Add check for Docker

diff --git a/programming/python/scraping_with_selenium_on_docker.md b/programming/python/scraping_with_selenium_on_docker.md
index 0a583a6da398c43c7fab3448555e2ccbb3c95f9d..32bf39d5063efdd5b5a4aff7bceb32dcccf7a414 100644 (file)
--- a/programming/python/scraping_with_selenium_on_docker.md
+++ b/programming/python/scraping_with_selenium_on_docker.md
@@ -1,3 +1,11 @@
+Check that Docker is installed and your user can run Docker:
+
+```
+$ docker run --rm hello-world
+```
+
+Docker should print a success message, if not, review your Docker installation.
+
 Create a virtualenv and install `testcontainers` with `selenium` support:
 
 ```