如何使用 java io.fabric8 kubernetes-client 库获取节点 CPU% 和 MEMORY% 值
how to get the Node CPU% and MEMORY% value using java io.fabric8 kubernetes-client library
kubectl 顶级节点
NAME CPU(核心) CPU% 内存(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"));
}
}
得到的输出是:-
节点名称
cpu:-1094942089n
内存:-7830672Ki
如何取百分比值?
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通过单独使用 top()
API 来获取百分比,我不得不执行两个调用,一个到 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
一段工作代码:
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;
}
}
kubectl 顶级节点
NAME CPU(核心) CPU% 内存(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"));
}
}
得到的输出是:-
节点名称
cpu:-1094942089n
内存:-7830672Ki
如何取百分比值?
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通过单独使用 top()
API 来获取百分比,我不得不执行两个调用,一个到 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
一段工作代码:
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;
}
}