Re: [yocto] (Go) Library for configuring Yocto based boxes?

["Nicolas Jeker" <n.jeker@delisys.ch>]

On Mon, 2021-08-02 at 09:35 +0000, Christofer Dutz wrote:
> Hi all,
> 
> so I invested quite some time to using the NetworkManager to configure
> the network settings.
> I’m using a go library: github.com/Wifx/gonetworkmanager for this.
> My network configurations now end up in a directory
> /etc/NetworkManager/system-connections (I can see files with the name
> "{connection-id}.nmconnection"
> However the changes aren't applied. If I run:
> 
>      systemctl restart systemd-networkd
> 

systemd-networkd and NetworkManager are two different things. Make sure
that you only have one of them running at the same time.

A quick solution is to use systemd to disable the systemd-networkd
service (if that's not already the case). What I did as a more long-
term solution is removing systemd-networkd in my distro.conf (works in
local.conf, too):

PACKAGECONFIG_remove_pn-systemd = "networkd"

> The network settings don't change (Both network devices were set to
> DHCP). (By the way … where can I see the default configuration?)
> 

I'm currently using nmcli to set my configuration and apply it with:

nmcli con up {connection-id}

This works for me even if the connection status is already "up". Not
sure if it works when you replace the configuration file, but you might
give it a try. Otherwise restarting NetworkManager should work:

systemctl restart NetworkManager

> However if I reboot the box, I can see my changes applied ... until I
> run the "systemctl restart systemd-networkd" again, because then it
> switches back to the dhcp settings.

I suspect this happens because systemd-networkd "overrides" the
interface configuration that was set by NetworkManager.

> Any tips on how I can apply my changes without rebooting?
>  
> Chris
> 
> 
> -----Ursprüngliche Nachricht-----
> Von: Nicolas Jeker <n.jeker@delisys.ch> 
> Gesendet: Freitag, 30. Juli 2021 10:06
> An: Christofer Dutz <christofer.dutz@c-ware.de>;
> yocto@lists.yoctoproject.org
> Betreff: Re: [yocto] (Go) Library for configuring Yocto based boxes?
> 
> On Fri, 2021-07-30 at 07:43 +0000, Christofer Dutz wrote:
> > Hi all,
> >  
> > I’m very new to the Yocto world.
> >  
> > We are currently working on migrating away from OpenWRT based edge 
> > devices towards ones that we now have Yocto builds for.
> >  
> > All seems to be working nicely on the yocto side.
> >  
> > Our application uses a baseline configuration in order to connect
> > to 
> > our cloud service and there it fetches it’s configuration (We’ve
> > got a 
> > cellular fallback if connectivity doesn’t work at all).
> >  
> > With OpenWRT there was a tool called UCI which even had a Go
> > wrapper 
> > which we used to apply the configuration to the box (set IP
> > addresses, 
> > connect to WiFi neworks, configure the serial ports etc.)
> >  
> > Is there some equivalent in the Yocto world?
> >  
> 
> The OpenWRT wiki has a section on porting UCI to different linux
> distributions [1], but you can probably skip that completely.
> Searching for UCI in the recipe index [2] yields a result from the
> meta-openwrt [3] layer. I would start with adding that layer and
> using the UCI recipe from there.
> 
> [1]: https://openwrt.org/docs/techref/uci#usage_outside_of_openwrt
> [2]:
> https://layers.openembedded.org/layerindex/branch/master/recipes/?q=uci
> [3]: https://github.com/kraj/meta-openwrt
> 
> > I would like to avoid generating the file content in the /etc 
> > directory by hand and firing „restart“ commands to the
> > corresponding 
> > services, if there isn’t a better way.
> >  
> > Help greatly appreciated :-)
> >  
> > Chris
> > 
> 
> 
>