Say, I have basic Linode config: Linode 1024 RAM + LAMP stack.

I have heard that sometimes users cannot access the website because of high-load. What will be the best way to have great availability?
I mean, let's skip LinodeBalancer for now.

What tips & tricks you may advice?

I can destroy a 512 single-handedly, so let's say two users.

There is no such thing as a "user"; there's just some number of simultaneous requests. For example, right now, I am "using" forum.linode.com, but I am using absolutely(*) no resources. When I hit "Submit"(**), I'll be hitting that thing like an old band saw for a second or so, but that's it.

See my other post yesterday for applicable advice on things to measure.

(*) OK, so there's a session cookie in a database somewhere. I'm not going to insult Linode's staff by implying this is an overwhelming burden.
(**) Assuming I don't hit Perview first, which is a valid assumtion.

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