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Cake day: July 17th, 2023

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  • I second the advice to switch to a different/previous/known good kernel. That has been the cause a most boot problems for me. I just had it happen on a VM a couple of weeks ago, so I switched to the old kernel, then removed the new kernel. I’ll wait for another kernel before upgrading.

    It’s probably worth scanning your disk just in case as well.






  • Be wary of RAID 5 or 6.

    They both have a « write hole » problem (or though much less so in RAID 6). Any power failure which causes an incomplete write can cause a complete RAID corruption - meaning all data is lost. Hardware RAID controllers usually have an onboard backup battery so they can store some information to complete operations should there be a sudden power failure. Software RAID does not have this, and you need to provide a UPS with automatic clean shutdown as the battery runs low using nut or some equivalent.

    Some people go as far as to say that RAID 5 should never be used.

    You also have very long recovery times when you replace a failed drive (days). Any other failure during this time means total data loss (of course RAID 6 gives you a second redundancy). Weekly Resyncs are very slow too (hours to days), and (unless you constrain your max throughput) will bring your system to its knees.

    zfs does not suffer from these problems, BTW.

    I run software RAID 5 via mdadm and have a UPS. I’ve replaced drives twice with no issues other than a slightly nervous long wait during recovery. I’m too cheap to buy the extra HDD for RAID 6, and may end up regretting it one day.


  • My $0.02c worth - I have run all sorts of servers at home over the years, and one of the main challenges around the hardware is managing heat.

    I’ve used mini-ITX mobos and tiny cases for builds. They look gorgeous, but at some point, when you stick enough drives in there (assuming you can) or make the CPU/GPU busy, you are going to have a heat problem, or a noise problem, or both.

    On my mythtv build I used M-itx and a gorgeous Lian Li small case. It was a beautiful add to my home theatre stack, but in the end I drilled a ton of small holes in the top and added a slow 140mm fan to control the heat without noise.

    The same goes for my file server - it was a slightly larger case with no GPU, but once I added my 6th HDD and had a ton of services running, heat became an issue and I was having to add extra fans, which could only be 80mm so they ran fast and noisy.

    My new build I’m going to go all the way with a Phanteks Enthoo Full Tower and a few 120mm fans. I’ve decided that looks don’t matter

    The other problem for me with these tiny builds is cable management. I’m complete shit at it, and small builds requires some skills. A big case gives you space to spread those cables out.

    Lastly, you can get ATX or EATX mobos with 6, 8 or more SATA connectors - room for growth! And there are very low power options available.

    I’ll soon have the appleTV + TV upstairs, laptop in the office, and the monster server downstairs with cat-6 + Gb fibre throughout.


  • wth@sh.itjust.workstoAntiwork@lemmy.worldPursuing your passion
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    1 year ago

    Some well off people work way more than 40 hours per week to be wealthy. Not all of them are living the dream (so to speak) - they also can be stuck.

    What the super rich people get is time. They have people to take care of all the crap the rest of us deal with - shopping, fixing the car, booking holidays, cooking, cleaning…

    Yeah… I’d rather be wealthy than not.




  • I forgot to mention - spam isn’t too bad with a well trained SpamAssassin.

    Plus you will need to learn your virtualisation tool really well because of all the networking routes required and operating it on the command line. VBoxManage is your friend, but its just not friendly.

    From a security perspective - I did everything in Linux, and only opened the required ports (plus ssh, which I moved to a random high port number). I have auto-update on for security patches, but NOT for regular patches (because Zimbra tends break things, so you need to snapshot first).


  • I’ve been running my own mail server for about 15 years now… Let me offer some insights.

    • Its used by me and the family, so I do have other users who expect things to work.
    • I used commodity hardware, with a Linux host (and guest).
    • the mail server runs in a VM, so it is trivial to: stop, copying the VM to USB, restart.
    • Maintaining uptime isn’t too bad, but when the mail server goes down, you need to get onto it quickly. I’ve had power supplies fail, HDD’s fail, memory fail.
    • If you should happen to be out of town when a failure occurs (I’ve had this twice), then the server stays dead until you are back. That does not make your users happy. If its more than 4 days, then the SMTP standard says email is lost.
    • There have also been a few software issues with Zimbra (my current tool) - the stats daemon filled the disk, the upgrader broke permissions all over the place multiple times. Each of these requires time to investigate, research online etc. Snapshotting is awesome! Right now I have a problem where the VM disk file is growing, but the space used inside the VM is not. I have zero’d out free space and compacted the VM but don’t know why it is happening yet. More research needed.
    • You will learn to hate blocklists. There are many, and there are meta blocklists. You have to watch them because at any time, you will be added and your email will silently get dropped. Sometimes the blocklist trashes whole subnets because of a single actor, sometimes even more, and so you will get included due to other bad actors. Getting off a blocklist is hard… you send emails, you fill in web forms, you look for a contact details, you wait… Then some number of days/weeks later, you are off again.
    • You have to learn DKIM, SPF, DMARK, managing DNS etc.
    • I used to use self-signed certs and live with the warnings. Now I used Lets Encrypt, which is awesome!.
    • You can try to get reverse DNS working, but that’s up to your ISP (who usually don’t care, so good luck). No rDNS can be viewed as bad by email recipients so your spam score starts at >0.
    • If you run it at home, you will be part of a block of IPs that are known to be home users, so your spam score starts at >0.
    • I’m lucky in that I run it on a spare public IP address on my server housed at work. But that will need to change soon.

    I started using native Linux mailboxes, later added roundcube (web UI), investigated Mailinabox, but now use zimbra. That gives me calendar/contact sharing, email/calendar/contacts to iOS devices (which is the main way my family get email), and lots more. Moving data from one to the other took a couple of days of effort. (Yeah… I know its supposed to be trivial, but its not when you include tool research, testing, execution one at a time etc).

    Bottom line - you will learn lots, you will lose many weekends and sometimes a weekday here or there as you try to handle emergencies, it will never be set-and-forget.

    My original rational was learning, privacy and my own domain and nicer looking email addresses than john1234@gmail.com. I’m looking for an online alternative as its time to lighten the load, but I have a lot of services that we use in Zimbra.

    Good luck with it!


  • I gotta take my hat off to the GOP here. While both parties have gerrymandered, the GOP have taken it to the extreme. They will lock in their ruling majority (despite losing at the polls) in every state where they control the Supreme Court and legislature. They will become unassailable in those states.

    They know they have to do this - they are (or will be) in the minority.

    The Supreme Court did the USA a disservice because they could have tempered the worst excesses of the various states. But they have declared themselves hands off - let the states decide.

    Sigh.


  • Its getting there, and there is some entertaining content on here (comments and posts). But I think we are still missing the super high end responses. No matter what the topic, one or two people would jump on and have deep specialised knowledge of the field - be it naming an insect from a blurry image or commenting on a geopolitical situation. I still see lots of posts that generate nothing more than “huh” or “wow” type comments.

    When that starts appearing more broadly, I think the quality here is going to take another leap.