Changing RaspPi hostname caused flows to disappear

[Jon Murphy]

Tonight I changed the hostname of a RaspPi 2B (running Jessie) from the default "raspberrypi" to "RaspPi2B".  I used the command `sudo hostnamectl set-hostname RaspPi2B`.  After a `sudo reboot` all of my created flows were gone.  Nothing but one blank tab.  

I did a `sudo hostnamectl set-hostname raspberrypi`  and all of my flows came back.  How do I change the hostname?

[Colin Law]

Use raspi-config

Colin

On 20 Dec 2016 6:57 a.m., "Jon Murphy" <jcmur...@gmail.com> wrote:

Tonight I changed the hostname of a RaspPi 2B (running Jessie) from the default "raspberrypi" to "RaspPi2B".  I used the command `sudo hostnamectl set-hostname RaspPi2B`.  After a `sudo reboot` all of my created flows were gone.  Nothing but one blank tab.  

I did a `sudo hostnamectl set-hostname raspberrypi`  and all of my flows came back.  How do I change the hostname?

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[Julian Knight]

You need to go to your .node-red config folder and find the flow file. Then rename it, the format will be obvious when you look at it as it has the hostname in it.

Alternatively, you can keep the same flow file name but then you need to start Node-RED with a parameter that tells it which file to use.

[Dave C-J]

or you can edit the settings.js file and fix it permanently in there.

[Jon Murphy]

Got it!  Thank you everyone!

FYI - the hostnamectl command does not update the /etc/hosts file.  You may want to follow these steps:

cat /etc/hostname ## review current hostname info

cat /etc/hosts ## review current hosts info

sudo hostnamectl set-hostname <new_machine_name> ## set new hostname

sudo nano /etc/hosts ## edit hosts file

## look for line 127.0.1.1 raspberrypi

## then change raspberrypi to <new_machine_name>

127.0.1.1 <new_machine_name> 

## exit and save

sudo reboot

sudo nano ~/.node-red/settings.js

## look for //flowFile: ‘flows.json’

## then change to 

flowFile: 'flows_raspberrypi.json'

## exit and save

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From: Dave C-J
Sent: December 20, 2016 at 2:58:20 AM CST
To: node...@googlegroups.com
Subject: Re: [node-red] Re: Changing RaspPi hostname caused flows to disappear