Ansible playbook for introducing latency

tc_playbook.yml

---
- name: Simulating latency
  hosts: all
  vars:
    latency_ms: 50
    packet_loss_percent: 1 
    network_interface: eth0
    remove_qdisc: false
  tasks: 
    - name: Install tc
      yum:
        name: tc
        state: present
      become: true

    - name: Introducing latency to {{target_subnet}}
      shell: '{{item}}'
      #debug:
      #  msg: '{{item}}'
      with_items:
      - "/usr/sbin/tc qdisc add dev {{network_interface}} root handle 1: prio > /dev/null"
      - "/usr/sbin/tc qdisc add dev {{network_interface}} parent 1:1 handle 10: sfq > /dev/null"
      - "/usr/sbin/tc qdisc add dev {{network_interface}} parent 1:2 handle 20: sfq > /dev/null"
      - "/usr/sbin/tc qdisc add dev {{network_interface}} parent 1:3 handle 30: netem delay {{latency_ms}}ms 5ms 20.00 > /dev/null"
      become: true
      when: not remove_qdisc 

    - name: 
      shell: "/usr/sbin/tc filter add dev {{network_interface}} protocol ip parent 1:0 prio 1 u32 match ip dst {{item}} flowid 1:3 > /dev/null"
      with_items: "{{subnets}}"
      become: true
      when: not remove_qdisc 


    - name: Remove all latency and packet loss
      shell: 'sudo tc qdisc del dev {{network_interface}} root'
      when: remove_qdisc

Usage example:

ansible-playbook tc_playbook.yml -i mr_inventory.yml -l broker-group-1 --extra-vars "subnets=['10.237.102.96/27','10.237.102.128/27']"