If You Need Lifeboats, That Means Your Ship is Sinking

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It’s 1912 and Captain Edward Smith is boarding the RMS Titanic. He sees the lifeboats on deck and shakes his head with a heavy sigh before turning to the crew. “In my experience, I’ve never needed lifeboats. They’re not best practices — if you need lifeboats, that means your ship is sinking!” The crew members are enlightened and eagerly throw all lifeboats overboard. The Titanic begins its voyage to New York.

Switching from StartSSL to Let's Encrypt

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When I first set up this blog I got an SSL certificate from StartCom’s StartSSL authority, simply because it was the easy way to just get a site on HTTPS.

However, StartCom has recently fallen out of favour with browser vendors, starting with Mozilla and now Chrome. If you haven’t been following the world of certificate authority politics, the story starts with a CA called WoSign. A university sysadmin created a big tech news story earlier this year after revealing that WoSign gave him a certificate for github.com. This is a pretty big deal, and Mozilla’s investigations into WoSign have raised even more concerns about WoSign’s mistakes and handling of mistakes. One of those concerns is this:

[In November 2015] WoSign purchased the CA “StartCom” and did not disclose the transaction as a change of ownership, which we believe violates section 5 of the Mozilla CA Certificate Maintenance Policy. Furthermore, when this clause was brought to their attention, they denied that any changes fell under it, and they attempted to suppress further information about the ownership transfer when it was brought to the community’s attention.

A couple of weeks ago Mozilla announced that Firefox will be phasing out support for both WoSign and StartCom certificates. Chrome made a similar announcement a week later.

A Quick and Hacky Way to Serve a Git Repo over HTTP

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More and more development tools are supporting git repository URLs as a way of pointing to code or data. That’s convenient if you’re working with a mature, third-party repository that’s already hosted, but it means that sometimes you just need a quick way to serve a repo over a web interface for experimental work.

Offline Compression with Nginx

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There’s a clear tradeoff with compressing HTTP responses on the fly: compress “harder” and you’ll (hopefully) get a smaller file that takes less time to send over the network – but the net benefit might be negative if the extra work takes too much time, or (when under heavy load) too much CPU. A lot of work has been done analysing this tradeoff, but for static content there’s a neat and simple way to avoid the tradeoff completely: compress offline before serving. Nginx supports this using the gzip_static module.

Turning any Live CD ISO into a Live USB with Writable Storage Partitions

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Here’s a guide to installing a bootable CD-ROM ISO image as a bootable partition on a (USB) drive, while using other partitions as normal filesystems. The most complicated part is partitioning and formatting the drive, which is well documented elsewhere, but I didn’t see anyone else explaining exactly how to do this trick.