add container_elk notes

active/container_elk/elk.md

@@ -0,0 +1,14 @@
+# Elk Stack
+
+## Install
+
+<https://www.elastic.co/blog/getting-started-with-the-elastic-stack-and-docker-compose>
+
+```bash
+# Copy over the files
+scp -rp active/container_elk/. elk:elk
+# SSH into the host
+ssh -t elk "cd elk ; bash --login"
+# Run the services
+docker compose -f elk-compose.yaml up
+```