Agent-based health checks
In the previous section, we have learned about agent-less health checks. That is, checking the health of our Solr server remotely. Here in this section, we will learn about agent based health checks.
Agent based health is defined as the check which can be performed locally and is advanced in nature compared to the agent-less check.
We can even run checks over Nagios Remote Plugin Executor (NRPE), which might operate at operating system level and could include:
Memory unitization
Disk utilization
CPU load
Active Java servlet container process
JMX checks such as heap memory, custom MBeans and so on.
Exception logs
Age of a file
The Solr wiki describes how to configure the JMX support, http://wiki.apache.org/solr/SolrJmx.
We will see in detail a few of the agent based monitoring tools such as Opsview, New Relic, and SPM in the Monitoring tools section, which is the last section of the chapter.
