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  • 1. OS Tabanlı Koşullar (Facts Kullanımı)
  • 2. Değişken (Variable) Tabanlı Koşullar
  • 3. Görevleri Yeniden Kullanırken (Re-Use) Koşullar

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  1. Ansible

Ansible Conditionals based on facts, variables, re-use

1. OS Tabanlı Koşullar (Facts Kullanımı)

Diyelim ki filonuzda Ubuntu 18.04, CentOS 7, ve Windows Server 2019 var. Bazı görevleri sadece belirli işletim sistemlerinde çalıştırmak isteyebilirsiniz. İşte burada Ansible Facts devreye girer.

  1. Ansible Facts nedir?

    • Ansible, her hedef makineye bağlanıp sistem bilgilerini toplar (OS türü, sürüm, vs.). Bu bilgilere ansible_facts[...] üzerinden ulaşabilirsiniz.

    • Örnek: ansible_facts['os_family'], ansible_facts['distribution_major_version'].

  2. Örnek Senaryo:

    • Ubuntu 18.04 üzerinde belirli bir Nginx sürümünü kuracaksınız.

    • Koşul ifadesi (when) şu şekilde olabilir:

      - name: Install Nginx on Ubuntu 18.04
        apt:
          name: nginx=1.18.0
          state: present
        when: ansible_facts['os_family'] == 'Debian'
              and ansible_facts['distribution_major_version'] == '18'
    • Böylece yalnızca Ubuntu 18.04 olan makinelerde bu görev çalışır; CentOS veya Windows’ta atlanır (skipped).

Neden Faydalı?

  • Aynı playbook içinde Debian ve RedHat gibi farklı OS’lere özel görevleri ayırabilir, tek bir dosya ile tüm makineleri yönetebilirsiniz.

2. Değişken (Variable) Tabanlı Koşullar

Sıklıkla, ortamlara (development, staging, production) göre farklı yapılandırmalar gerekebilir. Bunu bir değişken (örn. app_env) kullanarak kolayca yönetebilirsiniz.

  1. Örnek:

    - name: Deploy config based on environment
      template:
        src: "{{ app_env }}_config.j2"
        dest: "/etc/myapp/config.conf"
    • app_env değişkenine production veya staging atarsanız, sırasıyla production_config.j2 veya staging_config.j2 dosyasını uygular.

  2. Koşul Eklemek:

    • Örneğin, “Production dışında konfig dosyasını yükleme” gibi bir ifadeniz varsa:

      when: app_env == 'production'
    • Değişkeni envanterde (inventory), group_vars, host_vars veya playbook içinde vars: tanımlayabilirsiniz.

Neden Faydalı?

  • Farklı ortamlara (dev, staging, prod) göre tek bir playbook kullanabilir, sadece değişkeni değiştirerek farklı yapılandırmaları otomatik uygulayabilirsiniz.

3. Görevleri Yeniden Kullanırken (Re-Use) Koşullar

Bazen tüm sunucularda çalışacak ortak görevleriniz olur (örn. paket kurma, dizin oluşturma), ancak bazı eylemleri sadece belirli bir ortama (production) veya belirli bir OS’ye yönelik yapmak istersiniz.

Örnek:

- name: Common tasks for all servers
  hosts: all
  tasks:
    - name: Install required packages
      apt:
        name: [ 'package1', 'package2' ]
        state: present

    - name: Create necessary directories
      file:
        path: /path/to/directory
        state: directory

    - name: Start web application (only on production)
      service:
        name: myapp
        state: started
      when: environment == 'production'
  1. İlk iki görev her sunucuda çalışır (paket kurma, dizin oluşturma).

  2. Son görev sadece “environment” değişkeni “production” olan makinelerde çalışır.

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Last updated 8 days ago

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