sbt-yourkit
Adds YourKit agent to Java packages built using sbt-native-packager.
The plugin adds the YourKit shared library for a target platform into the package built by sbt-native-packager, and adds the library as an agent at startup.
The YourKit Java Profiler is a profiling tool for memory, CPU, threads, exceptions, and other aspects of your Java VM. See https://www.yourkit.com/features/ for more details.
Usage
- Add the following to your project build, e.g.
project/plugins.sbt:
addSbtPlugin("com.gilt.sbt" % "sbt-yourkit" % "0.0.3")- Add the
YourKitplugin to your project, e.g.:
enablePlugins(YourKit)Customization
Two SBT keys are intended to be customized for your purposes:
| Key name | Purpose | Default value |
|---|---|---|
| yourKitAgentPlatforms | Shared object target platform | Seq("linux-x86-64") |
| yourKitAgentStartupOptions | Startup options for YourKit | sessionname=${project_name}, |
The startup options for the YourKit agent are described at https://www.yourkit.com/docs/80/help/startup_options.jsp
Overriding at runtime
You can override the behaviour of your packaged application at runtime by setting some environment variables.
| Environment variable | Purpose |
|---|---|
| YOURKIT_AGENT_DISABLED | If set (to any value), completely disable the agent |
| YOURKIT_AGENT_STARTUP_OPTIONS | If set, overrides startup options provided to agent |
Requirements
The plugin requires SBT >= 0.13.5 (as it is an SBT AutoPlugin). It also requires Java 7+.
Your project should use sbt-native-packager >= 1.0.0
for packaging, and use the JavaAppPackaging AutoPlugin (or some plugin that in turn
depends on this). This is standard for packaged applications which run on the Java VM.
Security Note
The YourKit agent opens a TCP port which allows access to the profiling options available in the VM. This should be secured from access by arbitrary people:
-
You can place the running service in a network with appropriate network restrictions, so that only allowed machines can connect to the service.
-
You can add flags to limit the network interfaces on which the agent listens, see some possible options at https://www.yourkit.com/docs/80/help/startup_options.jsp In particular, the
onlylocaloption allows connections only from the local machine.
Limitations
While it would be nice to include support for multiple platforms in the archive, and then choose between them at runtime, this requires some runtime checks in the start script. This is possible, but error-prone without access to the appropriate systems for testing.
