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Ansible-part3: how to use modules - yum apt package

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packaging module: yum

yum is CentOS Linux package management tool.

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tasks:
    - name: upgrade all packages
      yum:
        name: '*'   # update all packages
        state: latest
    - name: install a package
      yum:
        name: git
        state: latest

output is:

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anna@ansible-controller:~/Desktop/ansible-code/inventory/modules/packaging_modules/inventory$ ansible-playbook site.yml 

PLAY [test packageing modules] **************************************************

TASK [upgrade all packages] *****************************************************
changed: [cube4200]

TASK [install a package] ********************************************************
changed: [cube4200]

PLAY RECAP **********************************************************************
cube4200                   : ok=2    changed=2    unreachable=0    failed=0    skipped=0    rescued=0    ignored=0   
[anna@cube4200 ~]$ which git
/usr/bin/git
[anna@cube4200 ~]$ git --version
git version 1.8.3.1

Notice: the update task took long time to update all packages.

packaging module: apt

apt is Ubuntu package management tool.

In this example, I am going to install git in two different linux, one use yum on CentOS, anther one use apt on Debian. So I need to add some condition to let ansible know which node should use yum or apt.
Before running site.yml I can use ansible web1 -m gather_facts |grep distribution to see the OS of nodes.

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tasks:
    - name: test yum module
      yum:
        name: git
        state: latest
      when: ansible_facts['distribution'] == "CentOS"    # this is from gather_facts
    - name: test apt module
      apt:
        name: git
        state: latest
      when: ansible_facts['distribution'] == "Debian"

During running, I can see ansible will judge which command (apt or yum) to use.

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anna@ansible-controller:~/Desktop/ansible-code/inventory/modules/packaging_modules/inventory$ ansible-playbook site.yml 

PLAY [test packageing modules] **************************************************

TASK [Gathering Facts] **********************************************************
ok: [ansible-node1]
ok: [cube4200]

TASK [test yum module] **********************************************************
skipping: [ansible-node1]
changed: [cube4200]

TASK [test apt module] **********************************************************
skipping: [cube4200]
ok: [ansible-node1]

PLAY RECAP **********************************************************************
ansible-node1              : ok=2    changed=0    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0   
cube4200                   : ok=2    changed=1    unreachable=0    failed=0    skipped=1    rescued=0    ignored=0

cube4200 uses CentOS, so when testing apt command, it is skipped; ansible_node1 uses Debian, which is skipped when testing yum.

packaging module: package

package module is more general and simplify the installing packages

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tasks:
    - name: test package module
      package:
        name: git
        state: latest

Notice: sometime package will have different name in different OS, under this situation, package module will not work, I still need to use yum or apt with gather_facts conditon to install packages.