Re: [Ddclient-support] 'Run as' ddclient and Multiple Interfaces

[wimpunk <wi...@us...>]

Hi,

On 24/11/16 06:03, ca...@qu... wrote:
> Maybe I'm wrong but I thought I'd read somewhere that after the ddclient
> daemon starts, it's supposed to change from user root to ddclient.  But
> it's not.  And I'm not finding the code in the script to do that.  Am I
> imagining things?
> 

No, it doesn't change the owner.  If you want ddclient to be started as
a different user, you have to start it manually as a different user.  In
most cases this is done by using `su` in the init-script.

> Also I have ddclient set to get the IP off the interface, but depending
> on the phase of the moon, the humidity, and how much noise is in the
> room, the interface can come up variously as eth0, eth1, or eth2.
> (CentOS)  Is there any way to specify multiple interfaces in the config
> file?
> 

Unfortunately there is no possibility to let ddclient choose the
interface.  You could for example try to find out the correct interface
and add it as a parameter on startup.
At the other hand, you could try to find out if there's a way to get the
same interface name after every reboot.  On debian they fix this by
generating a persistent rule to udev. On my system it contains this:

# This file was automatically generated by the /lib/udev/write_net_rules
# program, run by the persistent-net-generator.rules rules file.
#
# You can modify it, as long as you keep each rule on a single
# line, and change only the value of the NAME= key.

# USB device 0x:0x (cdc_ether)
SUBSYSTEM=="net", ACTION=="add", DRIVERS=="?*",
ATTR{address}=="00:1e:10:1f:00:00", ATTR{dev_id}=="0x0",
ATTR{type}=="1", KERNEL=="eth*", NAME="eth1"

so it links the mac-address to the device name.
On SuSE you can do the link based on the pci location.  I don't know how
they save it in udev, I just know it can be done through yast2.

I hope this info can help you.

Kind regards

wimpunk.