[Samba] Samba and dnsmasq

[Robert Marcano]

On 12/18/18 3:28 PM, Nicolas via samba wrote:
> Hello everyone !
> 
> Well, I'm setting up a 'new' box with samba 4.9.3 on Ubuntu 18.04
> 
> Idea is to use Host OS for Domain Controler (dc1.smb.domain.tld) and a 
> LXC container (ubuntu 18.04 too) as Domain Member with File Server 
> (fs.smb.domain.tld).

As someone who runs a similar setup (an OCI container as a DC and host 
as domain member), I recommend your host to have two IPs, one for the 
host services and one for services published by the container. services 
with ports that collide between both environments should be configured 
to bind to explicit IP addresses.

In my case the host runs an instance of Bind DNS for non AD related 
domains, so I have to modify the Bind configuration to only bind to the 
host public IP and not bind the the container dedicated public IP.

> 
> Administration through Windows OS will be done with a Qemu KVM.
> 
> Bad thing is that I get :
> 
>> Failed to bind to 0.0.0.0:53 TCP - NT_STATUS_ADDRESS_ALREADY_ASSOCIATED
> 
> as dnsmasq is using port 53 :
> 
>> netstat -tulpn | grep ":53"
>> tcp        0      0 192.168.122.1:53 0.0.0.0:* LISTEN      1283/dnsmasq
>> tcp        0      0 10.0.3.1:53 0.0.0.0:*               LISTEN 
>> 1062/dnsmasq
>> tcp6       0      0 :::53 :::*                    LISTEN 1161/samba: 
>> task[dn
>> udp        0      0 192.168.122.1:53 
>> 0.0.0.0:*                           1283/dnsmasq
>> udp        0      0 10.0.3.1:53 0.0.0.0:* 1062/dnsmasq
>> udp6       0      0 :::53 :::* 1161/samba: task[dn
> Is there known solutions to resolve this, or should I use this kind of 
> method :
> 
> https://medium.com/matematica-e-informatica/dnsmasq-and-samba4-ad-dc-74e69d46a1db 
> 
> 
> Thanks in advance for your time.
> 
> Nicolas
> 
>