kubespray/roles/kubernetes/node/tasks/main.yml

---
- import_tasks: facts.yml
  tags:
    - facts

- import_tasks: pre_upgrade.yml
  tags:
    - kubelet

- name: Ensure /var/lib/cni exists
  file:
    path: /var/lib/cni
    state: directory
    mode: 0755

- import_tasks: install.yml
  tags:
    - kubelet

- import_tasks: nginx-proxy.yml
  when: is_kube_master == false and loadbalancer_apiserver_localhost and loadbalancer_apiserver_type == 'nginx'
  tags:
    - nginx

- import_tasks: haproxy.yml
  when: is_kube_master == false and loadbalancer_apiserver_localhost and loadbalancer_apiserver_type == 'haproxy'
  tags:
    - haproxy

- name: Make sure dynamic kubelet configuration directory is writeable
  file:
    path: "{{ dynamic_kubelet_configuration_dir }}"
    mode: 0600
    state: directory
  when: dynamic_kubelet_configuration

- name: Write kubelet config file (kubeadm)
  template:
    src: kubelet.kubeadm.env.j2
    dest: "{{ kube_config_dir }}/kubelet.env"
    backup: yes
  notify: restart kubelet
  tags:
    - kubelet
    - kubeadm

- name: Ensure nodePort range is reserved
  sysctl:
    name: net.ipv4.ip_local_reserved_ports
    value: "{{ kube_apiserver_node_port_range }}"
    sysctl_set: yes
    sysctl_file: "{{ sysctl_file_path }}"
    state: present
    reload: yes
  when: kube_apiserver_node_port_range is defined
  tags:
    - kube-proxy

- name: Verify if br_netfilter module exists
  shell: "modinfo br_netfilter"
  environment:
    PATH: "{{ ansible_env.PATH}}:/sbin"  # Make sure we can workaround RH's conservative path management
  register: modinfo_br_netfilter
  failed_when: modinfo_br_netfilter.rc not in [0, 1]
  changed_when: false

- name: Verify br_netfilter module path exists
  file:
    path: /etc/modules-load.d
    state: directory

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

- name: Persist br_netfilter module
  copy:
    dest: /etc/modules-load.d/kubespray-br_netfilter.conf
    content: br_netfilter
  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: 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: Enable bridge-nf-call tables
  sysctl:
    name: "{{ item }}"
    state: present
    sysctl_file: "{{ sysctl_file_path }}"
    value: 1
    reload: yes
  when: 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: Modprode Kernel Module for IPVS
  modprobe:
    name: "{{ item }}"
    state: present
  with_items:
    - ip_vs
    - ip_vs_rr
    - ip_vs_wrr
    - ip_vs_sh
  when: kube_proxy_mode == 'ipvs'
  tags:
    - kube-proxy

- name: Modprobe nf_conntrack_ipv4 for kernels < 4.19
  modprobe:
    name: nf_conntrack_ipv4
    state: present
  register: enable_nf_conntrack
  ignore_errors: yes
  when: kube_proxy_mode == 'ipvs'
  tags:
    - kube-proxy

- name: Modprobe nf_conntrack for kernels >= 4.19
  modprobe:
    name: nf_conntrack
    state: present
  when:
    - enable_nf_conntrack is failed
    - kube_proxy_mode == 'ipvs'
  tags:
    - kube-proxy

- name: Persist ip_vs modules
  copy:
    dest: /etc/modules-load.d/kube_proxy-ipvs.conf
    content: |
      ip_vs
      ip_vs_rr
      ip_vs_wrr
      ip_vs_sh
      {% if enable_nf_conntrack is failed -%}
      nf_conntrack
      {%-   else -%}
      nf_conntrack_ipv4
      {%-   endif -%}      
  when: kube_proxy_mode == 'ipvs'
  tags:
    - kube-proxy

- name: Purge proxy manifest for kubeadm or if proxy services being provided by other means, e.g. network_plugin
  file:
    path: "{{ kube_manifest_dir }}/kube-proxy.manifest"
    state: absent
  when:
    - kube_proxy_remove
  tags:
    - kube-proxy

- name: Cleanup kube-proxy leftovers from node
  command: "{{ bin_dir }}/hyperkube kube-proxy --cleanup"
  when:
    - kube_proxy_remove
  # `kube-proxy --cleanup`, being Ok as per shown WARNING, still returns 255 from above run (?)
  ignore_errors: true
  tags:
    - kube-proxy

- include_tasks: "{{ cloud_provider }}-credential-check.yml"
  when:
    - cloud_provider is defined
    - cloud_provider in [ 'openstack', 'azure', 'vsphere' ]
  tags:
    - cloud-provider
    - facts

- name: Write cacert file
  copy:
    src: "{{ openstack_cacert }}"
    dest: "{{ kube_config_dir }}/openstack-cacert.pem"
    group: "{{ kube_cert_group }}"
    mode: 0640
  when:
    - inventory_hostname in groups['k8s-cluster']
    - cloud_provider is defined
    - cloud_provider == 'openstack'
    - openstack_cacert is defined
    - openstack_cacert != ""
  tags:
    - cloud-provider

- name: Write cloud-config
  template:
    src: "{{ cloud_provider }}-cloud-config.j2"
    dest: "{{ kube_config_dir }}/cloud_config"
    group: "{{ kube_cert_group }}"
    mode: 0640
  when:
    - cloud_provider is defined
    - cloud_provider in [ 'openstack', 'azure', 'vsphere', 'aws' ]
  notify: restart kubelet
  tags:
    - cloud-provider

# reload-systemd
- meta: flush_handlers

- name: Enable kubelet
  service:
    name: kubelet
    enabled: yes
    state: started
  tags:
    - kubelet