Perfect solution to Docker Alpine image time zone problem

Recently, when I was using Docker to deploy a Java application, I found that the time zone was wrong. Using JDK to get the current time was 8 hours slower than the standard time zone.

Solution:

Solution 1. Modify Dockerfile

Set the time zone of the Alpine Linux system. Find the documentation of Alpine Linux and learn that the time zone can be set through the tzdata package. When building the Docker image, add this sentence to the Dockerfile:

RUN apk --update add tzdata && \
    cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && \
    echo "Asia/Shanghai" > /etc/timezone && \
    apk del tzdata && \
    rm -rf /var/cache/apk/*

Complete Dockerfile

FROM openjdk:8-jre-alpine3.9

RUN apk --update add tzdata && \
    cp /usr/share/zoneinfo/Asia/Shanghai /etc/localtime && \
    echo "Asia/Shanghai" > /etc/timezone && \
    apk del tzdata && \
    rm -rf /var/cache/apk/*

# copy the packaged jar file into our docker image
COPY application.jar /application.jar

Document link:

wiki.alpinelinux.org/wiki/Setting…

Solution 2. Set the JVM's system default time zone

When starting the Docker image, set the time zone by setting the user.timezone JVM environment variable

java -jar -Duser.timezone=Asia/Shanghai app.jar

Solution 3. Mount the host machine’s time zone file into the Docker container

The cluster solution uses K8S. When deploying, mount the host's time zone file into the Docker container.

apiVersion: apps/v1
kind: Deployment
metadata:
  name: SERVICE_NAME
spec:
  replicas: 1
  selector:
    matchLabels:
      app: SERVICE_NAME
  template:
    metadata:
      labels:
        app: SERVICE_NAME
    spec:
      containers:
      - name: SERVICE_NAME
        image: IMAGE_TAG
        imagePullPolicy: Always
        ports:
        - containerPort: 80
      	volumeMounts:
        - name: tz-config
          mountPath: /etc/localtime
      volumes:
      - name: tz-config
        hostPath:
           path: /etc/localtime

Check if it is running normally

date -R

Reference Documents:

quaded.com/docker-apli…

blog.csdn.net/jeikerxiao/…

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