ansible mysql percona task

main.yml

---
- name: Add Percona apt signing key
  sudo: yes
  apt_key: keyserver=keys.gnupg.net id=1C4CBDCDCD2EFD2A state=present

- name: Add Percona repository
  sudo: yes
  apt_repository: repo='deb http://repo.percona.com/apt trusty main' state=present

- name: Add Percona source repository
  sudo: yes
  apt_repository: repo='deb-src http://repo.percona.com/apt trusty main' state=present

- name: Update apt cache
  sudo: yes
  apt: update_cache=yes

- name: Install python packages
  sudo: yes
  apt: pkg={{ item }} state=present
  with_items:
    - vim
    - python-pycurl
    - python-mysqldb

- name: Install Percona packages
  sudo: yes
  apt: pkg={{ item }} state=present update_cache=yes
  with_items:
    - percona-server-common-5.6
    - percona-server-client-5.6
    - percona-server-server-5.6
  environment:
    DEBIAN_FRONTEND: noninteractive

- name: Create Mysql configuration file
  sudo: yes
  template: src=server.my.cnf.j2 dest=/etc/mysql/my.cnf
  notify:
  - restart mysql

- name: Update mysql root password for all root accounts
  sudo: yes
  mysql_user: name=root host={{ item }} password={{ mysql_root_password }}
  with_items:
    - "{{ ansible_hostname }}"
    - 127.0.0.1
    - ::1
    - localhost

- name: Copy .my.cnf file with root password credentials
  sudo: yes
  template: src=root.my.cnf.j2 dest=~/.my.cnf mode=0600

I was having problems getting the key from the gnupg.net server so changed the server to ubuntu's own keyserver which also hosts that key: keyserver.ubuntu.com

Hello,
Change to the new Percona ( https://www.percona.com/blog/2016/10/13/new-signing-key-for-percona-debian-and-ubuntu-packages/ ):

• name: Add Percona apt signing key
  sudo: yes
  apt_key: keyserver=keys.gnupg.net id=8507EFA5 state=present

And will work