docker-system: add page (#4310)

pages/common/docker-system.md

@@ -0,0 +1,36 @@
+# docker system
+
+> Manage Docker data and display system-wide information.
+> More information: <https://docs.docker.com/engine/reference/commandline/system/>.
+
+- Show help:
+
+`docker system`
+
+- Show docker disk usage:
+
+`docker system df`
+
+- Show detailed information on disk usage:
+
+`docker system df --verbose`
+
+- Remove unused data:
+
+`docker system prune`
+
+- Remove unused data created more than a specified amount of time in the past:
+
+`docker system prune --filter="until={{hours}}h{{minutes}}m"`
+
+- Display real-time events from the Docker daemon:
+
+`docker system events`
+
+- Display real-time events from containers streamed as valid JSON Lines:
+
+`docker system events --filter 'type=container' --format '{{json .}}'`
+
+- Display system-wide information:
+
+`docker system info`