.. -*- mode: rst -*-

.. _server-snapshots-index:

===============
Bcfg2 Snapshots
===============

.. versionadded:: 1.0.0

This page describes the Snapshots plugin. This plugin is meant to replace
the older :ref:`server-reports-dynamic`. It stores various
aspects of a client's state when the client checks into the server.

Before you begin
================

Make sure you have version 0.5 or greater of sqlalchemy.

On CentOS/RHEL 5
----------------

* Download a tarball of SQLAlchemy.
* Extract and build the RPM::

      tar xzf SQLAlchemy-0.5.6.tar.gz
      cd SQLAlchemy-0.5.6
      python setup.py bdist_rpm

* Copy the RPM in ``SQLAlchemy-0.5.6/dist/`` to your Yum repository,
  and rebuild the repository using ``createrepo``.
* Clear the Yum cache::

      sudo yum clean all

* Install SQLAlchemy::

      sudo yum install SQLAlchemy

* Manage the package in Bcfg2 as you would any other package.

Configuration
=============

* A database location needs to be added to ``bcfg2.conf``. Three drivers
  are currently supported; mysql, postgres, and sqlite. When using the
  sqlite driver, only the driver and database lines are required.

  * For MySQL::

        [snapshots]
        driver = mysql
        database = snapshots
        user = snapshots
        password = snapshots
        host = dbserver

  * For SQLite::

        [snapshots]
        driver = sqlite
        database = /var/lib/bcfg2/var/snapshots.sqlite

* The database needs to be initialized.::

      $ bcfg2-admin snapshots init
      2009-03-22 21:40:24,683 INFO sqlalchemy.engine.base.Engine.0x...3e2c PRAGMA table_info("connkeyval")
      PRAGMA table_info("connkeyval")
      2009-03-22 21:40:24,684 INFO sqlalchemy.engine.base.Engine.0x...3e2c ()
      ()
      2009-03-22 21:40:24,686 INFO sqlalchemy.engine.base.Engine.0x...3e2c PRAGMA table_info("package")
      PRAGMA table_info("package")
      2009-03-22 21:40:24,687 INFO sqlalchemy.engine.base.Engine.0x...3e2c ()
      ()
      .....
      COMMIT

* The Snapshots plugin needs to be enabled for the bcfg2-server (by adding
  Snapshots to the plugins line in ``/etc/bcfg2.conf``). Once done,
  this will cause the the server to store statistics information when
  clients run.

Using the reports interface
===========================

All hosts::

    $ bcfg2-admin snapshots reports -a

    ============= ========= ========================================== ============================
    Client        Correct   Revision                                   Time
    ============= ========= ========================================== ============================
    bcfg2client   True      f46ac7773712bd3c3cfb765ae5d2a3b2a37ac9b7   2009-04-23 11:27:54.378941
    ============= ========= ========================================== ============================

List bad entries for a single host::

    $ bcfg2-admin snapshots reports -b bcfg2client
    Bad entries:
     Package:nscd
     Package:cupsys
     File:/etc/ldap.conf

List extra entries for a single host::

    $ bcfg2-admin snapshots reports -e bcfg2client
    Extra entries:
     Package:python-pyxattr
     Package:librsync1
     Package:python-pylibacl
     Package:gcc-4.2-multilib
     Package:nxlibs
     Package:freenx-session-launcher
     Package:dx-doc
     Package:dirdiff
     Package:libhdf4g
     Package:nxclient
     Package:freenx-rdp
     Package:freenx-vnc
     Package:libxml2-dev
     Package:mysql-client
     Package:mysql-client-5.0
     Package:libxcompext3
     Package:lib32gomp1
     Package:dx
     Package:freenx-media
     Package:dxsamples
     Package:gcc-multilib
     Package:rdiff-backup
     Package:libdbd-mysql-perl
     Package:libxcomp3
     Package:freenx-server
     Package:smbfs
     Package:planner
     Package:nxagent
     Package:libc6-dev-i386
     Package:libfltk1.1-dev
     Package:freenx
     Package:libdx4
     Package:libxcompshad3
     Service:freenx-server

Detailed view of hosts for a particular date::

    $ bcfg2-admin snapshots reports --date 2009 5 30
    ============= ========= ========================================== ============================
    Client        Correct   Revision                                   Time
    ============= ========= ========================================== ============================
    bcfg2client   False     10c1a12c62c57c0861cc453b8d2640c4839a7357   2009-05-29 10:52:34.701056

TODO/Wishlist
=============

* Identify per-client changes in correctness over time
* Detailed view for a particular date
* Track entry changes over time (glibc updated on these dates to these versions)