Fix docker configurations and docker installation guide. (#7827)

* Add Auto option to point radius to make it work as expected since the example using this didn't work because of this (and also as the tooltip says the auto option should be available)

* Remove trailing space

* Fix docker configurations and docker installation guide.
- Fix installation guide regarding passing enviromental variable to docker-compose.
- Add gevent installation command in Dockerfile. (Didn't add it in requirements because it's not really a requirement for the whole project)
- Add user: root:root to allow superset service to work in development mode. Since access to binded superset directory to local requires root user.
- Also add localhost to postgres and redis services to reduce unintended security risk.

* Fix docker configurations and docker installation guide.
- Fix installation guide regarding passing enviromental variable to docker-compose.
- Add gevent installation command in Dockerfile. (Didn't add it in requirements because it's not really a requirement for the whole project)
- Add user: root:root to allow superset service to work in development mode. Since access to binded superset directory to local requires root user.
- Also add localhost to postgres and redis services to reduce unintended security risk.

contrib/docker/Dockerfile

@@ -50,6 +50,8 @@ RUN pip install --upgrade setuptools pip \
     && pip install -r requirements.txt -r requirements-dev.txt \
     && rm -rf /root/.cache/pip
 
+RUN pip install gevent
+
 COPY --chown=superset:superset superset superset
 
 ENV PATH=/home/superset/superset/bin:$PATH \

contrib/docker/README.md

@@ -26,7 +26,7 @@ Docker is an easy way to get stated with Superset.
 To initialize the database with a user and example charts, dashboards and datasets run:
 
 ```bash
-SUPERSET_LOAD_EXAMPLES=yes docker-compose run --rm superset ./docker-init.sh
+docker-compose run -e SUPERSET_LOAD_EXAMPLES=yes --rm superset ./docker-init.sh
 ```
 
 This may take a minute.

contrib/docker/docker-compose.yml

@@ -20,7 +20,7 @@ services:
     image: redis:3.2
     restart: unless-stopped
     ports:
-      - 6379:6379
+      - "127.0.0.1:6379:6379"
     volumes:
       - redis:/data
 
@@ -32,7 +32,7 @@ services:
       POSTGRES_PASSWORD: superset
       POSTGRES_USER: superset
     ports:
-      - 5432:5432
+      - "127.0.0.1:5432:5432"
     volumes:
       - postgres:/var/lib/postgresql/data
 
@@ -52,6 +52,7 @@ services:
       # If using production, comment development volume below
       #SUPERSET_ENV: production
       SUPERSET_ENV: development
+    user: root:root
     ports:
       - 8088:8088
     depends_on: