Managing Server Processes Through the Virtuozzo Power Panel

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  • Applies to: Legacy DV & VPS Hosting
    • Difficulty: Easy
    • Time Needed: 10
    • Tools Required: Root access
  • Applies to: DV 4.0
    • Difficulty: Easy
    • Time Needed: 10
    • Tools Required: Root access


This article shows you how to turn on, restart, and turn off services for your DV server. For instructions for the Plesk control panel, use this article:

Start, Stop, or Restart System Services On Your DV

Warning! Altering the run-state of processes may adversely impact many aspects of your hosting! Please proceed with caution.

The information in this article only applies to Legacy DV & VPS Hosting products. This includes: DV w/SSDs (CentOS 7), DV w/SSDs (CentOS 6), DV, DV Developer, & dv 4.0. Be sure to check the service type in your Account Center before continuing with the instructions below:


Managing server processes through the Power Panel is not available for Virtuozzo 7. If you wish to perform these actions, you will want to do them through your control panel or through SSH: Start, Stop, or Restart System Services On Your VPS.

Manage Processes from the Parallels Power Panel

1. Log into your Parallels Power Panel. Visit (or - use your own domain or IP!) in your browser, and log in with your root user.

2. Click on System Processes.


3. Click on the check box to the left of the service you wish to manage. Alternatively, use the PID (Process ID) found in the column to the right of the check box. PowerPanelprocess2.png

4. Select the appropriate option to start, restart, or stop the service(s) you selected. See the Signal Options section for an explanation of various signals. PowerPanelProcess3.png

5. Click on the Send Signal button to execute the command.

Signal Options

Unix signals can be sent to a processes to interrupt the current function of that process. The list below summarizes what each signal will do to a process. Depending on the process, and how it is set up to handle these signals, some signals will do something different than what is listed that is particular to that process's configuration.

SIGHUP - This is the signal used to let a process know that its controlling terminal is closed or its controlling process is terminated.
SIGTERM - This is the generic signal to end a process. This is a signal that can be ignored or otherwise handled by the process.
SIGCONT - This is a signal that instructs a process to resume from a paused state.
SIGSTOP - This is a signal that pauses a running process, to resume at a later time.
SIGINT - This is the generic signal used to immediately interrupt a process. This is very similar to SIGKILL, with the difference that a process can ignore or otherwise handle this signal.
SIGKILL - This is the generic signal to immediately terminate a process. This signal cannot be ignored by the process, and should only be used as a last resort.

Common Running Processes

/usr/sbin/httpd - The Apache process.
/bin/sh /usr/bin/mysqld_safe... - The parent MySQL process.
/usr/libexec/mysqld... - The child MySQL process.
/usr/sbin/sw-cp-serverd - The Plesk Control Panel process.
qmail... - The email system process.
/usr/lib/courier-imap/couriertcpd... - The email system process.
/usr/sbin/courierlogger imapd... - The email system process.
/usr/bin/spamd - The email spam process.
spamd - The email spam process.
/usr/sbin/sshd - The SSH process.


Wikipedia: Unix Signal
GNU Org: Termination Signals
Parallels Power Panel Documentation: Power Panel Users Guide