Configure Additional Cluster Administrators

The ICE ClusterWare™ administrator's command-line tools are found in the clusterware-tools package, which is installed by default on the head node by scyld-install. It can be additionally installed on any system that has HTTP (or HTTPS, see Securing the Cluster) access to a ClusterWare head node in the cluster.

To install these tools on a machine other than the head node, login to that other system, copy /etc/yum.repos.d/clusterware.repo from a head node to the same location on this system, then execute:

sudo yum install clusterware-tools

Once the tools are installed, each administrator must configure a connection to the ClusterWare service, which is controlled by variables in the user's ~/.scyldcw/settings.ini file. The scyld-tool-config tool script is provided by the clusterware-tools package. The contents of the settings.ini file are discussed in the ICE ClusterWare Command Line Tools. Running that tool and answering the on-screen questions will generate a settings.ini file, although administrators of more advanced cluster configurations may need to manually add or edit additional variables.

Once the settings.ini is created, you can test your connection by running a simple node query:

scyld-nodectl ls

This query may complain at this time that no nodes exist or no nodes are selected, although such a complaint does verify that the requesting node can properly communicate with a head node database. However, if you see an error resembling the one below, check your settings.ini contents and your network configuration:

Failed to connect to the ClusterWare service.  Please check that the
service is running and your base_url is set correctly in
/home/adminuser/.scyldcw/settings.ini or on the command line.

The connection URL and username can also be overridden for an individual program execution using the --base-url and --user options available for all scyld-* commands. The settings.ini file generated by scyld-install will contain a blank client.authpass variable. This is provided for convenience during installation, though for production clusters the system administrator will want to enforce authentication restrictions. See details in Securing the Cluster.