# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

---
- name: Load necessary modules
  modprobe:
    name: "{{ item }}"
    state: present
  with_items:
    - overlay
    - br_netfilter

- name: Configure sysctl
  sysctl:
    name: "{{ item }}"
    value: "1"
    state: present
  loop:
    - net.ipv6.conf.default.disable_ipv6
    - net.ipv6.conf.all.disable_ipv6
    - net.ipv6.conf.lo.disable_ipv6
    - net.bridge.bridge-nf-call-iptables
    - net.bridge.bridge-nf-call-ip6tables
    - net.ipv4.ip_forward
  ignore_errors: true

# This is necessary when we run dnsmasq.
# Otherwise, we get the error:
# failed to create inotify: Too many open files
- name: Configure number of inotify instances
  sysctl:
    name: "fs.inotify.max_user_instances"
    value: "256"
    state: present
  ignore_errors: true

- name: Configure number of inotify instances
  sysctl:
    name: "{{ item }}"
    value: "0"
    state: present
  loop:
    - net.ipv4.conf.all.rp_filter
    - net.ipv4.conf.default.rp_filter
  ignore_errors: true

- name: Remove swapfile from /etc/fstab
  mount:
    name: "{{ item }}"
    fstype: swap
    state: absent
  with_items:
    - swap
    - none

- name: Disable swap
  command: swapoff -a
  when: ansible_swaptotal_mb > 0

- name: Install Kubernetes binaries
  apt:
    state: present
    update_cache: true
    allow_downgrade: true
    pkg:
      - "kubelet={{ kube_version }}"
      - "kubeadm={{ kube_version }}"
      - "kubectl={{ kube_version }}"

- name: Restart kubelet
  service:
    name: kubelet
    daemon_reload: yes
    state: restarted

- name: Configure resolv.conf
  template:
    src: files/resolv.conf
    dest: /etc/resolv.conf
    owner: root
    group: root
    mode: 0644
  vars:
    nameserver_ip: "8.8.8.8"

- name: Disable systemd-resolved
  service:
    name: systemd-resolved
    enabled: false
    state: stopped
  ignore_errors: true

- name: Disable unbound
  service:
    name: unbound
    enabled: false
    state: stopped
  ignore_errors: true
...