Looks like you *could* also set the "cache_memlimit" to the lowest setting allowed (8mb).
For what it's worth, if you're getting attacked by memcached's, it's pretty easy to disable them since the source won't be spoofed. They may accept "shutdown\r\n", but also running "flush_all\r\n" in a loop will prevent amplification.
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requires a newerish version, and the attack only requires 1mb of memory. there's also code that ensures 1mb of memory is available to every slab class even if the limit is lower than that. you could expand it in the other direction, fill it with garbage and OOM tho ;)
End of conversation
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