readme for apt-cacher

README.md

@@ -199,6 +199,37 @@ folder under the result of running `rvm info` as the default SSH user (usualy
 it is already installed before enabling the bucket, otherwise you won't benefit
 from this plugin.
 
+
+##### APT-CACHER
+
+```ruby
+Vagrant.configure("2") do |config|
+  config.vm.box = 'some-debian-box'
+  config.cache.enable :apt_cacher
+end
+```
+
+This is useful, if you are using containers inside your VMs, e.g VirtualBox -> LXC. This would allow you to reuse packages without sharing folder inside VirtualBox. Only works with NFS-shared folders (since `vboxsf` is enforcing `vagrant`-user and `apt-cacher` is running under `apt-cacher-ng` user)
+
+    # install apt-cacher on (Host)-VM
+    $ sudo apt-get install apt-cacher-ng
+
+    # get the IP for eth0 interface
+    $ ifconfig eth0 |grep "inet addr"|awk '{print $2}' |cut -c6-20
+
+    # configure mirror on for your docker/LXC instances:
+    $ echo 'Acquire::http { Proxy "http://X.X.X.X:3142"; };' > /etc/apt/apt.conf.d/10mirror
+
+    # check, if working by tailing log on (Host)-VM, while installing packages on (Guest)-VMs
+    $ tail -f /var/log/apt-cacher-ng/apt-cacher.log
+
+
+Used by Debian-like Linux distros, will get configured under guest's `/var/cache/apt-cacher-ng`.
+
+_Please note that to avoid re-downloading packages, you should avoid `apt-get clean`
+as much as possible in order to make a better use of the cache, even if you are
+packaging a box_
+
 ## Finding out disk space used by buckets
 
 _TODO_