Synnefo » snf-ganeti » ganeti-local

(e.g. more than five or ten machines); at lower sizes, the computations

they do can also be done manually.

Most of the tools revolve around the concept of keeping the cluster N+1

compliant: this means that in case of failure of any node, the instances

affected can be failed over (via ``gnt-node failover`` or ``gnt-instance

failover``) to their secondary node, and there is enough memory reserved

for this operation without needing to shutdown other instances or

rebalance the cluster.

and non-mirrored instances and for relocations of mirrored instances. It

needs to be installed in Ganeti's iallocator search path—usually

``/usr/lib/ganeti/iallocators`` or

``/usr/local/lib/ganeti/iallocators``, and after that it can be used via

ganeti's ``--iallocator`` option (in various gnt-node/gnt-instance

text files, locally from the master daemon (when run on the master node

of a cluster), or remote from a cluster via RAPI. The "-L" argument

enables local collection (with an optional path to the unix socket). For

online collection via RAPI, the "-m" argument should specify the cluster

or master node name. Only ``hbal`` and ``hspace`` use these arguments,

``hail`` uses the standard iallocator API and thus doesn't need any

special setup (just needs to be installed in the right directory).

to automate their gathering if RAPI is available, which is better since

it can extract more precise information. In case RAPI is not usable for

whatever reason, the following two commands should be run::

Once these are installed, just typing *make* in the top-level directory

should be enough.

Only the ``hail`` program needs to be installed in a specific place, the

other tools are not location-dependent.

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