Apache spark can'；t使用spark-ec2在aws上创建spark群集：每30秒重试一次错误

我使用的命令（指定的vpc id、子网id和专用IP:

./spark-ec2 -k jetflix-spark -i 
/home/ec2-user/jetflix-spark.pem  -s 1 -t m1.small 
-r us-east-1 -z us-east-1a --vpc-id=vpc-0034d4c0cd6f53f83 
--subnet-id=subnet-0eadaf5cc190d3d65 --private-ips  launch my_cluster

它开始创建节点。但出现以下错误：

Error executing remote command, retrying after 30 seconds: Command '['ssh', '-o' 
  , 'StrictHostKeyChecking=no', '-o', 'UserKnownHostsFile=/dev/null', '-i', '/home/ec2-user/jetflix-spark.pem', '-t', '-t', u'root@10.0.0.87', 'rm -rf spark-ec2 &  
      & git clone https://github.com/amplab/spark-ec2 -b branch-2.0 spark-ec2']' returned non-zero exit status 128
Warning: Permanently added '10.0.0.87' (RSA) to the list of known hosts.
Cloning into 'spark-ec2'...
error: Failed connect to github.com:443; Connection timed out while accessing https://github.com/amplab/spark-ec2/info/refs?service=git-upload-pack
fatal: HTTP request failed
Connection to 10.0.0.87 closed.