问题描述
kubectl 顶级节点
名称 cpu(核心数) cpu% MEMORY(字节) MEMORY%
gsdjsgfhdsgfz-12345665-jisj000000 934m 24% 10439Mi 82%
gsdjsgfhdsgfz-12345665-jisj000001 717m 18% 9132Mi 72%
gsdjsgfhdsgfz-12345665-jisj000002 1099m 28% 7614Mi 60%
如何使用 java io.fabric8 kubernetes-client 库获取 cpu% 和 MEMORY% 值。
try (KubernetesClient k8s = new DefaultKubernetesClient()) {
NodeMetricslist nodeMetricslist = k8s.top().nodes().metrics();
for (NodeMetrics nodeMetrics : nodeMetricslist.getItems()) {
logger.info("{} {} {}",nodeMetrics.getMetadata().getName(),nodeMetrics.getUsage().get("cpu"),nodeMetrics.getUsage().get("memory"));
}
}
得到输出是:-
节点名
中央处理器:-1094942089n
内存:-7830672Ki
如何获取百分比值?
解决方法
我最近不得不实现同样的功能,不幸的是我没有找到一种方法来仅使用 top()
API 来获取百分比,我不得不执行两次调用,一次调用 nodes()
以检索总容量,另一个到 top()
以检索已用容量。然后就是计算百分比的问题了。
工作代码片段:
public static void main(String[] args) {
KubernetesClient kubernetesClient = new DefaultKubernetesClient();
Map<String,Node> nodeMap = kubernetesClient.nodes().list().getItems()
.stream()
.collect(Collectors.toMap(node -> node.getMetadata().getName(),Function.identity()));
List<NodeUsage> usageList = kubernetesClient.top().nodes().metrics().getItems()
.stream()
.map(metric -> new NodeUsage(nodeMap.get(metric.getMetadata().getName()),metric.getUsage()))
.collect(Collectors.toList());
System.out.println(usageList);
}
private static class NodeUsage {
private final Node node;
private final BigDecimal cpuPercentage;
private final BigDecimal memoryPercentage;
private NodeUsage(Node node,Map<String,Quantity> used) {
this.node = node;
cpuPercentage = calculateUsage(used.get("cpu"),node.getStatus().getAllocatable().get("cpu"));
memoryPercentage = calculateUsage(used.get("memory"),node.getStatus().getAllocatable().get("memory"));
}
private static BigDecimal calculateUsage(Quantity used,Quantity total) {
return Quantity.getAmountInBytes(used)
.divide(Quantity.getAmountInBytes(total),2,RoundingMode.FLOOR)
.multiply(BigDecimal.valueOf(100));
}
public Node getNode() {
return node;
}
public BigDecimal getCpuPercentage() {
return cpuPercentage;
}
public BigDecimal getMemoryPercentage() {
return memoryPercentage;
}
}