Example of converting logback.xml from Cassandra configuration into a jinja template using Ansible

create_jinja2_template_for_logback_xml.yml

---
- name: Copy logback.xml file to templates directory to make Jinja2 template
  copy:
    src: "{{ cassandra_role_dir }}/files/apache-cassandra-{{ cassandra_version }}/conf/logback.xml"
    dest: "{{ cassandra_role_dir }}/templates/apache-cassandra-{{ cassandra_version }}/conf/logback.xml.j2"

- name: Make Jinga2 template for logback.xml 
  lineinfile:
    dest: "{{ cassandra_role_dir }}/templates/apache-cassandra-{{ cassandra_version }}/conf/logback.xml.j2"
    regexp: "{{ item.regexp }}"
    line: "{{ item.line }}" 
  with_items:
      - [ { regexp: '<file>\${cassandra.logdir}/system.log</file>', 
            line: '    <file>__OPEN_BRACES__ path_to_cassandra_system_log __CLOSE_BRACES__</file>' },
          { regexp: '<fileNamePattern>\${cassandra.logdir}/system.log.%i.zip</fileNamePattern>', 
            line: '      <fileNamePattern>__OPEN_BRACES__ path_to_cassandra_system_log __CLOSE_BRACES__.%i.zip</fileNamePattern>' },
          { regexp: "<maxIndex>20</maxIndex>", 
            line: '      <maxIndex>__OPEN_BRACES__ max_index __CLOSE_BRACES__</maxIndex>' },
        ]

- include: fix_braces_in_template_file.yml template_file="{{ cassandra_role_dir }}/templates/apache-cassandra-{{ cassandra_version }}/conf/logback.xml.j2"