Data aggregator down and activemq.log shows "Address already in use"

Products

• CA Performance Management
• Network Observability

Issue/Introduction

Data aggregator down. The dadaemon service will start but the activemq service gets the following :
[appadmin@<DAHostName> <userName> <userName>]$ sudo service activemq status
Redirecting to /bin/systemctl status activemq.service
● activemq.service - Apache ActiveMQ
   Loaded: loaded (/etc/systemd/system/activemq.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since Tue 2020-06-16 15:47:24 PDT; 3min 12s ago
  Process: 9182 ExecStop=/data01/ca/IMDataAggregator/scripts/activemq stop sysd (code=exited, status=1/FAILURE)
  Process: 9034 ExecStart=/data01/ca/IMDataAggregator/scripts/activemq start sysd (code=exited, status=0/SUCCESS)
 Main PID: 9116 (code=exited, status=1/FAILURE)

Jun 16 15:47:24 <DAHostName> activemq[9182]: Shutting down ActiveMQ
Jun 16 15:47:24 <DAHostName> runuser[9187]: pam_unix(runuser:session): session opened for user appadmin by (uid=0)
Jun 16 15:47:24 <DAHostName> activemq[9182]: INFO: Loading '/data01/ca/IMDataAggregator/broker/apache-activemq-5.15.8//bin/env'
Jun 16 15:47:24 <DAHostName> activemq[9182]: INFO: Using java '/data01/ca/IMDataAggregator/jre/bin/java'
Jun 16 15:47:24 <DAHostName> activemq[9182]: ERROR: No or outdated process id in '/data01/ca/IMDataAggregator/broker/apache-activemq-5.15.8//data/activemq.pid'
Jun 16 15:47:24 <DAHostName> activemq[9182]: INFO: Removing /data01/ca/IMDataAggregator/broker/apache-activemq-5.15.8//data/activemq.pid
Jun 16 15:47:24 <DAHostName> runuser[9187]: pam_unix(runuser:session): session closed for user appadmin
Jun 16 15:47:24 <DAHostName> systemd[1]: activemq.service: control process exited, code=exited status=1
Jun 16 15:47:24 <DAHostName> systemd[1]: Unit activemq.service entered failed state.
Jun 16 15:47:24 <DAHostName> systemd[1]: activemq.service failed.

Activemq.log  had the error:

BindException: Address already in use

activemq does not start 

Environment

Dx NetOps Performance Management any version

Resolution

The following link will show default ports for the DA

DA Ports

Needed to restart the Linux system to free up the port.