31 lines
1.1 KiB
Bash
31 lines
1.1 KiB
Bash
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#!/bin/bash
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#!/usr/bin/env bash
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# This script reproduces what the kubelet does
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# to calculate memory.available relative to root cgroup.
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# current memory usage
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memory_capacity_in_kb=$(cat /proc/meminfo | grep MemTotal | awk '{print $2}')
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memory_capacity_in_bytes=$((memory_capacity_in_kb * 1024))
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memory_usage_in_bytes=$(cat /sys/fs/cgroup/memory/memory.usage_in_bytes)
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memory_total_inactive_file=$(cat /sys/fs/cgroup/memory/memory.stat | grep total_inactive_file | awk '{print $2}')
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memory_working_set=${memory_usage_in_bytes}
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if [ "$memory_working_set" -lt "$memory_total_inactive_file" ];
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then
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memory_working_set=0
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else
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memory_working_set=$((memory_usage_in_bytes - memory_total_inactive_file))
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fi
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memory_available_in_bytes=$((memory_capacity_in_bytes - memory_working_set))
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memory_available_in_kb=$((memory_available_in_bytes / 1024))
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memory_available_in_mb=$((memory_available_in_kb / 1024))
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memory_capacity_in_mb=$((memory_capacity_in_kb / 1024))
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echo '----------------'
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echo "Memory capacity : ${memory_capacity_in_mb}M"
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echo "Memory available: ${memory_available_in_mb}M"
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echo '----------------'
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