redis-shoot-out/tasks/shared.yml

---

- name: Create redis group
  group:
    name: redis
    state: present
    gid: 8000

- name: Create redis user
  user:
    name: redis
    group: redis
    uid: 8000
    shell: /usr/sbin/nologin
    state: present

- name: Soft file ulimit for redis user
  lineinfile:
    path: /etc/security/limits.conf
    regexp: '^redis\s+soft\s+nofile\s+65000'
    line: "redis  soft  nofile  65000"

- name: Hard file ulimit for redis user
  lineinfile:
    path: /etc/security/limits.conf
    regexp: '^redis\s+hard\s+nofile\s+65000'
    line: "redis  hard  nofile  65000"

# TODO: change this to check the value first
- name: Setup  RPS
  shell: "echo '1' > /sys/class/net/{{ ansible_default_ipv4.interface }}/queues/rx-0/rps_cpus"

# TODO: change this to check the value first
- name: Disable transparent hugepages
  shell: "echo 'never' > /sys/kernel/mm/transparent_hugepage/enabled"

- name: Ensure redis-tools are installed
  package:
    name: redis-tools
    state: present

- name: Sysctl Settings
  sysctl:
    name: "{{item.name}}"
    value: "{{item.value}}"
    reload: yes
  with_items:
    - { name: "vm.swappiness",                   value: "0"}
    - { name: "net.ipv4.tcp_sack",               value: "1"}
    - { name: "net.ipv4.tcp_timestamps",         value: "1"}
    - { name: "net.ipv4.tcp_window_scaling",     value: "1"}
    - { name: "net.ipv4.tcp_congestion_control", value: "cubic"}
    - { name: "net.ipv4.tcp_syncookies",         value: "1"}
    - { name: "net.ipv4.tcp_tw_recycle",         value: "1"}
    - { name: "net.ipv4.tcp_max_syn_backlog",    value: "1024"}
    - { name: "net.core.somaxconn",              value: "1024"}
    - { name: "net.core.rmem_max",               value: "425984"}
    - { name: "net.core.wmem_max",               value: "425984"}

- name: Set hostname
  hostname:
    name: "{{ inventory_hostname }}"

- name:  Set /etc/hosts
  lineinfile:
    path: /etc/hosts
    regexp: "{{inventory_hostname}}"
    line: "127.0.0.1 {{inventory_hostname}}"
    owner: root
    group: root
    mode: 0644