Improved xds docker image installation instructions

- Add warning section about the fact that user must be part of
docker group
- Add warning section about impact of changing container id on
xds-server port

Bug: SPEC-2032

Change-Id: I3a8e50c079af9f99a99a0fc02afcd55e7bc83b38
Signed-off-by: Sebastien Douheret <sebastien.douheret@iot.bzh>

1 files changed, 46 insertions, 2 deletions

diff --git a/docs/part-1/1-1_install-xds-server-docker.md b/docs/part-1/1-1_install-xds-server-docker.md
index 715bfec..d5975ae 100644
--- a/docs/part-1/1-1_install-xds-server-docker.md
+++ b/docs/part-1/1-1_install-xds-server-docker.md
@@ -4,6 +4,26 @@
 
 Docker is installed on the host machine, please refer to [Docker documentation](https://docs.docker.com/engine/installation/) for more details.
 
+<!-- section-warning -->
+>**Warning:**
+>
+>Your user must be part of docker group. You can use following command to check it :
+>```bash
+>groups | grep docker
+>```
+>
+>If not, please refer to [docker post install instructions](https://docs.docker.com/install/linux/linux-postinstall/).
+>
+>Here are a short recap of commands you must execute :
+>
+>```bash
+>sudo groupadd docker
+>sudo usermod -aG docker $USER
+># Log out and log back in so that your group membership is re-evaluated
+>```
+>
+<!-- end-section-warning -->
+
 ## Get the container
 
 Load the pre-build AGL SDK docker image including `xds-server`:
@@ -72,13 +92,37 @@ You can change docker used port with `-id` option
 
 ```bash
 # Create new XDS worker container with a different port number
+ID=3
 bash ./xds-docker-create-container.sh -id ${ID}
 
-# Check that new container is running
+# Check that new container is running (in example below id has been set to 3)
 docker ps | grep worker-xds
-f67079db4339        docker.automotivelinux.org/agl/worker-xds:5.0   "/usr/bin/wait_for..."   About a minute ago   Up 34 seconds       0.0.0.0:(2222+ID)->22/tcp, 0.0.0.0:(8000+ID)->8000/tcp, 0.0.0.0:(10809+ID)->10809/tcp   agl-xds-HOSTNAME-ID-USERNAME
+f67079db4339        docker.automotivelinux.org/agl/worker-xds:5.0   "/usr/bin/wait_for..."   About a minute ago   Up 34 seconds       0.0.0.0:2225->22/tcp, 0.0.0.0:8003->8000/tcp, 0.0.0.0:10892->10809/tcp   agl-xds-3
 ```
 
+<!-- section-warning -->
+>**Warning:**
+> Changing container id will impact the port number used to connect to xds-server.
+> So you may need to adjust xds-agent config in order to match the right port number.
+>
+>In above example, with `id` set to 3, the export port number will be `8003` and >consequently
+>you must define xds-server `url` in `xds-agent` configuration as follow:
+>
+>```json
+>{
+>    ...
+>    "xdsServers": [
+>      {
+>        "url": "http://localhost:8003"
+>      }
+>    ],
+>    ...
+>}
+>```
+>
+>See also [xds-agent configuration](../part-2/1_xds-agent/1_config.html) chapter for >more details.
+<!-- end-section-warning -->
+
 ### Manually setup docker user id
 
 <!-- section-note -->