Initial CV-aligned infrastructure portfolio

Rework portfolio around Linux operations, Zabbix monitoring, migration validation, and ELK/Grafana log observability.

Add AAP-style LVM resize workflow, Zabbix server/proxy/agent automation assets, Linux/AIX monitoring templates, and updated validation CI.

professional-infra/linux-operations-automation/roles/decommission/tasks/main.yml

@@ -0,0 +1,177 @@
+---
+- name: Validate decommissioning requirements
+  ansible.builtin.assert:
+    that:
+      - backup_data or not backup_data
+    fail_msg: "Invalid decommissioning configuration"
+
+- name: Pre-decommissioning checks
+  block:
+    - name: Check node health
+      ansible.builtin.uri:
+        url: http://localhost/health
+        method: GET
+        status_code: 200
+      register: health_check
+      failed_when: false
+      ignore_errors: true
+      when: "'webservers' in group_names"
+
+    - name: Create decommissioning backup directory
+      ansible.builtin.file:
+        path: "/var/backups/decommission-{{ ansible_date_time.iso8601 }}"
+        state: directory
+        mode: '0755'
+
+    - name: Initialize decommissioning log
+      ansible.builtin.file:
+        path: "/var/log/decommission.log"
+        state: touch
+        mode: '0644'
+        modification_time: now
+        access_time: now
+
+    - name: Log decommissioning start
+      ansible.builtin.lineinfile:
+        path: "/var/log/decommission.log"
+        line: "{{ ansible_date_time.iso8601 }} - Starting decommissioning of {{ inventory_hostname }}"
+        state: present
+
+- name: Graceful application shutdown
+  block:
+    - name: Stop application services
+      ansible.builtin.service:
+        name: "{{ item }}"
+        state: stopped
+      loop: "{{ application_services }}"
+      failed_when: false
+      when: graceful_shutdown
+
+    - name: Wait for connections to drain
+      ansible.builtin.pause:
+        seconds: 30
+      when: graceful_shutdown and ("webservers" in group_names or "loadbalancers" in group_names)
+
+- name: Export and backup data
+  block:
+    - name: Create config export directory
+      ansible.builtin.file:
+        path: "/var/backups/decommission-{{ ansible_date_time.iso8601 }}/config"
+        state: directory
+        mode: '0755'
+
+    - name: Archive system configuration
+      community.general.archive:
+        path: "{{ config_paths }}"
+        dest: "/var/backups/decommission-{{ ansible_date_time.iso8601 }}/config/system_config.tar.gz"
+        format: gz
+      when: export_config
+      failed_when: false  # noqa risky-file-permissions
+
+    - name: Create data backup directory
+      ansible.builtin.file:
+        path: "/var/backups/decommission-{{ ansible_date_time.iso8601 }}/data"
+        state: directory
+        mode: '0755'
+      when: backup_data
+
+    - name: Backup individual data paths
+      community.general.archive:
+        path: "{{ item }}"
+        dest: "/var/backups/decommission-{{ ansible_date_time.iso8601 }}/data/{{ item | regex_replace('/', '_') }}.tar.gz"
+        format: gz
+      loop: "{{ data_paths }}"
+      when: backup_data
+      failed_when: false  # noqa risky-file-permissions
+
+- name: Update monitoring and load balancing
+  block:
+    - name: Remove from load balancer
+      ansible.builtin.debug:
+        msg: "Would remove {{ inventory_hostname }} from load balancer"
+      when: "'webservers' in group_names or 'databases' in group_names"
+
+    - name: Update monitoring alerts
+      ansible.builtin.debug:
+        msg: "Would update monitoring alerts for {{ inventory_hostname }}"
+      when: "'monitoring' not in group_names"
+
+- name: Clean up application
+  block:
+    - name: Remove application directories
+      ansible.builtin.file:
+        path: "{{ item }}"
+        state: absent
+      loop:
+        - /opt/application
+        - /var/www/html
+        - /var/lib/postgresql
+        - /var/lib/prometheus
+      failed_when: false
+
+    - name: Remove application packages
+      ansible.builtin.apt:
+        name: "{{ item }}"
+        state: absent
+        purge: true
+      loop: "{{ application_packages }}"
+      failed_when: false
+
+    - name: Clean system logs
+      ansible.builtin.shell: |
+        set -o pipefail
+        find /var/log -name "*.log" -type f -size +0 -exec truncate -s 0 {} \;
+      changed_when: false
+      failed_when: false
+
+    - name: Remove SSH credentials
+      ansible.builtin.file:
+        path: "{{ item }}"
+        state: absent
+      loop:
+        - /root/.ssh/authorized_keys
+        - /root/.ssh/known_hosts
+        - /home/infra-admin/.ssh/authorized_keys
+      failed_when: false
+
+- name: Generate decommissioning report
+  ansible.builtin.template:
+    src: decommission_report.j2
+    dest: "/var/log/decommission_report_{{ ansible_date_time.iso8601 }}.log"
+    mode: '0644'
+  vars:
+    backup_location: "/var/backups/decommission-{{ ansible_date_time.iso8601 }}"
+
+- name: Send decommissioning notification
+  community.general.mail:
+    host: localhost
+    port: 25
+    to: "{{ decommission_notification_email }}"
+    subject: "Node Decommissioned - {{ inventory_hostname }}"
+    body: |
+      Node {{ inventory_hostname }} has been successfully decommissioned.
+
+      Backup location: /var/backups/decommission-{{ ansible_date_time.iso8601 }}/
+      Services stopped: {{ application_services | join(', ') }}
+      Configuration exported: {{ export_config }}
+      Data backed up: {{ backup_data }}
+
+      See /var/log/decommission_report_{{ ansible_date_time.iso8601 }}.log for details
+  when: decommission_notification_email is defined
+  failed_when: false
+
+- name: Finalize decommissioning
+  block:
+    - name: Log decommissioning completion
+      ansible.builtin.lineinfile:
+        path: "/var/log/decommission.log"
+        line: "{{ ansible_date_time.iso8601 }} - Decommissioning completed for {{ inventory_hostname }}"
+        state: present
+
+    - name: Perform system shutdown
+      ansible.builtin.reboot:
+        msg: "System scheduled for shutdown after decommissioning"
+        delay: "{{ shutdown_delay }}"
+      when: auto_shutdown | bool
+      async: 1
+      poll: 0