Chapter 18. Configuring network settings by using RHEL system roles

Procedure

1. Edit the ~/inventory file, and append the host-specific settings to the host entries:

   managed-node-01.example.com interface=enp1s0 ip_v4=192.0.2.1/24 ip_v6=2001:db8:1::1/64 gateway_v4=192.0.2.254 gateway_v6=2001:db8:1::fffe
   
   managed-node-02.example.com interface=enp1s0 ip_v4=192.0.2.2/24 ip_v6=2001:db8:1::2/64 gateway_v4=192.0.2.254 gateway_v6=2001:db8:1::fffe

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

   ---
   - name: Configure the network
     hosts: managed-node-01.example.com,managed-node-02.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: "{{ interface }}"
               interface_name: "{{ interface }}"
               type: ethernet
               autoconnect: yes
               ip:
                 address:
                   - "{{ ip_v4 }}"
                   - "{{ ip_v6 }}"
                 gateway4: "{{ gateway_v4 }}"
                 gateway6: "{{ gateway_v6 }}"
                 dns:
                   - 192.0.2.200
                   - 2001:db8:1::ffbb
                 dns_search:
                   - example.com
               state: up

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   This playbook reads certain values dynamically for each host from the inventory file and uses static values in the playbook for settings which are the same for all hosts.

   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.

3. Validate the playbook syntax:

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

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

4. Run the playbook:

   $ ansible-playbook ~/playbook.yml

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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

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   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

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   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

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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 dynamic IP address settings
         ansible.builtin.include_role:
           name: redhat.rhel_system_roles.network
         vars:
           network_connections:
             - name: enp1s0
               interface_name: enp1s0
               type: ethernet
               autoconnect: yes
               ip:
                 dhcp4: yes
                 auto6: yes
               state: up

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   The settings specified in the example playbook include the following:

   dhcp4: yes

   Enables automatic IPv4 address assignment from DHCP, PPP, or similar services.

   auto6: yes

   Enables IPv6 auto-configuration. By default, NetworkManager uses Router Advertisements. If the router announces the managed flag, NetworkManager requests an IPv6 address and prefix from a DHCPv6 server.

   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

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   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

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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 dynamic 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:
                 dhcp4: yes
                 auto6: yes
               state: up

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   The settings specified in the example playbook include the following:

   match: path

   Defines that a condition must be met in order to apply the settings. You can only use this variable with the path option.

   path: <path_and_expressions>

   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.

   dhcp4: yes

   Enables automatic IPv4 address assignment from DHCP, PPP, or similar services.

   auto6: yes

   Enables IPv6 auto-configuration. By default, NetworkManager uses Router Advertisements. If the router announces the managed flag, NetworkManager requests an IPv6 address and prefix from a DHCPv6 server.

   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

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   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

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Procedure

1. Store your sensitive variables in an encrypted file:

   1. Create the vault:

      $ ansible-vault create ~/vault.yml
      New Vault password: <vault_password>
      Confirm New Vault password: <vault_password>

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   2. After the ansible-vault create command opens an editor, enter the sensitive data in the <key>: <value> format:

      pwd: <password>

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   3. Save the changes, and close the editor. Ansible encrypts the data in the vault.

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

   ---
   - name: Configure an Ethernet connection with 802.1X authentication
     hosts: managed-node-01.example.com
     vars_files:
       - ~/vault.yml
     tasks:
       - name: Copy client key for 802.1X authentication
         ansible.builtin.copy:
           src: "/srv/data/client.key"
           dest: "/etc/pki/tls/private/client.key"
           mode: 0600
   
       - name: Copy client certificate for 802.1X authentication
         ansible.builtin.copy:
           src: "/srv/data/client.crt"
           dest: "/etc/pki/tls/certs/client.crt"
   
       - name: Copy CA certificate for 802.1X authentication
         ansible.builtin.copy:
           src: "/srv/data/ca.crt"
           dest: "/etc/pki/ca-trust/source/anchors/ca.crt"
   
       - name: Ethernet connection profile with static IP address settings and 802.1X
         ansible.builtin.include_role:
           name: redhat.rhel_system_roles.network
         vars:
           network_connections:
             - name: enp1s0
               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
               ieee802_1x:
                 identity: <user_name>
                 eap: tls
                 private_key: "/etc/pki/tls/private/client.key"
                 private_key_password: "{{ pwd }}"
                 client_cert: "/etc/pki/tls/certs/client.crt"
                 ca_cert: "/etc/pki/ca-trust/source/anchors/ca.crt"
                 domain_suffix_match: example.com
               state: up

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   The settings specified in the example playbook include the following:

   ieee802_1x

   This variable contains the 802.1X-related settings.

   eap: tls

   Configures the profile to use the certificate-based TLS authentication method for the Extensible Authentication Protocol (EAP).

   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.

3. Validate the playbook syntax:

   $ ansible-playbook --ask-vault-pass --syntax-check ~/playbook.yml

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

4. Run the playbook:

   $ ansible-playbook --ask-vault-pass ~/playbook.yml

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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: Bond connection profile with two Ethernet ports
         ansible.builtin.include_role:
           name: redhat.rhel_system_roles.network
         vars:
           network_connections:
             # Bond profile
             - name: bond0
               type: bond
               interface_name: bond0
               ip:
                 dhcp4: yes
                 auto6: yes
               bond:
                 mode: active-backup
               state: up
   
             # Port profile for the 1st Ethernet device
             - name: bond0-port1
               interface_name: enp7s0
               type: ethernet
               controller: bond0
               state: up
   
             # Port profile for the 2nd Ethernet device
             - name: bond0-port2
               interface_name: enp8s0
               type: ethernet
               controller: bond0
               state: up

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   The settings specified in the example playbook include the following:

   type: <profile_type>

   Sets the type of the profile to create. The example playbook creates three connection profiles: One for the bond and two for the Ethernet devices.

   dhcp4: yes

   Enables automatic IPv4 address assignment from DHCP, PPP, or similar services.

   auto6: yes

   Enables IPv6 auto-configuration. By default, NetworkManager uses Router Advertisements. If the router announces the managed flag, NetworkManager requests an IPv6 address and prefix from a DHCPv6 server.

   mode: <bond_mode>

   Sets the bonding mode. Possible values are:

   • balance-rr (default)
   • active-backup
   • balance-xor
   • broadcast
   • 802.3ad
   • balance-tlb
   • balance-alb.

   Depending on the mode you set, you need to set additional variables in the playbook.

   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

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   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

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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: VLAN connection profile with Ethernet port
         ansible.builtin.include_role:
           name: redhat.rhel_system_roles.network
         vars:
           network_connections:
             # Ethernet profile
             - name: enp1s0
               type: ethernet
               interface_name: enp1s0
               autoconnect: yes
               state: up
               ip:
                 dhcp4: no
                 auto6: no
   
             # VLAN profile
             - name: enp1s0.10
               type: vlan
               vlan:
                 id: 10
               ip:
                 dhcp4: yes
                 auto6: yes
               parent: enp1s0
               state: up

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   The settings specified in the example playbook include the following:

   type: <profile_type>

   Sets the type of the profile to create. The example playbook creates two connection profiles: One for the parent Ethernet device and one for the VLAN device.

   dhcp4: <value>

   If set to yes, automatic IPv4 address assignment from DHCP, PPP, or similar services is enabled. Disable the IP address configuration on the parent device.

   auto6: <value>

   If set to yes, IPv6 auto-configuration is enabled. In this case, by default, NetworkManager uses Router Advertisements and, if the router announces the managed flag, NetworkManager requests an IPv6 address and prefix from a DHCPv6 server. Disable the IP address configuration on the parent device.

   parent: <parent_device>

   Sets the parent device of the VLAN connection profile. In the example, the parent is the Ethernet interface.

   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

   Copy to Clipboard Toggle word wrap

   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

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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: Bridge connection profile with two Ethernet ports
         ansible.builtin.include_role:
           name: redhat.rhel_system_roles.network
         vars:
           network_connections:
             # Bridge profile
             - name: bridge0
               type: bridge
               interface_name: bridge0
               ip:
                 dhcp4: yes
                 auto6: yes
               state: up
   
             # Port profile for the 1st Ethernet device
             - name: bridge0-port1
               interface_name: enp7s0
               type: ethernet
               controller: bridge0
               port_type: bridge
               state: up
   
             # Port profile for the 2nd Ethernet device
             - name: bridge0-port2
               interface_name: enp8s0
               type: ethernet
               controller: bridge0
               port_type: bridge
               state: up

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   The settings specified in the example playbook include the following:

   type: <profile_type>

   Sets the type of the profile to create. The example playbook creates three connection profiles: One for the bridge and two for the Ethernet devices.

   dhcp4: yes

   Enables automatic IPv4 address assignment from DHCP, PPP, or similar services.

   auto6: yes

   Enables IPv6 auto-configuration. By default, NetworkManager uses Router Advertisements. If the router announces the managed flag, NetworkManager requests an IPv6 address and prefix from a DHCPv6 server.

   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

   Copy to Clipboard Toggle word wrap

   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

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Verification

1. Display the link status of Ethernet devices that are ports of a specific bridge:

   # ansible managed-node-01.example.com -m command -a 'ip link show master bridge0'
   managed-node-01.example.com | CHANGED | rc=0 >>
   3: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master bridge0 state UP mode DEFAULT group default qlen 1000
       link/ether 52:54:00:62:61:0e brd ff:ff:ff:ff:ff:ff
   4: enp8s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel master bridge0 state UP mode DEFAULT group default qlen 1000
       link/ether 52:54:00:9e:f1:ce brd ff:ff:ff:ff:ff:ff

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2. Display the status of Ethernet devices that are ports of any bridge device:

   # ansible managed-node-01.example.com -m command -a 'bridge link show'
   managed-node-01.example.com | CHANGED | rc=0 >>
   3: enp7s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master bridge0 state forwarding priority 32 cost 100
   4: enp8s0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 master bridge0 state listening priority 32 cost 100

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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: enp1s0
               type: ethernet
               autoconnect: yes
               ip:
                 address:
                   - 198.51.100.20/24
                   - 2001:db8:1::1/64
                 gateway4: 198.51.100.254
                 gateway6: 2001:db8:1::fffe
                 dns:
                   - 198.51.100.200
                   - 2001:db8:1::ffbb
                 dns_search:
                   - example.com
               state: up

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   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

   Copy to Clipboard Toggle word wrap

   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

   Copy to Clipboard Toggle word wrap

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: enp7s0
               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
                 route:
                   - network: 198.51.100.0
                     prefix: 24
                     gateway: 192.0.2.10
                   - network: '2001:db8:2::'
                     prefix: 64
                     gateway: 2001:db8:1::10
               state: up

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   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

   Copy to Clipboard Toggle word wrap

   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

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Verification

1. Display the IPv4 routes:

   # ansible managed-node-01.example.com -m command -a 'ip -4 route'
   managed-node-01.example.com | CHANGED | rc=0 >>
   ...
   198.51.100.0/24 via 192.0.2.10 dev enp7s0

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2. Display the IPv6 routes:

   # ansible managed-node-01.example.com -m command -a 'ip -6 route'
   managed-node-01.example.com | CHANGED | rc=0 >>
   ...
   2001:db8:2::/64 via 2001:db8:1::10 dev enp7s0 metric 1024 pref medium

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Procedure

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

   ---
   - name: Configuring policy-based routing
     hosts: managed-node-01.example.com
     tasks:
       - name: Routing traffic from a specific subnet to a different default gateway
         ansible.builtin.include_role:
           name: redhat.rhel_system_roles.network
         vars:
           network_connections:
             - name: Provider-A
               interface_name: enp7s0
               type: ethernet
               autoconnect: True
               ip:
                 address:
                   - 198.51.100.1/30
                 gateway4: 198.51.100.2
                 dns:
                   - 198.51.100.200
               state: up
               zone: external
   
             - name: Provider-B
               interface_name: enp1s0
               type: ethernet
               autoconnect: True
               ip:
                 address:
                   - 192.0.2.1/30
                 route:
                   - network: 0.0.0.0
                     prefix: 0
                     gateway: 192.0.2.2
                     table: 5000
               state: up
               zone: external
   
             - name: Internal-Workstations
               interface_name: enp8s0
               type: ethernet
               autoconnect: True
               ip:
                 address:
                   - 10.0.0.1/24
                 route:
                   - network: 10.0.0.0
                     prefix: 24
                     table: 5000
                 routing_rule:
                   - priority: 5
                     from: 10.0.0.0/24
                     table: 5000
               state: up
               zone: trusted
   
             - name: Servers
               interface_name: enp9s0
               type: ethernet
               autoconnect: True
               ip:
                 address:
                   - 203.0.113.1/24
               state: up
               zone: trusted

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   The settings specified in the example playbook include the following:

   table: <value>

   Assigns the route from the same list entry as the table variable to the specified routing table.

   routing_rule: <list>

   Defines the priority of the specified routing rule and from a connection profile to which routing table the rule is assigned.

   zone: <zone_name>

   Assigns the network interface from a connection profile to the specified firewalld zone.

   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

   Copy to Clipboard Toggle word wrap

   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

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Verification

1. On a RHEL host in the internal workstation subnet:

   1. Install the traceroute package:

      # yum install traceroute

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   2. Use the traceroute utility to display the route to a host on the internet:

      # traceroute redhat.com
      traceroute to redhat.com (209.132.183.105), 30 hops max, 60 byte packets
       1  10.0.0.1 (10.0.0.1)     0.337 ms  0.260 ms  0.223 ms
       2  192.0.2.2 (192.0.2.2)   0.884 ms  1.066 ms  1.248 ms
       ...

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      The output of the command displays that the router sends packets over 192.0.2.1, which is the network of provider B.

2. On a RHEL host in the server subnet:

   1. Install the traceroute package:

      # yum install traceroute

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   2. Use the traceroute utility to display the route to a host on the internet:

      # traceroute redhat.com
      traceroute to redhat.com (209.132.183.105), 30 hops max, 60 byte packets
       1  203.0.113.1 (203.0.113.1)    2.179 ms  2.073 ms  1.944 ms
       2  198.51.100.2 (198.51.100.2)  1.868 ms  1.798 ms  1.549 ms
       ...

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      The output of the command displays that the router sends packets over 198.51.100.2, which is the network of provider A.

3. On the RHEL router that you configured using the RHEL system role:

   1. Display the rule list:

      # ip rule list
      0:      from all lookup local
      5:    from 10.0.0.0/24 lookup 5000
      32766:  from all lookup main
      32767:  from all lookup default

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      By default, RHEL contains rules for the tables local, main, and default.

   2. Display the routes in table 5000:

      # ip route list table 5000
      0.0.0.0/0 via 192.0.2.2 dev enp1s0 proto static metric 100
      10.0.0.0/24 dev enp8s0 proto static scope link src 192.0.2.1 metric 102

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   3. Display the interfaces and firewall zones:

      # firewall-cmd --get-active-zones
      external
        interfaces: enp1s0 enp7s0
      trusted
        interfaces: enp8s0 enp9s0

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   4. Verify that the external zone has masquerading enabled:

      # firewall-cmd --info-zone=external
      external (active)
        target: default
        icmp-block-inversion: no
        interfaces: enp1s0 enp7s0
        sources:
        services: ssh
        ports:
        protocols:
        masquerade: yes
        ...

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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 dynamic IP address settings and offload features
         ansible.builtin.include_role:
           name: redhat.rhel_system_roles.network
         vars:
           network_connections:
             - name: enp1s0
               type: ethernet
               autoconnect: yes
               ip:
                 dhcp4: yes
                 auto6: yes
               ethtool:
                 features:
                   gro: no
                   gso: yes
                   tx_sctp_segmentation: no
               state: up

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   The settings specified in the example playbook include the following:

   gro: no

   Disables Generic receive offload (GRO).

   gso: yes

   Enables Generic segmentation offload (GSO).

   tx_sctp_segmentation: no

   Disables TX stream control transmission protocol (SCTP) segmentation.

   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

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   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

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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 dynamic IP address settings and coalesce settings
         ansible.builtin.include_role:
           name: redhat.rhel_system_roles.network
         vars:
           network_connections:
             - name: enp1s0
               type: ethernet
               autoconnect: yes
               ip:
                 dhcp4: yes
                 auto6: yes
               ethtool:
                 coalesce:
                   rx_frames: 128
                   tx_frames: 128
               state: up

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   The settings specified in the example playbook include the following:

   rx_frames: <value>

   Sets the number of RX frames.

   gso: <value>

   Sets the number of TX frames.

   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

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   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

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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 dynamic IP address setting and increased ring buffer sizes
         ansible.builtin.include_role:
           name: redhat.rhel_system_roles.network
         vars:
           network_connections:
             - name: enp1s0
               type: ethernet
               autoconnect: yes
               ip:
                 dhcp4: yes
                 auto6: yes
               ethtool:
                 ring:
                   rx: 4096
                   tx: 4096
               state: up

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   The settings specified in the example playbook include the following:

   rx: <value>

   Sets the maximum number of received ring buffer entries.

   tx: <value>

   Sets the maximum number of transmitted ring buffer entries.

   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

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   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

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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: IPoIB connection profile with static IP address settings
         ansible.builtin.include_role:
           name: redhat.rhel_system_roles.network
         vars:
           network_connections:
             # InfiniBand connection mlx4_ib0
             - name: mlx4_ib0
               interface_name: mlx4_ib0
               type: infiniband
   
             # IPoIB device mlx4_ib0.8002 on top of mlx4_ib0
             - name: mlx4_ib0.8002
               type: infiniband
               autoconnect: yes
               infiniband:
                 p_key: 0x8002
                 transport_mode: datagram
               parent: mlx4_ib0
               ip:
                 address:
                   - 192.0.2.1/24
                   - 2001:db8:1::1/64
               state: up

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   The settings specified in the example playbook include the following:

   type: <profile_type>

   Sets the type of the profile to create. The example playbook creates two connection profiles: One for the InfiniBand connection and one for the IPoIB device.

   parent: <parent_device>

   Sets the parent device of the IPoIB connection profile.

   p_key: <value>

   Sets the InfiniBand partition key. If you set this variable, do not set interface_name on the IPoIB device.

   transport_mode: <mode>

   Sets the IPoIB connection operation mode. You can set this variable to datagram (default) or connected.

   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

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   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

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Verification

1. Display the IP settings of the mlx4_ib0.8002 device:

   # ansible managed-node-01.example.com -m command -a 'ip address show mlx4_ib0.8002'
   managed-node-01.example.com | CHANGED | rc=0 >>
   ...
   inet 192.0.2.1/24 brd 192.0.2.255 scope global noprefixroute ib0.8002
      valid_lft forever preferred_lft forever
   inet6 2001:db8:1::1/64 scope link tentative noprefixroute
      valid_lft forever preferred_lft forever

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2. Display the partition key (P_Key) of the mlx4_ib0.8002 device:

   # ansible managed-node-01.example.com -m command -a 'cat /sys/class/net/mlx4_ib0.8002/pkey'
   managed-node-01.example.com | CHANGED | rc=0 >>
   0x8002

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3. Display the mode of the mlx4_ib0.8002 device:

   # ansible managed-node-01.example.com -m command -a 'cat /sys/class/net/mlx4_ib0.8002/mode'
   managed-node-01.example.com | CHANGED | rc=0 >>
   datagram

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