network: Playbook to configure networking

The `network.yml` playbook is used to configure the network interfaces
on a managed node. Currently, it only supports the Red Hat configuration
style (i.e. `/etc/sysconfig/network-scripts/ifcfg-*` files).

network.yml

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+- hosts: RedHat
+  roles:
+  - rhel-network

roles/rhel-network/defaults/main.yml

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+default_bond_opts:
+  miimon: 100

roles/rhel-network/handlers/main.yml

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+- name: restart network
+  service:
+    name=network
+    state=restarted
+  when: not no_restart_network|d|bool

roles/rhel-network/tasks/main.yml

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+- name: ensure network devices are configured
+  template:
+    src=ifcfg.j2
+    dest=/etc/sysconfig/network-scripts/ifcfg-{{ item.ifname }}
+    mode=0644
+  with_items: '{{ network.interfaces }}'
+  notify: restart network
+
+- name: ensure ignored devices are not configured
+  file:
+    path=/etc/sysconfig/network-scripts/ifcfg-{{ item }}
+    state=absent
+  with_items: '{{ network.ignore_interfaces|d(()) }}'

roles/rhel-network/templates/ifcfg.j2

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+{#- vim: set ft=jinja : -#}
+DEVICE="{{ item.ifname }}"
+{% if item.enabled %}
+ONBOOT="yes"
+{% else %}
+ONBOOT="no"
+{% endif %}
+
+{% if item.mode == "auto" %}
+BOOTPROTO="dhcp"
+{% elif item.mode == "manual" %}
+BOOTPROTO="none"
+IPADDR="{{ item.addr }}"
+{% if item.mask is defined %}
+NETMASK="{{ item.mask }}"
+{% else %}
+PREFIX={{ item.prefix|d(24) }}
+{% endif %}
+{% if item.gateway is defined %}
+GATEWAY="{{ item.gateway }}"
+{% endif %}
+{% for dns in item.dns|d(()) %}
+DNS{{ loop.index }}="{{ dns }}"
+{% endfor %}
+{% if item.addr6 is defined %}
+IPV6ADDR="{{ item.addr6 }}"
+{% endif %}
+{% else %}
+BOOTPROTO="none"
+{% endif %}
+{% if item.dhcpv6 is defined %}
+{% if item.dhcpv6.enabled|d(True) %}
+DHCPV6C="yes"
+{% if item.dhcpv6.stateless|d(False) %}
+DHCPV6C_OPTIONS="-S"
+{% elif item.dhcpv6.temporary|d(False) %}
+DHCPV6C_OPTIONS="-T"
+{% elif item.dhcpv6.pd|d(False) %}
+DHCPV6C_OPTIONS="-P"
+{% endif %}
+{% endif %}
+{% endif %}
+{% if item.master|d %}
+
+SLAVE=yes
+MASTER={{ item.master }}
+{% endif %}
+{% if item.bond_opts|d %}
+
+BONDING_OPTS="{% for key, value in default_bond_opts|combine(item.bond_opts)|dictsort %}{{ key }}={{ value }}{% if not loop.last %} {% endif %}{% endfor %}"
+{% endif %}
+{% if item.vlan_id|d %}
+
+VLAN=yes
+VID={{ item.vlan_id }}
+{% if item.physdev|d %}
+PHYSDEV={{ item.physdev }}
+{% endif %}
+{% endif %}