cannot configure HDFS address using gethue/hue docker image

Question

I'm trying to get the Hue docker image from gethue/hue, but it seems to ignore the configuration I give him and always look for HDFS on localhost instead of the docker container I ask him to look for.

Here is some context:

I'm using the following docker compose to launch a HDFS cluster:

 hdfs-namenode:
    image: bde2020/hadoop-namenode:1.1.0-hadoop2.7.1-java8
    hostname: namenode
    environment:
      - CLUSTER_NAME=davidov
    ports:
      - "8020:8020"
      - "50070:50070"
    volumes:
      - ./data/hdfs/namenode:/hadoop/dfs/name
    env_file:
      - ./hadoop.env


  hdfs-datanode1:
    image: bde2020/hadoop-datanode:1.1.0-hadoop2.7.1-java8
    depends_on:
      - hdfs-namenode
    links:
      - hdfs-namenode:namenode
    volumes:
      - ./data/hdfs/datanode1:/hadoop/dfs/data
    env_file:
      - ./hadoop.env

This launches images from BigDataEurope, which are already properly configured, including:

- the activation of webhdfs (in /etc/hadoop/hdfs-site.xml):
  - dfs.webhdfs.enabled set to true
- the hue proxy user (in /etc/hadoop/core-site.xml): 
  - hadoop.proxyuser.hue.hosts set to *
  - hadoop.proxyuser.hue.groups set to *

The, I launch hue following their instructions:

First, I launch a bash prompt inside the docker container:

docker run -it -p 8888:8888 gethue/hue:latest bash

Then, I modify desktop/conf/pseudo-distributed.ini to point to the correct hadoop "node" (in my case a docker container with the address 172.30.0.2:

[hadoop]

  # Configuration for HDFS NameNode
  # ------------------------------------------------------------------------
  [[hdfs_clusters]]
    # HA support by using HttpFs

    [[[default]]]
      # Enter the filesystem uri
      fs_defaultfs=hdfs://172.30.0.2:8020

      # NameNode logical name.
      ## logical_name=

      # Use WebHdfs/HttpFs as the communication mechanism.
      # Domain should be the NameNode or HttpFs host.
      # Default port is 14000 for HttpFs.
      ## webhdfs_url=http://172.30.0.2:50070/webhdfs/v1

      # Change this if your HDFS cluster is Kerberos-secured
      ## security_enabled=false

      # In secure mode (HTTPS), if SSL certificates from YARN Rest APIs
      # have to be verified against certificate authority
      ## ssl_cert_ca_verify=True

And then I launch hue using the following command (still inside the hue container):

./build/env/bin/hue runserver_plus 0.0.0.0:8888

I then point my browser to localhost:8888, create a new user ('hdfs' in my case), and launch the HDFS file browser module. I then get the following error message:

Cannot access: /user/hdfs/.
HTTPConnectionPool(host='localhost', port=50070): Max retries exceeded with url: /webhdfs/v1/user/hdfs?op=GETFILESTATUS&user.name=hue&doas=hdfs (Caused by NewConnectionError(': Failed to establish a new connection: [Errno 99] Cannot assign requested address',))

The interesting bit is that it still tries to connect to localhost (which of course cannot work), even though I modified its config file to point to 172.30.0.2.

Googling the issue, I found another config file: desktop/conf.dist/hue.ini. I tried modifying this one and launching hue again, but same result.

Does any one know how I could correctly configure hue in my case?

Thanks in advance for your help.

Regards,

Laurent.

OneCricketeer OneCricketeer · Accepted Answer · 2018-02-17T22:13:48

Your one-off docker run command is not on the same network as the docker-compose containers.

You would need something like this, replacing [projectname] with the folder you started docker-compose up in

docker run -ti -p 8888:8888 --network="[projectname]_default" gethue/hue bash

I would suggest using Docker Compose also for the Hue container and volume mount for a INI files under desktop/conf/ that you can specify simply

fs_defaultfs=hdfs://namenode:8020

(since you put hostname: namenode in the compose file)

You'll also need to uncomment the WebHDFS line for your changes to take affect

All INI files are merged in the conf folder for Hue

cannot configure HDFS address using gethue/hue docker image

1 Answers