Hi @samantha,
If it’s not too much trouble could you create a new post/question, as it’s easier for us to track internally.
Also do you know what packages/utilities do you want in this custom Linux image? Is it just mysql? You mention the entire LAMP stack earlier. In short I can’t say for certain what all the steps would be as I’m not familiar with each package. But in short the process will probably be add each package you want to IMAGE_INSTALL_append and then try a build. Either it just works or there are further dependencies/configuration that need to be handled per package. That being said we won’t really know until we just try it.
Best Regards,
Jeremias