18.2. Configuring an Ethernet connection with a static IP address by using the network RHEL system role with a device path


You can use the network RHEL system role to configure an Ethernet connection with static IP addresses, gateways, and DNS settings, and assign them to a device based on its path instead of its name.

To connect a Red Hat Enterprise Linux host to an Ethernet network, create a NetworkManager connection profile for the network device. By using Ansible and the network RHEL system role, you can automate this process and remotely configure connection profiles on the hosts defined in a playbook.

Prerequisites

  • You have prepared the control node and the managed nodes.
  • You are logged in to the control node as a user who can run playbooks on the managed nodes.
  • The account you use to connect to the managed nodes has sudo permissions for these nodes.
  • A physical or virtual Ethernet device exists in the server’s configuration.
  • The managed nodes use NetworkManager to configure the network.
  • You know the path of the device. You can display the device path by using the udevadm info /sys/class/net/<device_name> | grep ID_PATH= command.

Procedure

  1. Create a playbook file, for example, ~/playbook.yml, with the following content:

    ---
    - name: Configure the network
      hosts: managed-node-01.example.com
      tasks:
        - name: Ethernet connection profile with static IP address settings
          ansible.builtin.include_role:
            name: redhat.rhel_system_roles.network
          vars:
            network_connections:
              - name: example
                match:
                  path:
                    - pci-0000:00:0[1-3].0
                    - '&!pci-0000:00:02.0'
                type: ethernet
                autoconnect: yes
                ip:
                  address:
                    - 192.0.2.1/24
                    - 2001:db8:1::1/64
                  gateway4: 192.0.2.254
                  gateway6: 2001:db8:1::fffe
                  dns:
                    - 192.0.2.200
                    - 2001:db8:1::ffbb
                  dns_search:
                    - example.com
                state: up

    The settings specified in the example playbook include the following:

    match
    Defines that a condition must be met in order to apply the settings. You can only use this variable with the path option.
    path
    Defines the persistent path of a device. You can set it as a fixed path or an expression. Its value can contain modifiers and wildcards. The example applies the settings to devices that match PCI ID 0000:00:0[1-3].0, but not 0000:00:02.0.

    For details about all variables used in the playbook, see the /usr/share/ansible/roles/rhel-system-roles.network/README.md file on the control node.

  2. Validate the playbook syntax:

    $ ansible-playbook --syntax-check ~/playbook.yml

    Note that this command only validates the syntax and does not protect against a wrong but valid configuration.

  3. Run the playbook:

    $ ansible-playbook ~/playbook.yml

Verification

  • Query the Ansible facts of the managed node and verify the active network settings:

    # ansible managed-node-01.example.com -m ansible.builtin.setup
    ...
            "ansible_default_ipv4": {
                "address": "192.0.2.1",
                "alias": "enp1s0",
                "broadcast": "192.0.2.255",
                "gateway": "192.0.2.254",
                "interface": "enp1s0",
                "macaddress": "52:54:00:17:b8:b6",
                "mtu": 1500,
                "netmask": "255.255.255.0",
                "network": "192.0.2.0",
                "prefix": "24",
                "type": "ether"
            },
            "ansible_default_ipv6": {
                "address": "2001:db8:1::1",
                "gateway": "2001:db8:1::fffe",
                "interface": "enp1s0",
                "macaddress": "52:54:00:17:b8:b6",
                "mtu": 1500,
                "prefix": "64",
                "scope": "global",
                "type": "ether"
            },
            ...
            "ansible_dns": {
                "nameservers": [
                    "192.0.2.1",
                    "2001:db8:1::ffbb"
                ],
                "search": [
                    "example.com"
                ]
            },
    ...
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