multisetup-latency.yml

---
- name: latency setup
  hosts: all
  remote_user: root
  tags:
    - latency
  tasks:

    - name: Check that network latency is specified
      assert:
        that:
          - latency is defined
          - latency | int | string == latency
        fail_msg: "you need to define latency variable as one way connection delay in seconds"

    - debug:
        var: latency

    - debug:
        var: latency_spec

    - name: Transform latency_spec for the network-latency.sh script
      set_fact:
        latency_spec_opts: "-l {{ latency_spec.items() | map('join', '=') | join(' -l ') }}"
      when: latency_spec is defined

    - name: Set empty latency_spec for the network-latency.sh script
      set_fact:
        latency_spec_opts: ""
      when: latency_spec is not defined

    - debug:
        var: latency_spec_opts

    - name: Install tc dependencies for latency setup
      dnf:
        name:
          - iproute-tc
          - kernel-modules-extra
        state: present

    - name: Install yum utils for needs-restarting plugin
      dnf:
        name: yum-utils
        state: present

    - name: Check if a reboot is needed
      ansible.builtin.command: needs-restarting -r
      register: needs_restarting
      changed_when: needs_restarting.rc != 0
      ignore_errors: yes
      failed_when: false

    - name: Reboot after update if needed
      when: needs_restarting.changed
      block:

        - name: Reboot node
          shell: sleep 5 && reboot
          async: 1
          poll: 0

        - name: Wait for the reboot to complete
          wait_for_connection:
            connect_timeout: 10
            sleep: 10
            delay: 30
            timeout: 7200

        - ping:
          any_errors_fatal: True

    - name: Add sch_netem into modules-load.d
      ansible.builtin.copy:
        dest: "/etc/modules-load.d/sch_netem.conf"
        content: "sch_netem"
        owner: root
        group: root

    - name: Modprobe sch_netem module
      community.general.modprobe:
        name: sch_netem
        state: present

    - name: Copy latency script
      copy:
        src: "ocpnetsplit/network-latency.sh"
        dest: "/etc/network-latency.sh"
        owner: root
        group: root
        mode: 0544

    - name: Copy pingtest script for debugging latency on nodes
      copy:
        src: "ocpnetsplit/network-pingtest.sh"
        dest: "/etc/network-pingtest.sh"
        owner: root
        group: root
        mode: 0544

    - name: Copy latency unit file
      ansible.builtin.template:
        src: "ocpnetsplit/systemd/network-latency.service"
        dest: "/etc/systemd/system/network-latency.service"
        owner: root
        group: root
      register: latency_unit_file

    - name: Daemon reload
      ansible.builtin.systemd:
        daemon_reload: true
      when: latency_unit_file.changed

    - name: Restart and enable the latency service
      ansible.builtin.systemd:
        name: network-latency
        enabled: true
        state: restarted