November 2024

Replacing batteries Eaton 5PX – 5PX2200RT & 5PXEBM48RT

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NOTE: the images in this blog post were broken. As of 2024-12-01 1600 UTC, they are fixed. Sorry about that. Two useful links for future me: https://caniuse.com/?search=HEIC https://urlscan.io/result/31b29ced-bf41-415c-994e-df6ec532cb29/ The time arrived this morning. The batteries were charged up. I had most of the day to myself. It was time to replace the batteries. Elapsed time for this process, according to the photos I took, was about 90 minutes. However, looking at snmpd metrics, […]

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Optimizing UPS power use when the power goes out

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This post is mostly for myself. I’m just putting my Sunday morning thoughts down for later review and consideration. When Selecting replacements batteries for my Eaton 5PX UPS (5PX2200RT & 5PXEBM48RT), I began to think about: when the power goes off, why can’t I keep using my laptop? Usually, I still have an Internet connection: the ISP isn’t going offline. Why not turn off the two servers in the basement, and anything else

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Selecting replacements batteries for my Eaton 5PX UPS (5PX2200RT & 5PXEBM48RT)

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Both nut and Nagios are telling me: replace my batteries. Fair enough. The UPS (5PX2200RT) and the external battery pack (5PXEBM48RT) were installed and configured with nut four years and two months ago. It’s time. Usually, I buy compatible third party batteries. Looking at video and images, I’m seeing these units use batteries in a pre-packaged plastic shell. I posted to the nut users mailing list and received some fantastic replies. The best

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Loading up an old copy of a PostgreSQL database, zfs snapshots, and sanoid snapshot management

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Sometimes you want to go back to a known good state. And you want to do it quickly, without waiting around. In my case, that’s going to be a zfs snapshot. Today I am preparing to test some code changes so that FreshPorts properly creates a new category. See these recent blog posts for details: Welcome to the new category: filesystems Fixing the category creation code In this post: FreeBSD 14.1-RELEASE-p5 postgresql16-server-16.4 dbclone

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zfs hold / release

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Let’s talk about zfs hold. Based on man zfs-hold: “If a hold exists on a snapshot, attempts to destroy that snapshot by using the zfs destroy command return EBUSY.” Let’s apply that to some FreshPorts snapshots which I don’t want going away: This is your typical FreshPorts website: [15:03 dvl-nginx01 dvl ~] % zfs list NAME USED AVAIL REFER MOUNTPOINT data02 1.13T 565G 96K none data02/freshports 671G 565G 88K none data02/freshports/jailed 326G 565G

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dma: could not pick up queue file

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see https://lists.freebsd.org/archives/freebsd-questions/2024-October/005877.html for the full archive. A while back, I changed my FreeBSD jails from using postfix to using dma. I like postfix, but I don’t want to maintain the app in so many locations. dma is less work. I wrote a short blog post about configuring dma and also blogged about replacing postfix with dma. All was well. Except this one log entry which I started to see, on some hosts, not

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