to do them more traditionally then you'll lay out a level line and secure a straight ledger board to studs at each end (and the middle for long runs) aligned for the bottom of your cabinetry. You then have your level bottom and a 'third hand' that will relieve you from supporting the weight of the cabinets while you screw them in place. Just be sure to locate your studs prior to hanging -- make your measurements, then predrill the cabinets so that their screw holes are aligned with studs. Then set the cabinet on the ledger board, align it horizontally on the wall, then screw it into studs (top and bottom). Use washer-head screws or wood screws (likely 2-1/2" minimum to 4" long maximum) with washers to secure your cabinets.
Good luck! I still need to get around to building a bunch of cabinetry for my shop one of these days, so you're already well ahead of me.
PS - Ignore the part about studs, I forgot your wall is concrete block, which makes it much easier to find proper mounting locations -- just use hollow wall anchors (they type with plastic inserts) to secure your screws to the walls -- you also won't need screws nearly as long since you are not penetrating drywall. I don't recommend masonry screws for wall cabinets since they can sometimes loosen up or strip in concrete blocks.