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

[<ca...@qu...>]

Thanks.


On 11/23/2016 11:02 PM, wimpunk wrote:
> 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.
Ok I've set it up in systemd like this and it works fine:
/usr/local/lib/systemd/system/dynamic-dns.service

[Unit]
Description = spdyn.de dynamic DNS update service
After = nss-lookup.target network.target dhcpcd.service

[Service]
Type = simple
User = ddclient
ExecStart = /usr/sbin/ddclient -foreground
Restart = on-failure

# Security
PrivateTmp=yes
InaccessibleDirectories=/boot /home/backups /home/sleeper /media /mnt
/opt /root /srv /sys
ReadOnlyDirectories=/bin /etc /lib /lib64 /sbin /usr/bin /usr/sbin
CapabilityBoundingSet=~CAP_SYS_PTRACE
NoNewPrivileges=yes

[Install]
WantedBy=multi-user.target


>> 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.
This is my router in a Xen virtual machine, so it has to be automatic.

How about if I make two stanzas like this?  Will it error out, or fail
gracefully, on the missing interface?

use=if,                     if=eth0
protocol=dyndns2
server=update.spdyn.de
login=dro...@pr...
password=iTsasecret
darkheart.spdns.org

use=if,                     if=eth1
protocol=dyndns2
server=update.spdyn.de
login=dro...@pr...
password=iTsasecret
darkheart.spdns.org


I find that in RHEL renaming interfacen thus is not reliable.  It does
not react predictably.  Did in Debian, but not RHEL, and this is coming
to Debian.