spark的配置问题，启动不了

在sbin下启动 ./start-all.sh 出现如下错误
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starting org.apache.spark.deploy.master.Master, logging to /usr/local/spark/spark-1.6.1-bin-hadoop2.6/logs/spark-root-org.apache.spark.deploy.master.Master-1-ubuntu.out
master: ssh: Could not resolve hostname master: Name or service not known_**
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望哪位大神给解疑