- name: Kubelet image garbage collection
  tags: kubelet_gc
  block:
    - name: Create the kubelet drop-in directory
      file:
        path: /etc/rancher/k3s/kubelet.conf.d
        state: directory
        mode: "0755"

    - name: Set the image garbage collection thresholds
      copy:
        dest: /etc/rancher/k3s/kubelet.conf.d/10-image-gc.conf
        mode: "0644"
        content: |
          apiVersion: kubelet.config.k8s.io/v1beta1
          kind: KubeletConfiguration
          imageGCHighThresholdPercent: 70
          imageGCLowThresholdPercent: 55
          imageMaximumGCAge: 168h

# KubeletConfiguration fields from kubernetes.kubelet_memory; the file is removed
# while the variable is empty.
- name: Kubelet memory reservation and eviction
  tags: kubelet_memory
  block:
    - name: Create the kubelet drop-in directory
      file:
        path: /etc/rancher/k3s/kubelet.conf.d
        state: directory
        mode: "0755"

    - name: Set the kubelet memory reservation and eviction thresholds
      copy:
        dest: /etc/rancher/k3s/kubelet.conf.d/20-memory.conf
        mode: "0644"
        content: "{{ {'apiVersion': 'kubelet.config.k8s.io/v1beta1', 'kind': 'KubeletConfiguration'} | combine(kubernetes.kubelet_memory) | to_nice_yaml(indent=2) }}"
      when: kubernetes.kubelet_memory | length > 0

    - name: Remove the kubelet memory drop-in
      file:
        path: /etc/rancher/k3s/kubelet.conf.d/20-memory.conf
        state: absent
      when: kubernetes.kubelet_memory | length == 0

# Every pod watching its config files takes inotify instances and watches from
# the per-user pool. An LXC container inherits these from its host. Only this
# file is loaded: sysctl --system would also apply distribution defaults such as
# rp_filter that differ from the live values Cilium relies on.
- name: Raise the inotify limits
  tags: inotify
  when: ansible_facts['virtualization_type'] != 'lxc'
  ansible.posix.sysctl:
    name: "{{ item.key }}"
    value: "{{ item.value }}"
    sysctl_file: /etc/sysctl.d/90-inotify.conf
  loop: "{{ {'fs.inotify.max_user_instances': 65536, 'fs.inotify.max_user_watches': 4194304} | dict2items }}"