docker.userguide: Add --network=host option for manual docker build examples

On Ubuntu hosts (16.04 & 18.04) there might be problem to build
docker collectd container if host is behind a proxy even if
proxy variables are set correctly - when using "--network=host"
option problem is resolved.
This option has no negative impact on other host systems so adding
it to default command line build example.

Change-Id: I69ebd13f1e05658d8ad18e3ec379f515312e7b74
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 4947ec7..6f25164 100644 (file)
--- a/docs/release/userguide/docker.userguide.rst
+++ b/docs/release/userguide/docker.userguide.rst
@@ -572,7 +572,7 @@ Build the collectd docker image
     $ git clone https://gerrit.opnfv.org/gerrit/barometer
     $ cd barometer/docker/barometer-collectd
     $ sudo docker build -t opnfv/barometer-collectd --build-arg http_proxy=`echo $http_proxy` \
-      --build-arg https_proxy=`echo $https_proxy` -f Dockerfile .
+      --build-arg https_proxy=`echo $https_proxy` --network=host -f Dockerfile .
 
 .. note::
    Main directory of barometer source code (directory that contains 'docker',
@@ -702,7 +702,7 @@ Build influxdb image from Dockerfile
 
   $ cd barometer/docker/barometer-influxdb
   $ sudo docker build -t opnfv/barometer-influxdb --build-arg http_proxy=`echo $http_proxy` \
-    --build-arg https_proxy=`echo $https_proxy` -f Dockerfile .
+    --build-arg https_proxy=`echo $https_proxy` --network=host -f Dockerfile .
 
 .. note::
    In the above mentioned ``docker build`` command, http_proxy & https_proxy arguments needs to