新增learn-kubernetes（https://github.com/yyong-brs/learn-kubernetes）相关文件

learn/learn-kubernetes-master/kiamol/ch19/kind/kiamol-ch19-config.yaml

@@ -0,0 +1,11 @@
+kind: Cluster
+apiVersion: kind.x-k8s.io/v1alpha4
+nodes:
+- role: control-plane
+  kubeadmConfigPatches:
+  - |
+    kind: InitConfiguration
+    nodeRegistration:
+      kubeletExtraArgs:
+        eviction-hard: "memory.available<40%"
+        eviction-pressure-transition-period: "30s"

learn/learn-kubernetes-master/kiamol/ch19/kind/print-memory.sh

@@ -0,0 +1,30 @@
+#!/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))
+memory_capacity_in_mb=$((memory_capacity_in_kb / 1024))
+
+
+echo '----------------'
+echo "Memory capacity : ${memory_capacity_in_mb}M"
+echo "Memory available: ${memory_available_in_mb}M"
+echo '----------------'