CentOS Common Service Detailed explanation

Acpid power management by suspending unnecessary equipment, reducing the frequency of the CPU or other methods, can reduce the energy consumption, achieve the purpose of saving electricity.

APMD--APMD is used to monitor the power state of the system and to write related information to the log via SYSLOGD. can also be used to shut down when power is low

arpwatch--is used to maintain the correspondence between Ethernet physical address and IP address

Anacron does not consider cron services during system downtime

atd--runs the task that the user schedules with the AT command. Also run a batch task when the system load is low

autofs--automatically reprint file system when you need it and uninstall automatically when you don't need it

CHARGEN--TCP version of Chargen server

CHARGEN-UDP--UDP version of Chargen server

crond--the task of running user scheduling periodically. More properties than traditional UNIX versions, more secure and simpler to configure

DAYTIME--TCP version of Daytime server

DAYTIME-UDP--UDP version of Daytime server

ECHO--TCP version of Echo server

ECHO-UDP--UDP version of Echo server

eklogin--Accept Rlogin session authentication and a service with KERBEROS5 encryption

finger--Service for answering finger requests

gpm--provides mouse support for Linux programs in text mode. It also supports copy of the console mouse, sticky actions, and pop-up menus (required)

gssftp--accepts FTP connections that can be KERBEROS5 authenticated

Httpd--http is a well-known WWW server that can be used to provide HTML files and CGI dynamic content services

identd--provides a way to verify identity

Ipchains--ipchains Packet Filter Firewall

Iptables--iptables Packet Filter Firewall

ipvsadm--call Ipvsadm to establish and maintain Ipvs routing table

isdn--Enable ISDN (Integrated Services Digital Network) services

kadmin--Change the Kadmin tool that uses this machine in the master KDC, or through the Kadmin service to complete

kdcrotate--Settings KDCs table entries in the/etc/krb5.con configuration file

keytable--the function of the program is to reprint the keyboard mapping table that you described in/etc/sysconfig/keyboards

klogin--accepts BSD-mode rlogin sessions, but requires KERBEOS5 validation

kprop--whether to allow the upgrade of the master KDC to be received by the KDC

krb5-telnet--allows normal Telnet login, but can also use KERBEROS5 authentication

krb524--is the lease certificate to change the KERBEROS5 to Kerberosiv

krb5kdc--Open Kerberosiv and 5 required connections to obtain lease certificate

kshell--accepts Rshell command authentication and services with Kerberos encryption

kudzu--runs hardware detection and optionally sets hardware changes

LPD--LPD is the system print daemon, which is responsible for submitting programs such as LPR to the print job

netfs--is responsible for loading/unloading NFS, Samba, NCP file systems

network--Activate/shutdown each network interface at startup (required)

Nfs--nfs is a popular file sharing protocol based on TCP/IP networks. This service provides an NFS file sharing service (abbreviated to Nfs:net file system, the network filesystem).

NFS allows a system to share directories and files with other people on the network. By using NFS, users and programs can access files on the remote system as they would access local files.

nfslock--provides NFS file lock function

nscd--This service is responsible for passwords and group queries, and buffers query results

Portmap--portmap is used to support RPC connections and RPC is used for services such as NFS and NIS

Postgresql--postgresql relational database Engine

random--a high quality random number generator for storing and restoring systems, which are provided by random behavior of the system

Rlogin--rlogin program services, providing registration from a remote trust host

routed--The daemon supports automatic IP routing table maintenance for RIP protocols. RIP is primarily used on small networks, and larger networks require

A little more complicated protocol

rsh--provides rcmd or RSH program services

The RSTATD--RSTAT protocol allows users on the network to obtain performance parameters for each machine on the same network

rsync--a good addition to the FTP service, allowing for cyclic code summation and verification

rusersd--This service enables network users to locate other users on the same network

The Rwalld--rwall protocol allows remote users to send messages to terminals active in the same system, similar to wall local behavior

rwhod--allows remote users to obtain a list of all logged-in users on the machine running the Rwho wizard, similar to finger

smb--to start and close the SMBD and NMBD Daemon to provide SMB network services

snortd--A lightweight network intrusion detection Tool

Swat--samba Network Configuration tool that uses SWAT for 901-port connections to the browser

Syslog--syslog is the operating system that provides a mechanism by which daemons use these mechanisms to write various information to individual system log files (required)

telnet--provides Telnet service to authenticate with unencrypted user/password group

TIME--TCP version of RFC 868 time server

TIME-UDP--UDP version of RFC 868 time server

Webmin--webmin is a powerful management tool based on Web to set system management and network management.

xfs--starts and stops the X font service on boot and shutdown, and may regenerate the font table (required)

xinetd--Internet Operation Service Program. Provides functionality similar to Inetd+tcp_wrapper, but more powerful and secure,

Monitor the network's requirements for various services it manages, and start the appropriate service procedures when required

ypbind--the server side of network information service