Add Ceph OSD cpuset tuning options

Allows an administrator to set CPU pinning with the cpuset tool for Ceph
OSDs, in situations where CPU contention with VMs or other system tasks
may be negatively affecting OSD performance. This is optional, advanced
tuning and is disabled by default.

roles/pvc/tasks/ceph/main.yml

@@ -117,4 +117,55 @@
     - ceph-mon@{{ ansible_hostname }}
     - ceph-mgr@{{ ansible_hostname }}
 
+# System OSD CPU shielding activation
+- block:
+    - name: install packages
+      apt:
+        name:
+          - cpuset
+          - numactl
+        state: latest
+
+    - name: install ceph-osd-cpuset script
+      template:
+        src: ceph/ceph-osd-cpuset.j2
+        dest: /usr/local/sbin/ceph-osd-cpuset
+        mode: 0755
+
+    - name: install ceph-osd-cpuset service unit
+      template:
+        src: ceph/ceph-osd-cpuset.service.j2
+        dest: /etc/systemd/system/ceph-osd-cpuset.service
+      register: systemd_file_cpuset
+
+    - name: create ceph-osd override dropin directory
+      file:
+        dest: /etc/systemd/system/ceph-osd@.service.d
+        state: directory
+
+    - name: install ceph-osd override dropin
+      template:
+        src: ceph/ceph-osd-cpuset.conf.j2
+        dest: /etc/systemd/system/ceph-osd@.service.d/cpuset.conf
+      register: systemd_file_osd
+
+    - name: reload systemd to apply previous changes
+      command: "systemctl daemon-reload"
+      when: systemd_file_cpuset.changed or systemd_file_osd.changed
+
+    - name: enable ceph-osd-cpuset service
+      service:
+        name: ceph-osd-cpuset
+        enabled: yes
+
+    - debug:
+        msg: "NOTICE: cpuset configs have NOT been applied to the running system. This node must be rebooted to apply these changes."
+      when: systemd_file_cpuset.changed or systemd_file_osd.changed
+  tags: pvc-ceph-cpuset
+  when:
+    - pvc_shield_osds_enable is defined
+    - pvc_shield_osds_enable
+    - pvc_shield_osds_cset is defined
+    - pvc_shield_osds_cset | selectattr('hostname', 'equalto', inventory_hostname) | list | count > 0
+
 - meta: flush_handlers

roles/pvc/tasks/main.yml

@@ -23,17 +23,9 @@
   when: newhost is defined and newhost
   tags: always
 
-# General blacklisting of modules
-- name: add module blacklist
-  template:
-    src: system/blacklist.j2
-    dest: /etc/modprobe.d/blacklist.conf
-
-# Logrotate configuration
-- name: add logrotate configuration
-  template:
-    src: system/pvc.j2
-    dest: /etc/logrotate.d/pvc
+# Install system tweaks
+- include: system/main.yml
+  tags: pvc-system
 
 # Install base databases (coordinators only)
 - include: ceph/main.yml

roles/pvc/tasks/system/main.yml

@@ -0,0 +1,14 @@
+---
+# General blacklisting of modules
+- name: add module blacklist
+  template:
+    src: system/blacklist.j2
+    dest: /etc/modprobe.d/blacklist.conf
+
+# Logrotate configuration
+- name: add logrotate configuration
+  template:
+    src: system/pvc.j2
+    dest: /etc/logrotate.d/pvc
+
+- meta: flush_handlers