转自：带你玩转kubernetes-k8s（第61篇-Kubernetes之资源紧缺时的Pod驱逐机制）k8s操作减少pod坚持的道路注定孤独的博客-CSDN博客
#!/bin/bash
#!/usr/bin/env bash
# this script reproduces what the kubelet does
# to calculate memory. available relative to root cgroup.
# current memory usage
memory_capacity_in_kb=$(cat /proc/meminfo | grep MemTotal | awk '{print $2}')
memory_capacity_in_bytes=$((memory_capacity_in_kb * 1024 ))
memory_usage_in_bytes=$(cat /sys/fs/cgroup/memory/memory.usage_in_bytes)
memory_total_inactive_file=$(cat /sys/fs/cgroup/memory/memory.stat | grep total_inactive_file | awk '{print $2}')
memory_working_set=$memory_usage_in_bytes
if [ "$memory_working_set" -lt "$memory_total_inactive_file" ]; then
memory_working_set=0
else
memory_working_set=$((memory_usage_in_bytes-memory_total_inactive_file))
fi
memory_available_in_bytes=$((memory_capacity_in_bytes - memory_working_set ))
memory_available_in_kb=$((memory_available_in_bytes / 1024 ))
memory_available_in_mb=$((memory_available_in_kb / 1024 ))
echo "memory.capacity_in_bytes $memory_capacity_in_bytes"
echo "memory.usage_in_bytes $memory_usage_in_bytes"
echo "memory.total_inactive_file $memory_total_inactive_file"
echo "memory.working_set $memory_working_set"
echo "memory.available_in_bytes $memory_available_in_bytes"
echo "memory.available_in_kb $memory_available_in_kb"
echo "memory.available in mb $memory_available_in_mb"
