Getting Started with Ansible 09 - Targeting Specific Nodes

Overview

Ansible is an incredible configuration management and provisioning utility that enables you to automate all the things. In this series, you'll learn everything you need to know in order to use Ansible for your day-to-day administration duties. In video #9, we split our inventory file into groups, and look at how to run tasks on nodes based on their group.

Relevant Links
Original Video

install_apache.yml

 ---
 
 - hosts: all
   become: true
   tasks:
 
   - name: install apache and php for Ubuntu servers
     apt:
       name:
         - apache2
         - libapache2-mod-php
       state: latest
       update_cache: yes
     when: ansible_distribution == "Ubuntu"
 
   - name: install apache and php for CentOS servers
     dnf:
       name:
         - httpd
         - php
       state: latest
       update_cache: yes
     when: ansible_distribution == "CentOS"

inventory (updated with groups)

 [web_servers]
 172.16.250.132
 172.16.250.248
 
 [db_servers]
 172.16.250.133
 
 [file_servers]
 172.16.250.134

site.yml

 ---
 
 - hosts: all
   become: true
   tasks:
 
   - name: install updates (CentOS)
     dnf:
       update_only: yes
       update_cache: yes
     when: ansible_distribution == "CentOS"
 
   - name: install updates (Ubuntu)
     apt:
       upgrade: dist
       update_cache: yes
     when: ansible_distribution == "Ubuntu"
 
 
 - hosts: web_servers
   become: true
   tasks:
 
   - name: install apache and php for Ubuntu servers
     apt:
       name:
         - apache2
         - libapache2-mod-php
       state: latest
     when: ansible_distribution == "Ubuntu"
 
   - name: install apache and php for CentOS servers
     dnf:
       name:
         - httpd
         - php
       state: latest
     when: ansible_distribution == "CentOS"

site.yml (second version)

 ---
 
 - hosts: all
   become: true
   pre_tasks:
 
   - name: install updates (CentOS)
     dnf:
       update_only: yes
       update_cache: yes
     when: ansible_distribution == "CentOS"
 
   - name: install updates (Ubuntu)
     apt:
       upgrade: dist
       update_cache: yes
     when: ansible_distribution == "Ubuntu"
 
 
 - hosts: web_servers
   become: true
   tasks:
 
   - name: install apache2 package
     apt:
       name:
         - apache2
         - libapache2-mod-php
       state: latest
     when: ansible_distribution == "Ubuntu"
 
   - name: install httpd package
     dnf:
       name:
         - httpd
         - php
       state: latest
     when: ansible_distribution == "CentOS"

site.yml (third version)

 ---
 
 - hosts: all
   become: true
   pre_tasks:
 
   - name: install updates (CentOS)
     dnf:
       update_only: yes
       update_cache: yes
     when: ansible_distribution == "CentOS"
 
   - name: install updates (Ubuntu)
     apt:
       upgrade: dist
       update_cache: yes
    when: ansible_distribution == "Ubuntu"
 
 
 - hosts: web_servers
   become: true
   tasks:
 
   - name: install httpd package (CentOS)
     dnf:
       name:
         - httpd
         - php
       state: latest
     when: ansible_distribution == "CentOS"
 
   - name: install apache2 package (Ubuntu)
     apt:
       name:
         - apache2
         - libapache2-mod-php
       state: latest
     when: ansible_distribution == "Ubuntu"
 
 - hosts: db_servers
   become: true
   tasks:
 
   - name: install httpd package (CentOS)
     dnf:
       name: mariadb
       state: latest
     when: ansible_distribution == "CentOS"
 
   - name: install mariadb server
     apt:
       name: mariadb-server
       state: latest
     when: ansible_distribution == "Ubuntu"

site.yml (fourth version)

 ---
 
 - hosts: all
   become: true
   pre_tasks:
 
   - name: install updates (CentOS)
     dnf:
       update_only: yes
       update_cache: yes
     when: ansible_distribution == "CentOS"
 
   - name: install updates (Ubuntu)
     apt:
       upgrade: dist
       update_cache: yes
     when: ansible_distribution == "Ubuntu"
 
 
 - hosts: web_servers
   become: true
   tasks:
 
   - name: install httpd package (CentOS)
     dnf:
       name:
         - httpd
         - php
       state: latest
     when: ansible_distribution == "CentOS"
 
   - name: install apache2 package (Ubuntu)
     apt:
       name:
         - apache2
         - libapache2-mod-php
       state: latest
     when: ansible_distribution == "Ubuntu"
 
 - hosts: db_servers
   become: true
   tasks:
 
   - name: install mariadb server package (CentOS)
     dnf:
       name: mariadb
       state: latest
     when: ansible_distribution == "CentOS"
 
   - name: install mariadb server
     apt:
       name: mariadb-server
       state: latest
     when: ansible_distribution == "Ubuntu"
 
 - hosts: file_servers
   become: true
   tasks:
 
   - name: install samba package
     package:
       name: samba
       state: latest