Adding LVM configuration management

ansible/roles/host_setup/tasks/lvm_config.yml

@@ -0,0 +1,41 @@
+---
+# Copyright 2025, Rackspace Technology, Inc.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#     http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+- name: Discover current pv devices
+  ansible.builtin.shell: |
+    set -o pipefail
+    /sbin/pvdisplay | awk '/PV\ Name/ {print $3}' | sed 's/\/dev\///g'
+  args:
+    executable: /bin/bash
+  register: lvm_devices
+  changed_when: lvm_devices.rc != 0
+  failed_when: false
+
+- name: Ensure "/etc/lvm" directory
+  ansible.builtin.file:
+    state: "directory"
+    path: "/etc/lvm"
+    mode: "0755"
+  when: lvm_devices.rc == 0
+
+- name: Update lvm.conf
+  ansible.builtin.template:
+    src: "lvm.conf.j2"
+    dest: "/etc/lvm/lvm.conf"
+    owner: "root"
+    group: "root"
+    backup: "yes"
+    mode: "0644"
+  when: lvm_devices.rc == 0

ansible/roles/host_setup/tasks/main.yml

@@ -165,5 +165,8 @@
 - name: Configure custom multipath.conf
   ansible.builtin.include_tasks: custom_multipath.yml
 
+- name: Configure custom lvm.conf
+  ansible.builtin.include_tasks: lvm_config.yml
+
 - name: Install RAID controller CLI tools
   ansible.builtin.include_tasks: raid_cli_tools.yml

ansible/roles/host_setup/templates/lvm.conf.j2

@@ -0,0 +1,127 @@
+# {{ ansible_managed }}
+
+{% set used_lvm_devices = [] %}
+{% if host_lvm_devices_filter_override|length > 0 %}
+    {% set used_lvm_devices = host_lvm_devices_filter_override %}
+{% else %}
+    {% set lv_devices = lvm_devices.stdout.split('\n') %}
+    {% if lv_devices|length > 0 %}
+        {% for net in lv_devices %}
+            {% if net != '' %}
+                {% set lv_device = '"a/' + net + '/"' %}
+                {% if used_lvm_devices.append(lv_device) %}{% endif %}
+            {% endif %}
+        {% endfor %}
+    {% endif %}
+
+# Ansible Discovered LVM Devices {{ lv_devices }}
+{% endif %}
+
+{% if used_lvm_devices|length <= 0 %}
+    {# If there are no LVM devices present, allow all devices to be scanned #}
+    {% if used_lvm_devices.append('"a/.*/"') %}{% endif %}
+{% else %}
+    {# Append 'loop.*' to the list to help with AIO deployments. #}
+    {% if used_lvm_devices.append('"a/loop.*/"') %}{% endif %}
+    {# Disable scanning any other devices than the ones listed. #}
+    {% if used_lvm_devices.append('"r/.*/"') %}{% endif %}
+{% endif %}
+
+devices {
+    dir = "/dev"
+    scan = [ "/dev" ]
+    obtain_device_list_from_udev = 1
+    preferred_names = [ ]
+    filter = [ {{ used_lvm_devices|join(', ') }} ]
+    cache_dir = "/run/lvm"
+    cache_file_prefix = ""
+    write_cache_state = 1
+    sysfs_scan = 1
+    multipath_component_detection = 1
+    md_component_detection = 1
+    md_chunk_alignment = 1
+    data_alignment_detection = 1
+    data_alignment = 0
+    data_alignment_offset_detection = 1
+    ignore_suspended_devices = 0
+    disable_after_error_count = 0
+    require_restorefile_with_uuid = 1
+    pv_min_size = 2048
+    issue_discards = 1
+}
+allocation {
+    maximise_cling = 1
+    mirror_logs_require_separate_pvs = 0
+    thin_pool_metadata_require_separate_pvs = 0
+}
+log {
+    verbose = 0
+    silent = 0
+    syslog = 1
+    overwrite = 0
+    level = 0
+    indent = 1
+    command_names = 0
+    prefix = "  "
+}
+backup {
+    backup = 1
+    backup_dir = "/etc/lvm/backup"
+    archive = 1
+    archive_dir = "/etc/lvm/archive"
+    retain_min = 10
+    retain_days = 30
+}
+shell {
+    history_size = 100
+}
+global {
+    umask = 077
+    test = 0
+    units = "h"
+    si_unit_consistency = 1
+    activation = 1
+    proc = "/proc"
+    locking_type = 1
+    wait_for_locks = 1
+    fallback_to_clustered_locking = 1
+    fallback_to_local_locking = 1
+    locking_dir = "/run/lock/lvm"
+    prioritise_write_locks = 1
+    abort_on_internal_errors = 0
+    detect_internal_vg_cache_corruption = 0
+    metadata_read_only = 0
+    mirror_segtype_default = "mirror"
+    use_lvmetad = 0
+    thin_check_executable = "/usr/sbin/thin_check"
+    thin_check_options = [ "-q" ]
+}
+activation {
+    checks = 0
+    udev_sync = 1
+    udev_rules = 1
+    verify_udev_operations = 0
+    retry_deactivation = 1
+    missing_stripe_filler = "error"
+    use_linear_target = 1
+    reserved_stack = 64
+    reserved_memory = 8192
+    process_priority = -18
+    mirror_region_size = 512
+    readahead = "auto"
+    raid_fault_policy = "warn"
+    mirror_log_fault_policy = "allocate"
+    mirror_image_fault_policy = "remove"
+    snapshot_autoextend_threshold = 100
+    snapshot_autoextend_percent = 20
+    thin_pool_autoextend_threshold = 100
+    thin_pool_autoextend_percent = 20
+    use_mlockall = 0
+    monitoring = 0
+    polling_interval = 15
+}
+dmeventd {
+    mirror_library = "libdevmapper-event-lvm2mirror.so"
+    snapshot_library = "libdevmapper-event-lvm2snapshot.so"
+    thin_library = "libdevmapper-event-lvm2thin.so"
+}

ansible/roles/host_setup/vars/debian.yml

@@ -66,3 +66,5 @@ _host_distro_packages:
 _hosts_package_list:
   - name: ca-certificates
     state: latest
+
+host_lvm_devices_filter_override: []

ansible/roles/host_setup/vars/ubuntu.yml

@@ -67,3 +67,5 @@ _hosts_package_list:
     state: "{{ host_package_state }}"
   - name: ca-certificates
     state: latest
+
+host_lvm_devices_filter_override: []