Improve performance of the debian-etch-debootstrap OS

[ext/instance-debootstrap.git] / README

diff --git a/README b/README
index fe2d22a..4f7a558 100644 (file)
--- a/README
+++ b/README
@@ -10,3 +10,22 @@ Notes:
  - no password for root; simply login at the console
  - no network interfaces defined (besides lo); add your own definitions to
    /etc/network/interfaces
+
+Since version 0.3, the OS will cache the image of the first instance it
+installs using the name "cache-$arch.tar" (where $arch is what dpkg
+--print-architecture returns). This cache will be then used on the
+future installs, speeding them greatly (even with a fast mirror). Feel
+free to remove the cache at any time, or to copy it to all nodes. The
+cache will be kept for two weeks, after which the first install will
+recreate the cache (in order not to use old packages). If you don't care
+about package age, remove the user write permission (chmod u-w) from the
+cache and ganeti will continue to use the same file without refreshing
+it.
+
+If you don't have enough space and don't want cache creation, just touch
+the file 'no_cache' - this will prevent the creation, but the script
+will continue to use a cache if it exists (but it will remove an
+existing one after two weeks).
+
+Also note that if the image file is there, the script does not need
+network access at all.