• 0 Posts
  • 32 Comments
Joined 1 year ago
Cake day: June 28th, 2023
  • nitrolife@rekabu.rutoLinux@lemmy.ml•I need some help with linux energy management and hibernation
    17·
    11 months ago

    In first you need understand what type of suspend you use:

    Suspend to RAM (aka suspend, aka sleep) The S3 sleeping state as defined by ACPI. Works by cutting off power to most parts of the machine aside from the RAM, which is required to restore the machine’s state. Because of the large power savings, it is advisable for laptops to automatically enter this mode when the computer is running on batteries and the lid is closed (or the user is inactive for some time). Suspend to disk (aka hibernate) The S4 sleeping state as defined by ACPI. Saves the machine’s state into swap space and completely powers off the machine. When the machine is powered on, the state is restored. Until then, there is zero power consumption. Hybrid suspend (aka hybrid sleep) A hybrid of suspending and hibernating, sometimes called suspend to both. Saves the machine’s state into swap space, but does not power off the machine. Instead, it invokes the default suspend. Therefore, if the battery is not depleted, the system can resume instantly. If the battery is depleted, the system can be resumed from disk, which is much slower than resuming from RAM, but the machine’s state has not been lost.

    I think you use Hybrid suspend. Hybrid suspend store memory to disk (20 seconds lag) and then lost battery for memory renew. Need you Suspend to RAM maybe? 20 Seconds lag will fixed with that.

    Then check

    cat /sys/power/mem_sleep

    If you see

    [s2idle] shallow deep

    check first if your UEFI advertises some settings for it, generally under Power or Sleep state or similar wording, with options named Windows 10, Windows and Linux or S3/Modern standby support for S0ix, and Legacy, Linux, Linux S3 or S3 enabled for S3 sleep.

    If you don’t see anything you can swap sleep mode to Suspend to disk. That slow but don’t use any power. Or try fix sleep status.

    More information you can find here: https://wiki.archlinux.org/title/Power_management/Suspend_and_hibernate

  • nitrolife@rekabu.rutoSelfhosted@lemmy.world•Can i use mailcow on a dynamic IP with DDNS-updater for my usecase?English
    1·
    11 months ago

    You need to create an MX record in the DNS zone of your domain. Something like:

    @ IN MX 10 my.zome.
@ IN MX 20 server1.my.zome.

    You can create 1 MX record or more. 10 and 20 server priority for input mails.

    Then you need to create an spf record. There are several options here. For example

    @ IN TXT "v=spf1 +a +mx -all"

    allows you to send emails from A domain records, then from MX domain records and prohibits from all other hosts.

    Theoretically, you can only create an SPF record with A but without MX and dont create MX DNS records. Although I have not tried this configuration.

    This is the minimum set after which you will get into spam, but at least the letters will reach.

    You also need to make a PTR record to avoid spam folder, but this is not possible on a dynamic IP.

  • nitrolife@rekabu.rutoSelfhosted@lemmy.world•Why and when should I use LVM?English
    21·
    11 months ago

    interesting facts about LVM:

    1. You can make a volume snapshot of the system before a major change (for example, an update).

    2. You can enable caching and use HDD together with SSD cache

    3. You can build raid 0,1,5 directly on LVM (you still need modules from mdraid)

    4. Even without a raid, you can expand the partition beyond one disk to another or migrate the partition from disk to disk (without even disabling it)

    However, all this is done from the console and I do not know if there is a GUI.

  • nitrolife@rekabu.rutoFediverse@lemmy.world•Trustable distributed voting in the FediverseEnglish
    21·
    1 year ago

    I think that in order to solve such a question, we first need to consider something else. Why, if votes are so important to you, can’t you just create a bunch of accounts and vote honestly on any server?

    As soon as we are really sure that 1 person is 1 vote, and not 10, 100, 10000 or any other number, then it is already possible to build trust checks between servers. Although it seems that this has not been solved even by large social networks.

    The answer to your question in general is this: store the votes by servers and then double-check the result randomly.

    S returns: 50 votes for a post from server A, 30 for a post from server B, 10 for a post from server C, etc. Then you can randomly check on these servers whether the amount is correct. However, there is no way to check the voices of server S, so they either have to be thrown out or still trust the server at its word. It is possible to fully verify server S only if registration on all servers goes through a trusted intermediary.

  • nitrolife@rekabu.rutoNo Stupid Questions@lemmy.world•Is there a A/MX records tutorial?
    41·
    1 year ago

    On DNS you need A record if you have ipv4 only or A and AAAA records if you have ipv4 and ipv6.

    You DNS outside you home servers? If you have dynamic IP at home you can’t host DNS on home server.

    You have only 1 IP? You need port forwarding on you home gateway to home servers if you use somerhing like SSH. If you want access to something web based you need proxy. NGINX for example.

    How it exactly work:

    • Somewhere someone write youdomain.com in browser.
    • Browser ask local dns: who is youdomain.com
    • local dns ask another dns, and another and in one iteration request go to you dns. Or maybe some of dns have cached answer. But imagine that not.
    • You dns send answer youdomain.com is 111.222.333.444 for example. That is A record.
    • DNS work stop on that.
    • Browser send request to 111.222.333.444 with HTTP header “Host: youdomain.com” and some path. / or /something maybe.
    • Some balancer should get request and send in to right server in you home network.

    UPD: don’t show to internet something risky interfaces. Proxmox web panel or something like that. This is a real bad idea. For that type of services VPN extremely greatest. Send you DNS to public without protection not a great idea too. Including pihole. I think you will get into some botnet already on the 3rd day of work.