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submitted 6 days ago by 6R1MR34P3R@lemmy.ml to c/linux@lemmy.ml

Recently in Spain we have suffered a complete power outage, with no electricity for a long time. Some were able to have power on their computers with generators, solar panels, etc. And I know you can have data connectivity with SDR or HAM radio. But my question here is, what are some good self-host/local offline software that we can have and use for when something like this happens. I know kiwix, and some other for manuals. Please feel free to share the ones you know and love, can be for any type of thing as long as it works completely offline, just name it. Of course for GNU/Linux (using Arch myself BTW). Thanks in advance.

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[-] BastingChemina@slrpnk.net 15 points 5 days ago

There is the kiwix hotspot.

A WiFi hotspot that gives you access to the entire Wikipedia, medical information, homesteading books ...

[-] tasankovasara@sopuli.xyz 19 points 6 days ago

I have my homeserver rsync three Arch mirrors and three Arch ARM mirrors in rotation on three days every week. Thus I have full local repos for these. All my machines are configured to use this local repo. The reason I do this is precisely to be prepared for the inevitable 'Internet is broken' scenario.

[-] TCB13@lemmy.world 14 points 6 days ago* (last edited 6 days ago)

Yeah, some people don't like to run with full repo mirrors but keep updated copies of the Debian ISO that can be mounted as repositories at any point:

It's essentially the same, but in another format.

[-] MNByChoice@midwest.social 3 points 6 days ago* (last edited 6 days ago)

One can also use a cache to hold deb and rpm files requested by the machines. (Works great when running hundreds of systems.)

I like "apt-cacher-ng". It will do deb and rpm. https://wiki.debian.org/AptCacherNg

https://www.unix-ag.uni-kl.de/~bloch/acng/

Edit: better link

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[-] tasankovasara@sopuli.xyz 9 points 6 days ago

Since this has seen some interest – here's how much disk space this opulence costs: Arch x86 repository is 113 Gb and Arch ARM is 123 Gb :)

[-] Grunt4019@lemm.ee 3 points 5 days ago

That’s actually much smaller than I expected.

[-] 6R1MR34P3R@lemmy.ml 4 points 6 days ago

good one thanks, will RTFM for this

[-] phantomwise@lemmy.ml 2 points 5 days ago

total respect

[-] limelight79@lemm.ee 15 points 6 days ago

There's a whole community for self hosting software.

!selfhost@lemmy.ml

Hopefully I did that right...

[-] 6R1MR34P3R@lemmy.ml 6 points 6 days ago

thanks, will crosspost there. I didn't saw that one

[-] cerement@slrpnk.net 4 points 5 days ago
[-] Zenlix@lemm.ee 12 points 6 days ago

Downloading all of wikipedia for one language is abiut 90GB. Inhave it on a spare drive in case of an outage. That way if I need to research something I can still do.

[-] 6R1MR34P3R@lemmy.ml 7 points 6 days ago

Doesn't Kiwix already do this? Or is there any advantage in doing it myself?

[-] sneezycat@sopuli.xyz 4 points 6 days ago

I guess the advantage would be to have a more updated copy, because the ones on kiwix are one year old.

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[-] a14o@feddit.org 10 points 6 days ago

You can put together a media server and build a catalogue so you can watch movies and series offline. Maybe not a huge priority in that situation but definitely nice to have.

Jellyfin is a good option for streaming from a media server to other devices. The *arr suite is an option for building the catalogue.

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[-] iii@mander.xyz 8 points 6 days ago
[-] tasankovasara@sopuli.xyz 9 points 6 days ago

Also Reticulum Network Stack! Much more ambitious than Meshtastic.

[-] 6R1MR34P3R@lemmy.ml 4 points 6 days ago

doesn't this one needs a specific set of hardware? is it affordable here in Europe? thanks for sharing, I have heard of this for a long time but didn't get onto it, might look now that this happened

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[-] cerement@slrpnk.net 4 points 5 days ago

an extreme option could be something like the Varvara / Uxn virtual machine by the Hundred Rabbits collective (created after having to deal with Adobe updates and Xcode updates over a barely functioning cell connection) – emulators are available for all sorts of hardware

blog: Weathering Software Winter | youtube: Weathering Software Winter

[-] adry@piefed.social 5 points 6 days ago

Spain? check guifi.net ;)

People had LAN Partys playing video games "offline" in the 90s... Setting up a network is easy, the difficulty comes from scaling up to many nodes, and spreading through the geography (e.g. if you were to use antennas for WLAN, they would need a mostly unobstructed vision) which in urban areas gets tricky.

But those "topology" issues can be flattened, e.g. you can always have a raspberry pi (or any device) acting as server in the corner of a neighborhood. A virtual bulletin board, emails, etc. all could be self-hosted locally there and then people could go grab a coffee and consume the local news just like in the middle ages, but with a screen, digital assets and some healthy amount of trolling :P

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[-] a14o@feddit.org 5 points 6 days ago

Navigation on Android: Osmand lets you download and cache OSM data so you can use it offline. Cache is unlimited if you download Osmand via F-Droid.

[-] qjkxbmwvz@startrek.website 4 points 6 days ago* (last edited 5 days ago)

You mentioned ham radio


definitely fun! It's a process to get into it though, as you need to study/pass an exam, and then you need a radio. Radios range from cheap ($25 or so) in the VHF/UHF ("walkie talkie"-style) to more expensive for an HF rig ($1000 range for 100W HF). If you want to get into low power ("QRP") it can be much cheaper. You also need a fair amount of space for a good antenna setup...

There are tons of different communication modes, some without a computer and, like you mentioned, some that use computers. wsjtx and fldigi are popular programs.

Good luck!

[-] 6R1MR34P3R@lemmy.ml 2 points 6 days ago

thanks, really appreciate all the recommendations here :) i got myself an RTL-SDR because a friend told me about them (didn't arrived yet) definitely gonna check on all that you talk about too

[-] cerement@slrpnk.net 2 points 5 days ago

(there’s also an older, but still working, protocol called packet radio – does require a bit more technical expertise though)

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[-] beeng@discuss.tchncs.de 4 points 6 days ago

https://freifunk.net/

An independent mesh network in Germany.

[-] 6R1MR34P3R@lemmy.ml 2 points 6 days ago

does it work in Spain though?

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[-] pierre_delecto@hexbear.net 3 points 5 days ago

I haven't heard of kiwix before, that's pretty neat

[-] CypherColt@sh.itjust.works 2 points 5 days ago

One I'm using a lot is a self hosted password manager. Vaultwarden specifically. Useful for more than just passwords of course, can take secure notes as well. I keep it locked to my local network only, and need to VPN in to my home network when I'm out to access it.

[-] techsnob@sh.itjust.works 4 points 6 days ago
  • Audiobookshelf: Audiobooks
  • Navidrome: Music
  • Jellyfin: Movies, videos, audio and books
  • Radicale: calendar, contacts and tasks
  • Nextcloud: all files and more
  • HomeAssistant: for managing the solar panels, battery and other iot
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[-] utopiah@lemmy.ml 2 points 5 days ago* (last edited 5 days ago)

So... I've done that May 2023 for a holiday trip.

I left with my RPi4 and few gadgets but no Internet.

There I built https://git.benetou.fr/utopiah/offline-octopus/ and my main take away is

  • you can build what is missing

and more importantly the meta take away is

  • you need to iterate preparations

because just like first aid you need to be actually ready when needed and knowledge change over time. You need to actually try though, test your setup and yourself genuinely otherwise it is intellectual masturbation.

Have fun!

[-] daniskarma@lemmy.dbzer0.com 2 points 5 days ago

You can download a collection of thousands (maybe a million I don't even know) of books in Spanish in epub format, from the "secret library". It's like a 100Gb torrent, but way worth it.

Ebooks tens to have long lasting battery. I spent a few hours reading on monday.

Just now I'm on my phone, but if you are interested let me know and I'll try to find the link and will mp it to you if you want.

And just now I've been thinking that epubs being so small size maybe there's a way to transmit them over this radio mesh networks on demand, like some sort of radio library. I've have to look into that. Maybe they are too big for that as radio bandwidth for data transfer tends to be incredibly small.

[-] 6R1MR34P3R@lemmy.ml 2 points 5 days ago

i'd love to have those if you don't mind, is it ok for you to send over here? otherwise you have my contact info on my profile. Thanks for the info and is a very good idea indeed

[-] signofzeta@lemmygrad.ml 1 points 5 days ago

Could you send ePub files over ham radio? Let’s forget about TCP-IP mesh networking like AREDN for now. That’s too easy. Let’s look at radio protocols. D-Star can run at 128 Kbps on the 23 cm band. That’s not too common. Drop down to HF and you’re looking at 9 Kbps via PACTOR-IV.

In comparison, landline dial-up modems topped out at around 56 Kbps.

Now, I’ve seen ePub files around 1-2 MB, but that’s with cover art, images, embedded fonts, and all that fun stuff. With enough patience, that can work. But, strip out all that, leaving behind plain text and XML, and you’ve got something much more manageable that can be sent relatively quickly.

I can’t speak for Spain, but in the U.S., the FCC recently removed most symbol rate restrictions, so we might be able to squeeze out a little more speed.

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this post was submitted on 30 Apr 2025
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