puppet: Add script to configure Postgres master disks

(imported from commit 61004aa839df8f3fa82ba0c4ea9e2a01ae43464c)

servers/puppet/modules/humbug/files/postgresql/setup_disks.sh

@@ -0,0 +1,14 @@
+#!/bin/sh
+umount /mnt
+yes | mdadm --create /dev/md0 --raid-devices=2 --level=1 /dev/xvdb /dev/xvdc
+blockdev --setra 4096 /dev/xvdb
+blockdev --setra 4096 /dev/xvdc
+blockdev --setra 4096 /dev/md0
+mkfs.xfs /dev/md0
+echo "/dev/md0   /srv  xfs    noatime,barrier 1 1" >> /etc/fstab
+mount /srv
+
+pg_ctlcluster 9.1 main stop
+mv /var/lib/postgresql /srv
+ln -s /srv/postgresql/ /var/lib
+pg_ctlcluster 9.1 main start

servers/puppet/modules/humbug/manifests/postgres-master.pp

@@ -1,6 +1,9 @@
 class humbug::postgres-master {
   class { 'humbug::postgres-common': }
 
+  $master_packages = [ "xfsprogs", "mdadm", ]
+  package { $master_packages: ensure => "installed" }
+
   file { '/etc/sysctl.d/30-postgresql-shm.conf':
     ensure => file,
     owner  => 'root',
@@ -17,4 +20,18 @@ class humbug::postgres-master {
     mode => 644,
     source => "puppet:///modules/humbug/postgresql/postgresql.conf.master",
   }
+
+  file { "/root/setup_disks.sh":
+    ensure => file,
+    owner  => 'root',
+    group  => 'root',
+    mode   => 744,
+    source => 'puppet:///modules/humbug/postgresql/setup_disks.sh',
+  }
+
+  exec { "setup_disks":
+    command => "/root/setup_disks.sh",
+    require => Package["postgresql-9.1", "xfsprogs", "mdadm"],
+    creates => "/dev/md0"
+  }
 }