[Maas-devel] MAAS nodes and swap

[Andreas Hasenack]

On Mon, Nov 11, 2013 at 10:00 AM, Andreas Hasenack <andreas at canonical.com>wrote:

> Hi, thanks for the pointers.
>
> I'm looking at /etc/maas/preseeds, and some of those files are
> cloud-config files. In particular I see curtin_userdata, which seems to
> imply that I could add my swap setup script in there, and have it used by
> the fastpath installer (curtin).
>
> Attached is what I came up with for when using the fastpath installer. If
you have a second disk (vdb), it will use that as swap. Otherwise, it will
create a swap file image on /.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <https://lists.ubuntu.com/archives/maas-devel/attachments/20131111/d60b2721/attachment.html>
-------------- next part --------------
--- curtin_userdata.orig        2013-11-11 13:48:57.104917044 +0000
+++ curtin_userdata     2013-11-11 13:49:13.004917045 +0000
@@ -1,4 +1,21 @@
 #cloud-config
+setupswap:
+ - &setup_swap |
+   if [ -e /dev/vdb ]; then
+     mkswap -f /dev/vdb -L swap
+     swapline="/dev/vdb none swap sw 0 0"
+     echo "Setting up swap on /dev/vdb"
+   elif [ ! -f $TARGET_MOUNT_POINT/swap.img ]; then
+     dd if=/dev/zero of=$TARGET_MOUNT_POINT/swap.img bs=100M count=10
+     mkswap $TARGET_MOUNT_POINT/swap.img
+     swapline="/swap.img none swap sw 0 0"
+     echo "Setting up swap on /swap.img"
+   fi
+   if [ -z "$swapline" ]; then
+     echo "Couldn't setup swap"
+   elif ! grep -q swap $TARGET_MOUNT_POINT/etc/fstab; then
+     echo "$swapline" >> $TARGET_MOUNT_POINT/etc/fstab
+   fi
 debconf_selections:
  maas: |
   {{for line in str(curtin_preseed).splitlines()}}
@@ -6,6 +23,7 @@
   {{endfor}}
 late_commands:
   maas: [wget, '--no-proxy', '{{node_disable_pxe_url|escape.shell}}', '--post-data', '{{node_disable_pxe_data|escape.shell}}', '-O', '/dev/null']
+  swap: [sh, -c, *setup_swap]

 power_state:
   mode: reboot