cloud-init "nocloud" networking setup

README.md

cloud-init is absolute cancer. Its code is horrible. It has no documentation at all.

It took me 5 fucking hours to figure out how to properly configure networking on recent cloud-init (Ubuntu 16.04 cloud image) with local datasource.

It's not mentioned anywhere you need to provide dsmode: local. (but only if you need network-config, besides that everything is fine; someone below noted that -m flag does the same thing, good to know) Of course nobody needs documentation for network-config format either. (cloudinit/net/__init__.py is a protip, enjoy the feces dive)

Oh, and by the way - no, it's not possible to provide network-config to uvt-kvm without patching shit.

Use -N flag for cloud-localds for network-config.

meta-data

dsmode: local
# ↑ THIS. SHIT.

network-config

---
version: 1
config:
 - type: physical
   name: ens3
   subnets:
    - control: auto
      type: static
      address: |
         192.168.21.37
             pre-up echo xD > /tmp/yesitsthereyo # quality configuration injection, real thing

user-data

#cloud-config
chpasswd:
  list: |
    root:password
  expire: False
write_files:
  - content: |
    You don't really need that, just a bloody test.
  path: /root/test.txt

should i put this in the network-config file?

The network-config is not working, I only see the default cloud-init dhcp config.

the script you provided adds the 10-custom.yaml but there's still 50-cloud-init.yaml by default.

it doesn't change the IP, should I disable it?

@StudioLE , thanks for your suggestion.

I have this working now. 💯

#cloud-config
hostname: proxmox-test-control-plane
manage_etc_hosts: true
user: ionos
chpasswd:
  expire: false
users:
  - default
package_upgrade: true

write_files:
  - path: /etc/cloud/cloud.cfg.d/99-custom-networking.cfg
    permissions: '0644'
    content: |
      network: {config: disabled}

  - path: /etc/netplan/99-custom.yaml
    content: |
      network:
        version: 2
        renderer: networkd
        ethernets:
          eth0:
            dhcp4: no
            addresses:
            - 10.10.10.66/24
            routes:
            - to: default
              via: 10.10.10.1
            nameservers:
              addresses: [8.8.8.8, 8.8.4.4]

  - path: /var/lib/cloud/scripts/per-instance/30-network-configure
    permissions: 0o500
    content: |
        #!/bin/bash
        set -uo pipefail
        
        echo-success () {
          echo -e "\e[32m ✔  $1\e[0m" >&2
        }
        
        echo-information () {
          echo -e "\e[34m ⓘ  $1\e[0m" >&2
        }
        
        echo-error () {
          echo -e "\e[31m !  $1\e[0m" >&2
        }
        
        echo-warning () {
          echo -e "\e[33m ⚠  $1\e[0m" >&2
        }
        
        echo-subsidiary () {
          echo -e "\e[37m    $1\e[0m" >&2
        }
        
        echo-step () {
          echo -e "\e[0m »  $1\e[0m" >&2
        }
        
        echo-step "Applying Netplan configuration"
        if netplan apply
        then
          echo-success "Applied Netplan configuration"
        else
          echo-error "Failed to apply netplan configuration"
        fi

@StudioLE I want to set a static ip address with nocloud but that doesn't work, on proxmox. I'm mounting the cloud-init data using an ISO cd drive. Do you have a workaround?
I have put this in metadata and user data, but that doesn't work.

network:
    version: 2
    ethernets:
        eth0:
            match:     
              name: en*
            set-name: eth0
            addresses: [10.10.10.84/32]
            gateway4: 10.10.10.1
            nameservers:
              addresses:
                - 8.8.8.8
                - 8.8.4.4

The indentation isn't consistent in your example, I'm not sure if that may be causing issues? In some places you're using 4 spaces and others 2 spaces.

Also worth noting that gateway4: is deprecated you should use default routes instead.

Rewriting your example would look something like this:

network:
  version: 2
  ethernets:
    eth0:
      match:     
        name: en*
      set-name: eth0
      addresses: 
      - 10.10.10.84/32
      routes:
      - to: default
        via: 10.10.10.1
      nameservers:
        addresses:
          - 8.8.8.8
          - 8.8.4.4

Thank you!
Saved me hours of hair pulling trying to build images without dhcpd.