User`s guide

Managing Services and Processes 132
Changing Services Mode
xinetd is a service used to start and stop a variety of data communication services. xinetd
starts on the Parallels server startup and waits for a connection request from a remote client that
wants to connect to the server. There can be a number of remote clients in the network, and each
of them can use different network protocols to establish connection to the server. In order not to
run all network services responsible for a specific protocol, which will negatively influence the
system performance, the system starts only the xinetd service. This service controls all other
network services and, at the connection time, it starts the corresponding service to process this
connection. In such a way, xinetd saves system resources allowing you to run only those
network services in the system that are really needed at the moment.
The vzsetxinetd utility allows you to switch Container services between the standalone and
xinetd mode. The services that can be either standalone or dependent on xinetd are
sendmail, sshd, proftpd, and courier-imap. Whereas they are xinetd-dependent
by default, in order to consume less resources, you may want to make them standalone due to
the following reasons:
 The CPanel application does not recognize sshd if it is dependent on xinetd;
 sendmail does not process some rules correctly if it is dependent on xinetd;
 A number of control panel applications and some others are not able to manage xinetd-
based services at all.
The courier-imapd, courier-imapds, courier-pop3d, and courier-pop3ds
services are provided by the courier-imap service, thus vzsetxinetd can manage these
services via the courier-imap service.
Let us assume that you wish to check the mode of the sendmail service and set it to
standalone if it is in the xinetd mode. First, you should check the current status of the
sendmail service. To this effect, type the following command in the command line:
# vzsetxinetd -s 222 sendmail
where 222 is the Container ID, sendmail denotes the name of the corresponding service, and
the -s option gets the status of the sendmail service of the Container with ID 222. The output
will tell you if this service has the standalone or xinetd mode:
sendmail is xinetd service
In our case it is in the xinetd mode. Now you can change the mode of the sendmail service
to standalone. To make it standalone, type the following line:
# vzsetxinetd 222 sendmail off
sendmail is standalone service
where off specifies that the sendmail service should be set to the standalone mode. The
output confirms that the sendmail service is now standalone.
For more information on the vzsetxinetd utility, consult the corresponding man pages or
refer to the Parallels Command Line Reference Guide.
Notes:
1. You cannot use the vzsetxinetd utility to change the mode of the xinetd-dependent
services in Containers where the Debian 3.0 OS template is installed.