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Cake day: June 28th, 2023

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  • the idea is that: all your applications work under the same user. or at least under the same group. because this is exactly how the differentiation of rights is applied.

    A good plan is to create some kind of user in all three containers and run qbittorrent, samba and the third application under it.

    A bad plan is to run everything under a random user with 777 rights, but this is a really bad plan.

    Create a user in all three containers and work under it. That is not hard. Run qbittorent with that user. Config will be there: /home/user/.config . Then set that user for samba. I don’t know third app , but I think you can find how change user in manual.







  • 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


  • 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.



  • 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.