yaml.parser.ParserError: while parsing a block mapping

Question

The YAML you provided does not generate an error if the spaces there are indeed spaces. So check your YAML for Tab or other hidden characters.

import ruamel.yaml

yaml_str = """\
version: '2'
services:
  ubuntupgcsstateless:
    image: ubuntupgstatelesscsimage
    environment:
      - EXTERNAL_IP=10.31.86.164
      - EXTERNALDB_IP=10.31.86.165
      - EXTERNALDB_ADMIN_USER=postgres
      - EXTERNALDB_ADMIN_PASSWORD=password
      - DOCBASENAME=DocbaseName
    hostname:
      "ubuntupgcsstateless"
    container_name:
      "ubuntupgcsstateless"
    ports:
     - "1689:1689"
     - "1690:1690"
     - "50000:50000"
     - "50001:50001"
     - "9080:9080"
     - "9082:9082"
    volumes:
     - DocbaseName_data:/home/dmadmin/dctm/data
     - DocbaseName_dba:/home/dmadmin/dctm/dba
     - DocbaseName_share:/home/dmadmin/dctm/share
     - DocbaseName_dfc:/home/dmadmin/dctm/config
     - DocbaseName_xhive_storage:/home/dmadmin/dctm/xhive_storage
     - DocbaseName_mdserver:/home/dmadmin/dctm/wildfly9.0.1/server/DctmServer_MethodServer
    privileged: true
volumes:
 DocbaseName_data:
 DocbaseName_dba:
 DocbaseName_share:
 DocbaseName_dfc:
 DocbaseName_xhive_storage:
 DocbaseName_mdserver:
"""

data = ruamel.yaml.round_trip_load(yaml_str)
print(ruamel.yaml.round_trip_dump(data))

Although not required by the YAML specification, you should consistently indent with the same number of spaces for keys in a mapping (you use 1 and 2 spaces, I recommend two) as well as elements in a sequence (again you use 1 and 2 spaces, I recommend using 0 for sequences that are mapping values).

Try the following with your Dockerfile and docker-compose:

version: '2'
services:
  ubuntupgcsstateless:
    image: ubuntupgstatelesscsimage
    environment:
    - EXTERNAL_IP=10.31.86.164
    - EXTERNALDB_IP=10.31.86.165
    - EXTERNALDB_ADMIN_USER=postgres
    - EXTERNALDB_ADMIN_PASSWORD=password
    - DOCBASENAME=DocbaseName
    hostname:
      "ubuntupgcsstateless"
    container_name:
      "ubuntupgcsstateless"
    ports:
    - "1689:1689"
    - "1690:1690"
    - "50000:50000"
    - "50001:50001"
    - "9080:9080"
    - "9082:9082"
    volumes:
    - DocbaseName_data:/home/dmadmin/dctm/data
    - DocbaseName_dba:/home/dmadmin/dctm/dba
    - DocbaseName_share:/home/dmadmin/dctm/share
    - DocbaseName_dfc:/home/dmadmin/dctm/config
    - DocbaseName_xhive_storage:/home/dmadmin/dctm/xhive_storage
    - DocbaseName_mdserver:/home/dmadmin/dctm/wildfly9.0.1/server/DctmServer_MethodServer
    privileged: true
volumes:
  DocbaseName_data:
  DocbaseName_dba:
  DocbaseName_share:
  DocbaseName_dfc:
  DocbaseName_xhive_storage:
  DocbaseName_mdserver:

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