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Category Archive for 'Uncategorized'

Hacking a Peeple

A common tactic for a burglary or casing a home is to send somebody unconcealed to the front door posing as a survey taker, lost pet owner, or some such and seeing if anyone is at home. If nobody answers it’s probably a sign that there’s nobody around and proceed. Outdoor video cameras on the […]

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My colleague Matthew gave a presentation about bare metal provisioning servers at Facebook on IPv6-only networks at SREcon last month. He discusses the entire process from why we went v6-only, selection of DHCP server and network boot loaders, through installing CentOS on hosts, and all of the gotchas along the way. By audience survey it […]

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It turns out my SuperMicro A1SAI boards made a fucking liar out of me. I bitched and moaned it was 2016 and they didn’t support UEFI PXE booting despite supporting UEFI, but they do. I just didn’t know where to look. Under “PCIe/PCI/PNP Configuration” in boot setup, the “Launch Storage OpROM Policy” and “Launch Network OpROM […]

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If you have Mellanox ConnectX-3 or ConnectX-4 NICs in your servers, I discovered it’s possible to do IPv6 OS installations via PXE. FlexBoot is their on-board PXE implementation that ships on their NICs and it’s based on iPXE. It turns out that as of FlexBoot version 3.4.718 from January 2016 they’ve added beta IPv6 support. […]

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ASRock Rack C2550D4I motherboard

I wanted a new Avoton motherboard for my OpenIndiana home NAS with lots of on-board SATA so I could use the PCIe slot for a 10-gigabit NIC. I needed seven SATA ports, six for the data disks and one for the OS drive. The standard mini-ITX configuration seems to max out at six, and I […]

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  The Anaconda 19 (now v21) installer in RHEL 7 / CentOS 7 is a great improvement over Anaconda 13 that was used in CentOS 6. Among other fixes it was completely overhauled along the way. One thing lacking in CentOS 6 was the ability to perform an automatic kickstart installation over an IPv6-only network. […]

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Equipment teardowns

A quick list of equipment tear downs and photographs I’ve done for people who are interested in the internals: Comtrend CT-5374 DSL modem+router Ubiquiti EdgeRouter-X Ubiquiti EdgeRouter Lite (ERL3) including how to replace USB memory stick MikroTik CRS226-24G-2S+RM switch SGI Fuel

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For the longest time I wondered why Chrome would never save the password of my Ubiquiti UniFi controllers’ web interfaces. It turns out because the UniFi controller software ships out of the box with a self-signed SSL/TLS cert that’s untrusted, Chrome does a smart thing and won’t prompt you to save the password for the […]

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Speed!

My old dedicated server is quite old and ass slow. I finally got around to moving my website elsewhere running Nginx+HHVM, and now it’s tolerable once again! I can finally enforce 100% https without killing the CPU.

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June rocks

June was such an exciting month and the good news over summer keeps getting better: People finally wise up and take down the Confederate flag (the “rebel flag” where I grew up) The US Supreme Court allows gay marriage (whether or not they hijacked diplomacy is another thing) ESA’s Philae comet lander makes contact with Rosetta […]

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