[docs] add some installation instructions

installation.md

@@ -1,4 +1,5 @@
 # Installation
+> Note: in this configuration example the username `dn42` and "default" directories are used, if you want to use other change these in the examples.
 
 ## Server
 
@@ -12,5 +13,67 @@
    3. remove comments in config file
 6. run the server: `python backend/main.py`
 
+to enable automatic start of this service on boot you can use this systemd .service file
+```
+$ cat /lib/systemd/system/dn42-autopeer-web.service
+[Unit]
+Description=dn42 autopeering web frontend
+
+[Service]
+# It should _not_ be run as root
+User=dn42
+Group=dn42
+Type=simple
+Restart=on-failure
+RestartSec=5s
+WorkingDirectory=</path/to/autopeering/>web
+ExecStart=start.sh
+
+[Install]
+WantedBy=multi-user.target
+```
+
 ## Nodes
-#todo
+
+1. clone repository to the node(s) or copy "nodes" directory to the nodes
+2. change directory into `nodes`
+3. create VirtualEnv: run `python3 -m venv venv` then `source venv/bin/activate`
+4. install dependencies: `pip install -r requirement.txt`
+5. create config file: 
+   1. `cp node.config.example.json config.json`
+   2. edit example config to represent your situation
+   3. remove comments in config file
+6. update the templates to represent the settings of the node
+7. setup file permissions for wireguard and bird config files:
+   - bird:
+     - add the dn42 user to the bird group: `usermod -a -G bird dn42`
+     - allow the bird group to edit config files: `chmod ug+rwx /etc/bird/peers/`
+     - allow user+group bird to edit peers configs `chmod ug+rw /etc/bird/peers/ -R`
+     - `chown bird:bird /etc/bird/peers -R`
+   - wireguard:
+     - `chown root:dn42 /etc/wireguard`
+     - `chmod ug+rw /etc/wireguard/*`
+     - `chmod 600 /etc/wireguard/dn42.priv`
+8. allow `dn42` user to start/stop/enable/disable wireguard tunnels:
+   - add the `wg-services.sh` script to `/etc/sudoers` using `visudo` <br> `Cmnd_Alias WG_SERVICES = /path/to/autopeering/nodes/wg-services.sh` <br> `dn42    ALL=(ALL) NOPASSWD:WG_SERVICES`
+9.  run the server: `python backend/main.py`
+
+to enable automatic start of this service on boot you can use this systemd .service file
+```
+$ cat /lib/systemd/system/dn42-autopeer-node.service
+[Unit]
+Description=dn42 autopeering node daemon
+
+[Service]
+# It should _not_ be run as root
+User=dn42
+Group=dn42
+Type=simple
+Restart=on-failure
+RestartSec=5s
+WorkingDirectory=</path/to/autopeering>/nodes
+ExecStart=start.sh
+
+[Install]
+WantedBy=multi-user.target
+```

nodes/start.sh

@@ -0,0 +1,3 @@
+#! /bin/bash
+source venv/bin/activate
+python main.py

nodes/wg-services.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+ACTION=$1
+
+case $ACTION in
+        enable)
+                systemctl enable "wg-quick@dn42_$2";
+                ;;
+
+        disable)
+                systemctl disable "wg-quick@dn42_$2"
+                ;;
+
+        start)
+                systemctl start "wg-quick@dn42_$2"
+                ;;
+
+        stop)
+                systemctl stop "wg-quick@dn42_$2"
+                ;;
+
+        *)
+                echo “User Selected Choice not present”
+                exit 1
+
+esac

web/start.sh

@@ -0,0 +1,3 @@
+#! /bin/bash
+source venv/bin/activate
+python backend/main.py