Add more usage examples

doc/source/usage.rst

@@ -9,9 +9,9 @@ Basically, the ``timmy.py`` is a simple wrapper that launches ``cli.py``.
 
 Basic parameters:
 
-* ``--only-logs`` collect only logs (skip files, filelists, commands and scripts)
+* ``--only-logs`` only collect logs (skip files, filelists, commands and scripts)
 * ``-l``, ``--logs`` also collect logs (logs are not collected by default due to their size)
-* ``-C <command>`` enables ``shell mode``\*, Bash command (string) to execute on nodes
+* ``-C <command>`` enables ``shell mode``\*, Bash command (string) to execute on nodes. Using multiple ``-C`` statements will give the same result as using one with several commands separated by ``;`` (traditional Shell syntax), but for each ``-C`` statement a new SSH connection is established
 * ``-S <script>`` enables ``shell mode``, name of the Bash script file (you need to put it into ``scripts`` folder inside a path specified by ``rqdir`` config parameter, defaults to ``rq``) to execute on nodes
 * ``-P <file/path> <dest>`` enables ``shell mode``, upload local data to nodes (wildcards supported). You must specify 2 values for each ``-P`` switch.
 * ``-G <file/path>`` enables ``shell mode``, download (collect) data from nodes
@@ -25,4 +25,78 @@ Basic parameters:
 
 Shell mode - rqfile (``rq.yaml`` by default) is skipped, Fuel node is skipped, outputs of commands (specified with ``-C`` options) and scripts (specified with ``-S``) are printed on screen.
 
+=====
+Examples
+=====
+
+* ``timmy -C 'uptime; free -m'`` - check uptime and memory on all nodes
+* ``timmy -G /etc/nova/nova.conf`` - get nova.conf from all nodes
+* ``timmy -R controller -P package.deb '' -C 'dpkg -i package.deb' -C 'rm package.deb' -C 'dpkg -l | grep [p]ackage'`` - push a package to all nodes, install it, remove the file and check that it is installed
+* ``timmy -с myconf.yaml`` - use a custom config file and run according to it
+
+=====
+Using custom configuration file
+=====
+
+If you want to do a set of actions on the nodes and you do not want to write a long command line (or you want to use options only available in config), you may want to set up config file instead. An example config structure would be:
+
+::
+
+  rqdir: './pacemaker-debug' # a folder which should contain any filelists and/or scripts if they are defined later, should contain folders 'filelists' and/or 'scripts' 
+  rqfile: None # explicitly undefine rqfile to skip default filelists and scripts
+  hard_filter:
+    roles: # only execute on Fuel and controllers
+      - fuel
+      - controller 
+  cmds: # some commands to run on all nodes (after filtering). cmds syntax is {name: value, ...}. cmds are executed in alphabetical order of names.
+    01-my-first-command: 'uptime'
+    02-disk-check: 'df -h'
+    and-also-ram: 'free -m'
+  by_roles:
+    controller:
+      scripts: # I use script here to not overwrite cmds we have already defined for all nodes earlier
+        - pacemaker-debug.sh # the name of the file inside 'scripts' folder inside 'rqdir' path, which will be executed (by default) on all nodes
+      files:
+        - '/etc/coros*' # get all files from /etc/coros* wildcard path
+    fuel:
+      logs:
+        include: 'crmd|lrmd|corosync|pacemaker' # only get logs which names match (re.search is used) this regexp
+
+Then you would run ``timmy -l -c my-config.yaml`` to execute timmy with such config.
+
+Instead of setting all structure in a config file you can move actions (cmds, files, filelists, scripts, logs) to an rqfile, and specify ``rqfile`` path in config (although with this example the config-way is more compact). ``rqfile`` structure is a bit different:
+
+::
+
+  cmds: # top-level elements are node parameters, __default will be assigned to all nodes
+    __default:
+      - 01-my-first-command: 'uptime'
+      - 02-disk-check: 'df -h'
+      - and-also-ram: 'free -m'
+  scripts:
+    by_roles: # all non "__default" keys should be matches, "by_<parameter>"
+      controller: 
+        - pacemaker-debug.sh
+  files:
+    by_roles:
+      controller:
+        - '/etc/coros*'
+  logs:
+    by_roles:
+      fuel:
+        include: 'crmd|lrmd|corosync|pacemaker'
+
+Then the config should look like:
+
+::
+
+  rqdir: './pacemaker-debug'
+  rqfile: './pacemaker-rq.yaml'
+  hard_filter:
+    roles:
+      - fuel
+      - controller
+
+And you run ``timmy -l -c my-config.yaml``.
+
 Back to :doc:`Index </index>`.