Starting, stopping, and restarting OpsCenter

Commands for starting, stopping, and restarting OpsCenter for each type of installation.

Procedure

Package installs
- The available service opscenterd options are:
```
sudo service opscenterd start|stop|status|restart|force-reload
```
- Packaged installations include startup scripts in the /etc/init.d directory for running OpsCenter as a service.
  For example, the following script starts OpsCenter on the node where the command runs.
```
sudo /etc/init.d/opscenterd start
```
Tarball installs
Starting opscenterd:

Use the -f option to start the agent in the foreground.
```
install_location/bin/opscenter
```
Stopping and restarting opscenterd:
1. To stop OpsCenter, find the opscenterd process ID (pid) and kill the process using its PID number:
```
ps -ef | grep opscenter
```
```
sudo kill pid
```
2. To start OpsCenter:
  Use the -f option to start the agent in the foreground.
```
install_location/bin/opscenter
```