hail: Fix result for node evacuation

[ganeti-local] / INSTALL

diff --git a/INSTALL b/INSTALL
index 21f65cc..cb56e80 100644 (file)
--- a/INSTALL
+++ b/INSTALL
@@ -20,17 +20,25 @@ Before installing, please verify that you have the following programs:
 - `DRBD <http://www.drbd.org/>`_, kernel module and userspace utils,
   version 8.0.7 or above
 - `LVM2 <http://sourceware.org/lvm2/>`_
-- `OpenSSL <http://www.openssl.org/>`_
 - `OpenSSH <http://www.openssh.com/portable.html>`_
 - `bridge utilities <http://www.linuxfoundation.org/en/Net:Bridge>`_
 - `iproute2 <http://www.linuxfoundation.org/en/Net:Iproute2>`_
 - `arping <http://www.skbuff.net/iputils/>`_ (part of iputils)
+- `ndisc6 <http://www.remlab.net/ndisc6/>`_ (if using IPv6)
 - `Python <http://www.python.org/>`_, version 2.4 or above, not 3.0
 - `Python OpenSSL bindings <http://pyopenssl.sourceforge.net/>`_
 - `simplejson Python module <http://code.google.com/p/simplejson/>`_
-- `pyparsing Python module <http://pyparsing.wikispaces.com/>`_
+- `pyparsing Python module <http://pyparsing.wikispaces.com/>`_, version
+  1.4.6 or above
 - `pyinotify Python module <http://trac.dbzteam.org/pyinotify/>`_
-- `socat <http://www.dest-unreach.org/socat/>`_
+- `PycURL Python module <http://pycurl.sourceforge.net/>`_
+- `ctypes Python module
+  <http://starship.python.net/crew/theller/ctypes/>`_, if running on
+  python 2.4 (optional, used for node daemon memory locking)
+- `socat <http://www.dest-unreach.org/socat/>`_, see :ref:`note
+  <socat-note>` below
+- `Paramiko <http://www.lag.net/paramiko/>`_, if you want automated SSH
+  setup; optional otherwise but manual setup of the nodes required
 
 These programs are supplied as part of most Linux distributions, so
 usually they can be installed via the standard package manager. Also
@@ -39,12 +47,70 @@ Debian/Ubuntu, you can use this command line to install all required
 packages, except for DRBD and Xen::
 
   $ apt-get install lvm2 ssh bridge-utils iproute iputils-arping \
-                    python python-pyopenssl openssl python-pyparsing \
-                    python-simplejson python-pyinotify socat
+                    ndisc6 python python-pyopenssl openssl \
+                    python-pyparsing python-simplejson \
+                    python-pyinotify python-pycurl socat
+
+If you want to also enable the `htools` components, which is recommended
+on bigger deployments (they give you automatic instance placement,
+cluster balancing, etc.), then you need to have a Haskell compiler
+installed. More specifically:
+
+- `GHC <http://www.haskell.org/ghc/>`_ version 6.10 or higher
+- or even better, `The Haskell Platform
+  <http://hackage.haskell.org/platform/>`_ which gives you a simple way
+  to bootstrap Haskell
+- `json <http://hackage.haskell.org/package/json>`_, a JSON library
+- `network <http://hackage.haskell.org/package/network>`_, a basic
+  network library
+- `parallel <http://hackage.haskell.org/package/parallel>`_, a parallel
+  programming library (note: tested with up to version 3.x)
+- `curl <http://hackage.haskell.org/package/curl>`_, bindings for the
+  curl library, only needed if you want these tools to connect to remote
+  clusters (as opposed to the local one)
+
+All of these are also available as package in Debian/Ubuntu::
+
+  $ apt-get install ghc6 libghc6-json-dev libghc6-network-dev \
+                    libghc6-parallel-dev libghc6-curl-dev
+
+Note that more recent version have switched to GHC 7.x and the packages
+were renamed::
+
+  $ apt-get install ghc libghc-json-dev libghc-network-dev \
+                    libghc-parallel-dev libghc-curl-dev
+
+The compilation of the htools components is automatically enabled when
+the compiler and the requisite libraries are found. You can use the
+``--enable-htools`` configure flag to force the selection (at which
+point ``./configure`` will fail if it doesn't find the prerequisites).
 
 If you want to build from source, please see doc/devnotes.rst for more
 dependencies.
 
+.. _socat-note:
+.. note::
+  Ganeti's import/export functionality uses ``socat`` with OpenSSL for
+  transferring data between nodes. By default, OpenSSL 0.9.8 and above
+  employ transparent compression of all data using zlib if supported by
+  both sides of a connection. In cases where a lot of data is
+  transferred, this can lead to an increased CPU usage. Additionally,
+  Ganeti already compresses all data using ``gzip`` where it makes sense
+  (for inter-cluster instance moves).
+
+  To remedey this situation, patches implementing a new ``socat`` option
+  for disabling OpenSSL compression have been contributed and will
+  likely be included in the next feature release. Until then, users or
+  distributions need to apply the patches on their own.
+
+  Ganeti will use the option if it's detected by the ``configure``
+  script; auto-detection can be disabled by explicitely passing
+  ``--enable-socat-compress`` (use the option to disable compression) or
+  ``--disable-socat-compress`` (don't use the option).
+
+  The patches and more information can be found on
+  http://www.dest-unreach.org/socat/contrib/socat-opensslcompress.html.
+
 
 Installation of the software
 ----------------------------