k8s1.12以上版本设置LXCFS

SY小站

发布于 2020-06-15 11:47:35

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发布于 2020-06-15 11:47:35

文章被收录于专栏：SY小站的专栏SY小站的专栏

1. 前言

上一篇文章，我们介绍了，k8s1.12之前的版本怎么使用lxcfs，k8s1.12以下版本设置LXCFS。

先说下为什么需要使用lxcfs，首先容器获取不到真实内存与cpu，假设一个宿主机是384G内存的服务器，容器java应用配置了jvm参数，配额4G，但是堆内存确是按照了384G去分，这样产生的后果就会很大了。

lxcfs的挂载有很多方式，可以podpreset，直接挂载等，下面我们来介绍下怎么直接挂载。

2. 使用k8s Daemonsets设置lxcfs

apiVersion: apps/v1beta2
kind: DaemonSet
metadata:
  name: lxcfs
  namespace: default
  labels:
    app: lxcfs
spec:
  selector:
    matchLabels:
      app: lxcfs
  template:
    metadata:
      labels:
        app: lxcfs
    spec:
      hostPID: true
      tolerations:
      - key: node-role.kubernetes.io/master
        effect: NoSchedule
      containers:
      - name: lxcfs
        image: registry.cn-hangzhou.aliyuncs.com/denverdino/lxcfs:3.0.4
        imagePullPolicy: Always
        securityContext:
          privileged: true
        volumeMounts:
        - name: cgroup
          mountPath: /sys/fs/cgroup
        - name: lxcfs
          mountPath: /var/lib/lxcfs
          mountPropagation: Bidirectional
        - name: usr-local
          mountPath: /usr/local
      volumes:
      - name: cgroup
        hostPath:
          path: /sys/fs/cgroup
      - name: usr-local
        hostPath:
          path: /usr/local
      - name: lxcfs
        hostPath:
          path: /var/lib/lxcfs
          type: DirectoryOrCreate

3. 例子

apiVersion: apps/v1
kind: Deployment
metadata:
  annotations:
    "initializer.kubernetes.io/lxcfs": "true"
  labels:
    app: web
  name: web
spec:
  replicas: 1
  selector:
    matchLabels:
      app: web
  template:
    metadata:
      labels:
        app: web
    spec:
      containers:
        - name: web
          image: httpd:2.4.32
          volumeMounts:
            - name: cpuinfo
              mountPath: /proc/cpuinfo
            - name: meminfo
              mountPath: /proc/meminfo
            - name: diskstats
              mountPath: /proc/diskstats
            - name: stat
              mountPath: /proc/stat
            - name: swaps
              mountPath: /proc/swaps
            - name: uptime
              mountPath: /proc/uptime
          imagePullPolicy: Always
          resources:
            requests:
              memory: "1024Mi"
              cpu: "100m"
            limits:
              memory: "1024Mi"
              cpu: "100m"

      volumes:
      - name: cpuinfo
        hostPath:
          path: /var/lib/lxcfs/proc/cpuinfo
          type: File
      - name: meminfo
        hostPath:
          path: /var/lib/lxcfs/proc/meminfo
          type: File
      - name: diskstats
        hostPath:
          path: /var/lib/lxcfs/proc/diskstats
          type: File
      - name: stat
        hostPath:
          path: /var/lib/lxcfs/proc/stat
          type: File
      - name: swaps
        hostPath:
          path: /var/lib/lxcfs/proc/swaps
          type: File
      - name: uptime
        hostPath:
          path: /var/lib/lxcfs/proc/uptime
          type: File

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原始发表：2020-06-08，如有侵权请联系 cloudcommunity@tencent.com 删除

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