Security and privacy: Do you know what's lurking on your system?
The first was the kernel. I ended up hand-crafting a kernel, removing anything I thought was unlikely we'd need, then restarting several times when I discovered that the system wouldn't boot because the things I thought I understood were more … esoteric than I'd realised. I'm not a kernel developer, and this was a salutary lesson in how skilled those folks are. At least, at the time I was doing it, there were less code and fewer options than there are today. On the other hand, I was having to hack back to a required state, and now there are more cut-down kernels and systems to start with than there were back then.
The other piece I left for last was pruning the installed operating system applications and associated utilities. Again, there are cut-down options that are easier to use now than then, but I also had some odd requirements—I believe that we needed Java, for instance, which has, or had …. well let's say a lot of dependencies. Most modern Linux distributions start off by installing lots of pieces so you can get started quickly without having to worry about trying to work out dependencies for every piece of external software you want to run.
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