zuul-jobs/roles/multi-node-bridge/tasks/common.yaml

- name: Include OS-specific variables
  include_vars: "{{ zj_distro_os }}"
  with_first_found:
    - "{{ ansible_distribution }}.yaml"
    - "{{ ansible_os_family }}.yaml"
    - "default.yaml"
  loop_control:
    loop_var: zj_distro_os

# openvswitch for CentOS is available from the RDO repositories.
# We're setting it up manually to prevent centos-release-openstack or rdo-release
# from installing repositories we don't need.
- when:
    - ansible_os_family == "RedHat"
    - ansible_distribution not in ["Fedora", "RedHat"]
  become: yes
  block:
    - name: Set up RDO GPG key
      copy:
        src: RPM-GPG-KEY-CentOS-SIG-Cloud
        dest: /tmp/RPM-GPG-KEY-CentOS-SIG-Cloud
        mode: 0644

    - name: Set up RDO repository
      template:
        src: zuul-multi-node-bridge-ovs.repo.j2
        dest: /etc/yum.repos.d/zuul-multi-node-bridge-ovs.repo
        mode: 0644

- name: Set package.use values for OVS on Gentoo
  become: yes
  lineinfile:
    path: /etc/portage/package.use/ovs
    line: "{{ zj_item.line }}"
    create: yes
    mode: 0644
  loop:
    - { line: 'dev-python/twisted conch  # for openvswitch' }
    - { line: 'sys-apps/util-linux caps  # for openvswitch' }
    - { line: 'net-misc/openvswitch -modules  # ovs/gre are staticly built' }
  loop_control:
    loop_var: zj_item
  when:
    - ansible_distribution == 'Gentoo'

- name: Install openvswitch
  become: yes
  package:
    name: "{{ ovs_package }}"
    state: present
  when:
    - install_ovs|bool
    - ansible_distribution != 'Gentoo'

- name: Install openvswitch (Gentoo)
  become: yes
  package:
    name: "{{ ovs_package }}"
    state: present
    jobs: 8
  when:
    - install_ovs|bool
    - ansible_distribution == 'Gentoo'

- name: Ensure openvswitch is started
  become: yes
  service:
    name: "{{ ovs_service }}"
    state: started
    enabled: yes
  when:
    - install_ovs|bool

- name: Remove RDO repository files
  become: yes
  file:
    path: "{{ zj_rdo }}"
    state: absent
  loop:
    - /tmp/RPM-GPG-KEY-CentOS-SIG-Cloud
    - /etc/yum.repos.d/zuul-multi-node-bridge-ovs.repo
  loop_control:
    loop_var: zj_rdo
  when:
    - ansible_os_family == "RedHat"
    - ansible_distribution != "Fedora"

- name: Authorize the multi-node-bridge network
  become: yes
  iptables:
    state: present
    action: insert
    chain: INPUT
    ip_version: ipv4
    source: "{{ bridge_address_prefix }}.0/{{ bridge_address_subnet }}"
    destination: "{{ bridge_address_prefix }}.0/{{ bridge_address_subnet }}"
    jump: ACCEPT
  when:
    - bridge_configure_address | bool
    - bridge_authorize_internal_traffic | bool

- when: bridge_mtu is not defined
  block:
    - name: Determine bridge mtu
      shell: |
        # Find all interfaces with a permanent mac address type.
        # Permanent mac addrs imply "real" hardware and not interfaces we have
        # created through this system. This makes our MTU determination mostly
        # idempotent allowing us to create multiple overlays without
        # perpetually smaller MTUs.
        # find is used instead of ls as we can select the 'link' type with find
        # only the link type is needed because files do not have interface
        # properties and directories are not used for this area of /sys
        SMALLEST_MTU=""
        for X in $(find /sys/class/net/ -maxdepth 1 -type l -exec basename {} ';') ; do
            MAC_TYPE=$(cat "/sys/class/net/${X}/addr_assign_type")
            if [ "$MAC_TYPE" -ne "0" ] ; then
                # Type 0 is a permanent address implying a "real"
                # interface. We ignore other interfaces as that is what we
                # create here
                continue
            fi
            MTU=$(cat "/sys/class/net/${X}/mtu")
            if [ -z "$SMALLEST_MTU" ] || [ "$SMALLEST_MTU" -gt "$MTU" ] ; then
                SMALLEST_MTU=$MTU
            fi
        done
        # 70 byte overhead for vxlan + IPv6, which will also support IPv4
        echo $(( SMALLEST_MTU - 70 ))        
      args:
        executable: /bin/bash
      environment:
        PATH: '{{ ansible_env.PATH }}:/bin:/sbin:/usr/sbin'
      register: mtu_output
    - name: Set bridge_mtu
      set_fact:
        bridge_mtu: "{{ mtu_output.stdout }}"