.UnavailableSocketError: Inet 地址 127.0.0.1:7000 不可​​用

我试图在我的机器上创建一个包含三个 Cassandra 节点的集群。我已经解压缩了 tar.gz 并更改了监听和 rpc_addresses，还有 JMX_PORT。它没有工作

~/apache-cassandra-3.11.1-1/bin$ nodetool -h 127.0.0.02 -p 8081 ring
nodetool: Failed to connect to '127.0.0.02:8081' - ConnectException: 'Connection refused (Connection refused)'.

然后我按照 ALex Ott 的建议，安装了 ccm。然后我又遇到了问题

ccm start
Traceback (most recent call last):
  File "/home/jholmes/anaconda3/lib/python3.6/site-packages/ccm-3.1.3-py3.6.egg/ccmlib/common.py", line 513, in assert_socket_available
OSError: [Errno 98] Address already in use

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/home/jholmes/anaconda3/bin/ccm", line 4, in <module>
    __import__('pkg_resources').run_script('ccm==3.1.3', 'ccm')
  File "/home/jholmes/anaconda3/lib/python3.6/site-packages/pkg_resources/__init__.py", line 750, in run_script
    self.require(requires)[0].run_script(script_name, ns)
  File "/home/jholmes/anaconda3/lib/python3.6/site-packages/pkg_resources/__init__.py", line 1534, in run_script
    exec(script_code, namespace, namespace)
  File "/home/jholmes/anaconda3/lib/python3.6/site-packages/ccm-3.1.3-py3.6.egg/EGG-INFO/scripts/ccm", line 105, in <module>
  File "/home/jholmes/anaconda3/lib/python3.6/site-packages/ccm-3.1.3-py3.6.egg/ccmlib/cmds/cluster_cmds.py", line 490, in run
  File "/home/jholmes/anaconda3/lib/python3.6/site-packages/ccm-3.1.3-py3.6.egg/ccmlib/cluster.py", line 389, in start
  File "/home/jholmes/anaconda3/lib/python3.6/site-packages/ccm-3.1.3-py3.6.egg/ccmlib/common.py", line 519, in assert_socket_available
ccmlib.common.UnavailableSocketError: Inet address 127.0.0.1:7000 is not available: [Errno 98] Address already in use; a cluster may already be running or you may need to add the loopback alias

如何检查地址的可用性？