DNS-setup for a host-only network

[Uli Schulze-Eyssing]

Hi,

I would like to create a network of 4 VMs, connected through a private network.

 node.vm.network :private_network, ip: "10.211.55.10[1-n]"
 node.vm.hostname = "vm[1-n]"

for every node did the job. It created a second private nic as expected.

I use the hostmanager plugin to exchange the hostnames in the /etc/hosts.

 

  config.hostmanager.enabled = false
  config.hostmanager.manage_host = true
  config.hostmanager.include_offline = true
  config.hostmanager.ignore_private_ip = false

  

and

  

 

 node.vm.provision :hostmanager  

Now I can ping the boxes among themselves by hostname, but for some reason I need complete dns.

 

ping vm[1-n]

works, but

host vm[1-n]

doesn´t work.

Two points: 

I´m running vagrant on a windows box. (vagrant-dns wouldn´t work) 

I don´t wanna have too much dependencies into the host setup in respect to future deployments.

So I remove hostmanager and try to set up a dnsmasq and a proper /etc/hosts on one of the VMs and a proper nameserver setting on the others.

So here I´m stuck. I cannot configure the resolving properly.

So, what I need on the "client" VMs is something like:

iface eth1 inet static
      address 10.211.55.102
      netmask 255.255.255.0
      dns-nameservers 10.211.55.100

 

in my /etc/networks/interfaces and disabling the nameserver for the first interface. The /etc/resolv.conf should look like:

# Dynamic resolv.conf(5) file for glibc resolver(3) generated by resolvconf(8)
#     DO NOT EDIT THIS FILE BY HAND -- YOUR CHANGES WILL BE OVERWRITTEN
nameserver 10.211.55.100
search localnet

By default, the first interface in in here at the first position.

 

Here my questions:

Ist there a way to specify the nameservers for my private networks? For example a parameter witch sets "dns-nameservers" in my /etc/networks/interfaces.

Is there a possibility to disable the nameserver of my first (default!?!) interface? This is the nat/dhcp interface configured by vagrant by default.

Thanks,

Uli

 

 

[Alvaro Miranda Aguilera]

Hello Uli.

1. On RedHat and Centos, you can stop the OS changing /etc/hosts, but in Ubuntu you can't.

So you can use a shell provisioner to set /etc/hosts.

Shell provisioner by default only run once, but you can specify to run always.

Have a look at his gist, I am not sure you need dnsmasq at all if you create the hosts in all the nodes.

https://gist.github.com/kikitux/805f58ae1f7fb30e5109

If I did miss anything, please let me know :)

Alvaro.

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[Uli Schulze-Eyssing]

Hi Alvaro,

unfortunately I need dns-resolution. Only setting the /etc/host doesn't solve my problem. The reason is, that nslookup <name> or host <name> return nothing without dns.

But I solved is setting a dns-server in  /etc/dhcp/dhclient.conf.

The entry is:

supersede domain-name-servers yyy.yyy.yyy.yyy;

Than I run a dnsmasq on the host with this address.

I use shell provosioning to set the entry. It looks like:

$slave_script = <<SCRIPT
cat > /etc/dhcp/dhclient.conf <<EOF
supersede domain-name-servers <Server>;
EOF
sudo dhclient
SCRIPT

This fixed the issue for me.

Tanks,

Uli

[pixel fairy]

in the past i did this,

echo nameserver yyy.yyy.yyy.yyy > /etc/resolv.conf

which always worked, but i never thought about if dhcpd would run in the background and overwrite that.