【K8S分配率】Shell脚本计算Kubernetes集群CPU和内存总分配率

目录

1. 分配率计算逻辑

2. 完整脚本

3. 脚本执行结果

1. 分配率计算逻辑

CPU分配率 = (所有Pod的CPU请求总和 / 节点CPU可分配总和) * 100%
内存分配率 = (所有Pod的内存请求总和 / 节点内存可分配总和) * 100%

2. 完整脚本

#!/bin/bash # 设置颜色输出 RED='\033[0;31m' GREEN='\033[0;32m' YELLOW='\033[1;33m' NC='\033[0m' # No Color echo -e "${GREEN}=== K8s集群Pod资源分配率计算 ===${NC}\n" # 获取节点总资源 echo "计算节点总资源..." NODE_CPU_TOTAL=0 NODE_MEM_TOTAL=0 # 获取所有节点的可分配资源 NODES=$(kubectl get nodes -o jsonpath='{.items[*].metadata.name}') for node in $NODES; do echo "处理节点: $node" # 获取节点CPU（单位：核） node_cpu=$(kubectl describe node $node | grep -A 1 "Allocatable" | grep cpu | awk '{print $2}') if [[ "$node_cpu" == *"m" ]]; then node_cpu=$(echo $node_cpu | sed 's/m//') node_cpu=$(echo "scale=2; $node_cpu / 1000" | bc | xargs printf "%.2f\n") fi NODE_CPU_TOTAL=$(echo "$NODE_CPU_TOTAL + $node_cpu" | bc) # 获取节点内存（转换为MiB） node_mem=$(kubectl describe node $node | grep -A 6 "Allocatable" | grep memory | awk '{print $2}') # 转换不同单位的内存为KiB if [[ "$node_mem" == *"Ki" ]]; then node_mem=$(echo $node_mem | sed 's/Ki//') node_mem_mib=$(echo "scale=2; $node_mem / 1024" | bc) elif [[ "$node_mem" == *"Mi" ]]; then node_mem_mib=$(echo $node_mem | sed 's/Mi//') elif [[ "$node_mem" == *"Gi" ]]; then node_mem_mib=$(echo $node_mem | sed 's/Gi//') node_mem_mib=$(echo "$node_mem_mib * 1024" | bc) elif [[ -n "$node_mem" ]]; then node_mem_mib=$(echo "scale=2; $node_mem /1024/1024" | bc) else node_mem_mib=0 fi NODE_MEM_TOTAL=$(echo "$NODE_MEM_TOTAL + $node_mem_mib" | bc) done echo -e "节点CPU总量: ${NODE_CPU_TOTAL}核" echo -e "节点内存总量: ${NODE_MEM_TOTAL}MiB\n" # 获取所有Pod的请求资源总量 echo "计算Pod请求资源总量..." POD_CPU_REQUEST=0 POD_MEM_REQUEST=0 # 获取所有命名空间的Pod NAMESPACES=$(kubectl get namespaces -o jsonpath='{.items[*].metadata.name}') for ns in $NAMESPACES; do # 获取该命名空间下所有Pod的CPU请求 cpu_requests=$(kubectl get pods -n $ns -o jsonpath='{.items[*].spec.containers[*].resources.requests.cpu}') for cpu in $cpu_requests; do if [[ "$cpu" == *"m" ]]; then cpu_val=$(echo $cpu | sed 's/m//') cpu_val=$(echo "scale=2; $cpu_val / 1000" | bc | xargs printf "%.2f\n") elif [[ -n "$cpu" ]]; then cpu_val=$cpu else cpu_val=0 fi POD_CPU_REQUEST=$(echo "$POD_CPU_REQUEST + $cpu_val" | bc) done # 获取该命名空间下所有Pod的内存请求 mem_requests=$(kubectl get pods -n $ns -o jsonpath='{.items[*].spec.containers[*].resources.requests.memory}') for mem in $mem_requests; do if [[ "$mem" == *"Ki" ]]; then mem_val=$(echo $mem | sed 's/Ki//') mem_val_mib=$(echo "scale=2; $mem_val / 1024" | bc) elif [[ "$mem" == *"Mi" ]]; then mem_val_mib=$(echo $mem | sed 's/Mi//') elif [[ "$mem" == *"Gi" ]]; then mem_val_mib=$(echo $mem | sed 's/Gi//') mem_val_mib=$(echo "$mem_val_mib * 1024" | bc) elif [[ -n "$mem" ]]; then mem_val_mib=$mem else mem_val_mib=0 fi POD_MEM_REQUEST=$(echo "$POD_MEM_REQUEST + $mem_val_mib" | bc) done done echo -e "Pod CPU请求总量: ${POD_CPU_REQUEST}核" echo -e "Pod内存请求总量: ${POD_MEM_REQUEST}MiB\n" # 计算分配率 if [[ $(echo "$NODE_CPU_TOTAL > 0" | bc) -eq 1 ]]; then CPU_ALLOC_RATIO=$(echo "scale=2; $POD_CPU_REQUEST / $NODE_CPU_TOTAL * 100" | bc) else CPU_ALLOC_RATIO=0 fi if [[ $(echo "$NODE_MEM_TOTAL > 0" | bc) -eq 1 ]]; then MEM_ALLOC_RATIO=$(echo "scale=2; $POD_MEM_REQUEST / $NODE_MEM_TOTAL * 100" | bc) else MEM_ALLOC_RATIO=0 fi # 输出结果 echo -e "${GREEN}=== 资源分配率结果 ===${NC}" echo -e "CPU分配率: ${YELLOW}${CPU_ALLOC_RATIO}%${NC}" echo -e "内存分配率: ${YELLOW}${MEM_ALLOC_RATIO}%${NC}" # 颜色标记警告 # bc执行一个逻辑判断，而不是一个算术运算，用 1表示逻辑真（True），用 0表示逻辑假（False） if [[ $(echo "$CPU_ALLOC_RATIO >= 80" | bc) -eq 1 ]]; then echo -e "${RED}警告: CPU分配率较高，建议扩容节点或优化Pod资源请求${NC}" fi if [[ $(echo "$MEM_ALLOC_RATIO >= 80" | bc) -eq 1 ]]; then echo -e "${RED}警告: 内存分配率较高，建议扩容节点或优化Pod资源请求${NC}" fi

3. 脚本执行结果