Shulou(Shulou.com)06/01 Report--

This article will explain in detail the example analysis of the linux startup item ntsysv and run-level runlevel settings. The editor thinks it is very practical, so I share it with you for reference. I hope you can get something after reading this article.

Operation level

Vi / etc/inittab

# 0-stop (never set initdefault to 0)

# 1-single user mode

# 2-Multi-user, no NFS

# 3-full multiuser mode (standard runlevel)

# 4-not used

# 5-X11 (xwindow)

# 6-restart (never set initdefault to 6)

=

Run the ntsysv command under the root user to get rid of the service you don't want.

Introduction to linux Startup items

Acpid power management can reduce energy consumption and save power by suspending unnecessary devices, reducing the frequency of CPU or other methods.

Apmd--apmd is used to monitor the power status of the system and write relevant information to the log through syslogd. It can also be used to turn off the computer when the power supply is insufficient.

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 tasks that the user dispatches with the at command. Also run batch tasks when the system load is low

Autofs-- automatically reloads the file system when you need it, and unmounts it automatically when you don't need it

Chargen--tcp version of chargen server

Chargen-udp--udp version of chargen server

Crond-- runs user-scheduled tasks periodically. Compared with the traditional version of unix, it adds a lot of attributes, and it is more secure and easier 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

A service that eklogin-- accepts rlogin session authentication and encrypts with kerberos5

The service used by finger-- to respond to finger requests

Gpm-- provides mouse support for linux programs in text mode. It also supports copy of the console mouse, paste operations and pop-up menus (must)

Gssftp-- accepts ftp connections that can be verified by kerberos5

Httpd--http is a famous www server, which can be used to provide html files and cgi dynamic content services.

Identd-- provides a method to verify identity

Ipchains--ipchains packet filtering Firewall

Iptables--iptables packet filtering Firewall

Ipvsadm-- calls ipvsadm to establish and maintain the ipvs routing table

Isdn-- enables isdn (Integrated Services Digital Network) service

Kadmin-- changes are made using native kadmin tools in the master kdc, or through kadmin services

Kdcrotate-- settings kdcs entries in the configuration file / etc/krb5.con

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

Klogin-- accepts rlogin sessions in bsd mode, but requires kerbeos5 authentication

Does kprop-- allow upgrades of master kdc received by kdc?

Krb5-telnet-- allows normal telnet login, but can also use kerberos5 authentication

Krb524-- is to change the lease certificate from kerberos5 to kerberosIV.

Krb5kdc-- opens the connection required by kerberosIV and 5 to obtain the lease certificate.

Kshell-- accepts rshell commands to authenticate and encrypt with kerberos

Kudzu-- runs hardware detection and optionally sets hardware changes

Lpd--lpd is the system print daemon that is responsible for submitting programs such as lpr to the print job.

Netfs-- is responsible for mounting / unmounting nfs, samba, ncp file systems

Network-- activates / shuts down each network interface at startup (must)

Nfs--nfs is a popular file sharing protocol based on tcp/ip network. The service provides nfs file sharing service (nfs: Net File System, short for network file system).

NFS allows a system to share directories and files with others on the network. By using NFS, users and programs can access files on remote systems as if they were local.

Nfslock-- provides nfs file locking function

Nscd-- this service is responsible for querying passwords and groups and buffering 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-- saves and restores the system's high-quality random number generator, which is provided by some random behaviors of the system.

Rlogin--rlogin program service that provides registration from remote trusted hosts

Routed-- this daemon supports automatic ip routing table maintenance of the rip protocol. Rip is mainly used on small networks, and larger networks need

A more complex agreement

Rsh-- provides services for rcmd programs or rsh programs

Rstatd--rstat protocol allows users on the network to obtain the performance parameters of each machine on the same network.

A good addition of rsync-- to ftp services, allowing cyclic code summation and checking, etc.

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 the local behavior of wall

Rwhod-- allows remote users to get a list of all logged-in users on the machine running the rwho wizard, similar to finger

Smb-- starts and closes smbd and nmbd wizard programs to provide smb network services

Snortd-- is a lightweight network detection tool.

Swat--samba network configuration tool, you can use swat through the 901 port connection of the browser

Syslog--syslog is a mechanism provided by the operating system that daemons usually use to write various information to various Syslog files (must)

Telnet-- provides telnet services that use unencrypted user / password groups for authentication

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, which integrates system management and network management.

Xfs-- starts and stops the x font service when booting and shutting down, and may regenerate the font table (required)

Xinetd-- Internet operation service program. Provides features similar to inetd+tcp_wrapper, but more powerful and secure

Monitor the requirements of the network for the various services it manages, and start the corresponding service programs when necessary

Server side of Network Information Service realized by ypbind--

Amd automatically installs the NFS daemon

Apmd Advanced Power Management

Arpwatch logs and builds a database of Ethernet address and IP address pairs seen on the LAN interface

Atd services for at and batch

(the at command is used to run a command or script at a specific time, unlike cron, because the work is only run once, and the batch command is very similar to the at command, but it is defined as: a given command is run when the load average falls below a certain level, and the default limit of the load average is 0.8, but the superuser (root) can specify a different limit.

The work submitted through the at and batch commands is handled by the atd monitoring process, which works similar to cron, but has a maintainer work queue and the time they should run. The ATD monitoring process does not need to keep checking for new work, it just waits to know that the specified time is up and starts work in a queue.)

Autofs automatically installs the management process automount, related to NFS, dependent on NIS

Crond provides running services for automatically scheduled processes under Linux.

Gpm provides support for mouse in character mode.

Keytable is used to load keyboard images

Kudzu hardware detector

Netfs installs and uninstalls NFS, SAMBA, and NETWARE network file systems

Network activates scripts with configured network interfaces

Nfslock NFS lock

Pcmcia installs pcmcia card (generally used for notebook computers)

Sshd OpenSSH server

Syslog A script that allows the system to start syslog and klogd Syslog waiting mileage when the system boots

Xfs Xwindow font server, which provides font sets for local and remote X servers

Xinetd supports core daemons for a variety of network services.

The service with an asterisk is automatically started by the system by default:

FreeWnn

Amanda

Amd, this seems to manage mixer devices.

Amidxtape

* anacron (Command scheduling)

* apmd (Advanced Power Management)

Arpwatch (see ARP? )

* atd (function cron is similar)

* autofs (auto-mount file system)

* bcm5820

Bgpd

Cwnn

Bootparamd (start parameter management?)

Chargen

Chargen-udp

Comsat

* crond

Daytime (daylight saving time managed daemon?)

Daytime-udp (udp- user Datagram protocol, which is the same level as TCP)

Dbskkd-cdb

Dhcpd (dynamic host service)

Echo (server echo customer data service)

Echo-udp (UDP version of echo)

Eklogin

Finger (finger Service)

Gated (Gateway Service)

* gpm (mouse under the console)

Gssftp (gssftp server and wu-ftp server)

Httpd (Hypertext Protocol Service)

Identd

Imap (imap protocol in mail service)

Imaps (imap protocol in mail service?)

Innd (Internet News Service)

* ipchains (firewall)

Ipop2 (outgoing service of mail service, version 2)

Ipop3 (3rd edition of the mail service)

* iptables (firewall)

Irda

* iscsi (using high-speed direct connect to form SCSI disk array)

* isdn (provides support for isdn devices)

Junkbuster

Kwnn

Kadmin

Kdcrotate

Keytable (keyboard configuration)

Klogin (remote login)

Kprop

What is krb5-telnet (what is krb5? Provide telnet services?)

Krb524

Krb5kdc

Kshell

* Kudzu

Ldap (directory service)

* linuxconf (question: why does linuxconf start as a service?)

Linuxconf-web (open the web configuration port of linuxconf)

* lpd (support for printers)

Mars-nwe (simulated novell network server)

Mcserv

Mysqld (provides support for mysql databases)

Named (Domain name Server)

* netfs (network file system)

* network (provides network support)

Nfs (Network File system)

* nfslock (Network File system Lock?)

Nscd

Ntalk (talk- online chat service)

Ntpd

Ospftd

Spfd

* pcmica (provides support for PC cards)

Pop3s (is it pop3's server?)

* portmap (port mapping list, but it is not clear what it is for)

Postgresql (provides support for postgresql databases)

Radvd

* random (random numbers that generate and store high-precision data operations, why should they be started automatically?

Rawdevices (seems to support read-write devices such as tape drives?) (Read After Write)

Regongfig (support remote configuration?)

Rexec (remote execution?)

Rhnsd

Ripd

Ripngd

Rlogin (remote login is supported)

Routed (linux routing Service)

Rsh (r shell?)

Rstatd

Rsync

Rusersd

Rwalld

Rwhod

* sendmail (the famous mail server)

Smb (is it samba?-- Yes)

Sgi_fam

Snmpd (simple Network Management Service)

Squid (proxy server)

Swat (901web configuration for smb)

* systlog (Syslog service)

Talk

Telnet (telnet Service)

Time (reverberation system time)

Time-udp (UDP version of the echo system time)

Tux (seems to be a high-speed static web based on kernel)

Ups (provide control support for ups?)

Vncserver

* wine (execute windows binaries directly under linux!)

Wu-ftpd (ftp server of the University of Washington. It works very well.

Xfs (x font server)

Xinetd (new version of Internet server)

Ypbind

Yppasswdd

Ypserv

Yhpxfrd

Keytable (keyboard innuendo, for Korean, Japanese, German, etc.)

Check if there are any changes in PC hardware when KZUZU---- starts the system. For example, changing the graphics card will prompt you to reconfigure XF86.

* gpm- seems to implement the CP and PASTE functions of mouse in console mode.

* crond--- a periodic command scheduler based on UNIX

Swat---- Windows-based samba configuration Program

Xfs---Xwindows Font Server

Bgpd (bgp routing Protocol daemon)

* gpm (mouse driver in character terminal state)

* ipchains (firewall process under 2.0 kernel)

* iptables (firewall process)

Kshell (kshell)

Ldap (ldap service process)

Ntalk (Network talk process)

Ntpd (Network time Service process)

Ospftd (ospf routing protocol process? )

Spfd (spf routing protocol process? )

Ripd (rip routing protocol process)

Smb (is it samba?)-Yes

Squid (proxy service process)

Talk (it should be a native talk process)

Zebra (a well-known suite of routing services)

Cwnn Chinese input method

Redhat Linux 8.0 Workstation Service load list

Service list

-

Amd: run the automount wizard, which automatically installs some local devices and NFS file systems if necessary.

Apmd: used to monitor the power status of the system and write relevant information to the log through syslogd. It can also be used to turn off the computer when the power supply is insufficient.

Arpwatch: this program is mainly used to maintain the correspondence between Ethernet physical address and IP address.

Atalk: AppleTalk wizard program. Be careful not to run the program in the background. The data structure of the program must take some time to initialize before running other processes.

Atd: runs a task scheduled by the user with the At command. Batch tasks are also run when the system load is low.

Autofs: automatically reloads the file system when you need it, and unmounts it automatically when you don't need it.

Bootparamd: this service allows old Sun workstations to boot from the Linux network, and he and rarp are currently very rarely used, basically replaced by bootp and dhcp.

Crond: cron is a traditional program under Unix that runs user-scheduled tasks periodically. Compared to the traditional Unix version, the Vixie version adds a lot of properties, and it is safer and easier to set up.

Dhcpd: this wizard provides access support for dynamic Host Control Protocol (Dynamic Host Control Protocol).

Gated: gated provides network routing support through a database. He supports a variety of routing protocols, including RIP versions 1 and 2, DCN HELLO protocol, OSPF version 2, and EGP versions 2 through 4.

Gpm: provides mouse support for text-mode Linux programs such as mc (Midnight Commander). He also supports mouse copy and paste operations and pop-up menus under the console.

Httpd: http is a famous www server that can be used to provide HTML files and CGI dynamic content services, such as APache.

Xinetd: Internet operation service program. Monitor the network's requirements for various services he manages, and start the corresponding service program if necessary. Typically, the programs managed by inetd are telnet, ftp, rsh, and rlogin. Shutting down inetd shuts down the services he manages.

Innd: inn is the most popular user group news server. He allows you to set up a local news server. It is difficult to set up. You can read the / usr/doc/ inn* file first for help.

Keytable: the function of this program is to reprint the keyboard mapping table you stated in / etc/sysconfig/keyboards, which can be selected through the kbdconfig tool. You should make the program active.

Ldap: LDAP stands for Lightweight Directory Access Protocol and implements the industry standard for directory access protocols.

Linuxconf:linuxconf is an effective system setup tool under Linux, which allows remote operation.

Lpd: lpd is the system print daemon that is responsible for submitting programs such as lpr to the print job.

Mcserv: the Midnight Commander service process allows users on remote machines to manipulate native files through the idnight Commander file manager. The service process uses PAM to authenticate the user and needs to give a "username / password" to pass the authentication.

Mysql: a fast, efficient and reliable lightweight SQL database engine.

Named: domain name server that resolves Internet hostnames to dotted IP addresses. The most famous is bind.

Netfs: responsible for mounting / unmounting NFS, Samba, NCP (Netware) file systems.

Network: activates / shuts down each network interface at startup.

Nfs: NFS is a popular file sharing protocol based on TCP/IP networks. This service provides NFS file sharing service, which is set up in the / etc/exports file.

Nscd: this service is responsible for querying passwords and groups and buffering query results. If your system has slow services (such as NIS and NIS+), you should start the service. Cmciapcmcia is mainly used to support notebook computers.

Portmaportmap: used to support RPC connections, RPC is used for services such as NFS and NIS.

Postgresql:PostgreSQL relational database engine.

Proftpdroftpd is a flexible ftp daemon under Unix.

Radvd: routing broadcast program.

Random: a high-quality random number generator that saves and restores the system, which is provided by some random behavior of the system.

Routed: this daemon supports automatic IP routing table maintenance for the RIP protocol. RIP is mainly used on small networks, and larger networks require more complex protocols.

Rstatd: Rstat protocol allows users on the network to obtain the performance parameters of each machine on the same network.

Rusersd: this service enables network users to locate other users on the same network.

Rwalld: the Rwall protocol allows remote users to send messages to terminals active in the same system, similar to the local behavior of wall.

Rwhod: allows remote users to get a list of all logged-in users on the machine running the rwho wizard, similar to finger.

Sendmail: a famous mail server.

Smb: start and close smbd and nmbd wizard programs to provide SMB documents and network printing network services.

Snmpd: the daemon of simple Network Management Protocol (SNMP).

Syslog: syslog is a mechanism provided by the operating system that daemons usually use to write various information to individual system log files. The service should usually be started.

Xfs: font server for X.

Ypbind: client daemon for NIS/YP. If you need to use a NIS/YP machine, please start the service, otherwise, turn it off.

Yppasswd: enables NIS users to change their passwords. Running on a server in the NIS domain. The client program is also called yppasswd.

Ypserv: an implementation of the standard NIS/YP network protocol. Allow hostnames, usernames, and other information to be distributed across the network. Running on the NIS server, the client does not have to.

Mars File and Printer sharing for netware client

File and print sharing on Nfs tcp/ip Network

Vncserver remote Desktop x-window Management

Rarpd reverse parsing

Rhnsd, kprop automatic update service

Self-monitoring in Smartd background

Amada,amadaidx amidxtpe amada backup system

Isiam, kudzu hardware detection and setup

Keytable keyboard mapping

Irda Irda stack for linux

Comsat: userd by biff client when new mail comes

Ups:ups daemon automatically starts or shutdwon

Tux:the tux threaded kernel-based httpd server

Servers:internal xinetd service listing active services

Iebra:Irda stack for linux

Start the service ntsysv

NetworkManager

NetworkManagerDispatcher

Acpid

/ proc/acpi/event

Advanced Configuration and Power Interface, a new power source management standard to replace the traditional APM power source management standard

If you need to manage the power source, you need to start it.

Amanda

Amandaidx

Amd

Amidxtape

Anacron

/ etc/anacron

A customized bank task. Red Hat Linux provides four tools for customizing tasks: cron, anacron, at, and batc. When your Linux host is not powered on around the clock, this anacron will allow you to perform work that has not been performed during the time set by "crontab". For example, when your mainframe shuts down automatically at 12:00 in the evening, but the routine work of crontab works at 4:00, then the routine work won't work. But you can do it with anacron.

If the host has been turned on for 24 hours and the cron is running, then this guard program does not need to be started.

Apmd

/ etc/sysconfig/apmd

Advanced Power Management, advanced power source management. Traditional power source management standards. General systems will support APM and APMD tags at the same time, but only one additional tag is needed when the system is added. It is useful for the comparison of traditional computers to understand the "cell power" of the system.

If we use a desktop computer or a model that is always on, we don't need to use this guard program.

Apt

Arptables_jf

Arpwatch

Atalk

Atd

/ etc/at.allow,/etc/at.deny

A customized bank task.

It usually needs to be started. However, if you use cron all the time, you can not start it.

Auditd

Used to store kernel-generated system check records, these records will be used by some programs. Especially for SELinux users, let's leave it open.

Auth

Autofs

/ etc/rc.d/init.d/autofs

If your Linux is used as a server, then this service does not need to be started. Because this service can automatically access a lot of file systems and files, for example, automatic storage of compact discs, USB hard drives, and so on. If it is the host, we can control it by ourselves and there is no need for systematic automatic storage. If it's a personal desktop computer, it's good to start this daemon!

Generally, it does not need to be started.

Bgpd

Bluetooth

Bootparmd

Canna

Capi

ISDN hardware support, most of which can be turned off with hardware.

Ccsd

Chargen 、 chargen-udp

TCP/UDP 19

Character Generator Protocol, a web service, the main function is to provide type-like typing function. More stories: http://www.networksorcery.com/enp/RFC/Rfc864.txt

For the sake of safety, please take care of this service.

Clvmd

Cman

Cpuspeed

Monitor the percentage of system idle, reduce or speed up CPU time and power consumption to minimize energy consumption when the system is idle, and maximize system operation speed when the system is busy. More stories: http://altlinux.org/index.php?module=sisyphus&package=cpuspeed

It needs to be started.

Crond

/ etc/crontab

A maintenance program used to execute routine commands.

Must be started.

Cups

CUPS server configuration file: / etc/cups/cupsd.conf

CUPS client profile: / etc/cups/client.conf

CUPS Printer profile: / etc/cups/printers.conf

CUPS class configuration file: / etc/cups/classes.conf

Port 631

Common UNIX Printing System, public UNIX printing support, provides printing capabilities for Linux.

If you do not install the printer, you do not need to start it.

Cups-lpd

CUPS Line Printer Daemon ("LPD"), which provides printing function.

If you do not install the printer, you do not need to start it.

Cvs

Daytime 、 daytime-udp

TCP 13

The Daytime Protocol (RFC867) is a simple protocol that implements the function of fetching dates and times from the client server. Used as a service for daytime, which is the previous generation of NTP (Network Time Protocol), for time correction. However, because he does not count the dead time in the network connection process and sends it in a clear code, it is rarely used except for special purposes.

No need to start.

Dc_client 、 dc_server

Dhcdbd

Dund

Dhcp6s

Dhcpd

Dhcrelay

Dictd

Diskdump

Dovecot

Echo 、 echo-udp

Port 7

The server returns the customer data service.

No need to start.

Eklogin

Fenced

Finger

Firstboot

Gfs

Gkrellmd

Gpm

/ etc/sysconfig/mouse

General Purpose Mouse Daemon, gpm provides mouse support for text-mode Linux programs such as mc (Midnight Commander). It also supports mouse copying, gluing operations and menu lists under the console.

It is recommended not to start it if it is not necessary.

Gssftp

Port 21

To replace the traditional ftp server and provide the authentication mechanism of krb5

Haldaemon

Hidd

Bluetooth, hcid, hidd, sdpd, dund, pand

The teeth are related to each other, and those without teeth are related.

Hpoj

Httpd

Iiim

Innd

Ip6tables

Ipsec

Iptables

Fire prevention.

If you want to use it, iptables-save must be enabled, or you may not use it. You can use your own script.

Ipvsadm

Irda

Infrared Data Association is an industrial standard for the implementation of external wireless data transmission.

Irqbalance

Implement balanced maintenance procedures for system performance in multiple system processor environments.

If you have only one CPU installed, you do not need to add this guard program.

Isdn

Integrated Services Digital Network, subscribe to the number service network. Provides support for isdn appliances.

Isicom

Kadmin

Kdump

Klogin

Kprop

Krb5-telnet

Port 23

To replace traditional telnet services and provide an authentication mechanism for krb5

Do not start

Krb524

Kshell

Ktalk

Kudzu

The hardware automatic check program will automatically check whether the hardware has occurred or not, and correspond to the addition, deletion and modification of the hardware.

Ldap

Lirc

Lisa

Lm_sensors

Lock_gulmd

MDNSResponder

Mailman

Mcstrans

Mainly used in SELinux. If you don't use SELinux, you can turn it off.

Mdmonitor

The guard procedures associated with the RAID appliance.

Mdmpd

The guard procedures associated with the RAID appliance.

Messagebus

D-BUS is a database that provides one-to-one communication for two or more applications. Dbus-daemon-1 is an application that uses this platform to implement messagebus daemons.

Multiple applications can communicate with other programs by connecting to the messagebus daemon.

Microcode_ctl

You can encode and send new microcodes to kernel to update the Intel IA32 series processors (Pentium Pro,PII,PIII,Pentium 4celeron, Xeon, etc.-all P6 and higher, excluding pentium classics).

Multipathd

Mysqld

Named

Netdump

News Backup Dump Server, the process server.

Netdump-server

Netfs

/ etc/fstab

Network Filesystem Mounter, install and uninstall NFS, SAMBA, and NCP network file systems.

Open only if your host has a disk file system on the default network.

Netplugd

/ etc/netplug/netplugd.conf

/ etc/netplug.d/netplug

Network cable hotplug management daemon,netplugd is a daemon that monitors the status of one or more network interfaces and runs an external server when certain events are triggered.

Network

/ etc/sysconfig/network, / etc/sysconfig/netw-rk-script/*

Activate all network interfaces when the system starts.

Must be started

Nfs

/ etc/sysconfig/nfs

Related to portmap servic

Web file system.

Nfslock

NFS is a popular protocol for sharing files over TCP/IP networks, and this service provides NFS file customization.

Nifd

Nscd

Ntalk

Ntpd

/ etc/ntp.conf,/etc/sysconfig/ntpd

Port 123

Network time Protocol daemon, Network time Correction Protocol. In short, NTP is a protocol used to synchronize the system with a precise timing source.

It is recommended that you read an article: "the computer time in the NTP- Internet is accurate to milliseconds." published in December 2004 in the journal "in Technology" No. 63.

Ospf6d

Ospfd

Pand

Pcmcia

Pcmcia card, PCMCIA appliances that support downloading this computer, such as custom solver, network adapter, SCSI card, etc.

Pcscd

Smart card support, unrelated

Portmap

Port 111

Portmap daemons provide dynamic port assignments for RPC services such as NIS and NFS.

Postfix

/ etc/postfix/*

Port 25

Postgresql

Privoxy

Psacct

Includes several tools for monitoring process activities, including ac,lastcomm, accton and sa.

Radiusd

Radvd

Random

It is important for the system to quickly store the status of the system in the scene file during the shutdown time. Because after the boot, the system will quickly return to the state before the start-up.

Must be started.

Rarpd

Rawdevices

The daemon used to add to the raw appliance when using the cluster file system.

Rdisc

Readahead

Readahead_early

/ etc/readahead.early.files / etc/readahead.files

Readahead and readahead_early are the latest guardians of several background lines introduced in Fedora core 2. Its function is that during the startup of the system, the files needed to start the system are first fetched into memory and then executed in memory to speed up the startup speed of the system. The above two configuration files hold a list of files to be fetched to memory.

Readahead_later

Restorecond

SELinux is used for monitoring documents. It can be turned off without SELinux.

Rexec

Rgmanager

Rhnsd

Red Hat Web service. Inform you of official security information and support your system.

Ripd

Ripngd

Rlogin

Rpcgssd 、 rpcidmapd 、 rpcsvcgssd

Gestion NFS v4 is a new addition to the kernel of Linux 2.6.

It does not need to be started.

Rsh

Rstatd

Rsync

Remote sync, the process data sharing tool.

Rusersd

Rwalld

Rwhod

Saslauthd

Use SASL's security guard program.

Sendmail

Message server.

Services

An internal xinetd service for listening to activities.

Sgi-fam

Realize the real-time statistics. Monitor changes to files and provide an application API interface to notify when the specified file fire changes.

Smartd

Self Monitor Analysis and Reporting Technology System, monitor whether there is something wrong with your hardware.

Smb

/ etc/samba/*

Port 137 million 139,445

Snmpd

Snmptrapd

Spamassassin

Squid

Sshd

/ etc/ssh/*

Port 22

Secure Shell Protocol, realize the safe operation of this computer.

Swat

Syslog

/ etc/syslog.conf

Record all system actions.

Must be started.

Sysstat

Talk

Telnet

Tftp

Time

The time and date are fetched from the process host and the TCP protocol is adopted.

Time-udp

The time and date are fetched from the process host and the UDP protocol is adopted.

Tomcat5

Tux

Ups

Uucp

Vncserver

VNC (Virtual Network Computing), which provides a quantitative protocol for displaying the entire "desktop" of programming computers on the local system.

Vsftpd

Winbind

Wine

Wpa_supplicant

Xfs

/ usr/sbin/chkfontpath starts and launches directly

TCP 7100

X font server,X Window font server, which provides a font set for local and remote X servers.

If you use a zigzag interface with run-level 5, you need to start it.

Xinetd

/ etc/xinetd.conf, / etc/xinetd.d/*

Xinetd, as a subsequent version of inetd, manages the services that are not frequently used in the system. These services are started by the xinetd service server only when there is a request. Once the service request program is finished, it can effectively reduce the utilization rate of system resources. Typically, the programs managed by xinetd are telnet, ftp, rsh, and rlogin. Closing inetd also shuts down these services managed by it.

Must be started.

Ypbind

Yppasswdd

Ypserv

Ypxfrd

Yum

/ etc/yum.conf

Yellow Dog UpdaterModified, a manager that automatically updates, installs, and removes RPM packages, automates the management of packages and determines which packages should be installed and which should not be installed.

Decide whether to start or not according to the system management policy.

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