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設定swap(預設為60, 當系統使用到超過40% memory, 就會嘗試使用swap)
sysctl -w vm.swappiness=0 # from 60 -> 0
1) Filter Table
Filter is default table for iptables. So, if you don’t define you own table, you’ll be using filter table. Iptables’s filter table has the following built-in chains.