Raspberry PI eth0 static IP network configuration via Dashboard

README.md

This flows allows users to manually change and enable the static IP configuration of the Raspberry PI.

This flow reads configuration in /etc/dhcpcd.conf file and uses sed commands to enable static ip on eth0 interface end manually set the new static ip parameters.

If you have never edited the /etc/dhcpcd.conf file this flow will work without any problem, it expect to find something like this

#interface eth0
#static ip_address=192.168.1.xx/24
#static routers=192.168.1.xx
#static domain_name_servers=192.168.1.xx

or this

interface eth0
static ip_address=192.168.1.xx/24
static routers=192.168.1.xx
static domain_name_servers=192.168.1.xx

This flow reads the entire content of the /etc/dhcpcd.conf file and starts reading line by line. Once he find the line interface eth0 or #interface eth0 it starts to store actual configuration values until he finds a line that doesn't contain static. For this reason DON'T ADD BLANK LINES OR COMMENTS to the configuration file or this flow will not work as expected

The flow will edit this file using sed so be careful and make sure you set a valid configuration before reboot your Raspberry.

Enjoy

flow.json

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If settings are wrong this may cause the device to be unreachable","payloadType":"str","topic":"","x":170,"y":480,"wires":[["846fb983.93f448"]]},{"id":"6da389d0.e8d598","type":"exec","z":"2d2bd18e.3e4abe","command":"sudo reboot","addpay":false,"append":"","useSpawn":"","timer":"","name":"","x":650,"y":480,"wires":[[],[],[]]},{"id":"d0341b01.217ee8","type":"ui_button","z":"2d2bd18e.3e4abe","name":"refresh","group":"1cf52e38.3cfee2","order":6,"width":"3","height":"1","passthru":false,"label":"Update","color":"","bgcolor":"","icon":"","payload":"true","payloadType":"bool","topic":"","x":111.44442749023438,"y":247.33291149139404,"wires":[["fb34e190.3926a","c2728ad2.71ac48"]]},{"id":"fb34e190.3926a","type":"delay","z":"2d2bd18e.3e4abe","name":"","pauseType":"delay","timeout":"300","timeoutUnits":"milliseconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":278.8888740539551,"y":247.44451141357422,"wires":[["6a63b433.e2a73c"]]},{"id":"c2728ad2.71ac48","type":"function","z":"2d2bd18e.3e4abe","name":"send commands","func":"var properties = flow.get(\"properties\");\n\nvar disabled = flow.get(\"disabled\") ? '#' : '';\n\nif(disabled == '#'){\n    //enable interface (replace only first occurance)\n    var command = `'0,/#interface eth0/s//interface eth0/g;' /etc/dhcpcd.conf`;\n    node.send({payload: command})\n}\n\nfor(var i=0;i<properties.length;i++){\n    var p = properties[i];\n    \n    var old_value = flow.get(p);\n    var new_value = flow.get(p+\"_new\") || old_value;\n    \n    if(old_value && ((old_value != new_value) || disabled == '#'))\n    {\n        //enable interface (replace only first occurance)\n        var command = `'0,\\\\?${disabled}static ${p}=${old_value}?s??static ${p}=${new_value}?g;' /etc/dhcpcd.conf`;\n        node.send({payload: command})\n    }\n}\n\n","outputs":1,"noerr":0,"x":300,"y":320,"wires":[["8d2915b0.eb5188","9ae462fb.d924d"]]},{"id":"846fb983.93f448","type":"ui_toast","z":"2d2bd18e.3e4abe","position":"dialog","displayTime":"3","highlight":"","outputs":1,"ok":"OK","cancel":"Cancel","topic":"ATTENTION","name":"","x":330,"y":480,"wires":[["9f141047.ed494"]]},{"id":"9f141047.ed494","type":"switch","z":"2d2bd18e.3e4abe","name":"OK ?","property":"payload","propertyType":"msg","rules":[{"t":"eq","v":"OK","vt":"str"}],"checkall":"true","repair":false,"outputs":1,"x":490,"y":480,"wires":[["6da389d0.e8d598"]]},{"id":"a825b0e4.2a051","type":"function","z":"2d2bd18e.3e4abe","name":"store new","func":"flow.set(msg.topic+\"_new\", msg.payload);\nreturn msg;","outputs":1,"noerr":0,"x":1419,"y":161,"wires":[["aef2e472.475238"]]},{"id":"b585fb60.e936a8","type":"inject","z":"2d2bd18e.3e4abe","name":"init","topic":"","payload":"","payloadType":"date","repeat":"","crontab":"","once":true,"onceDelay":0.1,"x":122,"y":91,"wires":[["a6810bb0.a3e788"]]},{"id":"a6810bb0.a3e788","type":"function","z":"2d2bd18e.3e4abe","name":"set properties","func":"var properties = ['routers', 'ip_address', 'domain_name_servers'];\n\nflow.set(\"properties\", properties);\n\n//init properties\nfor(var i=0;i<properties.length;i++){\n    var p = properties[i];\n    flow.set(p, null);\n    flow.set(p+\"_new\", null);\n}\n\nnode.send({payload: true});\n","outputs":1,"noerr":0,"x":326,"y":91,"wires":[["6a63b433.e2a73c"]]},{"id":"8d2915b0.eb5188","type":"debug","z":"2d2bd18e.3e4abe","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","x":514,"y":385,"wires":[]},{"id":"fd5e6a37.bc5d38","type":"ui_toast","z":"2d2bd18e.3e4abe","position":"top right","displayTime":"3","highlight":"","outputs":0,"ok":"OK","cancel":"","topic":"","name":"","x":1310,"y":340,"wires":[]},{"id":"140df8ca.dea297","type":"change","z":"2d2bd18e.3e4abe","name":"set","rules":[{"t":"set","p":"payload","pt":"msg","to":"Settings updated. 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Hello,
I trying to use your flow but I dont´t know why dont´t work, the UI show the IP, the button restart work fine, but if I change and restart for an new IP nothing happen, the IP don´t change, some ideia what is wrong? Thank you!

@ckwiek Updated

It would be nice to have a function that sets it back to DHCP.

The 'Update' doesn't work; the Node-RED console shows the following:

pam_unix(sudo:auth): conversation failed
pam_unix(sudo:auth): auth could not identify password for [pi]

Similarly for the 'Reboot'.

What to do?

EDIT

The Flow seems to rely on issuing 'sudo' commands - which is not allowed: https://discourse.nodered.org/t/sudo-in-exec-node/4762

The Flow seems to rely on issuing 'sudo' commands - which is not allowed

Adding a Debug node to the stderr out of the "sudo sed -i" Exec node:

Gives:

ie,

sudo: no tty present and no askpass program specified

When the user makes an edit in the form, this causes the notification, "New setting stored" to be given.

This is misleading, as the dhcpcd.conf file has not been updated at this point!

@awneil I know that, could be easily fixed, this is just a starting point :)