[okfn-help] Moved munin master and munin monitoring working on all nodes

[Rufus Pollock]

Yesterday with Martin Keegan's help I moved the munin master from us1
to eu1 in order to:

a) improve the munin monitoring (intermittency of graphs was being
caused by poor performance on us1)
b) to pave the way for reducing load on us1 by removing munin monitoring

As of yesterday evening:

  <http://munin.okfn.org/> is now running from the new master
  <http://munin.us1.okfn.org> shows the munin master on us1

There was some break in monitoring as it turned out hte AWS firewall
needed to be updated to let eu1 monitor AWS hosts. After allowing a
few days to check all is ok I propose we turn off the master on us1.

I have documented some of the lessons:

<http://knowledgeforge.net/okfn/tasks/wiki/MonitoringService>

There is also a new fab command 'munin_node_install' to automatically
install a munin node and configure it:

<http://knowledgeforge.net/okfn/tasks/browser/bin/fabfile.py#L433>

All nodes are now being monitored and I am therefore closing:

<http://knowledgeforge.net/okfn/tasks/ticket/321>

Rufus