initial

README.md

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+# entrypoint.sh
+## A basic template for docker entrypoint shell scripts

entrypoint.sh

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+#!/bin/sh
+set -e
+
+trap "echo Exiting...; exit 0" EXIT TERM
+
+STARTUP_COMMAND="java Xmx2G -jar app.jar"  # Command that you specified in your Dockerfile as 'CMD' 
+BASE_DIR="/app"  # Base Direcotry of your containerized app
+
+if [[ "$*" == "$STARTUP_COMMAND" ]]; then
+
+  if ! [ -d "$BASE_DIR" ]; then
+    echo "Error: $BASE_DIR is missing. Exiting..."
+    exit 1
+  fi
+
+  cd "$BASE_DIR"
+
+  echo "Starting app..."
+  
+  exec "$@"
+fi
+
+exec "$@"