Update README.md

README.md

@@ -33,7 +33,7 @@ To run your own script (for example to install additional libraries on the worke
 To start the worker correctly, you will need to use this command-line at the end of your script:
 
     /opt/spark/bin/spark-class org.apache.spark.deploy.worker.Worker \
-       spark://${SPARK_MASTER_IP}:7077 --cores ${SPARK_WORKER_CORES} --memory ${SPARK_WORKER_RAM} \
+       spark://${SPARK_MASTER}:7077 --cores ${SPARK_WORKER_CORES} --memory ${SPARK_WORKER_RAM} \
        -h ${SPARK_LOCAL_IP:-127.0.0.1}
 
 ### Master
@@ -42,7 +42,7 @@ To run your own script you can override the default command specified in the JSO
 
 To start the master correctly, you will need to use this command-line at the end of your script:
 
-    ${SPARK_HOME}/bin/spark-class org.apache.spark.deploy.master.Master --host ${SPARK_MASTER_IP} --port 7077 --webui-port 8080
+    ${SPARK_HOME}/bin/spark-class org.apache.spark.deploy.master.Master --host ${SPARK_MASTER} --port 7077 --webui-port 8080
 
 ### Notebook and Spark submit
 
@@ -52,7 +52,7 @@ If you want to run the notebook, at the end of your script call `/opt/start_note
 
 If you want to run spark-submit, you need to use:
 
-    /opt/spark/bin/spark-submit --master spark://${SPARK_MASTER_IP}:7077 <the rest of the options>
+    /opt/spark/bin/spark-submit --master spark://${SPARK_MASTER}:7077 <the rest of the options>
 
 Where the rest of the options could be, for example: