docker.userguide: Add a note about bar-collectd run without DPDK/RDT

Added a note with information what happens if RDT/DPDK dependency
will be missing on host during manual starting bar-collectd
container(with info what should be done in such scenario
to start bar-collectd anyway)

Change-Id: I11ba595e8925027c772920876c4bf2967f33de88
Signed-off-by: Radoslaw Jablonski <radoslawx.jablonski@intel.com>

diff --git a/docs/release/userguide/docker.userguide.rst b/docs/release/userguide/docker.userguide.rst
index ec85655..15acf38 100644 (file)
--- a/docs/release/userguide/docker.userguide.rst
+++ b/docs/release/userguide/docker.userguide.rst
@@ -614,11 +614,28 @@ Run the collectd docker image
    plugins. In the command above we are overriding
    /opt/collectd/etc/collectd.conf.d by mounting a host directory
    src/collectd/collectd_sample_configs that contains only the sample
-   configurations we are interested in running. *It's important to do
-   this if you don't have DPDK, or RDT installed on the host*.
+   configurations we are interested in running.
+
+   *If some dependencies for plugins listed in configuration directory
+   aren't met, then collectd startup may fail(collectd tries to
+   initialize plugins configurations for all given config files that can
+   be found in shared configs directory and may fail if some dependency
+   is missing).*
+
+   If `DPDK` or `RDT` can't be installed on host, then corresponding config
+   files should be removed from shared configuration directory
+   (`<BAROMETER_REPO_DIR>/src/collectd/collectd_sample_configs/`) prior
+   to starting barometer-collectd container. By example: in case of missing
+   `DPDK` functionality on the host, `dpdkstat.conf` and `dpdkevents.conf`
+   should be removed.
+
    Sample configurations can be found at:
    https://github.com/opnfv/barometer/tree/master/src/collectd/collectd_sample_configs
 
+   List of barometer-collectd dependencies on host for various plugins
+   can be found at:
+   https://wiki.opnfv.org/display/fastpath/Barometer-collectd+host+dependencies
+
 Check your docker image is running
 
 .. code:: bash