The cloth on my driver’s side interior is falling off after 8.5 years. What retail glue or epoxy can I buy that would hold up to the hot and cold extremes in a non-garage kept auto. I don’'t want something that will bleed through the material prior to its drying, nor turn gooey in heat, age, etc. What do the pros use?
(If it matters, it is a Honda CR-V, and the dried glue from the initial install remains in place. What prep, if any, would be necessary?)
I’d use automotive interior and trim glue, and follow the directions. 
Any auto-parts store should have it. Some are direct-pressure, but most are like contact cement - you apply a bead, press the part to it, then pull them apart and let the glue [almost | completely] dry - then carefully press them together for a permanent bond. A little care should keep it from seeping through the fabric.
Make sure to read directions for any kinds of glue carefully. Many talk about letting it dry for a day or two before driving the vehicle. Ever heard about ‘sniffing glue’? Yep. Years ago we used RTV in the cockpits of small aircraft and pilots started complaining about getting dizzy and nauseous. Not good.
If nothing else, drive with the windows open and have the ventilation system on fresh and and NOT recirc.
“Yeahhhh, officer… I just glued my door trim on… wanna come for a riiiiide?”
Thanks, all, for the little tipsy. …Oops, I mean, tips! 
Not sure if you mean the headliner or cloth on the door panels, but I use a spray adhesive for foam and cloth on cars an motorcycles. One like this:
Spray is great for new installation or major reinstallation. Can get messy for tacking corners or small pieces, though.
I usually just mask it off with some newspaper and masking tape.