JON agent will not start if previous instance was not shutdown gracefully and new process is running using its old PID

Solution Unverified - Updated -

Issue

  • Remnant pid files can cause start scripts to exit prematurely
  • The agent startup checks for the presence of a PID file
  • The agent startup checks if a process with a PID exists
  • The agent will not start
  • Start script will not execute if process is already running

Environment

  • Red Hat JBoss Operations Network (ON) 3.1
  • Red Hat Enterprise Linux (RHEL) 5, 6
  • Starting JBoss ON agent as a service -- for example rhq-agent-wrapper.sh start
  • Agent process had previously been running
  • Agent process is not currently running
  • Existing rhq-agent.pid file exists in the agent's bin directory or in /var/run
  • Previously running agent crashed or was not shutdown correctly
  • An unrelated process, using the same process id as the one stored in the agent's pid file, is running

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