Domain > jameshunt.us

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Whois

Property	Value
Name	James Hunt
Email	filefrog@gmail.com
Address	4011 N Monroe Ave
Zip Code	61616
City	Peoria Heights
State	Illinois
Country	US
Phone	+1.3092310934
NameServer	NS2.LINODE.COM
Created	2011-07-08 06:59:57
Changed	2015-07-08 15:17:34
Expires	2017-07-07 23:59:59
Registrar	GODADDY.COM, INC.

DNS Resolutions

Date	IP Address
2025-01-08	45.79.253.139 (ClassC)

HTTP/1.1 200 OKServer: nginx/1.19.8Date: Wed, 08 Jan 2025 15:38:23 GMTContent-Type: text/htmlContent-Length: 7759Connection: keep-aliveLast-Modified: Sun, 03 Apr 2022 21:40:40 GMTETag: 624a1458-1e4fExpires: Thu, 08 Jan 2026 15:38:23 GMTCache-Control: max-age31536000Cache-Control: public, no-transformAccept-Ranges: bytesX-Proxied-For: jameshunt.us

!DOCTYPE html>html langen>head>meta charsetUTF-8>meta charsetUTF-8>title>jameshunt(.us) | thoughts on technology, containers, & software/title>meta propertyog:title contentjameshunt(.us) | thoughts on technology, containers, & software>meta nameviewport contentwidthdevice-width,initial-scale1>link relshortcut icon href/i/nu.gif>link relalternate typeapplication/atom+xml href/feeds/main>link relalternate typeapplication/json href/feeds/json>meta namegenerator contentverse/2.0>meta namereferrer contentorigin-when-cross-origin>meta namedescription contentMusings on technical topics, from containers to virtualization, and everywhere in between.  This is my personal site, filled with personal thoughts, opinions, tirades, and ramblings.>meta propertyog:description contentMusings on technical topics, from containers to virtualization, and everywhere in between.  This is my personal site, filled with personal thoughts, opinions, tirades, and ramblings.>meta propertyog:description contentMusings on technical topics, from containers to virtualization, and everywhere in between.  This is my personal site, filled with personal thoughts, opinions, tirades, and ramblings.>meta propertyog:image contenthttps://new.jameshunt.us/34a1f42d66cce3a771559c0f6df6580e16070461.jpg>meta propertyog:site_name contentjames hunt (.us)>meta nameauthor contentJames Hunt>link relstylesheet href/s/main.css mediascreen>link relpreload asstyle onloadthis.onloadnull;this.relstylesheet href/s/font.css mediascreen>/head>body>header>https://new.jameshunt.us/header>nav>span>a href/>home/a>/span>span>a href/writings/>writings/a>/span>span>a relnooperner hrefhttps://github.com/jhunt target_blank>code/a>/span>span>a href/feeds/main>atom/a>/span>/nav>div idpage>div classtier1 article>h1>a relmore href/writings/dont-just-develop-for-docker/>Don’t Just Develop FOR Dockerspan classsubtitle>Develop WITH It/span>/a>span classdated>Jan 3 2022/span>/h1>article>p>/p>p>A lot of words get written about how Docker revolutionizes delivery of the em>output/em> of the software development process. Without a doubt, containers-as-super-packages are phenomenally useful for wrapping up binaries with configuration files, helper programs, shared libraries, and language runtimes. I’m not here to talk about that today./p>p>No, I want to talk about how I use Docker while writing software–and how you can too!/p>h2>Pulling in Libraries/h2>p>Here’s a Dockerfile that makes my life easier when I’m working in Perl:/p>pre>code>FROM ubuntu:20.04RUN apt-get update \ && apt-get install -y carton \ && rm -rf /var/lib/apt/listsWORKDIR /appCOPY cpanfile .RUN carton install# start here when you figure out how to run the Perl-y thing.../code>/pre>p>Here’s what I do for Common Lisp work:/p>pre>code>FROM ubuntu:20.04RUN apt-get update \ && apt-get install -y sbcl \ && rm -rf /var/lib/apt/listsADD https://beta.quicklisp.org/quicklisp.lisp /tmp# start here when you figure out how to run the Lisp-y thing.../code>/pre>p>These “partial images” contain the seeds of a real production deployment, but one that can be used to incrementally develop the software em>in the same environment/em>./p>p>It gets even more interesting when we start relying on libraries that are em>outside/em> of the purview of the language libraries themselves; usually because they are written in C. For example, if I add code>hunchentoot/code>, a pure-Lisp HTTP server, to my Common Lisp project, it will pull in code>ironclad/code>, for TLS capabilities, which depends on OpenSSL./p>p>To accommodate, I just have to amend the code>apt-get install/code> command from this:/p>pre>code>RUN apt-get update \ && apt-get install -y sbcl \ && rm -rf /var/lib/apt/lists/code>/pre>p>to this:/p>pre>code>RUN apt-get update \ && apt-get install -y sbcl libssl-dev \ && rm -rf /var/lib/apt/lists/code>/pre>h2>Surrounding Infrastructure/h2>p>Who builds an application that doesn’t handle data? I usually need either a Redis cluster, a PostgreSQL instance, or at least a persistent file system to keep stuff around in between application server reboots. For that, I use Docker Compose and off-the-shelf images./p>p>For example, the other day I was building a content-addressable blob store based on SHA-3 hashing. Blobs live in files under the file system, named after the checksum of their contents. I also needed the ability to group blobs arbitrarily (via tags) and store keyed metadata (file size, original file name, etc.). Metadata lives in a PostgreSQL relational database./p>p>To spin everything up reliably, I wrote a Compose recipe. Here it is:/p>pre>code>version: 3services:  db:    image: postgres    environment:      POSTGRES_PASSWORD: sekrit    volumes:      ./_/pg:/var/lib/postgresql/pgdata      ./schema.sql:/docker-entrypoint-initdb.d/10-schema.sql  api:    build:      context: .    environment:      DB_HOST: db    volumes:      - ./_/store:/store      - ./api:/app:ro    ports:      - 7000:7000/code>/pre>p>I get two things out of this: (1) a persistent database, and (2) a place to execute code in a REPL (this is a Common Lisp project). Should I want to start over, I can drop the containers, wipe the persistent storage directory (code>_/code>) and start it back up again:/p>pre>code>$ docker-compose down$ sudo rm -rf _$ docker-compose up -d/code>/pre>h2>Faster Iteration/h2>p>A major advantage Lisps have over other languages is the utility of the REPL–an interactive top-level expression evaluator. With a spinning code>api/code> container, I can access the REPL and play around with code as it evolves:/p>pre>code>$ docker exec -it the_api_1 sbclThis is SBCL 2.0.1.debian, an implementation of ANSI Common Lisp.More information about SBCL is available at http://www.sbcl.org/>.SBCL is free software, provided as is, with absolutely no warranty.It is mostly in the public domain; some portions are provided underBSD-style licenses.  See the CREDITS and COPYING files in thedistribution for more information.* (+ 1 2 3)6/code>/pre>p>This is handy, because it allows me to edit files outside of the container (The code>./api:/app/code> volume mount does that), while still relying on em>in situ/em> execution, evaluation, and exploration./p>/article>/div>h1>Like That?  Try These:/h1>div classtier2 article>h1>a relmore href/writings/early-memories-of-computers/>Early Memories of Computers/a>/h1>/div>div classtier2 article>h1>a relmore href/writings/joining-vivanti/>Consulting: Empowerment & Championing/a>/h1>/div>div classtier3 article>h1>a relmore href/writings/scanning-books/>Scanning Books/a>/h1>/div>div classtier3 article>h1>a relmore href/writings/silly-docker-tricks/>Silly Docker Tricks/a>/h1>/div>div classtier3 article>h1>a relmore href/writings/x11-clipboard-management-foibles/>Managing the X11 Clipboardspan classdeco>— or —/span>span classsubtitle>Area Hacker Finds One Weird Trick For Persistent Copy / Paste Behavior/span>/a>/h1>/div>div classtier3 article>h1>a relmore href/writings/dockerless-docker-with-runc/>Dockerless Docker with Runcspan classdeco>— or —/span>span classsubtitle>Lose the Daemon; Keep the Containers/span>/a>/h1>/div>/div>footer>Copyright © 2012-2022 James Huntbr>a relnooperner hrefhttps://github.com/jhunt target_blank>github/a>/footer>/body>/html>

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