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K8S修改Pod時(shí)間方案詳細(xì)代碼實(shí)例

更新時(shí)間：2025年08月21日 10:35:06 作者：SixSixzero

在Kubernetes中,修改Pod的時(shí)間通常指的是修改Pod的時(shí)區(qū)設(shè)置,因?yàn)镻od的時(shí)間戳（如創(chuàng)建時(shí)間）是由Kubernetes集群管理的,并且通常不建議直接修改,這篇文章主要介紹了K8S修改Pod時(shí)間方案的相關(guān)資料,需要的朋友可以參考下

需求：

不修改宿主系統(tǒng)時(shí)間前提下，只修改Pod 或容器進(jìn)程時(shí)間。

方案：

本地部署faketime
部署fake-time-injector 插件
對(duì)Pod新增sidecar （比較靈活）

本地部署faketime：

1. 部署 faketime （所有節(jié)點(diǎn)）

yum install faketime -y

2. yaml文件添加對(duì)應(yīng)環(huán)境

apiVersion: v1
kind: Pod
metadata:
  name: fake-time-pod
spec:
  containers:
  - name: app
    image: registry.cn-hangzhou.aliyuncs.com/acs/testc:v1
    env:
    - name: LD_PRELOAD
      value: /usr/lib64/faketime/libfaketime.so.1 
    - name: FAKETIME
      value: "+2y"  # 設(shè)置為未來(lái)2年，使用"-2y"表示過(guò)去2年
    volumeMounts:
    - name: faketime-lib
      mountPath: /usr/lib64/faketime 
  volumes:
  - name: faketime-lib
    hostPath:
      path: /usr/lib64/faketime

部署fake-time-injector 插件

vi fake-time-injector.yaml,新增以下內(nèi)容

apiVersion: v1
kind: ServiceAccount
metadata:
  name: fake-time-injector-sa
  namespace: kube-system
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRole
metadata:
  name: fake-time-injector-cr
rules:
  - apiGroups: [""]
    resources: ["pods"]
    verbs: ["get", "list", "patch", "update", "watch"]
  - apiGroups: [""]
    resources: ["secrets"]
    verbs: ["get", "list"]
  - apiGroups: ["admissionregistration.k8s.io"]
    resources: ["mutatingwebhookconfigurations"]
    verbs: ["get", "list", "watch", "create", "update", "patch", "delete"]
---
apiVersion: rbac.authorization.k8s.io/v1
kind: ClusterRoleBinding
metadata:
  name: fake-time-injector-rb
subjects:
  - kind: ServiceAccount
    name: fake-time-injector-sa
    namespace: kube-system
roleRef:
  kind: ClusterRole
  name: fake-time-injector-cr
  apiGroup: rbac.authorization.k8s.io
---
apiVersion: apps/v1
kind: Deployment
metadata:
  name: kubernetes-faketime-injector
  namespace: kube-system
  labels:
    app: kubernetes-faketime-injector
spec:
  replicas: 1
  selector:
    matchLabels:
      app: kubernetes-faketime-injector
  template:
    metadata:
      labels:
        app: kubernetes-faketime-injector
    spec:
      containers:
        - image: registry-cn-hangzhou.ack.aliyuncs.com/acs/fake-time-injector:v5     #  使用 fake-time-injector/Dockerfile 構(gòu)建鏡像
          imagePullPolicy: Always
          name: kubernetes-faketime-injector
          resources:
            limits:
              cpu: 100m
              memory: 100Mi
            requests:
              cpu: 100m
              memory: 100Mi
          env:
            - name: CLUSTER_MODE     # CLUSTER_MODE為true時(shí)，命名空間內(nèi)的所有pod在一定時(shí)間范圍內(nèi)(40s)啟動(dòng)時(shí)獲得一致的偏移量
              value: "true"
            - name: Namespace_Delay_Timeout     # 命名空間內(nèi)的所有pod在一定時(shí)間范圍內(nèi)(120s)啟動(dòng)時(shí)獲得一致的偏移量, 默認(rèn)值為40s.
              value: "120"
            - name: LIBFAKETIME_PLUGIN_IMAGE
              value: "registry.cn-hangzhou.aliyuncs.com/acs/libfaketime:v1"
            - name: FAKETIME_PLUGIN_IMAGE
              value: "registry-cn-hangzhou.ack.aliyuncs.com/acs/fake-time-sidecar:v4.1"   # 使用 fake-time-injector/plugins/faketime/build/Dockerfile 創(chuàng)建鏡像
      serviceAccountName:  fake-time-injector-sa
---
kind: Service
apiVersion: v1
metadata:
  name: kubernetes-faketime-injector
  namespace: kube-system
spec:
  ports:
    - port: 443
      targetPort: 443
      name: webhook
  selector:
    app: kubernetes-faketime-injector

kubectl apply -f fake-time-injector.yaml

對(duì)Pod修改時(shí)間方式：

libfaketime

apiVersion: v1
kind: Pod
metadata:
  name: test
  labels:
    app: myapp
    version: v1
#  namespace: test
  annotations:
    cloudnativegame.io/fake-time-rate: "1.0"  # 時(shí)間流逝速率（1.0=正常速度）
    cloudnativegame.io/fake-time: "-10d" # 初始時(shí)間（支持絕對(duì)時(shí)間或相對(duì)偏移，如 +3h/-7h）
    cloudnativegame.io/fake-time-enabled: "true"  # 確保時(shí)間模擬功能完全激活
    cloudnativegame.io/time-source: "incremental" # 指定增量時(shí)間源
spec:
  containers:
    - name: test
      image: registry.cn-hangzhou.aliyuncs.com/acs/testc:v1
      volumeMounts:
        - name: host-timezone
          mountPath: /etc/localtime  # 掛載宿主機(jī)時(shí)區(qū)文件
          readOnly: true             # 只讀模式確保安全
  volumes:
    - name: host-timezone
      hostPath:
        path: /etc/localtime  # 宿主機(jī)時(shí)區(qū)文件路徑
        type: File            # 明確指定資源類(lèi)型為文件

結(jié)果：

watchmaker

apiVersion: v1
kind: Pod
metadata:
  name: testpod
  labels:
    app: myapp
    version: v1
  annotations:
    cloudnativegame.io/process-name: "hello"     # 如果需要同時(shí)修改多個(gè)進(jìn)程用`,`隔開(kāi)進(jìn)程名即可
    cloudnativegame.io/fake-time: "2030-01-01 00:00:00"     # 此處還可以配置調(diào)整的秒數(shù)，'86400'表示時(shí)間向后漂移一天，watchmaker不支持過(guò)去的時(shí)間。
spec:
  containers:
    - name: myhello
      image: registry.cn-hangzhou.aliyuncs.com/acs/hello:v1 
      env:
        - name: Modify_Sub_Process        # Modify_Sub_Process為true時(shí),同時(shí)修改子進(jìn)程的時(shí)間。
          value: "true"

進(jìn)入容器查看時(shí)間

結(jié)果：

采用sidecar方式

即Pod 新增一個(gè)修改時(shí)間的容器

apiVersion: v1
kind: Pod
metadata:
  labels:
    name: hello
  name: hello
spec:
  containers:
    - image: 'registry.cn-hangzhou.aliyuncs.com/acs/hello:v1'
      imagePullPolicy: IfNotPresent
      name: myhello
    - env:
        - name: modify_process_name
          value: hello               # 如果需要同時(shí)修改多個(gè)進(jìn)程用`,`隔開(kāi)進(jìn)程名即可
        - name: delay_second
          value: '86400'
      image: 'registry-cn-hangzhou.ack.aliyuncs.com/acs/fake-time-sidecar:v4.1'
      imagePullPolicy: Always
      name: fake-time-sidecar
  shareProcessNamespace: true

問(wèn)題1：

同namespace下多個(gè)pod 同時(shí)啟動(dòng)時(shí)，可能會(huì)相互影響

podA 時(shí)間設(shè)定是：+2y , podB 時(shí)間設(shè)定是 -10d

那么有可能 podA 和podB 都是 -10d 或者都是 -2y

kubectl apply -f nginx.yaml & kubectl apply -f test.yaml

解決方案：

1.延遲啟動(dòng) （具體延遲多久根據(jù)fake-time-injector 配置的時(shí)間）

2.劃分命名空間（不推薦）

3.修改fake-time-injector

4.采用sidecar方式

修改fake-time-injector：

方案一中部署的fake-time-injector插件，其中需要修改CLUSTER_MODE 和Namespace_Delay_Timeout

問(wèn)題2：

時(shí)間設(shè)定問(wèn)題，

絕對(duì)偏移量如"2024-12-01 12:00:00" 時(shí)間凍結(jié)這個(gè)時(shí)間點(diǎn)，不會(huì)變動(dòng)。

相對(duì)偏移量如"'+3h'或者'-20m'" ，時(shí)間會(huì)變動(dòng) 只能針對(duì)一個(gè)時(shí)間單位修改，

如 +7h -20m +30s -1y 不能 -1y10d 7h20m 這種形式。

# 可以下載faketime 單獨(dú)嘗試。 faketime -f '-7h' date 查看效果

絕對(duì)偏移量：cloudnativegame.io/fake-time: "2024-12-01 12:00:00"

apiVersion: v1
kind: Pod
metadata:
  name: nginx
  annotations:
    cloudnativegame.io/fake-time-rate: "1.0"  # 時(shí)間流逝速率（1.0=正常速度）
    cloudnativegame.io/fake-time: "2024-12-01 12:00:00" # 初始時(shí)間（支持絕對(duì)時(shí)間或相對(duì)偏移，如 +3h/-7h）
    cloudnativegame.io/fake-time-enabled: "true"  # 確保時(shí)間模擬功能完全激活
    cloudnativegame.io/time-source: "incremental" # 指定增量時(shí)間源
spec:
  containers:
  - name: my-container
    image: nginx
    resources:
      requests:
        cpu: "0.1"
        memory: "50Mi"
      limits:
        cpu: "1"
        memory: "100Mi"
    volumeMounts:
      - name: host-timezone
        mountPath: /etc/localtime  # 掛載宿主機(jī)時(shí)區(qū)文件
        readOnly: true             # 只讀模式確保安全
  volumes:
    - name: host-timezone
      hostPath:
        path: /etc/localtime  # 宿主機(jī)時(shí)區(qū)文件路徑
        type: File            # 明確指定資源類(lèi)型為文件

相對(duì)偏移量：

只會(huì)識(shí)別最后的單位以及數(shù)字

apiVersion: v1
kind: Pod
metadata:
  name: nginx
  annotations:
    cloudnativegame.io/fake-time-rate: "1.0"  # 時(shí)間流逝速率（1.0=正常速度）
    cloudnativegame.io/fake-time: "+2y10d2h" # 初始時(shí)間（支持絕對(duì)時(shí)間或相對(duì)偏移，如 +3h/-7h20m）           
    cloudnativegame.io/fake-time-enabled: "true"  # 確保時(shí)間模擬功能完全激活
    cloudnativegame.io/time-source: "incremental" # 指定增量時(shí)間源
spec:
  containers:
  - name: my-container
    image: nginx
    resources:
      requests:
        cpu: "0.1"
        memory: "50Mi"
      limits:
        cpu: "1"
        memory: "100Mi"
    volumeMounts:
      - name: host-timezone
        mountPath: /etc/localtime  # 掛載宿主機(jī)時(shí)區(qū)文件
        readOnly: true             # 只讀模式確保安全
  volumes:
    - name: host-timezone
      hostPath:
        path: /etc/localtime  # 宿主機(jī)時(shí)區(qū)文件路徑
        type: File            # 明確指定資源類(lèi)型為文件