Introduction to Linux system services

Services)

Read
Fedora
Service Management Guide

. Learn about services/daemons, runlevels, and various applications.
Tools used to manage services (Sevices.

You can use
Chkonfig or ntsysv
Command to manage services, or use a graphical user interface
System-config-Services Command. Gnome
User: System-> Management-> server settings-> services.

Introduction to a single service

Now we will introduce Fedora Core
6
Provides the functions of various services and provides suggestions for use. This is not a detailed list. Be careful: Do not close services that you are not sure about or do not know ).

Do not close the following services (unless you have good reasons ):

Acpid, haldaemon, messagebus, klogd, network, syslogd

Are you sure you want to modify the runtime Level 3 and
5.

 

 

NetworkManager
,
Networkmanagerdispatcher

NetworkManager
Is a background process that automatically switches network connections. Many notebook users needEnable
This feature allows you to switch between a wireless network and a wired network. Most desktop users shouldOff
Closed
This service. Some
DHCP users may need to enable it.

Acpid

ACPI (full name
Advanced Configuration and power
The service is a power management interface. We recommend that all Notebook usersEnable
It. Some servers may not need
ACPI. The following general operations are supported: "Power Switch", "battery monitoring", and "notebook lid ".
Switch "," laptop display brightness "," Sleep ",
"Hook up", and so on.

Anacron
,
ATD
, Cron

There is a small difference between these scheduling programs.
SuggestionsEnable
Cron. If your computer is running for a long time, you should turn it on. For servers, you should have a better understanding of which scheduler should be enabled. In most cases, the laptop/desktop shouldOff
Closed
ATD and anacron. Note: Anacron is required for executing some tasks, such as cleaning/tmp.
Or/var.

Apmd

Some laptops and old hardware
Apmd. If your computer supports
ACPI, you shouldClose
Apmd. If ACPI is supported, apmd
ACPI.

Autofs

This service automatically mounts removable storage (Ratio
Such as USB
Hard Disk ). If you use mobile media (such as mobile hard disk, u
Disk), recommendedEnable
This service.

Avahi-daemon
,
Avahi-dnsconfd

Avahi is
Zeroconf. It can be found in a LAN without DNS services based on
Zeroconf devices and services. It is the same as mdns. Unless you have compatible devices or use
Zeroconf service, otherwise it shouldClose
It. I disabled it.

Bluetooth
,
Hcid
, Hidd
, Sdpd
,
Dund
, Pand

Bluetooth is
Wireless portable devices (non-WiFi,
802.11 ). Many laptops provide Bluetooth support. There are Bluetooth mouse, Bluetooth headset, and mobile phones that support Bluetooth. Many people do not have bluetooth devices or services related to Bluetooth.Close
It.
Other Bluetooth-related services include hcid.
Manage all visible Bluetooth devices. hidd supports input devices (keyboard and mouse,
Dund supports connections to the network through Bluetooth dialing, pand
Allow you to connect to Ethernet via Bluetooth.

Capi

Only use
The user of the ISDN device is useful. Most users shouldClose
It.

Cpuspeed

This service can be dynamically adjusted at runtime
CPU
To save energy (power ). CPU of many laptops
Now more and more desktops support this feature. If your CPU
Yes: pew.m, Centrino, amd powernow, transmetta, Intel
Speedstep, Athlon-64, Athlon-X2, Intel Core 2
One of them should beEnable
It. If you want your CPU
Run at a fixed frequency.Close
It.

Cron

See
Anacron.

Cupsd
, Cups-config-daemon

Printer problems. If you can
Cups driven by Fedora
Compatible printer, you shouldEnable
It.

Dc_client
,
Dc_server

Disk cache (distcache)
Distributed session cache. Mainly used in SSL/TLS
Server. It can be used by Apache
. Most desktops shouldClose
It.

Dhcdbd

This is
Guest System Control DHCP
. Retain the defaultClose
Status.

Diskdump
,
Netdump

Diskdump
To help debug the kernel crash. After the kernel crashes, it will save
"Dump" file for analysis. The functions of netdump and diskdump
But it can be stored over the network. Unless you are diagnosing kernel-related issues, they should beClose
.

Dund

See
Bluetooth.

Firstboot

This service is
Fedora
The installation process is unique. It only needs to execute a specific task once when it is started for the first time after installation. It can beClose
.

GPM

Terminal mouse pointer support (no graphic border
). If you don't use a text terminal (CTRL-ALT-F1,
F2..).Close
It. However, at runtime level 3
Enable
It is at runtime Level 5Close
It.

Hidd

See
Bluetooth.

Maid
, Hpiod
,
Hpssd

Maid
The Service supports HP printers in Linux, including
Inkjet, deskjet, officejet, photosmart, business inkjet, and Part
LaserJet Printer. This is an HP Linux Print project sponsored by HP (HP Linux
Printing
Project. If you have a compatible printerEnable
It.

Iptables

It is a Linux
Standard firewall (software firewall ). If you connect directly to the Internet (such as cable, DSL, T1), we recommend that youEnable
It. If you use a hardware firewall (such as D-
Link, Netgear, Linksys
And so on. You can close it.We strongly recommend that you enable it.
.

Ip6tables

If you do not know whether you are using
IPv6 is not used in most cases. This service is used for IPv6
Software firewall. Most users shouldClose
It. Read here to learn how to disable
IPv6 support for Fedora

.

IRDA
, Irattach

IRDA
Provides communication support between infrared devices (laptops, PDAs, mobile phones, calculators, and so on. Most users shouldClose
It.

Irqbalance

In a multi-processor system, enable this service
To improve system performance. Most people do not use a multi-processor system, soClose
It. But I don't know how it works on multiple cores.
CPU's or hyper-threading CPU's system performance. In a single CPU
SystemClose
It should not be faulty.

ISDN

This is an Internet access method. Unless
You use ISDN
The cat comes to the Internet, otherwise you shouldClose
It.

Kudzu

This Service performs hardware detection and Configuration
. If you change the hardware or need to detect hardware changes,Enable
It. However, most desktops and servers canClose
It is started only when needed.

Lm_sensors

This service can detect the sensor value of the motherboard
Or the status of a specific hardware (usually used in a laptop ). You can use it to view the real-time status of your computer and understand its health status. It is in

Gkrellm

Popular among users. View lm_sensors

Home page for more information. If there is no special reason, we recommend that youClose
It.

Mctrans

If you use
SELinuxEnable
It. Fedora Core is enabled by default.
SELinux.

Mdmonitor

This service is used for monitoring
Software raid or LVM
. It is not a key service.Close
It.

Mdmpd

This service is used for monitoring
Multi-path
Device (this type of storage device can be accessed by more than one controller or method ). It should beClose
.

Messagebus

This is Linux
Interprocess
Communication, inter-process communication) service. To be exact, it corresponds
Interaction is an important system service.We strongly recommend that you enable it.
.

Netdump

See
Diskdump.

Netplugd

Netplugd
It is used to monitor network interfaces and execute specified commands when the interface status changes. We recommend that you retain its default value.Close
Status.

Netfs

This service is used for automatic mounting when the system starts.
Shared File space in the network, such as NFS and samba
And so on. If you connect to another server in the LAN and share filesEnable
It. Most desktop and notebook users shouldClose
It.

NFS
,
Nfslock

This is used
Unix/Linux/BSD
Standard file sharing methods for operating systems. Unless you want to share data in this wayClose
It.

Ntpd

When the service automatically updates the system over the Internet
. If you can maintain a permanent internet connection, we recommend that youEnable
It,But not required
.

Pand

See
Bluetooth.

Pcscd

This service provides Smart Cards (and
Card, the size of the small chip in the identification card is the same as that of the smart card reader. If you do not have a card reader deviceClose
It.

Portmap

This service is
NFS (file sharing) and NIS (verification) supplements. Unless you use NFS or NIS
Service, otherwiseClose
It.

Readahead_early
,
Readahead_later

The service is preloaded by a specific application
Sort To memory to provide performance. If you want the program to start fasterEnable
It.

Restorecond

Used
SELinux monitors and reloads the correct file context (File
Contexts ).It is not required, but if you use SELinux
We strongly recommend that you enable it.
.

Rpcgssd
,
Rpcidmapd
, Rpcsvcgssd

For NFS
V4. Unless you need or use NFS V4Close
It.

Sendmail

Unless you manage an email server or you want
Transfer or support a shared
IMAP or POP3
Service. Most people do not need an email transmission proxy. If you use a web page (Hotmail/Yahoo/Gmail) or
For example: Thunderbird, kmail, Evolution
And so on. You shouldClose
It.

Smartd

Smart Disk
The monitoring service is used to monitor and predict disk failures or disk problems (prerequisite: the disk must support
Smart ). Most desktop users do not need this service, but we recommend that youEnable
It, especially the server.

SMB

Samba
A service is required to share files between Linux and Windows. If Windows
If you need to access files on LinuxEnable
It. View how
Configure Samba under Fedora Core 6

.

Sshd

SSH
Allow other users to log on to your system and execute programs. The user can be a network or remote user. Enabling it has potential security risks. If you do not need to log on from another machine or remotely
You shouldClose
It.

Xinetd

(This service may not be installed by default) it is
A special service. It can start multiple services according to the requests received by a specific port. For example: Typical
The telnet program is connected to port 23. If a Telent request is sent to port 23
Xinetd detects that xinetd will start telnetd
Service to respond to this request. For ease of use, you canEnable
It. Run chkconfig
-- List: Check the output related to xinetd to find out which services are affected by xinetd.
Management.