roles/simulate-fabric/files/simulate-fabric-playbook.yml

---
- hosts: nova-compute-1
  remote_user: ubuntu
  become: yes

  tasks:
    - name: Include configuration vars
      include_vars: simulate-fabric-vars.yml

    - name: Install prerequisites
      apt:
        name={{ item }}
        update_cache=yes
        cache_valid_time=3600
      become: yes
      with_items:
       - bridge-utils

    - name: Create bridges
      when: "ansible_{{ item.name }} is not defined"
      command: brctl addbr "{{ item.name }}"
      with_items: "{{ simfabric_bridges }}"

    # note, not idempotent if failed between prior step and this step
    - name: Set IP addresses to bridges
      when: "ansible_{{ item.0.name }} is not defined"
      command: "ip addr add {{ item.1 }} dev {{ item.0.name }}"
      with_subelements:
       - "{{ simfabric_bridges }}"
       - addresses

    - name: Run setup again to obtain bridge info
      setup:

    - name: Start bridges
      when: "not ansible_{{ item.name }}.active"
      command: "ip link set dev {{ item.name }} up"
      with_items: "{{ simfabric_bridges }}"

    - name: Create ip links
      when: "ansible_{{ item.name }}0 is not defined"
      command: "ip link add address {{ item.mac }} type {{ item.name }}"
      with_items: "{{ simfabric_links }}"

    - name: Run setup again to obtain link info
      setup:

    - name: Start interfaces
      when: "not ansible_{{ item }}.active"
      command: "ip link set dev {{ item }} up"
      with_items: "{{ simfabric_interfaces }}"

    - name: Add interfaces to bridges
      when: "not item.1 in ansible_{{ item.0.name }}.interfaces"
      command: "brctl addif {{ item.0.name }} {{ item.1 }}"
      with_subelements:
       - "{{ simfabric_bridges }}"
       - interfaces

    - name: Check for iptables rule
      command: "iptables -t nat -C POSTROUTING -s 10.168.0.0/16 ! -d 10.168.0.0/16 -j MASQUERADE"
      register: iptables_check
      failed_when: "iptables_check|failed and 'No chain/target/match by that name' not in iptables_check.stderr"

    - name: Create iptables rule
      when: "iptables_check.rc != 0"
      command: "iptables -t nat -A POSTROUTING -s 10.168.0.0/16 ! -d 10.168.0.0/16 -j MASQUERADE"

# the below will likely work when this pull makes it into ansible:
# https://github.com/ansible/ansible-modules-extras/pull/1685
#   - name: Configure iptables
#     iptables: "table={{ item.table }} chain={{ item.chain }} source={{ item.source }} destination={{ item.dest }} jump={{ item.jump }}"
#     with_items: "{{ simfabric_iptables }}"

    - name: Set kernel sysctl values
      sysctl:
        name="{{ item.name }}"
        value="{{ item.value }}"
        sysctl_set=yes
        state=present
        reload=yes
      with_items: "{{ simfabric_sysctl }}"