How can I make Haproxy do health-check for backup servers only if all non-backup servers are unavailable?

I don't know what is the reason to vote-down this question, can you all help me find out this possible vote-down reason?


It's hard to tell how many servers you're talking about and how they're used:

  • how many is "lots" of backup servers
  • what do you mean by "slower unstable-online" ?
  • what does "unlikely unavailable" mean? Did you mean likely?

I just read the question, and I don't understand what you are looking for.

I was about to think that you mean backup server, to create a backup, but as I seen the tag haproxy so I guess it's for that product.

For me it's unclear as-is. Please edit to add detail.

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