DevOps Classroom notes 12/Mar/2025

Installing tomcat on ubuntu

• Remaining steps
  • correcting the extract
  • setting permissions
  • creating service file
  • restarting service

sudo chown -R tomcat: /opt/tomcat
sudo chmod +x /opt/tomcat/bin/*.sh

• To run raw linux commands we have modules like command, shell etc. These modules are not idempotent i.e. they run during every ansible execution
• Ansible handlers
• Ansible playbook is collection of tasks and handlers. Ansible Handler is also a module like task but it runs when some task calls it that to when changed.

---
- name: install tomcat on ubuntu server
  hosts: appservers
  become: yes
  tasks:
    - name: update packages and install java
      ansible.builtin.apt:
        name: "{{ java_package_name }}"
        update_cache: yes
        state: present
    - name: Ensure group tomcat exists
      ansible.builtin.group:
        name: "{{ tomcat_system_groupname }}"
        state: present
    - name: create tomcat user
      ansible.builtin.user:
        name: "{{ tomcat_system_username }}"
        system: yes
        create_home: yes
        group: "{{ tomcat_system_groupname }}"
        home: "{{ tomcat_homedir }}"
        shell: "{{ tomcat_shell }}"
    - name: download tomcat
      ansible.builtin.unarchive:
        src: "{{ tomcat_download_url }}"
        dest: "{{ tomcat_homedir }}"
        remote_src: yes
        owner: "{{ tomcat_system_username }}"
        group: "{{ tomcat_system_groupname }}"
        extra_opts:
          - --strip-components=1
      notify:
        - make scripts excutable
  handlers:
    - name: make scripts executable
      command: chmod +x /opt/tomcat/bin/*.sh

• The other version is get all the script using ansible module find

---
- name: install tomcat on ubuntu server
  hosts: appservers
  become: yes
  tasks:
    - name: update packages and install java
      ansible.builtin.apt:
        name: "{{ java_package_name }}"
        update_cache: yes
        state: present
    - name: Ensure group tomcat exists
      ansible.builtin.group:
        name: "{{ tomcat_system_groupname }}"
        state: present
    - name: create tomcat user
      ansible.builtin.user:
        name: "{{ tomcat_system_username }}"
        system: yes
        create_home: yes
        group: "{{ tomcat_system_groupname }}"
        home: "{{ tomcat_homedir }}"
        shell: "{{ tomcat_shell }}"
    - name: download tomcat
      ansible.builtin.unarchive:
        src: "{{ tomcat_download_url }}"
        dest: "{{ tomcat_homedir }}"
        remote_src: yes
        owner: "{{ tomcat_system_username }}"
        group: "{{ tomcat_system_groupname }}"
        extra_opts:
          - --strip-components=1
    - name: Find script files
      ansible.builtin.find:
        paths: /opt/tomcat/bin/
        patterns: '*.sh'
      register: script_files
    - name: print files
      ansible.builtin.debug:
        var: script_files