centos - Check if service exists with Ansible

Centos - Check if service exists with Ansible

In Ansible, you can use the systemd Ansible module to check if a service exists on a CentOS system. Here's an example playbook that checks if a service exists:

--- - name: Check if service exists on CentOS hosts: your_target_host gather_facts: true become: yes tasks: - name: Check if the service exists systemd: name: your_service_name state: "list" register: service_status - name: Display the result debug: var: service_status - name: Perform tasks based on service existence # Your tasks based on the service existence status # For example, you can use `when` to conditionally execute tasks debug: msg: "The service exists!" when: "'ActiveState' in service_status and service_status['ActiveState'] == 'active'"

In this example:

  • Replace your_target_host with the appropriate host or group of hosts.
  • Replace your_service_name with the name of the service you want to check.

This playbook uses the systemd module with state: "list" to check if the service exists. The result is stored in the service_status variable, and you can use the information in subsequent tasks.

You may modify the playbook based on your specific requirements or add additional tasks to handle different scenarios based on the service existence status.

Examples

  1. "Ansible check if service exists on CentOS"

    • Code Implementation:
      - name: Check if service exists ansible.builtin.systemd: name: your_service_name register: service_status - debug: var: service_status
    • Description: This Ansible playbook checks if a service named your_service_name exists on CentOS using the systemd module. The result is stored in the service_status variable and then printed for verification.

  2. "Ansible conditional check service status CentOS"

    • Code Implementation:
      - name: Check if service exists ansible.builtin.systemd: name: your_service_name register: service_status - name: Perform tasks based on service status debug: msg: "Service exists" when: service_status.status == 'active'
    • Description: This Ansible playbook extends the previous example by performing tasks based on the service status. If the service is active, a debug message is printed, indicating that the service exists.

  3. "Ansible check if service is running CentOS"

    • Code Implementation:
      - name: Check if service is running ansible.builtin.service_facts: register: service_facts - name: Perform tasks based on service status debug: msg: "Service is running" when: "'your_service_name' in service_facts.services and service_facts.services['your_service_name'].state == 'running'"
    • Description: This Ansible playbook uses the service_facts module to gather information about all services. It then checks if the specified service (your_service_name) is present and running, printing a message if true.

  4. "Ansible task check if service exists and install CentOS"

    • Code Implementation:
      - name: Check if service exists ansible.builtin.systemd: name: your_service_name register: service_status - name: Install service if not exists ansible.builtin.yum: name: your_service_name state: present when: service_status.status != 'active'
    • Description: This Ansible playbook first checks if the service exists using the systemd module. If the service is not active, it uses the yum module to install the service on CentOS.

  5. "Ansible playbook check if service enabled CentOS"

    • Code Implementation:
      - name: Check if service is enabled ansible.builtin.systemd: name: your_service_name enabled: yes register: service_status - debug: var: service_status
    • Description: This Ansible playbook checks if a service (your_service_name) is enabled using the systemd module with the enabled: yes option. The result is stored in the service_status variable and then printed for verification.

  6. "Ansible conditional restart service if exists CentOS"

    • Code Implementation:
      - name: Check if service exists ansible.builtin.systemd: name: your_service_name register: service_status - name: Restart service if exists ansible.builtin.service: name: your_service_name state: restarted when: service_status.status == 'active'
    • Description: This Ansible playbook checks if the service exists using the systemd module. If the service is active, it restarts the service using the service module.

  7. "Ansible playbook check if service is masked CentOS"

    • Code Implementation:
      - name: Check if service is masked ansible.builtin.systemd: name: your_service_name masked: yes register: service_status - debug: var: service_status
    • Description: This Ansible playbook checks if a service (your_service_name) is masked (disabled) using the systemd module with the masked: yes option. The result is stored in the service_status variable and then printed for verification.

  8. "Ansible playbook check if service not running CentOS"

    • Code Implementation:
      - name: Check if service is not running ansible.builtin.service_facts: register: service_facts - name: Perform tasks if service is not running debug: msg: "Service is not running" when: "'your_service_name' not in service_facts.services or service_facts.services['your_service_name'].state != 'running'"
    • Description: This Ansible playbook uses the service_facts module to gather information about all services. It then checks if the specified service (your_service_name) is not present or not running, printing a message if true.

  9. "Ansible playbook check if service exists and start CentOS"

    • Code Implementation:
      - name: Check if service exists ansible.builtin.systemd: name: your_service_name register: service_status - name: Start service if exists ansible.builtin.service: name: your_service_name state: started when: service_status.status == 'active'
    • Description: This Ansible playbook first checks if the service exists using the systemd module. If the service is active, it starts the service using the service module.

  10. "Ansible conditional check service presence and version CentOS"

    • Code Implementation:
      - name: Check if service is present and get version ansible.builtin.package_facts: manager: auto register: package_facts - debug: msg: "Service version is {{ package_facts.packages['your_service_name'].version }}" when: "'your_service_name' in package_facts.packages"
    • Description: This Ansible playbook uses the package_facts module to gather information about installed packages, including the version of the specified service (your_service_name). It prints the service version if the service is present.

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