Changes between Version 4 and Version 5 of how-to/puppet/dev-env

Timestamp:

Apr 23, 2011, 7:36:10 PM (14 years ago)

Author:

Greg Lyle

Comment:

--

how-to/puppet/dev-env

@@ -27 +27 @@
  * confdir - put the MFPL git repo here (e.g. `git clone gitosis@git.mayfirst.org/mfpl/puppet confdir`)
 
- * images - download [/special/roach.qcow.gz roach.qcow.gz] into your images directory. Don't gunzip right away! Instead, make a backup copy (so you don't have to re-download it if you mess it up), then gunzip it.
+ * images - download [/special/roach.qcow.gz roach.qcow.gz] into your images directory. Don't gunzip right away! Instead, make a backup copy (so you don't have to re-download it if you mess it up), then gunzip it. [0]
  {{{
 cp roach.qcow.gz roach.qcow.bak.gz; gunzip roach.qcow.gz
@@ -88 +88 @@
 git push roach master
 }}}
+
+
+=== Using a copy-on-write image ===
+Alternately, one can create a copy-on-write image to save only the changes made when working with a "base" image. The syntax is:
+{{{
+qemu-img create -b <path to base image> -f <image format> <path to copy-on-write image>
+}}}
+For the roach image, this would be:
+{{{
+qemu-img create -b images/roach.qcow -f qcow2 images/roach-changes.qcow2
+}}}
+Then one would use "images/roach-changes.qcow2" as the value of the -hda parameter when starting the virtual image.