This page explains how to manage and operate a Hue installation:
Hue Superusers and Users
The Hue User Admin application provides two levels of privileges: superusers and users.
- Superusers — The first user who logs into Hue after its installation becomes the first superuser. Superusers can perform administrative functions such as:
- Add and delete users
- Add and delete groups
- Assign permissions to groups
- Change a user to a superuser
- Import users and groups from an LDAP server
Users — Can change their name, email address, and password. They can login to Hue and run Hue applications according to their group permissions.
Hue UI Customization
The Hue Web UI has the following customization options in hue.ini under.
login_splash_html=WARNING: You are required to have authorization before you proceed.To configure a splash screen in Cloudera Manager:
- Go to the Hue service.
- Click the Configuration tab.
- Select and .
- Locate Hue Service Advanced Configuration Snippet (Safety Valve) for hue_safety_valve.ini and add your HTML in the text field as follows:
[dekstop] [[custom]] login_splash_html=WARNING: You are required to have authorization before you proceed.
- Click Save Changes to commit the changes.
- Select Close. and, when done, click
- Click Web UI to view your changes.
You enable Hue UI caching by setting a timeout in milliseconds. The default is 86400000 milliseconds or one day. Set the timeout to 0 to disable caching.
[dekstop] [[custom]] cacheable_ttl=86400000
Starting and Stopping the Hue Server
The hue-server package includes service scripts to start and stop the Hue Server.
To start the Hue Server:
$ sudo service hue start
To restart the Hue Server:
$ sudo service hue restart
To stop the Hue Server:
$ sudo service hue stop
Configuring a Firewall for Hue
Hue currently requires that the machines in your cluster connect to each other freely over TCP. The machines outside your cluster must be able to open TCP port 8888 on the Hue Server (or the configured Hue web HTTP port) to interact with the system.
Anonymous Usage Data Collection
Hue tracks anonymized pages and application versions to gather information about application usage levels. The data collected does not include any hostnames or IDs.
For Hue 2.5.0 and higher, you can restrict this data collection by setting the collect_usage property to false in the [desktop] section in the Hue configuration file, hue.ini.
[desktop] ... # Help improve Hue with anonymous usage analytics. # Use Google Analytics to see how many times an application or specific section of an application is used, nothing more. ## collect_usage=false
If you are using an earlier version of Hue, disable this data collection by going to Step 3 of Hue's Quick Start Wizard. Under Anonymous usage analytics, uncheck the box for Check to enable usage analytics.
Managing Hue Processes
The supervisor script manages all Hue processes. The supervisor is a watchdog process; its only purpose is to spawn and monitor other processes. To see active supervised processes, run ps -f -u hue.
A standard Hue installation starts and monitors the runcpserver process, which provides the core web functionality for Hue. If you installed other applications into your Hue instance, you may see other daemons running under the supervisor as well.
Supervisor automatically restarts these processes if they fail for any reason. If they fail repeatedly in a short period of time, the supervisor itself shuts down.
Viewing Hue Logs
Hue logs are stored in /var/log/hue. In the Hue UI, select. You can also view these logs at http://myserver:port/logs.
Hue generates .log and .out files for each supervised process. The .log files write log information with log4j. The .out files write standard output (stdout) and standard error (stderr) streams.
The following Hue logs are available.
|access.log||Filtered list of all successful attempts to access the Hue Web UI|
|audit.log||Audit log visible in Cloudera Navigator|
|error.log||Filtered list of all nontrivial errors|
|kt_renewer.log||Kerberos ticket renews|
|metrics_hue_server.log||Usage data for monitoring in Cloudera Manager|
|migrate.log||Database and table migrations|
|runcpserver.log||Hue (CherryPy) web server info|
|syncdb.log||Database and table creations|
The Hue Server logs INFO level messages and keeps a small buffer of log messages at all levels in memory. The DEBUG level messages can sometimes be helpful in troubleshooting issues.