Category: Tech

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I’ve been thinking about what it means to self-host a service, and that there are degrees even within that.

I have a self-hosted WordPress blog in the sense that I manage an installation of WordPress, but I run it on a VPS at a web host. It’s not as self-hosted as someone running a server on a Lollipop Cloud or FreedomBox, but it’s more self-hosted than someone using WordPress.com. It’s also more self-hosted than someone using the managed WordPress hosting at the same web host.

The key advantages of self-hosting are privacy and control. Unless a service uses end-to-end encryption, the admins at each level can probably read your stuff – you have to trust that they won’t do it unless they have to.

And of course when you run your own service, you don’t have to fear losing control when Google Plus shuts down, or Flickr changes their pricing structure, or Tumblr changes their TOS, or MySpace botches a server migration.

The obvious disadvantage of self-hosting, of course, is that you’re on the hook for all the maintenance. Spam filtering, moderation, security updates, server migrations – those are all on you.

And unless you’re using your own software, even on your own box there’s still the risk that a project is going to shut down & leave you without security fixes, or pivot to a new direction that no longer fits what you want. (So glad WP’s block editor is still optional!)

I’ve settled on a balance where I manage the top-level web apps, but my webhost handles the hardware, the virtualization and the LAMP stack. (And email. Ugh, I’d forgotten how much of a pain a mailserver can be to handle until I tried to set one up on a Raspberry Pi a couple of months ago.)

I guess I’m kind of splitting the difference. 🤷

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Huge swaths of orange in a night sky view that wraps around the constellation Orion.
Photo by Andrew Klinger via Astronomy Picture of the Day

The first time I saw a picture of Barnard’s Loop (the arc running through Orion), I was astonished at the scale of it in the sky. I always had it in my head that (aside from the Milky Way, anyway), most of the astronomical features we see in photos are not just too faint but too small to see with the naked eye. The fact that I could instantly see the scale, because it wraps through a constellation I know, really drove home the fact that a lot of features don’t need telescopes, just long exposures. (And the right film/sensors and filters.)

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Purism’s explanations for removing various safety features from Librem One’s social network sound like someone explaining why they removed the mirrors, brakes, horns, seat belts, airbags and signals from the cars they’re reselling, because they know those cars are only ever going to be driven on a track where they’ll never have to change lanes or negotiate with other drivers.

Even though there’s a bunch of driveways on that track, connecting to the public road system.

If a collision does happen, we can call in the tow trucks and ambulances. But giving drivers tools to avoid collisions or reduce injuries? That would be interfering with their freedom!

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Wow, that shoe dropped sooner than I expected. Verizon is already shopping around to sell Tumblr. I figured it would be toward the end of the year, not the middle.

After Tumblr’s ham-handed ban on adult content last fall purged a bunch of accounts, sparked a lack of confidence, and triggered an wave of users leaving in digust, it became clear that Verizon had no idea what to do with Tumblr (not that Yahoo! had much more). If they hadn’t already started the death spiral, they’d at least knocked it out of orbit.

I’ve never been super-active on Tumblr, but I interact with a few people, and I used to occasionally post things there that weren’t reposts from my blog, or Flickr, or Instagram, or wherever. So, just in case, I backed up a full archive, imported some of the original posts, and pared down all the old duplicates and outdated signal boosts so that when Verizon inevitably gave up monetizing the site, it would be easier to find the pieces I wanted to keep.

Honestly, I’d rather Verizon sell it than shutter it and sell off the data (you think Verizon wouldn’t?). But it depends on who buys it. If anyone wants it.

Here’s hoping Tumblr finds a suitable buyer who understands what they’re getting and is willing to invest in the community, not someone who just wants to squeeze out the last few drops of cash before sending it to join GeoCities in the great Internet Archive in the Sky.

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I’m thinking about social media backups again after Prismo lost all its data, and after one of my own test blogs crashed.

I can and do automate backups on the VPS where I host my main blogs.

I can manually backup my social media accounts, but IIRC none of them offer automatic scheduling. I have to remember to run a backup, log into the site, find the right control panel (which sometimes changes!) and request a backup.

I’d like to be able to schedule recurring backups on Mastodon, Twitter, etc. Send me an email each month with a link when it’s ready.

OK, you don’t want to keep generating backups for abandoned accounts. Here are some ideas:

  • Skip the process if I haven’t posted since the last archive.
  • Instead of scheduling a recurring job, schedule a new one 30 days out each time I download an archive.

Refine as needed.

Now, those of us with a little more tech savvy can automate some things with IFTTT. Not the native backup process, but we can set up rules to listen for new posts and automatically save the content somewhere else. But while I can reliably save the text of every post from Twitter, Mastodon, etc., saving media depends on what I’m saving it to. Often the best you can do with IFTTT is embed, not copy. (And that’s if the media is even available in the source feed. Pixelfed’s RSS doesn’t include image URLs, and Mastodon’s RSS/Atom includes them in a way IFTTT doesn’t recognize.)

Eh, maybe I should just read up on ActivityPub and see if I can make a subscribe-to-archive bot.

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Sometimes you choose which social app to open based on

  • who you want to talk to
  • who you want to hear
  • what you want to talk about

Sometimes you’re just shouting into the void. At those times, I figure I’ll choose the void that feels less exploitative.

That’s part of why I still have a blog. And why I post more on Mastodon, while Twitter is mostly auto-shares from my other networks, retweets, and occasional cross-posts.

(And politics, because I’d rather keep that on Twitter, where it’s sort of the main topic anyway, than on the network that’s still fun. Not that Mastodon is apolitical. Far from it! But it’s a lot more varied than the overwhelming focus on US partisan politics I see on Twitter. And the culture and structure make the discussions at least somewhat less train-wrecky. Most of the time.)

Update: If you’re interested in checking out Mastodon and the Fediverse, good places to start are JoinMastodon.org and JoinFediverse.wiki.

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An orange ring in the blackness of space

How cool is it that we now have an actual image of the event horizon of a black hole! More precisely: it’s the glowing accretion disc of matter falling into the black hole, and the event horizon’s silhouette.

The Event Horizon Telescope, actually a worldwide array of telescopes, used interferometry to effectively create a planet-sized telescope to see the light around the supermassive black hole at the center of M87, a galaxy 55 million light years away.

I remember talking with a college classmate about giant interferometry telescopes back in the late 1990s. It’s incredible to see the technique actually making discoveries like this!

What we’re seeing in this image isn’t a top-down view of the accretion disc, but an angled one — think of Saturn’s rings — and the gravity of the black hole is bending the light from the disc. Phil Plait has a great article on the science behind the image. Katie Mack has a Twitter thread on how the image was produced, why the ring looks the way it does (it tells us which direction the disc is spinning!), plus simulations of this type of black hole seen from different viewing angles.

Here’s a paper talking about the history of black hole images, with a detailed discussion of what you should expect for the “shadow” image we’ve just seen. Check Fig 12, with renderings of shadows for disks at different angles arxiv.org

4x4 grid of black circles with red/yellow outlines, with bright and dark spots in the outlines.

— Katie Mack (@AstroKatie) April 10, 2019

Direct links to the articles she mentions:

And this Mastodon thread by @SohKamYung@mstdn.io collects some more articles worth checking out:

Forbes makes the excellent point that, while we’d seen a lot of circumstantial evidence for black holes over the last few decades, this confirms that they exist.

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