okd/roles/flannel/tasks/main.yml

---
- name: Install flannel
  become: yes
  package:
    name: flannel
    state: present
  when: not openshift_is_atomic | bool
  register: result
  until: result is succeeded

- name: Set flannel etcd options
  become: yes
  lineinfile:
    dest: /etc/sysconfig/flanneld
    backrefs: yes
    regexp: "{{ item.regexp }}"
    line: "{{ item.line }}"
  with_items:
    - { regexp: "^(FLANNEL_ETCD=)", line: '\1{{ etcd_hosts|join(",") }}' }
    - { regexp: "^(FLANNEL_ETCD_ENDPOINTS=)", line: '\1{{ etcd_hosts|join(",") }}' }
    - { regexp: "^(FLANNEL_ETCD_KEY=)", line: '\1{{ flannel_etcd_key }}' }
    - { regexp: "^(FLANNEL_ETCD_PREFIX=)", line: '\1{{ flannel_etcd_key }}' }

- name: Set flannel options
  become: yes
  lineinfile:
    dest: /etc/sysconfig/flanneld
    backrefs: yes
    regexp: "^#?(FLANNEL_OPTIONS=)"
    line: '\1--iface {{ flannel_interface }} --etcd-cafile={{ etcd_peer_ca_file }} --etcd-keyfile={{ etcd_peer_key_file }} --etcd-certfile={{ etcd_peer_cert_file }}'

- name: Enable flanneld
  become: yes
  systemd:
    name: flanneld
    state: started
    enabled: yes
  register: start_result

- name: Remove docker bridge ip
  become: yes
  shell: ip a del `ip a show docker0 | grep "inet[[:space:]]" | awk '{print $2}'` dev docker0
  notify:
    - restart docker
    - restart node

- name: Enable Pod to Pod communication
  command: /sbin/iptables --wait -I FORWARD -d {{ openshift_cluster_network_cidr }} -i {{ flannel_interface }} -j ACCEPT -m comment --comment "Pod to Pod communication"
  notify:
    - save iptable rules

- name: Allow external network access
  command: /sbin/iptables -t nat -A POSTROUTING -o {{ flannel_interface }}  -j MASQUERADE -m comment --comment "Allow external network access"
  notify:
    - save iptable rules

- name: Allow DNS access
  command: /sbin/iptables -A OS_FIREWALL_ALLOW -p {{ item }} -m {{ item }} --dport 53 -j ACCEPT -m comment --comment "Allow DNS {{ item }} access"
  with_items:
    - "tcp"
    - "udp"
  notify:
    - save iptable rules