Introduce influxdb_datadir_volume

This allows you to tune the performance of InfluxDB by locating the
volume on a drive that is separate to the default docker storage.

Change-Id: Iea555a2702b225b30f5d7035b8a703d4f3376ee7

ansible/group_vars/all.yml

@@ -1041,6 +1041,7 @@ enable_vitrage_prometheus_datasource: "{{ enable_prometheus | bool }}"
 # InfluxDB options
 ####################
 influxdb_address: "{{ kolla_internal_fqdn }}"
+influxdb_datadir_volume: "influxdb"
 
 #########################
 # Internal Image options

ansible/roles/destroy/tasks/cleanup_host.yml

@@ -9,6 +9,7 @@
     glance_file_datadir_volume: "{{ glance_file_datadir_volume }}"
     nova_instance_datadir_volume: "{{ nova_instance_datadir_volume }}"
     gnocchi_metric_datadir_volume: "{{ gnocchi_metric_datadir_volume }}"
+    influxdb_datadir_volume: "{{ influxdb_datadir_volume }}"
     kolla_internal_vip_address: "{{ kolla_internal_vip_address }}"
     kolla_external_vip_address: "{{ kolla_external_vip_address }}"
     kolla_dev_repos_directory: "{{ kolla_dev_repos_directory }}"

ansible/roles/influxdb/defaults/main.yml

@@ -37,6 +37,6 @@ influxdb_dimensions: "{{ default_container_dimensions }}"
 influxdb_default_volumes:
   - "{{ node_config_directory }}/influxdb/:{{ container_config_directory }}/:ro"
   - "/etc/localtime:/etc/localtime:ro"
-  - "influxdb:/var/lib/influxdb"
+  - "{{ influxdb_datadir_volume }}:/var/lib/influxdb"
   - "kolla_logs:/var/log/kolla/"
 influxdb_extra_volumes: "{{ default_extra_volumes }}"

doc/source/reference/logging-and-monitoring/index.rst

@@ -9,6 +9,7 @@ logging and monitoring services available in kolla.
    :maxdepth: 1
 
    central-logging-guide
+   influxdb-guide
    monasca-guide
    osprofiler-guide
    prometheus-guide

doc/source/reference/logging-and-monitoring/influxdb-guide.rst

+.. _influxdb-guide:
+
+===============================
+InfluxDB - Time Series Database
+===============================
+
+Overview
+~~~~~~~~
+
+InfluxDB is a time series database developed by InfluxData. It is
+possible to deploy a single instance without charge. To use the
+clustering features you will require a commercial license.
+
+InfluxDB
+~~~~~~~~
+
+The `recommendation <https://docs.influxdata.com/influxdb/v1.7/guides/hardware_sizing/#what-kind-of-storage-do-i-need>`_
+is to use flash storage for InfluxDB. If docker is configured to use
+spinning disks by default, or you have some higher performance drives
+available, it may be desirable to control where the docker volume is
+located. This can be achieved by setting a path for
+``influxdb_datadir_volume`` in ``/etc/kolla/globals.yml``:
+
+.. code-block:: yaml
+
+    influxdb_datadir_volume: /mnt/ssd/influxdb/
+
+The default is to use a named volume, ``influxdb``.

releasenotes/notes/add-variable-influxdb-datadir-volume-68200f92a3c5d633.yaml

+---
+features:
+  - |
+    Adds a new variable, ``influxdb_datadir_volume``. This allows you control
+    where the docker volume for InfluxDB is created. A performance tuning is
+    to set this to a path on a high performance flash drive.

tools/cleanup-host

@@ -63,6 +63,11 @@ if [[ "$gnocchi_metric_datadir_volume" != "gnocchi" && -d "$gnocchi_metric_datad
     rm -rfv  $gnocchi_metric_datadir_volume
 fi
 
+if [[ "$influxdb_datadir_volume" != "influxdb" && -d "$influxdb_datadir_volume" ]]; then
+    echo "Removing influxdb volume if it is customzied"
+    rm -rfv  $influxdb_datadir_volume
+fi
+
 FOLDER_PATH="/etc/kolla/"
 
 if [[ -e "$FOLDER_PATH/ovsdpdk-db/ovs-dpdkctl.sh" ]]; then