From b5a50e7a8d398d2aab48df6ae4244a5e66a30ebe Mon Sep 17 00:00:00 2001
From: Benedikt Wegmann <Benedikt.Wegmann@gwdg.de>
Date: Thu, 2 Mar 2017 09:40:00 +0100
Subject: [PATCH] zram

---
 README.md                             |  6 ++++++
 files/etc/sysctl.d/60-swappiness.conf |  1 +
 files/usr/bin/init-zram-swapping      | 24 ++++++++++++++++++++++++
 manifests/zram.pp                     | 27 +++++++++++++++++++++++++++
 spec/classes/zram_spec.rb             | 20 ++++++++++++++++++++
 5 files changed, 78 insertions(+)
 create mode 100644 files/etc/sysctl.d/60-swappiness.conf
 create mode 100755 files/usr/bin/init-zram-swapping
 create mode 100644 manifests/zram.pp
 create mode 100644 spec/classes/zram_spec.rb

diff --git a/README.md b/README.md
index a30103a..bdd776a 100644
--- a/README.md
+++ b/README.md
@@ -136,3 +136,9 @@ Installiert das Apt-Modul für automatische Updates. Die Konfiguration installie
 * $autoremove (optional) = Entfernt nicht mehr benötigte Pakete, z.B. alte Kernel. (Default: ```true```)
 * $allowed_origins (optional) = Array mit Quellenangaben für Apt, aus denen Updates installiert werden dürfen. (Default: ```["\${distro_id}:\${distro_codename}-updates","LP-PPA-ubuntu-lxc-lxd-stable:\${distro_codename}","Docker:ubuntu-\${distro_codename}","Puppetlabs:\${distro_codename}"]```)
 * $package_blacklist (optional) = ein Array mit Paketnamen, die von automatischen Updates ausgeschlossen werden. (Default: 'docker-engine')
+
+### ubuntu_server::zram
+
+Installiert `zram-config` Paket zur Einrichtung von komprimierten Blockdevices im RAM ([zram](https://en.wikipedia.org/wiki/Zram)) und mit aktiviertem Swap darauf.
+
+* $agressive (optional) = Setzt die Gesamtgröße der `zram`-Devices auf fast den gesamten RAM statt auf die Hälfte und setzt `vm.swappiness` auf 90 für frühzeitiges auslagern. (Default: `false`)
\ No newline at end of file
diff --git a/files/etc/sysctl.d/60-swappiness.conf b/files/etc/sysctl.d/60-swappiness.conf
new file mode 100644
index 0000000..7aef346
--- /dev/null
+++ b/files/etc/sysctl.d/60-swappiness.conf
@@ -0,0 +1 @@
+vm.swappiness=90
diff --git a/files/usr/bin/init-zram-swapping b/files/usr/bin/init-zram-swapping
new file mode 100755
index 0000000..f0a3085
--- /dev/null
+++ b/files/usr/bin/init-zram-swapping
@@ -0,0 +1,24 @@
+#!/bin/sh
+
+# load dependency modules
+NRDEVICES=$(grep -c ^processor /proc/cpuinfo | sed 's/^0$/1/')
+if modinfo zram | grep -q ' zram_num_devices:' 2>/dev/null; then
+  MODPROBE_ARGS="zram_num_devices=${NRDEVICES}"
+elif modinfo zram | grep -q ' num_devices:' 2>/dev/null; then
+  MODPROBE_ARGS="num_devices=${NRDEVICES}"
+else
+  exit 1
+fi
+modprobe zram $MODPROBE_ARGS
+
+# Calculate memory to use for zram (1/2 of ram)
+totalmem=`LC_ALL=C free | grep -e "^Mem:" | sed -e 's/^Mem: *//' -e 's/  *.*//'`
+mem=$((((totalmem - 102400 )/ ${NRDEVICES}) * 1024))
+
+# initialize the devices
+for i in $(seq ${NRDEVICES}); do
+  DEVNUMBER=$((i - 1))
+  echo $mem > /sys/block/zram${DEVNUMBER}/disksize
+  mkswap /dev/zram${DEVNUMBER}
+  swapon -p 5 /dev/zram${DEVNUMBER}
+done
diff --git a/manifests/zram.pp b/manifests/zram.pp
new file mode 100644
index 0000000..9f243db
--- /dev/null
+++ b/manifests/zram.pp
@@ -0,0 +1,27 @@
+# zram installieren und ggf. swappiness anpassen
+
+class ubuntu_server::zram($agressive=false){
+
+    File{
+        owner => 'root',
+    }
+
+    package{'zram-config':
+        ensure => present,
+    }
+
+    if ( $agressive == true ) {
+        file{'/usr/bin/init-zram-swapping':
+            ensure  => present,
+            source  => 'puppet:///modules/ubuntu_server/usr/bin/init-zram-swapping',
+            mode    => '0755',
+            require => Package['zram-config'],
+        }
+
+        file{'/etc/sysctl.d/60-swappiness.conf':
+            ensure => present,
+            source => 'puppet:///modules/ubuntu_server/etc/sysctl.d/60-swappiness.conf',
+        }
+    }
+
+}
diff --git a/spec/classes/zram_spec.rb b/spec/classes/zram_spec.rb
new file mode 100644
index 0000000..f9c5c99
--- /dev/null
+++ b/spec/classes/zram_spec.rb
@@ -0,0 +1,20 @@
+require 'spec_helper'
+
+describe "ubuntu_server::zram" do
+
+  context "with class defaults" do
+    it { is_expected.to compile.with_all_deps }
+    it { is_expected.not_to contain_file('/usr/bin/init-zram-swapping') }
+    it { is_expected.not_to contain_file('/etc/sysctl.d/60-swappiness.conf') }
+  end
+
+  context "with $agressive = true" do
+    let(:params) {{
+      :agressive => true,
+    }}
+    it { is_expected.to compile.with_all_deps }
+    it { is_expected.to contain_file('/usr/bin/init-zram-swapping') }
+    it { is_expected.to contain_file('/etc/sysctl.d/60-swappiness.conf') }
+  end
+
+end
-- 
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