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An old DOS BBS in a Docker container
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======
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Awhile back, I wrote about [my Debian Docker base images][1]. I decided to extend this concept a bit further: to running DOS applications in Docker.
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But first, a screenshot:
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![][2]
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It turns out this is possible, but difficult. I went through all three major DOS emulators available (dosbox, qemu, and dosemu). I got them all running inside the Docker container, but had a number of, er, fun issues to resolve.
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The general thing one has to do here is present a fake modem to the DOS environment. This needs to be exposed outside the container as a TCP port. That much is possible in various ways -- I wound up using tcpser. dosbox had a TCP modem interface, but it turned out to be too buggy for this purpose.
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The challenge comes in where you want to be able to accept more than one incoming telnet (or TCP) connection at a time. DOS was not a multitasking operating system, so there were any number of hackish solutions back then. One might have had multiple physical computers, one for each incoming phone line. Or they might have run multiple pseudo-DOS instances under a multitasking layer like [DESQview][3], OS/2, or even Windows 3.1.
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(Side note: I just learned of [DESQview/X][4], which integrated DESQview with X11R5 and [replaced the Windows 3 drivers][5] to allow running Windows as an X application).
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For various reasons, I didn't want to try running one of those systems inside Docker. That left me with emulating the original multiple physical node setup. In theory, pretty easy -- spin up a bunch of DOS boxes, each using at most 1MB of emulated RAM, and go to town. But here came the challenge.
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In a multiple-physical-node setup, you need some sort of file sharing, because your nodes have to access the shared message and file store. There were a myriad of clunky ways to do this in the old DOS days - [Netware][6], [LAN manager][7], even some PC NFS clients. I didn't have access to Netware. I tried the Microsoft LM client in DOS, talking to a Samba server running inside the Docker container. This I got working, but the LM client used so much RAM that, even with various high memory tricks, BBS software wasn't going to run. I couldn't just mount an underlying filesystem in multiple dosbox instances either, because dosbox did caching that wasn't going to be compatible.
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This is why I wound up using dosemu. Besides being a more complete emulator than dosbox, it had a way of sharing the host's filesystems that was going to work.
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So, all of this wound up with this: [jgoerzen/docker-bbs-renegade][8].
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I also prepared building blocks for others that want to do something similar: [docker-dos-bbs][9] and the lower-level [docker-dosemu][10].
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As a side bonus, I also attempted running this under Joyent's Triton (SmartOS, Solaris-based). I was pleasantly impressed that I got it all almost working there. So yes, a Renegade DOS BBS running under a Linux-based DOS emulator in a container on a Solaris machine.
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--------------------------------------------------------------------------------
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via: http://changelog.complete.org/archives/9836-an-old-dos-bbs-in-a-docker-container
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作者：[John Goerzen][a]
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译者：[译者ID](https://github.com/译者ID)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://changelog.complete.org/archives/author/jgoerzen
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[1]:https://changelog.complete.org/archives/9794-fixing-the-problems-with-docker-images
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[2]:https://raw.githubusercontent.com/jgoerzen/docker-bbs-renegade/master/renegade-login.png
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[3]:https://en.wikipedia.org/wiki/DESQview
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[4]:http://toastytech.com/guis/dvx.html
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[5]:http://toastytech.com/guis/dvx3.html
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[6]:https://en.wikipedia.org/wiki/NetWare
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[7]:https://en.wikipedia.org/wiki/LAN_Manager
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[8]:https://github.com/jgoerzen/docker-bbs-renegade
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[9]:https://github.com/jgoerzen/docker-dos-bbs
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[10]:https://github.com/jgoerzen/docker-dosemu
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Docker 容器中的老式 DOS BBS
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======
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不久前，我写了一篇[我的 Debian Docker 基本映像][1]。我决定进一步扩展这个概念：在 Docker 中运行 DOS 程序。
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但首先，一张截图：
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![][2]
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事实证明这是可能的，但很难。我使用了所有三种主要的 DOS 模拟器（dosbox、qemu 和 dosemu）。我让它们都能在 Docker 容器中运行，但有很多有趣的问题需要解决。
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普遍要做的事是在 DOS 环境下提供一个伪造的调制解调器。这需要作为 TCP 端口暴露在容器外部。这有很多方法可以做到 - 我使用的是 tcpser结。dosbox 有一个 TCP 调制解调器接口，但事实证明，这样做太问题太多了。
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挑战来自你希望能够一次接受多个传入 telnet（或 TCP）连接。DOS 不是一个多任务操作系统，所以当时有很多 hack 的方法。一种是有多台物理机，每个有一根传入电话线。或者它们可能会在 [DESQview][3]、OS/2 甚至 Windows 3.1 等多任务层下运行多个伪 DOS 实例。
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（注意：我刚刚了解到 [DESQview/X][4]，它将 DESQview 与 X11R5 集成在一起，并[取代了 Windows 3 驱动程序][5]来使 Windows 作为 X 应用程序运行。）
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出于各种原因，我不想尝试在 Docker 中运行其中一个系统。这让我模拟了原来的多物理节点设置。从理论上讲，非常简单 - 运行一组 DOS 实例，每个实例最多使用 1MB 的模拟 RAM，这就行了。但是这里面临挑战。
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在多物理节点设置中，你需要某种文件共享，因为你的节点需要访问共享消息和文件存储。在老式的 DOS 时代，有很多笨重的方法可以做到这一点 - [Netware][6]、[LAN manager][7]，甚至一些 PC NFS 客户端。我没有访问 Netware。我尝试了 DOS 中的 Microsoft LM 客户端，与在 Docker 容器内运行的 Samba 服务器交互。这样可以使用，但 LM 客户端即使有各种高内存技巧还是占用了很多内存，BBS 软件也无法运行。我无法在多个 dosbox 实例中挂载底层文件系统，因为 dosbox 缓存不兼容。
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这就是为什么我使用 dosemu 的原因。除了有比 dosbox 更完整的模拟器之外，它还有一种共享主机文件系统的方式。
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所以, 所有这一切都在此：[jgoerzen/docker-bbs-renegade][8]。
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我还为其他想做类似事情的人准备了构建块：[docker-dos-bbs][9] 和底层 [docker-dosemu][10]。
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意外的收获是，我也试图在 Joyent 的 Triton（基于 Solaris 的 SmartOS）下运行它。让我感到高兴的印象是，这几乎可以在这下工作。是的，在 Solaris 机器上在一个基于 Linux 的 DOS 模拟器的容器中运行 Renegade DOS BBS。
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--------------------------------------------------------------------------------
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via: http://changelog.complete.org/archives/9836-an-old-dos-bbs-in-a-docker-container
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作者：[John Goerzen][a]
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]:http://changelog.complete.org/archives/author/jgoerzen
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[1]:https://changelog.complete.org/archives/9794-fixing-the-problems-with-docker-images
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[2]:https://raw.githubusercontent.com/jgoerzen/docker-bbs-renegade/master/renegade-login.png
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[3]:https://en.wikipedia.org/wiki/DESQview
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[4]:http://toastytech.com/guis/dvx.html
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[5]:http://toastytech.com/guis/dvx3.html
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[6]:https://en.wikipedia.org/wiki/NetWare
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[7]:https://en.wikipedia.org/wiki/LAN_Manager
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[8]:https://github.com/jgoerzen/docker-bbs-renegade
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[9]:https://github.com/jgoerzen/docker-dos-bbs
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[10]:https://github.com/jgoerzen/docker-dosemu
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