為在k8s上運行的java應用程式設定Xmx和Xms

我有一個在 k8s 上運行的應用程式，想更新 java heapsize 。我已經更新了 JAVA_OPTS 環境變數并將其設定在部署檔案中，如下所示

- name: JAVA_OPTS
              value: "-Xmx768m -XX:MaxMetaspaceSize=256m"

但是當我運行以下命令時，我的更改似乎沒有生效

 java -XX: PrintFlagsFinal -version | grep -iE 'HeapSize|PermSize|ThreadStackSize'
     intx CompilerThreadStackSize                   = 0                                   {pd product}
    uintx ErgoHeapSizeLimit                         = 0                                   {product}
    uintx HeapSizePerGCThread                       = 87241520                            {product}
    uintx InitialHeapSize                          := 33554432                            {product}
    uintx LargePageHeapSizeThreshold                = 134217728                           {product}
    uintx MaxHeapSize                              := 536870912                           {product}
     intx ThreadStackSize                           = 1024                                {pd product}
     intx VMThreadStackSize                         = 1024                                {pd product}
openjdk version "1.8.0_212"
OpenJDK Runtime Environment (IcedTea 3.12.0) (Alpine 8.212.04-r0)
OpenJDK 64-Bit Server VM (build 25.212-b04, mixed mode)

我錯了，有人可以幫我解釋一下如何設定軟管值嗎？

uj5u.com熱心網友回復：

我看到你使用 OpenJDK Alpine 來部署一個 JAVA 應用程式，所以你需要使用這個環境“ JAVA_TOOL_OPTIONS ”而不是“ JAVA_OPTS ”，例如：

spec:
  containers:
  - name: jvm_options
    image: xxx:xxx
    env:
    - name: JAVA_TOOL_OPTIONS
      value: "-Xmx768m -XX:MaxMetaspaceSize=256m"

一旦您的應用程式運行，您可以查看應用程式日志，您將在下面找到日志：

Picked up JAVA_TOOL_OPTIONS: -Xmx768m -XX:MaxMetaspaceSize=256m

uj5u.com熱心網友回復：

為此，您可以在容器部分下使用命令和引數。例如：

      containers:
      - name: test
        image: test:latest
        command: ["java"]
        args: ["-Xms256m","-Xmx768m","-jar","/app.jar"]

uj5u.com熱心網友回復：

@Vincent Chan 的 1 回答它很有魅力，感謝您在此處提供的幫助輸出：

- name: JAVA_TOOL_OPTIONS
              value: "-Xmx1536m -XX:MaxMetaspaceSize=1024m"

運行 kubectl exec 后

java -XshowSettings:vm -version
Picked up JAVA_TOOL_OPTIONS: -Xmx1536m -XX:MaxMetaspaceSize=1024m
VM settings:
    Max. Heap Size (Estimated): 1.45G
    Ergonomics Machine Class: server
    Using VM: OpenJDK 64-Bit Server VM

openjdk version "1.8.0_212"
OpenJDK Runtime Environment (IcedTea 3.12.0) (Alpine 8.212.04-r0)
OpenJDK 64-Bit Server VM (build 25.212-b04, mixed mode)

bash-4.4$ java -XX: PrintFlagsFinal -version | grep -iE 'HeapSize|PermSize|ThreadStackSize|MaxMetaspaceSize'
Picked up JAVA_TOOL_OPTIONS: -Xmx1536m -XX:MaxMetaspaceSize=1024m
     intx CompilerThreadStackSize                   = 0                                   {pd product}
    uintx ErgoHeapSizeLimit                         = 0                                   {product}
    uintx HeapSizePerGCThread                       = 87241520                            {product}
    uintx InitialHeapSize                          := 50331648                            {product}
    uintx LargePageHeapSizeThreshold                = 134217728                           {product}
    uintx MaxHeapSize                              := 1610612736                          {product}
    uintx MaxMetaspaceSize                         := 1073741824                          {product}
     intx ThreadStackSize                           = 1024                                {pd product}
     intx VMThreadStackSize                         = 1024                                {pd product}
openjdk version "1.8.0_212"
OpenJDK Runtime Environment (IcedTea 3.12.0) (Alpine 8.212.04-r0)
OpenJDK 64-Bit Server VM (build 25.212-b04, mixed mode)

標籤：爪哇 Kubernetes

上一篇：在Kubernetes中使用TrustedPlatform模塊

下一篇：Ingress遷移流程