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  Linux Services Comments
     
  Add Date : 2018-11-21      
         
         
         
  Acpid
ACPI (Full name of Advanced Configuration and Power Interface) power management service interface. It recommended that all notebook users to open it. Some servers may not need acpi. General operating support are: "Power Switch", "battery monitor", "Laptop Lid Switch", "Laptop Display Brightness", "sleep", "hang up", and so on.

anacron, atd, crond
These have little difference scheduler. Recommended to enable cron, if your computer will run a long time, it should open it. For the server, it should be more understanding to determine which should open the scheduler. In most cases, laptop / desktop should turn off atd and anacron. Note: perform some tasks require anacron, such as: clean up / tmp or / var.

alsasound
Alsa sound card driver daemon. Alsa sound card driver was supposed to one kind of sound card Gravis UltraSound (GUS) and write, the program proved to be very good, so the authors began to write for the general sound card driver. Alsa and OSS / Free and OSS / linux compatible, but has its own interface, even better than OSS.

apmd
Some notebooks and old hardware use apmd. If your computer supports acpi, you should close the apmd. If the support acpi, then apmd work will be done by the acpi.

arptables_jf
Arptables network for users to control daemon filtering.

arpwatch
Logging and build Ethernet address and IP address of a saw on the LAN interface to the database.

atalk
appleTalk network daemon. Be careful not to run the program in the background, the data structure of the program must first spend some time to initialize before running other processes.

auditd
The system administrator audit subsystem can be used to monitor system calls and file systems that meet the CAPP or other audit requirements visit. Its main contents include:
- By default, auditing is disabled in the kernel. However, when the auditd software installed, run the software will start the audit daemon (auditd).
- When auditd is running, audit information is sent to a user configuration log file (the default file is /var/log/audit/audit.log). If auditd is not running, review the information will be sent to syslog. This is done by the default settings to put information into / var / log / messages. If the audit subsystem is not enabled, no audit information will be generated.
- These audit information include SELinux AVC messages. Previously, AVC messages will be sent to syslog, but now will be sent to the audit daemon audit log file.
- To fully disable auditing in the kernel, using the parameter audit = 0 at boot time. You also need to use chkconfig auditd off 2345 to close the auditd. You can use auditctl -e 0 at run time to turn off auditing in the kernel.
Audit daemon (auditd) interface to obtain audit event data from the kernel's audit netlink. auditd configuration will vary, as output file configuration and log file disk usage parameters can be configured in /etc/auditd.conf file. Please note that if you set up your system for CAPP style auditing, you must set up a dedicated disk partition is for audit daemon. This partition should be mounted in / var / log / audit.
System administrators can also use the utility to modify the audit auditctl parameters auditd daemon runtime, syscall rules, and file system view. It includes a sample CAPP configuration, you can copy it to /etc/audit.rules to make it work.
Audit log data can be viewed and searched by ausearch utility.

autofs
The service automatically mount removable memory (such as USB hard drives). If you use removable media (such as mobile hard disk, U disk), it is recommended to enable this service.

avahi-daemon, avahi-dnsconfd
Avahi is to achieve zeroconf agreement. It can be found in the absence of DNS services LAN protocol based zeroconf equipment and services. It is the same as with mDNS. Unless you have a compatible device or use zeroconf protocol service, you should close it.

bootparamd
Boot parameter server, provide the relevant information needed to boot a diskless workstation on the LAN.

bluetooth, hcid, hidd, sdpd, dund, pand
Bluetooth (Bluetooth) wireless portable device is to be used (non-wifi, 802.11). Many laptops offer Bluetooth support. Bluetooth mouse, Bluetooth headsets and Bluetooth-enabled mobile phones. Many people have no Bluetooth device or Bluetooth-related services, they should close it. Other Bluetooth-related services are: hcid manages all visible Bluetooth device, hidd on input devices (keyboard, mouse) provides support, dund support via Bluetooth dial-up connection network, pand allows you to connect via Bluetooth Ethernet.

capi
Only useful for using an ISDN device users. Most users should disable it.

chargen
Using tcp protocol chargen server, chargen (Character Generator Protocol) is a network service, the main function is to provide a similar function remote typing.

chargen-udp
Using the UDP protocol chargen server.

chargen-dgram
chargen-stream

conman

cpuspeed
The service can dynamically adjust CPU frequency at run time to save energy (power). Many notebook CPU supports this feature, and now, more and more desktops also support this feature of. If your CPU is: Petium-M, Centrino, AMD PowerNow, Transmetta, Intel SpeedStep, Athlon-64, Athlon-X2, Intel Core 2 in a, you should open it. If you want your CPU to run at a fixed frequency, then close it.

cupsd, cups-config-daemon, cups-lpd
Printer-related.

cvs
cvs is a version control system.

daytime
Daytime use TCP protocol daemon, the protocol for the client to achieve get the date and time functions from a remote server. Default port: 13.
daytime-udp
Daytime use UDP protocol daemon.

daytime-dgram
daytime-stream

dc_client, dc_server
Disk cache (Distcache) for distributed session caching. Mainly used in SSL / TLS server. It can be apache use. Most of the desktop should close it.

dhcdbd
This is a make DBUS system control DHCP interfaces. You can keep the default off state.

diskdump, netdump
Disk dump (Diskdump) to help debug kernel crashes. After the collapse of the kernel it will save a "dump" file for analysis. Network dump (Netdump) function with Diskdump similar, except that it can be stored by the network. Problem unless you diagnose kernel-related, they should be shut down.

discard-dgram
discard-stream

dnsmasq
DNSmasq is a lightweight, easy to use tool for the DNS service, it can be applied in the internal network and the Internet connection when the IP address of the NAT, can also be used as a small network of DNS services.

echo
Echo client server data service daemon.
echo-udp
UDP protocol server echo client data service daemon.
echo-dgram
echo-stream

eklogin
Accepted daemon rlogin session authentication and encryption with kerberos5 a service.

ekrb5-telnet

firstboot
This service is specific to Fedora's installation process. It performs at the first start after installation only need to perform a specific task. It can be turned off.

functions

gated
Gateway routing daemon. It supports a variety of routing protocols, including RIP versions 1 and 2, DCN HELLO protocol, OSPF EGP version 2 and version 2-4.

gpm
Terminal mouse pointer support (no graphical interface). If you do not use text terminal (CTRL-ALT-F1, F2 ..), then close it. However, I open it in run level 3, level 5 running close it.

gssftp
Use kerberos 5 certified ftp daemon.

haldaemon
halt

hplip, hpiod, hpssd
HPLIP service realization HP printers supported on Linux systems, including Inkjet, DeskJet, OfficeJet, Photosmart, Business InkJet and LaserJet printer part. This is a product of HP Linux Printing project sponsored by Hewlett-Packard (HP Linux Printing Project) of. If you have a compatible printer, then enable it.

hsqldb
Relational database a java daemon, named after the Hypersonic SQL, but this project has no longer continued.

httpd
Apache Web server daemon can be used to provide HTML files and CGI dynamic content services.

innd
Usenet news server daemon.

iiim
Chinese input method server daemon.

inetd
Operation of the Internet daemon. Monitoring network requirements for various services it manages and initiate appropriate service procedures when necessary. It is xinetd instead of RedHat and Mandrake linux. debian, Slackware, SUSE is still used.

ip6tables
If you do not know whether you are using IPv6, in most cases that you do not use. The service is a software firewall for IPv6. Most users should disable it.

ipmi
iptables
It is the standard Linux firewall (software firewall). If you connect directly to the Internet (eg, cable, DSL, T1), it is recommended that you turn. If you use a hardware firewall (eg: D-Link, Netgear, Linksys, etc.), you can close it. It is strongly recommended to open it.

irda, irattach
Provide support for IrDA infrared communications equipment (laptops, PDA's, cell phones, calculators, etc.) between. Most users should disable it.

irqbalance
In a multiprocessor system, enable this service can improve system performance. Most people do not use a multi-processor system, so turn it off. But I do not know if it acts on multi-core CPU's or hyperthreading CPU's system effects. In a single-CPU system shut down it should not be a problem.

isdn
This is an Internet access. Unless you use ISDN cat to the Internet, otherwise you should turn it off.

keytable
Feature of the process is reproduced in the / etc / sysconfig / keyboards defined keyboard mapping table, which can be selected by kbdconfig tool. You should make the program active.

kdump

klogin
Telnet daemon.

krb5-telnet
Use kerberos 5 certified telnet daemon.

kshell
kshell daemon.

killall
krb524
kudzu
The service hardware detection and configuration. If you replace hardware or need to detect hardware changes, open it. But the vast majority of desktops and servers can turn it off, just when you need to start.

ldap
ldap (Lightweight Directory Access Protocol) directory access protocol server daemon.

libvirtd

lm_sensors
The service can detect the motherboard sensor values or specific hardware device status (generally used for laptops). You can use it to view real-time status of the computer to understand the health of the computer. It is more popular in GKrellM users. If there are no special reasons, it is recommended to close it.

lvm2-monitor
mcstrans
SELinux conversion services, if you use SELinux to open it, but you can also turn off.

mdmonitor
The service used to monitor Software raid or LVM information. It is not a critical service, you can close it.

mdmpd
The service used to monitor the Multi-Path device (the type of storage device controllers or can be more than one way to access). It should be shut down.

messagebus
This is the Linux of IPC (Interprocess Communication, interprocess communication) service. Rather, it interacts with DBUS, it is an important system services. It is strongly recommended to open it.

multipathd, microcode_ctl
It may encode and transmit the new microcode to the kernel to update the Intel IA32 processor family daemon.

mysqld
A fast, efficient and reliable light SQL database engine daemon.

named
DNS (BIND) server daemon.

netconsole

netfs
This service is used when the system starts to mount network shared file space, such as: nfs, samba and so on. If you are connected to the LAN and other servers for file sharing, turn it on. Most desktop and laptop users should disable it.

netplugd, ifplugd
Netplugd for monitoring network interfaces and executes the specified command when the interface state changes. It is proposed to retain the default off.

network
Enable / disable the various network interfaces daemon startup.

nfs, nfslock
This is a Unix / Linux / BSD family of operating systems standard file sharing. Unless you need to share data in this way, or else turn it off.

nscd
Service name cache process, it provides services such as NIS and LDAP authentication faster, if you run these services, then you should turn it on.

ntpd
The service automatically updates the system time via the Internet. If you can maintain a permanent Internet connection, it is recommended to open it, but not required.

pcscd
The service provides a smart card (and embedded in the same credit card, identification card of a small chip size) and smart card reader support. If you do not have card reader device, close it.

pcmcia
Mainly used to support notebook computer interface daemon.

portmap
The service is NFS (file sharing) and NIS (validation) supplement. Unless you use NFS or NIS service, or else close it.

postgresql
PostgreSQL relational database engine.

pppoe
ADSL connection daemon.

proftpd
proftpd is a flexible configuration of the ftp server daemon under Unix.

psacct
The daemon process includes several tools used to monitor the activities of tools, including ac, lastcomm, accton and sa.

random
Saving and restoring high-quality random number generator system, these random numbers are provided by the system of some random behavior.

rawdevices
When using a cluster file system for loading raw equipment daemon.

rdisc
readahead_early, readahead_later
The service through specific application pre-loaded into memory to provide performance. If you want the program to start faster, to open it.

restorecond
Used to reload SELinux to monitor and correct file context (file contexts). It is not necessary, but if you use SELinux, then open it is strongly recommended.

rhnsd
Red Hat Network Service Daemon. The official notification of safety information as well as the system patch.

routed
The RIP protocol daemon supports automatic IP routing table maintenance. RIP mainly used in small networks, larger networks will need more complex protocols.

rpcgssd, rpcidmapd, rpcsvcgssd
For NFS v4. Unless you need or use NFS v4, or else close it.

rsync
remote sync remote data backup daemon.

rsh
Start a shell on the remote host and executes user commands.

rwhod
All logged-on user list allows remote users to get the machine running the rwho daemon.

rstatd
Other machines to collect and provide a daemon on a LAN system information for.

ruserd
Remote User Locator Service, which is an RPC-based services, which provide information on the current record to a machine on the LAN log user information.

rwalld
Rpc.rwall service activation process, which is an RPC-based service that allows users to each registered machine on the LAN to another terminal to write a message.

rwhod:

Rwhod service activation process, it supports LAN and the rwho ruptime services.

saslauthd
Use SASL authentication daemon.

sendmail
Unless you manage a mail server or you want to pass or support a shared IMAP or POP3 service in the LAN. Most people do not need a mail transport agent. If you through the web (hotmail / yahoo / gmail) or use a mail program (such as: Thunderbird, Kmail, Evolution, etc.) send and receive mail. You should close it.

setroubleshoot
See selinux logs program

squid
Squid proxy server daemon.

smartd
SMART Disk Monitoring Service to monitor and predict disk failure or disk problems (premise: disks must support SMART). Most desktop users do not need this service, but it is recommended to open it, especially servers.

smb
SAMBA services is shared files must be in service between Linux and windows. If you have Windows users need to access files on Linux, you enable it.

snmpd
Local Simple Network Management daemon.

sshd
SSH allows other users to log on to your system and execute the program, the user can and you on the same network, it can be a remote user. Open it there is a potential safety hazard. If you do not need from another machine or from a remote log in, you should close it.

syslog
tcpmux-server
tftp

time
The daemon obtain the time and date from a remote host using TCP protocol.

time-udp
The daemon obtain the time and date from a remote host, using the UDP protocol.
time-dgram
time-stream

tux
Apache server daemon running in the Linux kernel.

vsftpd
Vsftpd server daemon

vmware-tools
After only some vmware-tools, virtual machines are installed with the vmware-tools package.

vncserver
VNC (Virtual Network Computing, Virtual Network Computing), which provides a display on the local system, remote computers across the "desktop" lightweight protocol.

winbind
Samba Winbind is a component in the CentOS system, he was included in the samba-common package. Winbind on Linux implementation of Microsoft RPC calls, Pluggable Authentication Module and name service switch, the interface obtained by contacting the samba with Windows domain controller, you can make NT domain users Linux user can operate on a Linux host. By setting nss configuration Linux server, we can let the system through Winbind to resolve user information program.

wpa_supplicant
Wireless LAN Internet Services

xend, xendomains
XEN virtual service-related

xfs
X Window font server daemon provides font set for local and remote X server.

xinetd
(This service may not be installed by default) it is a special service. It can launch multiple services based on specific requests received by the port. For example: A typical telnet to connect to port 23. If you have telent port 23 request detected by xinetd, xinetd will start telnetd service that responds to the request. For convenience, you can open it. Run chkconfig -list, by checking the relevant output xinetd can know what services managed by xinetd.

ypbind
For the NIS (Network Information System) client ypbind service activation process.

yppasswdd
NIS password server daemon.

ypserv
NIS master server daemon.

yum, yum-updatesd
RPM operating system updates and package management daemon.

ConsoleKit
This is mainly used for Gnome Fedora - Fast User Switching, mainly used for automatic loading device and Power Management recommendations Disable.
NetworkManager, NetworkManagerDispatcher
Switch between wired and wireless networks is mainly used for notebook, some users will use DHCP Recommendation Disable
acpid
Advanced Power Management, is installed by default in Fedora 7, if necessary can be installed
anacron, atd, cron
Linux inside the scheduled task, cron is recommended to open the other two closed
auditd
The kernel of the audit record, the equivalent of an additional loggin service, use the command to view the changes auditctl files, ordinary users do not have access can be turned off
autofs
Automatically load the file system, if you use a mobile device to open the proposal, or to turn off slightly
avahi-daemon, avahi-dnsconfd
Equivalent to a software mDNS, I do not know what to use, the proposed closure
bluetooth, hcid, hidd, sdpd, dund, pand
deamon for Bluetooth devices, you can not turn off
btseed, bttrack
BitTorrent and related services, the proposed closure
capi
And ISDN-related services, general users can shut down
cpuspeed
For the control of the CPU frequency to save power, Pentium-M, Centrino, AMD PowerNow, Transmetta, Intel SpeedStep, Athlon-64, Athlon-X2, Intel Core
2 support, or if your CPU does not support, I would like CPU running at full speed it can be switched off
cupsd, cups-config-daemon
Related services to the printer, the printer can have open
dc_client, dc_server
Mainly for SSL / TLS services, such as Apache Server, you can not use Close
dhcdbd
DHCP services, use DHCP to open people, closed with a fixed IP on the line
firstboot
For the first boot-related settings, turn off
gpm
Mouse support, if you want to use to open the console, used x-server closes
haldaemon
HAL (Hardware Abstraction Layer) that must be open
hplip, hpiod, hpssd
HP printer support program that does not make it right to turn off the HP Printer
httpd
Apache HTTP Web Server
iptables
Firewall under Linux, good Dongdong
ip6tables
IPv6 firewall, most users can be half closed the
irda, irattach
IrDA support services, many users will not spend
irqbalance
Service to users of multi-core CPU, with VMware's no need to open
isdn
ISDN users with close
kudzu
If you do not often replace the hardware to turn it off
lirc
Infrared remote control support, useless
lisa
Network Neighborhood and functions much like, if you use Samba or NFS can open
lm_sensors
Motherboard Test PC used for health services, such as CPU, hard disk temperature of something, do not be turned off
mcstrans
For viewing context, with the SELinux openable
mdmonitor
For monitoring the soft RAID and LVM information, you can also turn off
messagebus
Between IPC (Interprocess Communication) interprocess communications services, an important service, it must open
nasd
Sound support for X Windows, not on half off
netconsole
Initializes network console login, shut down
netfs
For automatically loading NFS, Samba services can be turned off without
netplugd
Monitoring network interface to use, ordinary users to switch off
nfs, nfslock
File sharing for Unix / Linux / BSD between, not just half-off
nmbd
Samba is a service for the use of name resolution NETBeui
nscd
For caching passwords, no use
ntpd
NTP service
pcscd
Support for Smart Cards pairs, do it half off
readahead_early, readahead_later
Start speed optimization program use, such as if you want to start quickly opened
restorecond
For monitoring the use of the file, if you use SELinux to open it
rpcbind
RPC support services (such as NFS or NIS). If it does not depend on the service can be switched off
rpcgssd, rpcidmapd, rpcsvcgssd
For NFS v4. Unless you use NFS v4, turn off
sendmail
Mail servers under Linux
setroubleshoot
This program provides information to setroubleshoot Browser, if you can open it with SELinux
smartd
SMART, for monitoring the hard drive, VMware users to switch off
smb
SAMBA and share files with Windows
smolt
For providing some of the statistics of every month, I do not know what to use, turn off
sshd
For SSH connection with
yum-updatesd
For online automatic upgrade, it is recommended to open
     
         
         
         
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