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  Linux Services Comments
  Add Date : 2018-11-21      
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.

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.

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 network for users to control daemon filtering.

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

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.

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.

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.

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.

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

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

Using the UDP protocol chargen server.



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

cvs is a version control system.

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 use UDP protocol daemon.


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.

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.


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 client server data service daemon.
UDP protocol server echo client data service daemon.

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


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.


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.

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.

Use kerberos 5 certified ftp daemon.


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.

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

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

Usenet news server daemon.

Chinese input method server daemon.

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.

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.

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.

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.

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

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.


Telnet daemon.

Use kerberos 5 certified telnet daemon.

kshell daemon.

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


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.

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

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

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.

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.

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

DNS (BIND) server daemon.


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.

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.

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.

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.

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.

Mainly used to support notebook computer interface daemon.

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

PostgreSQL relational database engine.

ADSL connection daemon.

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

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

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

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

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.

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.

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

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.

remote sync remote data backup daemon.

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

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

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

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.

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

Use SASL authentication daemon.

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.

See selinux logs program

Squid proxy server daemon.

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.

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.

Local Simple Network Management daemon.

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.


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

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

Apache server daemon running in the Linux kernel.

Vsftpd server daemon

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

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

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.

Wireless LAN Internet Services

xend, xendomains
XEN virtual service-related

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

(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.

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

NIS password server daemon.

NIS master server daemon.

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

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
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
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
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
And ISDN-related services, general users can shut down
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
DHCP services, use DHCP to open people, closed with a fixed IP on the line
For the first boot-related settings, turn off
Mouse support, if you want to use to open the console, used x-server closes
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
Apache HTTP Web Server
Firewall under Linux, good Dongdong
IPv6 firewall, most users can be half closed the
irda, irattach
IrDA support services, many users will not spend
Service to users of multi-core CPU, with VMware's no need to open
ISDN users with close
If you do not often replace the hardware to turn it off
Infrared remote control support, useless
Network Neighborhood and functions much like, if you use Samba or NFS can open
Motherboard Test PC used for health services, such as CPU, hard disk temperature of something, do not be turned off
For viewing context, with the SELinux openable
For monitoring the soft RAID and LVM information, you can also turn off
Between IPC (Interprocess Communication) interprocess communications services, an important service, it must open
Sound support for X Windows, not on half off
Initializes network console login, shut down
For automatically loading NFS, Samba services can be turned off without
Monitoring network interface to use, ordinary users to switch off
nfs, nfslock
File sharing for Unix / Linux / BSD between, not just half-off
Samba is a service for the use of name resolution NETBeui
For caching passwords, no use
NTP service
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
For monitoring the use of the file, if you use SELinux to open it
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
Mail servers under Linux
This program provides information to setroubleshoot Browser, if you can open it with SELinux
SMART, for monitoring the hard drive, VMware users to switch off
SAMBA and share files with Windows
For providing some of the statistics of every month, I do not know what to use, turn off
For SSH connection with
For online automatic upgrade, it is recommended to open
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