Question

我通过Kubernetes部署Redis容器并收到以下警告：

警告您在内核中启用了透明大页（THP）支持。这将导致Redis的延迟和内存使用问题。要解决此问题，请运行命令＆＃39; echo never＆gt; / SYS /内核/毫米/ transparent_hugepage /启用＆＃39;以root用户身份将其添加到/etc/rc.local中，以便在重新启动后保留设置。禁用THP后必须重新启动Redis

是否可以通过Kubernetes禁用THP？也许是通过init-containers？

Answer 1

是的，使用init-containers，它非常简单：

apiVersion: v1
kind: Pod
metadata:
  name: thp-test
spec:
  restartPolicy: Never
  terminationGracePeriodSeconds: 1
  volumes:
    - name: host-sys
      hostPath:
        path: /sys
  initContainers:
    - name: disable-thp
      image: busybox
      volumeMounts:
        - name: host-sys
          mountPath: /host-sys
      command: ["sh", "-c", "echo never >/host-sys/kernel/mm/transparent_hugepage/enabled"]
  containers:
    - name: busybox
      image: busybox
      command: ["cat", "/sys/kernel/mm/transparent_hugepage/enabled"]

演示（请注意，这是系统范围的设置）：

$ ssh THATNODE cat /sys/kernel/mm/transparent_hugepage/enabled
always [madvise] never
$ kubectl create -f thp-test.yaml
pod "thp-test" created
$ kubectl logs thp-test
always madvise [never]
$ kubectl delete pod thp-test
pod "thp-test" deleted
$ ssh THATNODE cat /sys/kernel/mm/transparent_hugepage/enabled
always madvise [never]

Answer 2

哎，

我不知道我做了什么是个好主意，但我们需要在所有K8S虚拟机上为所有应用停用THP。所以我使用DaemonSet而不是在我们所有的堆栈中添加一个init-container：

apiVersion: apps/v1
kind: DaemonSet
metadata:
  name: thp-disable
  namespace: kube-system
spec:
  selector:
    matchLabels:
      name: thp-disable
  template:
    metadata:
      labels:
        name: thp-disable
    spec:
      restartPolicy: Always
      terminationGracePeriodSeconds: 1
      volumes:
        - name: host-sys
          hostPath:
            path: /sys
      initContainers:
        - name: disable-thp
          image: busybox
          volumeMounts:
            - name: host-sys
              mountPath: /host-sys
          command: ["sh", "-c", "echo never >/host-sys/kernel/mm/transparent_hugepage/enabled"]
      containers:
        - name: busybox
          image: busybox
          command: ["watch", "-n", "600", "cat", "/sys/kernel/mm/transparent_hugepage/enabled"]

我觉得它有点脏但是有效。

禁用Kubernetes的透明大页面

2 个答案: