Issues with nameserver and default route

Archive RancherOS
1

I’m just getting started with RancherOS under KVM/Qemu. Looks ideal for what I need but I’m having some network issues.

Firstly it’s not getting the default route or nameservers from dhcp. It is getting an IP address and even a static route though. This works with normal VMs. My subnet in dhcpd.conf is this:

subnet 10.20.13.0 netmask 255.255.255.0 {
       option domain-name-servers 10.20.13.10,10.20.15.10;
       option domain-name "domain.com";
       option routers 10.20.13.1;
       range  10.20.13.150 10.20.13.250;
       option rfc3442-classless-static-routes 24, 10, 20, 11, 10, 20, 13, 9;
       option ms-classless-static-routes 24, 10, 20, 11, 10, 20, 13, 9;
       ignore-client-uids true;
}

So I would expect a default route of 10.20.13.1 and the nameservers to be 10.20.13.10 and 10.20.15.10. However:

[rancher@ld3-rancheros-3 conf]$ cat /etc/resolv.conf
nameserver 8.8.8.8
nameserver 8.8.4.4
domain pibenchmark.com

[rancher@ld3-rancheros-3 conf]$ route
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
10.20.11.0      10.20.13.9      255.255.255.0   UG    203    0        0 eth0
10.20.13.0      *               255.255.255.0   U     203    0        0 eth0
172.17.0.0      *               255.255.0.0     U     0      0        0 docker0
172.18.0.0      *               255.255.0.0     U     0      0        0 docker-sys

As you see it’s got the static route but not the default. I’ve also tried to set the nameserver in rancher.yml but without success.

[rancher@ld3-rancheros-3 conf]$ sudo cat rancher.yml
network:
  dns:
    domain: pibenchmark.com
    nameserver: 10.20.13.10

Can anyone point me in the right direction?

2

Ah, managed to get there. I was slightly off with rancher.yml. This works:

network:
  dns:
    nameservers:
      - 10.20.13.10
      - 10.20.15.10
    search:
      - domain.com
      - domain.net
    domain: domain.com
  interfaces:
    eth0:
      dhcp: true
      gateway: 10.20.13.1