XPUB HUB New Nodes

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Adding a node to the XPUB HUB

New nodes (machines) can be edited to the HUB Tinc network.

To add a node to the HUB, you will need to:

  • 0. Determine IP address of a new thing (see below)
  • 1. Add a new thing (see below)
  • 2. Ask user to give you a preferred username & a new ssh public key (see below)
  • 3. Add a new jump user on the XVM (see below)
  • 3. Jump user connects to his machine (see below)
Note: we will only add things that can only be ssh'ed via keys, no passwd logins plz.

Install Tinc

See instructions at Tinc page.

Add new tinc Node to HUB network

User & SSH key

In your Pi: create a user with the same username as in the sandbox. Keeping it the same as in the sandbox will make things easier for us and gnd.

Add your public ssh key (from your own computer) to your account the Pi (same as mentioned) to ~/.ssh/authorized_keys. On some systems, there is a script (already installed) to do this, called ssh-copy-id:

ssh-copy-id username@local.pi.IP.addr

Otherwise, the following attempts to do the same (basically you are just adding the contents of your public key as a new line to the file authorized_keys on the pi:

cat ~/.ssh/id_rsa.pub | ssh local.pi.IP.addr "cat >> ~/.ssh/authorized_keys"

Disable SSH to your pi with password (allow ssh key only), by:

  • ensuring you laptops ssh public key is in your pi ~/.ssh/authorized_keys:
cat  ~/.ssh/authorized_keys
  • ensuring you can login to the Pi with ssh key:
ssh username@pi.ip.add -i ~/.ssh/id_rsa
  • edit /etc/ssh/sshd_config:
sudo nano /etc/ssh/sshd_config
  • and uncomment the line:
#PasswordAuthentication no


PasswordAuthentication no
  • reload ssh:
sudo systemctl reload ssh

You end up with the following info:

username: nameoftheuser
Node IP: 10.0.0.???
Node name: nameofnode 
ssh public key:
ssh-ed25519 ... ... nameoftheuser@laptop

Add yourself to the HUB list

Add your chosen Node name and IP to HUB#IP_allocation.

Student project IPs last number should have 3 digits, last one is Tisa's, so you can start from there.

Invite the new node to the HUB network (staff)

In the XVM (xpub server)

As root:

create an invitation node the node as described in HUB#Adding_a_new_thing

tinc -n hub invite $NAMEOFNODE

Which will generate an invitation address

Accept Tinc invitiation link

Back In the Pi

User invitation to join the network ($INVITE_ADDRES)

sudo tinc join $INVITE_ADDRES

Add the pi to the hub network under the chosen Node IP ($NODE.IP.ADDRS):

sudo tinc -n hub add subnet $NODE.IP.ADDRS

edit the tinc-up file in /usr/local/etc/tinc/hub/tinc-up

  • comment out the echo line
  • add the line ifconfig $INTERFACE $NODE.IP.ADDRS netmask
Note: $INTERFACE should remain as is; $NODE.IP.ADDRS should be replace with the Node IP 
  • Example tinc-up file:
# echo 'Unconfigured tinc-up script, please edit '$0'!'
ifconfig $INTERFACE netmask


FOR DEBIAN You may need to install ifconfig

   apt install net-tools

Test if Tinc works

Start th tincd daemon

sudo tincd -n hub -D -d3

In a new terminal window, ssh again to the pi and see if you can ping other tinc nodes:


If so Tinc is running :) yahh

Run Tinc as a service

To do this, we will make a tincd service file.

According to tinc documentation...

Tinc ships with systemd service files that allow you to start and stop tinc using systemd. There are two service files:

  • tinc.service is used to globally enable or disable all tinc daemons managed by systemd
  • tinc@netname.service is used to enable or disable specific tinc daemons.

These are located in the source directory, in the sub-directory systemd/

However this files, seem to give some issues, as metioned in the tinc github: issue 133, issue 168

Hence we'll us the ones bellow that so far have worked fine.


# This is a mostly empty service, but allows commands like stop, start, reload
# to propagate to all tinc@ service instances.

Description=Tinc VPN
Documentation=man:tinc(8) man:tinc.conf(5)

ExecReload= /usr/local/sbin/true



Description=Tinc net %i
Documentation=man:tinc(8) man:tinc.conf(5)

ExecStart=/usr/local/sbin/tincd -n %i -D
ExecReload=/usr/local/sbin/tincd -n %i -kHUP


Note: in my system tinc was installed inside /usr/local/bin/tinc, /usr/local/bin/tincd and its configuration is in /usr/local/etc/tinc. But this is system specific. Ensure you know where these directories are in your system.

  • Enable
    • sudo systemctl enable tinc
    • sudo systemctl enable tinc@hub
  • Start sudo systemctl start tinc@hub
  • Check status sudo systemctl status tinc@hub

Note that because tinc@testvpn.service requests tinc.service we don’t need to start that one, as it is started by tinc@testvpn.service

If all is good. We can test by rebooting the system and seeing that if after a while tinc@testvpn is up. You can check that by keeping starting a by pinging the ping and checking the status of tinc@hubsudo systemctl status tinc@hub.

SSH to your node

Add a new entry to your laptop ~/.ssh/config by following this template

Host hub.PI_NAME 
User yourname
ProxyJump yourname@xpub.nl:2501
Identityfile ~/.ssh/id_rsa
Serveraliveinterval 30

Note: ls ~/.ssh to know what is filename for the Identityfile (private ssh key)

Enable to ssh jump to RPI on XVM (staff)

XPUB Staff on XVM: use jumpuser script to enable to ssh jump to RPI.

If user's username and its ssh publickey is XVM's /home/

jumpuser add_ip username 10.0.0.XYZ 

If not, also add the user with


log you changes with:


Enable HTTP to tinc node (staff)

To make the https://hub.xpub.nl/NEWNODE url work.

Note: The pi needs to run a webserver, otherwise there is nothing to see :).

XPUB Staff on XVM will need to as root:

  • edit /etc/nginx/sites-available/hub.xpub.nl
  • adding to it a new location to the hub.xpub.nl server block
        location /nodename {
                proxy_pass http://tinc.node.ip.addr/;
                client_max_body_size 200M;
  • test the configuration
nginx -t
  • if all good restart nginx
systemctl restart nginx