修改ranger ui的admin用户登录密码踩坑小记

修改的ranger ui的admin用户登录密码时，需要在ranger的配置里把admin_password改成一样的，否则hdfs的namenode在使用admin时启动不起来,异常如下:

Traceback (most recent call last):
  File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/namenode.py", line 317, in 
    NameNode().execute()
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/script/script.py", line 216, in execute
    method(env)
  File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/namenode.py", line 82, in start
    namenode(action="start", rolling_restart=rolling_restart, env=env)
  File "/usr/lib/python2.6/site-packages/ambari_commons/os_family_impl.py", line 89, in thunk
    return fn(*args, **kwargs)
  File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/hdfs_namenode.py", line 50, in namenode
    setup_ranger_hdfs(rolling_upgrade = rolling_restart)
  File "/var/lib/ambari-agent/cache/common-services/HDFS/2.1.0.2.0/package/scripts/setup_ranger_hdfs.py", line 51, in setup_ranger_hdfs
    hdp_version_override = hdp_version)
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/functions/setup_ranger_plugin_xml.py", line 78, in setup_ranger_plugin
    policy_user)
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/functions/ranger_functions.py", line 87, in create_ranger_repository
    ambari_ranger_admin, ambari_ranger_password = self.create_ambari_admin_user(ambari_ranger_admin, ambari_ranger_password, format("{admin_uname}:{admin_password}"))
  File "/usr/lib/python2.6/site-packages/resource_management/libraries/functions/ranger_functions.py", line 277, in create_ambari_admin_user
    response = json.loads(result.read())
  File "/usr/lib/python2.6/site-packages/ambari_simplejson/__init__.py", line 307, in loads
    return _default_decoder.decode(s)
  File "/usr/lib/python2.6/site-packages/ambari_simplejson/decoder.py", line 335, in decode
    obj, end = self.raw_decode(s, idx=_w(s, 0).end())
  File "/usr/lib/python2.6/site-packages/ambari_simplejson/decoder.py", line 353, in raw_decode
    raise ValueError("No JSON object could be decoded")
ValueError: No JSON object could be decoded

修改界面: