c12s-kubespray/roles/network_plugin/flannel/tasks/main.yml

---
- include: pre-upgrade.yml

- name: Flannel | Verify if br_netfilter module exists
  shell: "modinfo br_netfilter"
  register: modinfo_br_netfilter
  failed_when: modinfo_br_netfilter.rc not in [0, 1]
  changed_when: false

- name: Flannel | Enable br_netfilter module
  modprobe:
    name: br_netfilter
    state: present
  when: modinfo_br_netfilter.rc == 0

# kube-proxy needs net.bridge.bridge-nf-call-iptables enabled when found if br_netfilter is not a module
- name: Flannel | Check if bridge-nf-call-iptables key exists
  command: "sysctl net.bridge.bridge-nf-call-iptables"
  failed_when: false
  changed_when: false
  register: sysctl_bridge_nf_call_iptables

- name: Flannel | Enable bridge-nf-call tables
  sysctl:
    name: "{{ item }}"
    state: present
    value: 1
    reload: yes
  when: modinfo_br_netfilter.rc == 1 and sysctl_bridge_nf_call_iptables.rc == 0
  with_items:
    - net.bridge.bridge-nf-call-iptables
    - net.bridge.bridge-nf-call-arptables
    - net.bridge.bridge-nf-call-ip6tables

- name: Flannel | Create cni-flannel-rbac manifest
  template:
    src: cni-flannel-rbac.yml.j2
    dest: "{{ kube_config_dir }}/cni-flannel-rbac.yml"
  register: flannel_rbac_manifest
  when: inventory_hostname == groups['kube-master'][0] and rbac_enabled

- name: Flannel | Create cni-flannel manifest
  template:
    src: cni-flannel.yml.j2
    dest: "{{ kube_config_dir }}/cni-flannel.yml"
  register: flannel_manifest
  when: inventory_hostname == groups['kube-master'][0]