blocks|key|9737|text|这在Docker中是不可能的。Docker使用与外部内核相同的时钟。您需要的是完全虚拟化，它模拟一台完整的PC。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|9738|sudo失败是因为它只会让您对容器内的虚拟环境执行root操作。该用户与主机系统的真实root无关(除了通过名称和UID)，并且它不能执行真实root可以执行的操作。|offset|length|style|CODE|9739|如果您使用Python或Java这样的高级语言，您通常会有一些钩子，您可以在其中模拟测试的特定系统时间，或者编写代码，包装“从系统获取当前时间”并返回测试所需的内容。|9740|特别针对Java，使用joda-time。在那里你可以使用DateTimeUtils.setCurrentMillis*()注入你自己的时间源。|9741|entityMap^0|0|0|4|P|4|17|4|1Z|4|0|0|T|X|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|O|8|@$D|P|E|Q|F|G]|$D|R|E|S|F|G]|$D|T|E|U|F|G]|$D|V|E|W|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|X|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|Y|8|@$D|Z|E|10|F|G]]|9|@]|A|$]]|$1|L|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|M|$]]

That's not possible with Docker. Docker uses the same clock as the outside kernel. What you need is full virtualization which emulates a complete PC.
The <code>sudo</code> fails because it only makes you <code>root</code> of the virtual environment inside of the container. This user is not related to the real <code>root</code> of the host system (except by name and UID) and it can't do what the real <code>root</code> could do.
If you use a high level language like Python or Java, you often have hooks where you can simulate a certain system time for tests or you can write code which wraps &quot;get current time from system&quot; and returns what your test requires.
Specifically for Java, use joda-time. There you can inject your own time source using <code>DateTimeUtils.setCurrentMillis*()</code>.

blocks|key|9761|text|在Docker容器中动态更改时间是非常有可能的，而不会影响主机操作系统。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|9762|解决方法就是伪造它。This+lib拦截用于检索当前时间和日期的所有系统调用程序。|offset|length|9763|实现起来很简单。根据需要向Dockerfile添加功能：|9764|WORKDIR+/
RUN+git+clone+https://github.com/wolfcw/libfaketime.git
WORKDIR+/libfaketime/src
RUN+make+install|code-block|syntax|javascript|9765|请记住，在运行要应用伪造时间的应用程序之前，要设置环境变量LD_PRELOAD。|style|CODE|9766|示例：|9767|CMD+["/bin/sh",+"-c",+"LD_PRELOAD=/usr/local/lib/faketime/libfaketime.so.1+FAKETIME_NO_CACHE=1+python+/srv/intercept/manage.py+runserver+0.0.0.0:3000]|9768|现在，您可以动态更改服务器时间：|9769|9770|def+set_time(request):
++++import+os
++++import+datetime
++++print(datetime.datetime.today())
++++os.environ["FAKETIME"]+=+"2020-01-01"++#++string+must+be+"YYYY-MM-DD+hh:mm:ss"+or+"%2B15d"
++++print(datetime.today())|9771|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/wolfcw/libfaketime^0|0|A|8|0|0|0|0|T|A|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|17|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|18|8|@]|9|@$D|19|E|1A|1|1B]]|A|$]]|$1|F|3|G|5|6|7|1C|8|@]|9|@]|A|$]]|$1|H|3|I|5|J|7|1D|8|@]|9|@]|A|$K|L]]|$1|M|3|N|5|6|7|1E|8|@$D|1F|E|1G|O|P]]|9|@]|A|$]]|$1|Q|3|R|5|6|7|1H|8|@]|9|@]|A|$]]|$1|S|3|T|5|J|7|1I|8|@]|9|@]|A|$K|L]]|$1|U|3|V|5|6|7|1J|8|@]|9|@]|A|$]]|$1|W|3|R|5|6|7|1K|8|@]|9|@]|A|$]]|$1|X|3|Y|5|J|7|1L|8|@]|9|@]|A|$K|L]]|$1|Z|3|-4|5|6|7|1M|8|@]|9|@]|A|$]]]|10|$11|$5|12|13|14|A|$15|16]]]]

It is very much possible to dynamically change the time in a Docker container, without effecting the host OS. 

The solution is to fake it. <a href="https://github.com/wolfcw/libfaketime" rel="noreferrer">This lib</a> intercepts all system call programs use to retrieve the current time and date. 

The implementation is easy. Add functionality to your Dockerfile as appropriate: 

<pre><code>WORKDIR /
RUN git clone https://github.com/wolfcw/libfaketime.git
WORKDIR /libfaketime/src
RUN make install
</code></pre>

Remember to set the environment variables <code>LD_PRELOAD</code> before you run the application you want the faked time applied to. 

Example: 

<pre><code>CMD ["/bin/sh", "-c", "LD_PRELOAD=/usr/local/lib/faketime/libfaketime.so.1 FAKETIME_NO_CACHE=1 python /srv/intercept/manage.py runserver 0.0.0.0:3000]
</code></pre>

You can now dynamically change the servers time:

Example: 

<pre><code>def set_time(request):
 import os
 import datetime
 print(datetime.datetime.today())
 os.environ["FAKETIME"] = "2020-01-01" # string must be "YYYY-MM-DD hh:mm:ss" or "+15d"
 print(datetime.today())
</code></pre>

blocks|key|4517441|text|我创建了一个包含libfaketime的Docker镜像，用于Alpine，但该过程可以在其他发行版中完成。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4517442|下面是一个使用Groovy的Java使用它的示例。但是Tomcat也可以使用。|4517443|FROM+groovy:alpine
COPY+--from=trajano/alpine-libfaketime++/faketime.so+/lib/faketime.so
ENV+LD_PRELOAD=/lib/faketime.so+\
++++DONT_FAKE_MONOTONIC=1|code-block|syntax|javascript|4517444|然后在执行docker运行时构建并传递FAKETIME环境变量，例如|offset|length|style|CODE|4517445|docker+build+-f+fakedemo-java.Dockerfile+.+-t+fakedemo
docker+run+--rm+-e+FAKETIME=%2B15d+fakedemo+groovy+-e+"print+new+Date();"|4517446|源文件在trajano+/+alpine-libfaketime+%7C+Github中，docker镜像文件在trajano/alpine-libfaketime+%7C+dockerhub+中|4517447|我还创建了一个基于Ubuntu的变体：trajano+/+ubuntu-faketime+%7C+Github|4517448|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/trajano/alpine-libfaketime|1|https://hub.docker.com/r/trajano/alpine-libfaketime|2|https://github.com/trajano/ubuntu-faketime^0|0|0|0|J|8|0|0|4|11|0|1I|13|1|0|J|Y|2|0^^$0|@$1|2|3|4|5|6|7|16|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|17|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|18|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|19|8|@$K|1A|L|1B|M|N]]|9|@]|A|$]]|$1|O|3|P|5|F|7|1C|8|@]|9|@]|A|$G|H]]|$1|Q|3|R|5|6|7|1D|8|@]|9|@$K|1E|L|1F|1|1G]|$K|1H|L|1I|1|1J]]|A|$]]|$1|S|3|T|5|6|7|1K|8|@]|9|@$K|1L|L|1M|1|1N]]|A|$]]|$1|U|3|-4|5|6|7|1O|8|@]|9|@]|A|$]]]|V|$W|$5|X|Y|Z|A|$10|11]]|12|$5|X|Y|Z|A|$10|13]]|14|$5|X|Y|Z|A|$10|15]]]]

I created a Docker image containing libfaketime for use with Alpine but the process can be done in other distributions.
Here's an example of using it Java using Groovy as an example. But Tomcat can be used as well.
<pre><code>FROM groovy:alpine
COPY --from=trajano/alpine-libfaketime /faketime.so /lib/faketime.so
ENV LD_PRELOAD=/lib/faketime.so \
 DONT_FAKE_MONOTONIC=1
</code></pre>
Then build and pass the <code>FAKETIME</code> environment variable when doing a docker run for example
<pre><code>docker build -f fakedemo-java.Dockerfile . -t fakedemo
docker run --rm -e FAKETIME=+15d fakedemo groovy -e &quot;print new Date();&quot;
</code></pre>
Source is in <a href="https://github.com/trajano/alpine-libfaketime" rel="noreferrer">trajano
/
alpine-libfaketime | Github</a> and the docker image is in <a href="https://hub.docker.com/r/trajano/alpine-libfaketime" rel="noreferrer">trajano/alpine-libfaketime | dockerhub
</a>
I also created a variant of it based on Ubuntu: <a href="https://github.com/trajano/ubuntu-faketime" rel="noreferrer">trajano
/
ubuntu-faketime | Github</a>

blocks|key|9873|text|docker+exec+-it+[Container+Id]+/bin/bash+(执行到容器中)|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|9874|rm+/etc/localtime+(请参阅时区)|9875|ln+-s+/usr/share/zoneinfo/Asia/Karachi+/etc/localtime+(设置新时区)|9876|entityMap^0|0|14|0|0|H|0|0|1H|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|O|8|@$9|P|A|Q|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|R|8|@$9|S|A|T|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|U|8|@]|D|@]|E|$]]]|K|$]]

<code>docker exec -it [Container Id] /bin/bash</code> (exec into container)
<code>rm /etc/localtime</code> (see time zone)
<code>ln -s /usr/share/zoneinfo/Asia/Karachi /etc/localtime</code> (set new time zone)

I have a container with a running program inside tomcat. I need to change date only in this container and test my program behaviour. I have time sensitive logic, and sometimes need to see what happens in a few days or months later.
Is it possible in docker? I read that if I change date in container, date will get changed on the host system. But it is a bad idea for me. I need to have a few instances of this application on one server and have possibilities of setting up different time for each instance.

But when I try to change date inside the container I get the error:

<pre><code>sudo date 04101812
date: cannot set date: Operation not permitted
Fri Apr 10 18:12:00 UTC 2015
</code></pre>

Is it possible change date in docker container?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

文章

问答

视频

学习中心

腾讯云实验室

直播

竞赛

腾讯云代码分析专区

腾讯iOA零信任安全管理系统专区

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

腾讯云顾问专区

腾讯云原生专区

腾讯混元专区

腾讯云TCE专区

腾讯云Lighthouse专区

腾讯云HAI专区

腾讯云Edgeone专区

腾讯云存储专区

腾讯云智能专区

腾讯轻联专区 

腾讯云开发专区

TAPD专区

腾讯轻量云游戏服专区

腾讯云最具价值专家

腾讯云架构师技术同盟

腾讯云创作之星

腾讯云开发者先锋 

腾讯云代码助手

CODING DevOps

Cloud Studio

SDK中心

API中心

命令行工具

我有一个容器，在tomcat里面有一个正在运行的程序。我只需要在这个容器中更改日期，并测试我的程序行为。我有时间敏感的逻辑，有时需要看看几天或几个月后会发生什么。在码头可以吗？我读到，如果我在容器中更改日期，那么主机系统上的日期也会更改。但这对我来说不是个好主意。我需要在一个服务器上有这个应用程序的几个实例，并有可能为...

问码头集装箱中可能有变更日期吗？
EN

Stack Overflow用户

社区

活动

圈层

关于

腾讯云开发者

热门产品

热门推荐

更多推荐

问码头集装箱中可能有变更日期吗？EN