3 files changed, 48 insertions, 1 deletions
diff --git a/puppet/modules/site_config/manifests/default.pp b/puppet/modules/site_config/manifests/default.pp
index cfb46130..5518ea56 100644
--- a/puppet/modules/site_config/manifests/default.pp
+++ b/puppet/modules/site_config/manifests/default.pp
@@ -12,10 +12,14 @@ class site_config::default {
   # configure apt
   include site_apt
 
-
   # configure ssh and include ssh-keys
   include site_config::sshd
 
+  # fix dhclient from changing resolver information
+  if $::ec2_instance_id {
+    include site_config::dhclient
+  }
+
   # configure /etc/resolv.conf
   include site_config::resolvconf
 
diff --git a/puppet/modules/site_config/manifests/dhclient.pp b/puppet/modules/site_config/manifests/dhclient.pp
new file mode 100644
index 00000000..7ac0caf3
--- /dev/null
+++ b/puppet/modules/site_config/manifests/dhclient.pp
@@ -0,0 +1,30 @@
+class site_config::dhclient {
+
+  # Unfortunately, there does not seem to be a way to reload the dhclient.conf
+  # config file, or a convenient way to disable the modifications to
+  # /etc/resolv.conf. So the following makes the functions involved noops and
+  # ships a script to kill and restart dhclient. See the debian bugs:
+  # #681698, #712796
+
+  include site_config::params
+
+  file { '/usr/local/sbin/reload_dhclient':
+    owner   => 0,
+    group   => 0,
+    mode    => '0755',
+    content => template('site_config/reload_dhclient.erb');
+  }
+
+  exec { 'reload_dhclient':
+    refreshonly => true,
+    command     => '/usr/local/sbin/reload_dhclient';
+  }
+
+  file { '/etc/dhcp/dhclient-enter-hooks.d/disable_resolvconf':
+    content => 'make_resolv_conf() { : ; } ; set_hostname() { : ; }',
+    mode    => '0644',
+    owner   => 'root',
+    group   => 'root',
+    notify  => Exec['reload_dhclient'];
+  }
+}
diff --git a/puppet/modules/site_config/templates/reload_dhclient.erb b/puppet/modules/site_config/templates/reload_dhclient.erb
new file mode 100644
index 00000000..882c985a
--- /dev/null
+++ b/puppet/modules/site_config/templates/reload_dhclient.erb
@@ -0,0 +1,13 @@
+#!/bin/sh
+
+# Get the PID
+PIDFILE='/var/run/dhclient.<%= scope.lookupvar('site_config::params::interface') %>.pid
+
+# Capture how dhclient is currently running so we can relaunch it
+dhclient=`/bin/ps --no-headers --pid $(cat $PIDFILE) -f | /usr/bin/awk '{for(i=8;i<=NF;++i) printf("%s ",  $i) }'`
+
+# Kill the current dhclient
+/usr/bin/pkill -F $PIDFILE
+
+# Restart dhclient with the arguments it had previously
+$dhclient