Linux system service startup and the prohibition and the corresponding port number

1. to start the telnet, first of all you must have installed the telnet Server, so rpm query first to see if there are any installation telnet-server.

[/Rpm-qa | grep telnet-server] If you did not install, download or find CD, installation [yuminstalltelnet-server] installation. 2, as is the management, the first superdaemon editable/etc/xinetd.d/telnet this file, the [disable = yes] into [disable = no] to [/etc/init.d/xinetdrestart] restart superdaemon. 3. Use netstat-tnlp check start PORT23. 4, start-up data placed in/etc/rc.d/rc [0-6] .d/inside, you can use ntsysv and chkconfig command to control, whether or not to post to start the service. For example: 1. To do a lookup on portmap this program will execute? 2. If you post it, how to change it to a post, don't start? 3. How to immediately close the PORTMAP service? You can try [chkconfig--list | grepportmap] and [runlevel] to confirm your environment and PORTMAP is started. (You can view the current runlevel starts interface. Chkconfig can view program startup or not. OFF not started. NO boot. ) If you have started, available [chkconfig--level35portmapoff] to set the boot-time do not start; (3 to 5 for the text interface, graphical interface. ) Can be used [/etc/init.d/portmapstop] to immediately shut down the service. Normal program services need to be started. Acpid-new version of power NASA science module, it is generally recommended, however, some notebook computers may not support this service, it would have to shut down. Atd-------in the management of a single appointment command execution services, should you want to start. Crond-----in the management of the scheduling of critical services, be sure to start. Iptables--Linux built-in firewall software, it can also be started. Keytables-if your keyboard informal format, this service starts may help you. Network---this is important, to network should he, network services. Sshd------this is the system preset starts, you can remote login in textual form. Syslog-system login file records, very important, be sure to start. Xinetd--the superdaemon, so also to start. Xfs-------used to manage glyph data service XWindow, if you need this service XWindow to start. Other service programs, and then set startup when needed.