HP XC System Software Administration Guide Version 3.2

# cexec -a "who --count"
n12: root bg rmk
n12: # users=3
n25: root wra guest spg
n25: # users=4
For additional information, see cexec(1).
1.4 Configuration and Management Database
The HP XC system stores information about the nodes and system configuration in the
configuration and management database (CMDB). This is a MySQL database that runs on the
node with the node management role. The CMDB is constructed during HP XC system installation.
It contains data on hardware and software configuration and on the connectivity of the system.
The configuration parameters stored in the CMDB include:
• Node names
• Server types
• Memory
• Processors
• MAC addresses
• IP addresses
• Switch ports
• Services
• Roles
• Metrics
The following custom management tools access the data stored in the CMDB:
• The shownode command searches the database and displays a list of services defined for
a given parameter.
• The dbsysparams command searches the database and displays the value of the given
attribute.
• The managedb command enables you to archive metrics data from the CMDB, back it up,
and dump (display) the CMDB data.
Additionally, you can interrogate the CMDB and modify parameters.
Although it is possible to access the CMDB with mysql, the MySQL interactive client, this practice
is discouraged.
Chapter 6: Managing the Configuration and Management Database (page 81) describes the tasks
that are performed in conjunction with the CMDB.
1.5 HP XC Configuration File Guidelines
Configuration files tune the structure and the operation of the HP XC System Software. Some of
these files configure Linux; some configure a third-party application, such as SLURM or Nagios;
and some apply specifically to the HP XC System Software.
While you can modify some configuration files to solve a site-specific issue, do not change other
configuration files so that the integrity of the HP XC System Software is maintained.
Typically, configuration files are modified during reconfiguration, that is, when the
cluster_config utility is run, or during an rpm upgrade operation.
This section describes how modifications to configuration files are treated during reconfiguration
and upgrade operations.
1.5.1 Linux Configuration Files
Linux configuration files pertain to the configuration of the operating system.
38 HP XC Administration Environment