Follow below steps to understand and resolve the issue:
1) Remove the /var/run/rundeck.pid file in order to delete the zombie process.
rm /var/run/rundeck.pid
2) Check for any other zombie process using lsof commmand.
lsof |grep rundeck
lsof |grep <Port_Number>
3) Reownership the rundeck related folders (Owner should be rundeck)
Chown -R rundeck:rundeck /var/rundeck/
Chown -R rundeck:rundeck /var/lib/rundeck/
Chown -R rundeck:rundeck /var/log/rundeck/
Chown -R rundeck:rundeck /etc/rundeck/
4) Restart the rundeckd service.
service rundeckd restart
5) Hurray!!! its running inside the container well.
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