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nm-configurator

nm-configurator (or nmc) is a CLI tool which makes it easy to generate and apply NetworkManager configurations.

How to install it?

Download from release

Each release is published with nmc already built for amd64 and arm64 Linux systems:

$ curl -o nmc -L https://github.com/suse-edge/nm-configurator/releases/latest/download/nmc-linux-$(uname -m)
$ chmod +x nmc

Build from source

$ git clone https://github.com/suse-edge/nm-configurator.git
$ cd nm-configurator
$ cargo build --release # only supports Linux based systems

How to run it?

nmc depends on having the desired network state for all known nodes beforehand.

NetworkManager is using connection profiles defined as files stored under /etc/NetworkManager/system-connections.

In order to generate these config (*.nmconnection) files, nmc uses the nmstate library and requires a configuration directory as an input. This directory must contain the desired network state in one of the following file formats:

  1. A single or multiple <hostname>.yaml files containing the different configurations per host. This method requires specifying the MAC addresses of all Ethernet interfaces for each host in order to properly identify the relevant configurations when applying those.

  2. A single _all.yaml file containing the configurations to be applied to all hosts. This method does not depend on MAC address matching.

nmc is then able to apply the generated configurations by identifying and storing the relevant NetworkManager settings for a given host.

Typically used with Combustion in order to bootstrap multiple nodes using the same provisioning artefact instead of depending on different custom images per machine.

Per node configurations

Prepare desired states

mkdir -p desired-states

cat <<- EOF > desired-states/node1.yaml
interfaces:
- name: eth0
  type: ethernet
  state: up
  mac-address: FE:C4:05:42:8B:AA
  ipv4:
    address:
    - ip: 192.168.122.250
      prefix-length: 24
    enabled: true
  ipv6:
    address:
    - ip: 2001:db8::1:1
      prefix-length: 64
    enabled: true
EOF

cat <<- EOF > desired-states/node2.yaml
interfaces:
- name: eth1
  type: ethernet
  state: up
  mac-address: FE:C4:05:42:8B:AB
  ipv4:
    address:
    - ip: 192.168.123.250
      prefix-length: 24
    enabled: true
  ipv6:
    enabled: false
EOF

cat <<- EOF > desired-states/node3.yaml
interfaces:
- name: eth4
  type: ethernet
  state: up
  mac-address: FE:C4:05:42:8B:AC
  ipv4:
    address:
    - ip: 192.168.124.250
      prefix-length: 24
    enabled: true
  ipv6:
    enabled: false
EOF

Please refer to the official nmstate docs for more extensive examples.

Generate configurations

$ ./nmc generate --config-dir desired-states --output-dir network-config
[2024-05-20T23:37:10Z INFO  nmc::generate_conf] Generating config from "desired-states/node1.yaml"...
[2024-05-20T23:37:10Z INFO  nmc::generate_conf] Generating config from "desired-states/node2.yaml"...
[2024-05-20T23:37:10Z INFO  nmc::generate_conf] Generating config from "desired-states/node3.yaml"...
[2024-05-20T23:37:10Z INFO  nmc] Successfully generated and stored network config

$ find network-config | sort
network-config
network-config/host_config.yaml
network-config/node1
network-config/node1/eth0.nmconnection
network-config/node2
network-config/node2/eth1.nmconnection
network-config/node3
network-config/node3/eth4.nmconnection

There are separate directories for each host (identified by their input hostname.yaml). Each of these contains the configuration files for the desired network interfaces (e.g. eth0).

The host_config.yaml file on the root level maps the hosts to all of their preconfigured interfaces. This is necessary in order for nmc to identify which host it is running on when applying the network configurations later.

- hostname: node1
  interfaces:
    - logical_name: eth0
      mac_address: FE:C4:05:42:8B:AA
      interface_type: ethernet
- hostname: node2
  interfaces:
    - logical_name: eth1
      mac_address: FE:C4:05:42:8B:AB
      interface_type: ethernet
- hostname: node3
  interfaces:
    - logical_name: eth4
      mac_address: FE:C4:05:42:8B:AC
      interface_type: ethernet

Apply configurations

Simply copy the directory containing the results from nmc generate (network-config in the example above) to the target host.

$ ./nmc apply --config-dir network-config
[2024-05-20T23:43:01Z INFO  nmc::apply_conf] Identified host: node2
[2024-05-20T23:43:01Z INFO  nmc::apply_conf] Set hostname: node2
[2024-05-20T23:43:01Z INFO  nmc::apply_conf] Processing interface 'eth1'...
[2024-05-20T23:43:01Z INFO  nmc::apply_conf] Using interface name 'enp0s1' instead of the preconfigured 'eth1'
[2024-05-20T23:43:01Z INFO  nmc] Successfully applied config

$ ls /etc/NetworkManager/system-connections
enp0s1.nmconnection

NOTE: Interface names during the installation of nodes might differ from the preconfigured logical ones. This is expected and nmc will rely on the MAC addresses and use the actual names for the NetworkManager configurations instead e.g. settings for interface with a predefined logical name eth1 but actually named enp0s1 on the target node will automatically be adjusted and stored to /etc/NetworkManager/enp0s1.nmconnection.

Unified configurations

There are occasions where relying on known MAC addresses is not an option. In these cases we can opt for the so-called unified configurations which allows us to specify settings in an _all.yaml file which will then be applied across all provisioned nodes.

mkdir -p desired-states

cat <<- EOF > desired-states/_all.yaml
interfaces:
- name: eth0
  type: ethernet
  state: up
  ipv4:
    dhcp: true
    enabled: true
  ipv6:
    enabled: false
- name: eth1
  type: ethernet
  state: up
  ipv4:
    address:
    - ip: 10.0.0.1
      prefix-length: 24
    enabled: true
    dhcp: false
  ipv6:
    enabled: false
EOF

Generate configurations:

$ ./nmc generate --config-dir desired-states --output-dir network-config
[2024-05-27T07:23:20Z INFO  nmc::generate_conf] Generating config from "desired-states/_all.yaml"...
[2024-05-27T07:23:20Z INFO  nmc] Successfully generated and stored network config

$ find network-config | sort
network-config
network-config/_all
network-config/_all/eth0.nmconnection
network-config/_all/eth1.nmconnection

NOTE: The host_config.yaml file will not be present since host mapping is not necessary.

Apply configurations:

$ ./nmc apply --config-dir network-config
[2024-05-27T07:24:03Z INFO  nmc::apply_conf] Applying unified config...
[2024-05-27T07:24:03Z INFO  nmc::apply_conf] Copying file... "network-config/_all/eth0.nmconnection"
[2024-05-27T07:24:03Z INFO  nmc::apply_conf] Copying file... "network-config/_all/eth1.nmconnection"
[2024-05-27T07:24:03Z INFO  nmc] Successfully applied config

$ ls /etc/NetworkManager/system-connections
eth0.nmconnection eth1.nmconnection