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authorSol Jerome <solj@ices.utexas.edu>2010-02-01 02:28:39 +0000
committerSol Jerome <solj@ices.utexas.edu>2010-02-01 02:28:39 +0000
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doc: Add server/reports sections
Signed-off-by: Sol Jerome <solj@ices.utexas.edu> git-svn-id: https://svn.mcs.anl.gov/repos/bcfg/trunk/bcfg2@5709 ce84e21b-d406-0410-9b95-82705330c041
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-.. -*- mode: rst -*-
-
-.. _plugins-generators-cfg:
-
-===
-Cfg
-===
-
-The Cfg plugin provides a repository to describe configuration file contents for clients. In its simplest form, the Cfg repository is just a directory tree modeled off of the directory tree on your client machines.
-
-The Cfg Repository
-==================
-
-The Cfg plugin is enabled by including `Cfg` on the `plugins` line of the `[server]` section of your Bcfg2 server config file. The repository itself lives in `/var/lib/bcfg2/Cfg`, assuming you are using the default repository location of `/var/lib/bcfg2`. The contents of this directory are a series of directories corresponding to the real-life locations of the files on your clients, starting at the root level. For example::
-
- lueningh@tg-prez:~/bcfg2/repository> ls Cfg
- bin/ boot/ etc/ opt/ root/ usr/ var/
-
-Specific config files go in like-named directories in this heirarchy. For example the password file, `/etc/passwd`, goes in `Cfg/etc/passwd/passwd`, while the ssh pam module config file, `/etc/pam.d/sshd`, goes in `Cfg/etc/pam.d/sshd/sshd`. The reason for the like-name directory is to allow multiple versions of each file to exist, as described below. Note that these files are exact copies of what will appear on the client machine - no templates, XML wrappers, etc.
-
-Group-Specific Files
-====================
-
-It is often that you want one version of a config file for all of your machines except those in a particular group. For example, `/etc/fstab` should look alike on all of your desktop machines, but should be different on your file servers. Bcfg can handle this case through use of group-specific files.
-
-As mentioned above, all Cfg entries live in like-named directories at the end of their directory tree. In the case of `fstab`, the file at `Cfg/etc/fstab/fstab` will be handed out by default to any client that asks for a copy of `/etc/fstab`. Group-specific files are located in the same directory and are named with the syntax::
-
- /path/to/filename/filename.GNN_groupname
-
-in which ''NN'' is a priority number where '00' is lowest and '99' is highest, and ''groupname'' is the name of a group defined in `Metadata/groups.xml`. Back to our `fstab` example, we might have a `Cfg/etc/fstab/` directory that looks like::
-
- fstab
- fstab.G50_server
- fstab.G99_fileserver
-
-By default, clients will receive the plain `fstab` file when they request `/etc/fstab`. Any machine that is in the `server` group, however, will instead receive the `fstab.G50_server` file. Finally, any machine that is in the `fileserver` group will receive the `fstab.G99_fileserver` file, even if they are also in the `server` group.
-
-Host-Specific Files
-===================
-
-Similar to the case with group-specific files, there are cases where a specific machine should have a different version of a file than all others. This can be accomplished with host-specific files. The format of a host-specific file name is::
-
- /path/to/filename/filename.H_host.example.com
-
-Host-specific files have a higher priority than group specific files. Again, the `fstab` example::
-
- fstab
- fstab.G50_server
- fstab.G99_fileserver
- fstab.H_host.example.com
-
-In this case, `host.example.com` will always get the host-specific version, even if it is part of the `server` or `fileserver` (or both) classes.
-
-.. note:: If you have the ability to choose between using a group-specific file and a host-specific file, it is almost always best to use a group-specific one. That way if a hostname changes or an extra copy of a particular client is built, it will get the same changes as the original.
-
-Info files
-==========
-
-By default, Cfg writes files to the filesystem with owner `root`, group `root`, and mode 644 (read and write for owner, read only for group and other). These options, and a few others, can be overridden through use of `:info` files. Each config file directory can have a `:info` file if needed. The possible fields in a `:info` file are:
-
-+-----------+-------------------+------------------------------------------------------+---------+
-| Field | Possible values | Description | Default |
-+===========+===================+======================================================+=========+
-| owner: | Any valid user | Sets owner of the file | root |
-+-----------+-------------------+------------------------------------------------------+---------+
-| group: | Any valid group | Sets group of the file | root |
-+-----------+-------------------+------------------------------------------------------+---------+
-| perms: | Numeric file mode | Sets the permissions of the file | 0644 |
-+-----------+-------------------+------------------------------------------------------+---------+
-| encoding: | ascii | base64 | Encoding of the file. Use base64 for non-ASCII files | ascii |
-+-----------+-------------------+------------------------------------------------------+---------+
-| paranoid: | yes | no | Backup file before replacement? | no |
-+-----------+-------------------+------------------------------------------------------+---------+
-
-A sample `:info` file for CGI script on a web server might look like::
-
- owner: www
- group: www
- perms: 0755
-
-Back to the `fstab` example again, our final `Cfg/etc/fstab/` directory might look like::
-
- :info
- fstab
- fstab.G50_server
- fstab.G99_fileserver
- fstab.H_host.example.com
-
-info.xml files
-==============
-
-This feature is included in version 0.9.5pre3 and newer of the bcfg2 server.
-
-info.xml files add the ability to specify different sets of file metadata on a group by group basis. These files are XML, and work similarly to those used by [wiki:Plugins/Rules Rules] or [wiki:Plugins/Pkgmgr Pkgmgr].
-
-The following specifies a different global set of permissions (root/sys/0651) than on clients in group webserver (root/root/0652)
-
-.. code-block:: xml
-
- <FileInfo>
- <Group name='webserver'>
- <Info owner='root' group='root' perms='0652'/>
- </Group>
- <Info owner='root' group='sys' perms='0651'/>
- </FileInfo>