将shell放入Heroku dyno上运行的Docker容器中。怎么样？ [英] Shell into a Docker container running on a Heroku dyno. How?

问题描述

给定一个运行容器的dyno，什么是Heroku相当于 docker exec -it blarg / bin / bash ？也就是说，如何在已经运行的容器中打开shell？

示例Dockerfile：

  FROM heroku / heroku：16 
 CMD true;做睡1;完成
  

运行示例：

  $ heroku container：push my_app 
<等一分钟> 
 $ heroku ps 
 === my_app（Free）：/ bin / sh -c while\ true\; \ do\ sleep\ 1\; \ done（1） 
 my_app.1：up 2017/10/09 12:13:07 -0600（〜4m ago）
  

到目前为止好。

但现在...

  $ heroku ps：exec --dyno = my_app.1 
建立凭证...错误
▸无法连接到dyno！ 
▸检查dyno是否在运行'heroku ps'
  

heroku ps 在这一点上，它表明测功机仍在运行。

是的，我已经完成了所有Heroku建议启用Docker支持。根据文档，我已经尝试使用我选择的基础映像，同时确保 bash ， curl ， openssh 和 python 都存在。我也尝试使用Heroku-16基本镜像，如上例所示。

（链接的文档还引用了Private Spaces所需的步骤。没有使用私人空间我没有应用这些步骤。）

解决方案

TL; DR确保 bash 安装在映像中，并将其添加到Dockerfile中：

pre $ RUN rm / bin / sh& &安培; ln -s / bin / bash / bin / sh


解释 p>

与文档相反会让人相信，Heroku并不支持开箱即用，支持 heroku ps：exec 到一个已经在dyno中运行的Docker容器中。

引用我从Heroku团队收到的回复：

我们的ps：exec特性...作品...通过向dynos注入bash文件，
在后台打开一个额外的端口，并允许您
连接到它。

Docker使用的默认
shell是/ bin / sh，它与
Heroku Exec脚本不兼容（它需要/ bin / bash）。

尽管您可以使用一种解决方法。将以下内容放入您的
Dockerfile中：

$ b

RUN rm / bin / sh&& ln -s / bin / bash / bin / sh

这绝对是我们产品的
差距，我们会努力做到这一点。

Given a dyno in which a container is running, what's the Heroku equivalent of docker exec -it blarg /bin/bash? That is, how can one open a shell into the already-running container?

Example Dockerfile:

FROM heroku/heroku:16
CMD while true; do sleep 1; done

Example run:

$ heroku container:push my_app
<wait a minute>
$ heroku ps
=== my_app (Free): /bin/sh -c while\ true\;\ do\ sleep\ 1\;\ done (1) 
my_app.1: up 2017/10/09 12:13:07 -0600 (~ 4m ago)

So far so good.

But now...

$ heroku ps:exec --dyno=my_app.1
Establishing credentials... error
 ▸    Could not connect to dyno!
 ▸    Check if the dyno is running with `heroku ps'

For good measure I check heroku ps at this point and it shows that the dyno is still running.

Yes, I've done all the things Heroku suggests to enable Docker support. Per the documentation, I have tried using a base image of my choice while ensuring that bash, curl, openssh, and python are present. I have also tried using the Heroku-16 base image, as shown in the above example.

(The linked documentation also references steps required for Private Spaces. Since I'm not using Private Spaces I have not applied those steps.)

解决方案

TL;DR Ensure that bash is installed in the image and add this to your Dockerfile:

RUN rm /bin/sh && ln -s /bin/bash /bin/sh

Explanation

Contrary to what the documentation would lead one to believe, Heroku does not, out of the box, support heroku ps:exec into a Docker container already running in a dyno.

Quoting from responses I have received from the Heroku team:

Our ps:exec feature ... works ... by injecting a bash file into dynos, opening an additional port in the background, and allowing you to connect to it.

[T]he default shell used by Docker is /bin/sh, which is not compatible with the Heroku Exec script (it's requires /bin/bash).

There is a workaround you can use though. Put the following in your Dockerfile:

RUN rm /bin/sh && ln -s /bin/bash /bin/sh

This is definitely a gap in our product, and we'll work to make this better.

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