Enabling verbose logs for an AppDynamics machine or database agents can be invaluable for troubleshooting connectivity or network issues.
Luckily, this is easily done by editing the conf/logging/log4j.xml file. By default, only the error level messages are sent to the logs:
But you can modify this so that debug level is sent:
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As an exploration of AppDynamics’ APM functionality, you may find it useful to deploy a sample application that can quickly return back useful data. The Java Spring PetClinic connecting back to a PostgreSQL database provides a simple code base that exercises both database and application monitoring.
In a previous article, I went over the detailed steps for monitoring PetClinic with a MySQL backend, so I will refer back to that article for some of the details and will focus on the PostgreSQL specific steps here.
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As an exploration of AppDynamics’ APM functionality, you may find it useful to deploy a sample application that can quickly return back useful data. The Java Spring PetClinic connecting back to a MySQL database provides a simple code base that exercises both database and application monitoring.
We’ll deploy the Java Spring PetClinic unto Tomcat running on Ubuntu 14.04. MySQL will be the backing persistence engine for the web application. The AppDynamics Java agent will be loaded into the JVM running Tomcat, and the AppDynamics Database Agent will connect to MySQL for metrics gathering.
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The AppDynamics Machine Agent is used not only to report back on basic hardware metrics (cpu/memory/disk/network), but also as the hook for custom plugins that can report back on any number of applications including: .NET, Apache, AWS, MongoDB, Cassandra, and many others.
In this article, I’ll go over the details to install the Machine Agent unto an Ubuntu 14.04 system.
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For full instructions on installing the AppDynamics Controller on Linux, see the official documentation. However, when you get to the step for installing in silent mode, it can be confusing because although it shows you how to specify the path to a response file and the keys available, it does not give you a sample file.
./controller_64bit_linux.sh -q -c -varfile /home/user/response.varfile
One way to generate a sample file that matches the responses you want in production is to manually install the controller in a development environment first. If you run the installer:
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