Ansible - Is it possible to skip the execution of a role?

Question

Here is my main playbook, which launch the roles listed below

---
 - hosts: slaves
   roles:
      - ntp
      - nmap
      - tcpdump
      - unattended-upgrades
      - traceroute
      - apache
      - mysql

I would like to let the user decide if he wants to install apache and mysql, by typing yes or no at the proposition which will pops-up during the execution of the playbook. I've tried differents things like vars_prompt, except and when but without success. is there anyway to reach my objective? Thanks !

score 2 · Answer 1 · answered Mar 05 '19 at 19:55

Indeed ad hoc user interaction is not what ansible is about. But You can simply hash some lines from your playbook prior to running it:

---
 - hosts: slaves
   roles:
      - ntp
      - nmap
      - tcpdump
      - unattended-upgrades
      - traceroute
# leave these today:
#     - apache
#     - mysql

score 1 · Answer 2 · answered Mar 06 '19 at 10:02

I've finally found something that works This is the playbook inclued in the role folder 'apache', which install this service

---
    - name: Installation apache sur Centos et RedHat
      yum:
        name: httpd
        state: present
      when: (ansible_distribution == 'CentOS' or ansible_distribution == 'RedHat') and reponse_apache == 'oui'

I declared a variable `reponse_apache'. If the user says 'oui', the install begins

My main playbook:

---
 - hosts: slaves
   roles:
#      - ntp
#      - nmap
#      - tcpdump
#      - unattended-upgrades
#      - traceroute
      - apache
#      - mysql


   vars_prompt:
     - name: "reponse_apache"
       prompt: "Voulez vous installer apache ? Une exception pare-feu pour le service http sera créée sur les systèmes CentOS 7 (oui/non) "
       private: no

     - name: "reponse_mysql"
       prompt: "Voulez vous installer mysql ? (oui/non) "
       private: no

I created a section vars_prompt which contains the variable reponse_apache. I've done the same for mysql with the variable reponse_mysql

---
   - name: Installation python sur les systèmes Debian et Ubuntu
     apt:
       name: python3
       state: present
     when: (ansible_distribution == 'Debian' or ansible_distribution) == 'Ubuntu' and reponse_mysql == 'oui'

   - name: Installation wget sur les systèmes CentOS et RedHat
     yum:
       name: wget
       state: present
     when: (ansible_distribution == 'CentOS' or ansible_distribution) == 'RedHat' and reponse_mysql == 'oui'

   - file:
      path: /etc/repo_mysql
      state: directory
     when: reponse_mysql == 'oui'

   - name: Téléchargement dépôt mysql sur les systèmes CentOS et RedHat
     get_url:
       url: http://repo.mysql.com/mysql-community-release-el7-5.noarch.rpm
       dest: /etc/repo_mysql/mysql-community-release-el7-5.noarch.rpm
     when: (ansible_distribution == 'CentOS' or ansible_distribution == 'RedHat') and reponse_mysql == 'oui'

   - name: Installation dépôt mysql sur les systèmes CentOS et RedHat
     yum:
       name: /etc/repo_mysql/mysql-community-release-el7-5.noarch.rpm
       state: present
     when: (ansible_distribution == 'CentOS' or ansible_distribution == 'RedHat') and reponse_mysql == 'oui'

   - name: Installation mysql sur tous les systèmes
     yum:
       name: mysql-server
       state: present
     when: reponse_mysql == 'oui'

   - name: Creation BDD "vierge" sur tous les systèmes
     mysql_db:
       name: vierge
       state: present
     when: reponse_mysql == 'oui'

   - name: Demarrage mysql sur les systèmes Debian et Ubuntu
     service:
       name: mysql
       state: started
     when: (ansible_distribution == 'Debian' or ansible_distribution == 'Ubuntu') and reponse_mysql == 'oui'

   - name: Demarrage mysql sur les systèmes CentOS et RedHat
     service:
       name: mysqld
       state: started

score 1 · Answer 3 · answered Mar 07 '19 at 23:05

If you are can use include_role instead of roles then you could run a play like this.

Just provide a space separated list at the prompt.

---
- hosts: localhost
  gather_facts: no
  vars_prompt:
  - name: run_roles
    prompt: Which roles do you want to run
  tasks:
  - include_role:
      name: "{{ role.role }}"
    loop_control:
      loop_var: role
    when: role.role in run_roles
    loop:
    - role: ntp
    - role: nmap
    - role: tcpdump
    - role: unattended-upgrades
    - role: traceroute
    - role: apache
    - role: mysql

Ansible - Is it possible to skip the execution of a role?

3 Answers3