Enable snapshots for InfluxDB

This change allows the operator to backup the InfluxDB database using
the 'influxd backup' command.

Change-Id: Id23eb027de719b5f4fb44cac39d5eaf3dc8ae775

deployment_scripts/puppet/modules/influxdb/manifests/configure.pp

@@ -22,6 +22,7 @@ class influxdb::configure (
   $meta_dir     = undef,
   $wal_dir      = undef,
   $hh_dir       = undef,
+  $snapshot     = undef,
 ) {
 
   Ini_setting {
@@ -83,4 +84,10 @@ class influxdb::configure (
     setting => 'dir',
     value   => "\"${meta_dir}\"",
   }
+
+  ini_setting { 'snapshot':
+    section => 'snapshot',
+    setting => 'enabled',
+    value   => $snapshot,
+  }
 }

deployment_scripts/puppet/modules/influxdb/manifests/init.pp

@@ -19,6 +19,7 @@ class influxdb (
   $hh_dir     = $influxdb::params::hh_dir,
   $meta_dir   = $influxdb::params::meta_dir,
   $wal_dir    = $influxdb::params::wal_dir,
+  $snapshot   = $influxdb::params::snapshot,
   $hostname   = undef,
   $raft_nodes = undef,
 ) inherits influxdb::params {
@@ -39,6 +40,7 @@ class influxdb (
     hh_dir       => $hh_dir,
     meta_dir     => $meta_dir,
     wal_dir      => $wal_dir,
+    snapshot     => $snapshot,
     notify       => Class['influxdb::service'],
   }
 }

deployment_scripts/puppet/modules/influxdb/manifests/params.pp

@@ -24,4 +24,6 @@ class influxdb::params {
   $hh_dir   = "${base_dir}/hh"
   $meta_dir = "${base_dir}/meta"
   $wal_dir  = "${base_dir}/wal"
+
+  $snapshot = false
 }

deployment_scripts/puppet/modules/influxdb/spec/classes/influxdb_configure_spec.rb

@@ -26,5 +26,6 @@ describe 'influxdb::configure' do
         it { is_expected.to contain_ini_setting('wal_dir') }
         it { is_expected.to contain_ini_setting('hh_dir') }
         it { is_expected.to contain_ini_setting('meta_dir') }
+        it { is_expected.to contain_ini_setting('snapshot') }
     end
 end

deployment_scripts/puppet/modules/lma_monitoring_analytics/manifests/influxdb.pp

@@ -29,6 +29,7 @@ class lma_monitoring_analytics::influxdb (
     meta_dir   => "${base_directory}/meta",
     hh_dir     => "${base_directory}/hh",
     wal_dir    => "${base_directory}/wal",
+    snapshot   => true,
     hostname   => $hostname,
     raft_nodes => $raft_nodes,
   }