- 1 Related pages
- 2 HUB nodes
- 3 Snippets of installation HOW TO's
- XPUB HUB: Add a new node
- XPUB other HUB nodes (duplicate of XPUB HUB: Add a new node?)
- XPUB HUB Node: Sandbox
If you still need to install Tinc follow the instructions in the page Tinc
About the HUB
HUB or https://hub.xpub.nl is a VPN wonder to gazillions XPUB things.
- 1-9: XPUB main servers
- 10-99: shared machines used by the whole course (for admin or lessons or multi-user projects/libraries/etc)
- 100-254: personal and/or grad projects machines
Subnet Node ??? ------ ---- --- 10.0.0.1 xvm XPUB server, tincd overlord, destroyer of pads 10.0.0.10 skattkista Borg Central 10.0.0.11 sandbox xpub3 sandbox (2019-2021) 10.0.0.12 sandbot xpub2 sandbox (2020-2022) 10.0.0.13 soupboat xpub1 sandbox (2021-2023) 10.0.0.14 etheraxis xpub2 (2021) 10.0.0.100 wizardcity Aymeric 10.0.0.101 screaming Angeliki (student 2017-2019) 10.0.0.102 warnet Tash (student 2017-2019) - offline 10.0.0.??? food Alice -- misconfigured, lost in ether 10.0.0.103 bootleglib Simon (student 2018-2020) 10.0.0.104 systers Artemis (student 2018-2020) 10.0.0.105 watermark Pedro (student 2018-2020) 10.0.0.106 ilinx Tancredi (student 2018-2020) 10.0.0.107 repeater Biyi (student 2018-2020) 10.0.0.108 netcare Rita (student 2018-2020) 10.0.0.109 cartographies Paloma (student 2018-2020) 10.0.0.110 fabulousloopdeloop Steve (xpub staff) 10.0.0.111 functionalobject Sandra (student 2019-2021) 10.0.0.112 tnh Tisa (student 2019-2021)
Can I point two domains to my node?
http://blabla.net/wiki/ <----- my own domain https://hub.xpub.nl/blabla/wiki/ <----- the XPUB domain + the HUB's subdomain
It depends where the RPi is located:
- Home: both
- XPUB studios: hub only
The reason why is not super obvious to guess if you're discovering the joys of public/private IPs. It's because of being (able or not) to reach the RPi from the outside. At home you have most likely control over the firewall in your modem/router/switch, so you can have the http port of the RPi reachable from the outside if you open a port on your modem/router/switch and have it redirected to the port on your RPi (that's what NAT does). So you can use that to point your own domain to your home IP and that's it. On top of that you have tinc that does all the magic to be reachable regardless of your network situation via http traffic tunnelling via the VPN. In the studio, you're at WdKA, you are behind the HR firewall. You cannot open ports, you can't be reached from the outside, the only option is tunneling. The only option to also have your own domain reaching the RPi in the studio would be to have the domain handled by xvm, so that when blabla.net is hit, xvm (nginx really) can be configured to proxy to the VPN.
What is the advantage from using the HUB -vs- opening ports in my home router?
The HUB enables you to be super nomad, you can put the RPi anywhere, as long as it's plugged on a network that gives an IP to the RPi, and it has internet access (like your laptop or phone would), then it will immediately be avail on the HUB
Network speed: we're on uni network, it's faaaaast, you're most likely going to be limited by the RPi shitty sd card speed
Security? Hmmm... yes/no... more privacy, you don't divulge your home IP if you go through the HUB (even if the RPi is located at home)
Being part of platinum tier XPUB club :----). See https://hub.xpub.nl.
BONUS: Self-hosting is not trivial, sure you can follow the HOWTO, but it will only get you so far. So as a result, it really forces to understand basics of TCP/IP networking and HTTP traffic.
How is the list on https://hub.xpub.nl being created?
To be visible in the list, you need to add the link to the html page, it's a manual edit on the XVM.
Snippets of installation HOW TO's
(These snippets below might be moved to the other pages soon.)
Generating a ssh pubkey for the jump user
This should be done by the users themselves. This only applies to linux-like OS's. Users should be made aware what ssh keys are.
This generates a new key with a default name, so if the user already has an existing key, they should name it differently, so the existing one is not overwritten. The key should be protected by a passphrase.
ssh-keygen -t ed25519 -b 320
Once the key is generated, we will need the public key (pubkey). Usually it would be a file called id_ed25519.pub located in ~/.ssh. Just cat the file and send us the contents.
♥♥♥ Please be aware there is also a file called id_ed25519. This is the private key. Dont ever send or disclose the private key ! ♥♥♥
You can also send id_ed25519.pub as an attachment. If you named your key differently, it will be a file called $NAME.pub
Adding a jump user on XVM
There is a script called add_jumpuser. It adds a new user on XVM, that is only allowed to ssh into the remote machine. You will need:
- Username for the user
- IP of the machine (see below for allocation)
- ED25519 pubkey from the user
Once you have all of this, just run on XVM (note the single quotes around the ssh pubkey):
/root/scripts/add_jumpuser.sh USERNAME IP 'PUBKEY' eg.: /root/scripts/add_jumpuser.sh lol 10.0.0.666 'ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAIE29EOVCl0/WjknAoEEEZSPUyCWQKNoXX2HCC123456 some1@host'
When removing the user on XVM:
- userdel -r USERNAME
- remove USERNAME from AllowUsers in sshd_config
- restart sshd
How to SSH to HUB nodes
On the user's personal machine (where the public key was generated) just:
ssh -J xpub.nl:2501 $IP
If for any reason it doesnt work, please send us the output of:
ssh -J xpub.nl:2501 $IP -vvv
Here is a ssh configuration which should allow you to ssh easily from your local machine to one of the Hub nodes
By adding to ~/.ssh/config the following configuration, and changing with the correct details:
Host hub.nodename User username Hostname 10.0.0.XXX ProxyJump email@example.com:2501 Identityfile ~/.ssh/id_rsa Serveraliveinterval 30
- nodename: is the name you would like to give this node of hub.
- XXX: termination if node's IP
- username: your username in the Pi and Xpub server (should be the same)
- ~/.ssh/id_rsa location of the private keys