blocks|key|4436299|text|如果您正在使用docker-compose，您可以将这些标志添加到docker-compose.yml|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4436300|app:
++tty:+true
++stdin_open:+true|code-block|syntax|javascript|4436301|然后使用docker+attach+project_app_1附加到您的进程。pry-rails现在在这里工作。确保您的容器上安装了less，以获得最佳的撬动体验。|4436302|请参阅https://github.com/docker/compose/issues/423#issuecomment-141995398|4436303|entityMap|0|LINK|mutability|MUTABLE|url|https://github.com/docker/compose/issues/423#issuecomment-141995398^0|X|I|0|0|4|R|13|9|1U|4|0|3|1V|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|H|7|Z|8|@]|D|@]|E|$I|J]]|$1|K|3|L|5|6|7|10|8|@$9|11|A|12|B|C]|$9|13|A|14|B|C]|$9|15|A|16|B|C]]|D|@]|E|$]]|$1|M|3|N|5|6|7|17|8|@]|D|@$9|18|A|19|1|1A]]|E|$]]|$1|O|3|-4|5|6|7|1B|8|@]|D|@]|E|$]]]|P|$Q|$5|R|S|T|E|$U|V]]]]

If you're using docker-compose, you can add these flags to <code>docker-compose.yml</code>:

<pre><code>app:
 tty: true
 stdin_open: true
</code></pre>

And then attach to your process with <code>docker attach project_app_1</code>. <code>pry-rails</code> works here now. Ensure <code>less</code> is installed on your container for the optimal pry experience.

cf. <a href="https://github.com/docker/compose/issues/423#issuecomment-141995398" rel="noreferrer">https://github.com/docker/compose/issues/423#issuecomment-141995398</a>

blocks|key|4436474|text|要使用pry，您必须以不同的方式运行它：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4436475|docker-compose+run+--service-ports+web|offset|length|style|CODE|4436476|查看这篇文章以了解更多信息：|4436477|http://blog.carbonfive.com/2015/03/17/docker-rails-docker-compose-together-in-your-development-workflow/|4436478|entityMap|0|LINK|mutability|MUTABLE|url^0|0|0|12|0|0|0|2W|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@$D|U|E|V|F|G]]|9|@]|A|$]]|$1|H|3|I|5|6|7|W|8|@]|9|@]|A|$]]|$1|J|3|K|5|6|7|X|8|@]|9|@$D|Y|E|Z|1|10]]|A|$]]|$1|L|3|-4|5|6|7|11|8|@]|9|@]|A|$]]]|M|$N|$5|O|P|Q|A|$R|K]]]]

to use pry you have to run it differently:

<code>docker-compose run --service-ports web</code>

check out this article for more info:

<a href="http://blog.carbonfive.com/2015/03/17/docker-rails-docker-compose-together-in-your-development-workflow/" rel="noreferrer">http://blog.carbonfive.com/2015/03/17/docker-rails-docker-compose-together-in-your-development-workflow/</a>

blocks|key|4436443|text|当我在Passenger中运行窥探时也遇到了同样的问题。尝试将Gemfile中的"pry-rails"更改为gem+"pry-remote"，这将启动一个dRuby或无依赖项的分布式协议。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4436444|当您想要停止执行中的代码时，调用"binding.remote_pry"而不是"binding.pry"|4436445|然后在控制台中调用remote-pry即可访问。它应该是一样的。在您的测试环境中，通常的binding.pry就可以正常工作。|4436446|entityMap^0|14|B|1I|G|0|G|K|13|D|0|9|A|18|B|0^^$0|@$1|2|3|4|5|6|7|L|8|@$9|M|A|N|B|C]|$9|O|A|P|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Q|8|@$9|R|A|S|B|C]|$9|T|A|U|B|C]]|D|@]|E|$]]|$1|H|3|I|5|6|7|V|8|@$9|W|A|X|B|C]|$9|Y|A|Z|B|C]]|D|@]|E|$]]|$1|J|3|-4|5|6|7|10|8|@]|D|@]|E|$]]]|K|$]]

I had this same issue when I was running pry in Passenger. Try changing <code>"pry-rails"</code> in the Gemfile to <code>gem "pry-remote"</code>, which will initiate a dRuby, or distributed protocol with no dependencies. 

Where you want to stop the code in execution call <code>"binding.remote_pry"</code> as opposed to <code>"binding.pry"</code>

Then just call <code>remote-pry</code> in the console to access it. It should work the same. In your test environment just the usual <code>binding.pry</code> works fine.

blocks|key|4436347|text|但是，如果您不使用docker-compose，则可以简单地使用-it选项来运行容器。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4436348|例如：|4436349|docker+run+-v+/Users/adam/Documents/Rails/Blog/:/usr/src/app+-p+3000:3000+-it+blog|code-block|syntax|javascript|4436350|entityMap^0|9|E|W|3|0|0|0^^$0|@$1|2|3|4|5|6|7|O|8|@$9|P|A|Q|B|C]|$9|R|A|S|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|T|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|U|8|@]|D|@]|E|$K|L]]|$1|M|3|-4|5|6|7|V|8|@]|D|@]|E|$]]]|N|$]]

If you don't use <code>docker-compose</code> though, you can simply run the container with <code>-it</code> option. 

For example:

<pre><code>docker run -v /Users/adam/Documents/Rails/Blog/:/usr/src/app -p 3000:3000 -it blog
</code></pre>

blocks|key|4436598|text|如果你是在高山linux，也就是ruby-*-alpine下运行，你需要安装包含infocmp的ncurses包。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|4436599|如果这是您在错误日志中记录以下内容的原因：|4436600|bin/rails:+No+such+file+or+directory+-+infocmp++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
Error:+undefined+method+`split'+for+nil:NilClass+
...
bin/rails:4:in+`<main>'+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
FATAL:+Pry+failed+to+get+user+input+using+`Readline`.+++++++++++++++++++++++++++++++++++++++++++++++++++++++
To+fix+this+you+may+be+able+to+pass+input+and+output+file+descriptors+to+pry+directly.+e.g.++++++++++++++++++++++++++++++++++++
++Pry.config.input+=+STDIN+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++Pry.config.output+=+STDOUT+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
++binding.pry++++|code-block|syntax|javascript|4436601|要解决此问题，请在您的Dockerfile上添加：|4436602|RUN+apk+add+ncurses|4436603|尽管您可能已经有一行apk+add代码，因此只需在其中添加ncurses即可。|4436604|然后你可以这样做|4436605|entityMap^0|G|D|14|7|0|0|0|B|A|0|0|A|7|T|7|0|0^^$0|@$1|2|3|4|5|6|7|W|8|@$9|X|A|Y|B|C]|$9|Z|A|10|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|11|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|13|8|@$9|14|A|15|B|C]]|D|@]|E|$]]|$1|O|3|P|5|J|7|16|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|17|8|@$9|18|A|19|B|C]|$9|1A|A|1B|B|C]]|D|@]|E|$]]|$1|S|3|T|5|6|7|1C|8|@]|D|@]|E|$]]|$1|U|3|-4|5|6|7|1D|8|@]|D|@]|E|$]]]|V|$]]

If you are running in under alpine linux aka <code>ruby-*-alpine</code> you need to install package ncurses wich includes <code>infocmp</code>.
If that's the reason you will have this in your error log:
<pre><code>bin/rails: No such file or directory - infocmp 
Error: undefined method `split' for nil:NilClass 
...
bin/rails:4:in `&lt;main&gt;' 
FATAL: Pry failed to get user input using `Readline`. 
To fix this you may be able to pass input and output file descriptors to pry directly. e.g. 
 Pry.config.input = STDIN 
 Pry.config.output = STDOUT 
 binding.pry 
</code></pre>
To fix it, on your <code>Dockerfile</code> add:
<pre><code>RUN apk add ncurses
</code></pre>
Although You probably already had an <code>apk add</code> line, so just add <code>ncurses</code> there.
then you can do

I have a rails app running in a docker container in development environment.

When I try to debug it with placing <code>binding.pry</code> somewhere in the code and attaching to the container I can see the <code>pry</code> prompt in the output but it doesn't pause on it and I can't interact with it like it was without docker container.

So how do I debug a containerized app?

How to debug a rails app in docker with pry?

33 天实现自己的 AI 进化论？发文瓜分机械键盘、耳机等万元奖池！点击参加活动：<a href="https://cloud.tencent.com/developer/article/2503022" target="_blank">https://cloud.tencent.com/developer/article/2503022</a> 
 <img src="https://qcloudimg.tencent-cloud.cn/raw/01543e0407db10898a7ee9f420794432.jpg"/>

技术创作特训营有奖征文

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

腾讯云架构师技术同盟交流圈

腾讯云数据库专区

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AI代码助手

CODING DevOps

Cloud Studio

SDK中心

API中心

命令行工具

文章&问答评论现已支持表情

我在开发环境中有一个运行在docker容器中的rails应用程序。当我尝试通过在代码中的某处放置binding.pry并附加到容器来调试它时，我可以在输出中看到pry提示符，但它不会暂停，我也不能像没有docker容器时那样与它交互。那么我该如何调试一个容器化的应用呢？

问如何使用pry在docker中调试rails应用？
EN

回答 5

Stack Overflow用户

Stack Overflow用户

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

问如何使用pry在docker中调试rails应用？EN

回答 5

Stack Overflow用户

Stack Overflow用户

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

问如何使用pry在docker中调试rails应用？
EN