Installation guide

Integration of Cluster Status and Logs
Fine-Grained Control over User Permissions
The primary components in Conga are luci and ricci, which are separately installable. luci is a server
that runs on one computer and communicates with multiple clusters and computers via ricci. ricci is an
agent that runs on each computer (either a cluster member or a standalone computer) managed by
Conga.
luci is accessible through a Web browser and provides three major functions that are accessible
through the following tabs:
homebase — Provides tools for adding and deleting computers, adding and deleting users, and
configuring user privileges. Only a system administrator is allowed to access this tab.
cluster — Provides tools for creating and configuring clusters. Each instance of luci lists clusters
that have been set up with that luci. A system administrator can administer all clusters listed on this
tab. Other users can administer only clusters that the user has permission to manage (granted by an
administrator).
st orage — Provides tools for remote administration of storage. With the tools on this tab, you can
manage storage on computers whether they belong to a cluster or not.
To administer a cluster or storage, an administrator adds (or registers) a cluster or a computer to a luci
server. When a cluster or a computer is registered with luci, the FQDN hostname or IP address of each
computer is stored in a luci database.
You can populate the database of one luci instance from another luciinstance. That capability provides
a means of replicating a luci server instance and provides an efficient upgrade and testing path. When
you install an instance of luci, its database is empty. However, you can import part or all of a luci
database from an existing luci server when deploying a new luci server.
Each luci instance has one user at initial installation — admin. Only the admin user may add systems to
a luci server. Also, the admin user can create additional user accounts and determine which users are
allowed to access clusters and computers registered in the luci database. It is possible to import users
as a batch operation in a new luci server, just as it is possible to import clusters and computers.
When a computer is added to a luci server to be administered, authentication is done once. No
authentication is necessary from then on (unless the certificate used is revoked by a CA). After that, you
can remotely configure and manage clusters and storage through the luci user interface. luci and ricci
communicate with each other via XML.
The following figures show sample displays of the three major luci tabs: homebase, cluster, and
st orage.
For more information about Conga, refer to Chapter 3, Configuring Red Hat Cluster With Conga,
Chapter 4, Managing Red Hat Cluster With Conga, and the online help available with the luci server.
Chapter 1. Red Hat Cluster Configuration and Management Overview
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