Cluster Daemon Status - Linux Test

A Linux cluster is a connected array of Linux computers or nodes that work together and can be viewed and managed as a single system. The redundancy of cluster components eliminates single point of failure. Linux clusters may be connected nodes of servers, storage devices or virtualized containers. These clusters when deployed in an IT infrastructure will help reduce downtime as well as deliver highly available IT services and mission-critical workloads. Compared to a single computer, a Linux cluster can provide faster processing speed, larger storage capacity, better data integrity, greater reliability and wider availability of resources. Clusters are usually dedicated to specific functions, such as load balancing, high availability, high performance, storage or large-scale processing.

A daemon is a program that runs in the background without requiring any user interaction. It is activated by the occurrence of a specific event or condition. A daemon supervises the system or provides functionality to other processes. Daemon ensures smooth running of the operating system. When a daemon is not active or is not enabled, then, a few processes could not be started/stopped or user requests could not be processed. This may cause lead to processing lag and also largely affect the functioning of the Linux system. To avoid such processing lag and to ensure the smooth functioning of the Linux system, it is imperative to proactively monitor the status of each daemon on the target Linux cluster. The Cluster Daemon Status - Linux test helps administrators in this regard!

This test auto-discovers the daemons on the target Linux cluster and for each daemon, this test reports the current status. This test also reveals if the daemon is enabled or disabled. Using this test, administrators can identify inactive daemons and initiate troubleshooting well before users complain of issues on the Linux cluster.

This test is disabled by default. To enable the test, go to the enable / disable tests page using the menu sequence : Agents -> Tests -> Enable/Disable, pick the desired Component type, set Performance as the Test type, choose the test from the DISABLED TESTS list, and click on the << button to move the test to the ENABLED TESTS list. Finally, click the Update button.

Target of the test : A Linux cluster

Agent deploying the test : An internal agent

Outputs of the test : One set of results for each daemon executing on the target Linux cluster being monitored.

Job Name	Description
Test Period	How often should the test be executed
Host	The host for which the test is to be configured.
Port	The port at which the specified host listens. By default, this is Null.
Report by Owner Node Only	If this flag is set to Yes, then, this test will report metrics only for the owner node and not for the other nodes in the cluster. On the other hand, if the flag is set to No, then, it indicates that the test will report metrics for all the nodes in the cluster. By default, this flag is set to No.
Use SUDO	By default, this flag is set to Yes, indicating that the test uses sudo command to collect the daemon-related metrics. If this flag is set to No, then the test will not collect the metrics using sudo command.
SUDO Path	This parameter is relevant only when the Use SUDO parameter is set to Yes. By default, the SUDO Path is set to none. This implies that the sudo command is in its default location - i.e., in the /usr/bin or /usr/sbin folder of the target host. In this case, once the Use SUDO flag is set to Yes, the eG agent automatically runs the sudo command from its default location to allow access to the daemon process. However, if the sudo command is available in a different location in your environment, you will have to explicitly specify the full path to the sudo command in this text box to enable the eG agent to run the sudo command.
DD Frequency	Refers to the frequency with which detailed diagnosis measures are to be generated for this test. The default is 1:1. This indicates that, by default, detailed measures will be generated every time this test runs, and also every time the test detects a problem. You can modify this frequency, if you so desire. Also, if you intend to disable the detailed diagnosis capability for this test, you can do so by specifying none against DD frequency.

Measurements made by the test

Measurement	Description	Measurement Unit	Interpretation
Active	Indicates the current status of this daemon.		The values that this measure can report and their corresponding numeric values are listed in the table below: Measure Value Numeric Value Active 100 Inactive 0 Note: By default, this measure can report the Measure values mentioned above while indicating the current status of the daemon. However, the graph of this measure is indicated using the numeric equivalents i.e., 0 or 100.
Enabled	Indicates whether this daemon is enabled or not.		The values that this measure can report and their corresponding numeric values are listed in the table below: Measure Value Numeric Value Enabled 100 Disabled 0 Note: By default, this measure can report the Measure values mentioned above while indicating whether the daemon is enabled or not. However, the graph of this measure is indicated using the numeric equivalents i.e., 0 or 100.