3.19 and Routed networking mode configuration example needed

LXD
11

I am very sorry for the confusion. @tomp was kind enough to offer a very quick and comprehensive answer to my question, yet I discovered I had to delete this very question, because it included some network information I did not want to share. So this is a redacted version. If you are reading this thread, this is the question that tomp answered to in his comment above. I will study his answer and provide feedback in another comment, as soon as I find the time.

For me, this doesn’t happen. No routes are created inside the container. I used the commands you list below:

  1. lxc profile copy default rnic
  2. lxc profile device remove rnic eth0
  3. lxc profile device add rnic eth0 nic nictype=routed parent=ens3
  4. lxc init ubuntu:18.04 c1 -p rnic
  5. lxc config device override c1 eth0 ipv4.address=[MY-PUBLIC-IP]
  6. lxc start c1
  7. lxc exec c1 ip r

The last command turns up nothing. No routes are created inside the container. Can I set them up manually? Because when I use this as my /etc/netplan/50-cloud-init.yaml below, I can ping in and out, but nameserver resolution doesn’t work.

network:
    version: 2
    ethernets:
        eth0:
          addresses: [MY-PUBLIC-IP]
          nameservers:
            addresses: [8.8.8.8]
          routes:
            - to: 0.0.0.0/0
              via: 169.254.0.1
              on-link: true

And ip r only comes up like this:

default via 169.254.0.1 dev eth0 proto static onlink

The second line, beginning with the IP, is missing.

I use Bionic and the LXD Snap, currently at 3.22.

This Netplan gives me the same result:

network:
    version: 2
    ethernets:
        eth0:
          addresses: [MY-PUBLIC-IP]
          gateway4: 169.254.0.1
          nameservers:
            addresses: [8.8.8.8]

I can ping fine, but name resolution doesn’t work. And “ip r” only produces this line, nothing, more:

default via 169.254.0.1 dev eth0

When I change /etc/netplan/50-cloud-init.yaml inside the container to the following, I still don’t have dns, but some changes:

network:
    version: 2
    renderer: networkd
    ethernets:
        eth0:
          addresses: [My-Public-IP/32]
          dhcp4: no
          nameservers:
            addresses: [8.8.8.8]
          gateway4: 169.254.0.1
          routes:
            - to: 169.254.0.1/32
              via: 169.254.0.1
              scope: link

“ip r” now results in this:

default via 169.254.0.1 dev eth0 
default via 169.254.0.1 dev eth0 proto static 
169.254.0.1 dev eth0 scope link

But still no name resolution, even though it looks fine to me:

Link 73 (eth0)
      Current Scopes: DNS
       LLMNR setting: yes
MulticastDNS setting: no
      DNSSEC setting: no
    DNSSEC supported: no
         DNS Servers: 8.8.8.8

journalctl says:

Using degraded feature set (UDP) for DNS server 8.8.8.8.

or

Using degraded feature set (TCP) for DNS server 8.8.8.8.

Btw. this is a KVM guest rented from Netcup, where I purchased additional IPv4, which Netcup itself says should be added like this: https://www.netcup-wiki.de/wiki/Zus%C3%A4tzliche_IP_Adresse_konfigurieren