Introduction to Linux daemon

This article introduces the default installation of rhel5.1 after/etc/rc. d/init. the startup scripts of various services in the d directory are arranged in the alphabetical order of acpid: ACPI advanced configuration and power management interface anacron: a scheduling tool in Linux, similar to cron, if you do not need to turn off apmd: apm advanced power...

This article describes the startup scripts of various services in the/etc/rc. d/init. d directory after rhel 5.1 is installed by default.
Acpid: ACPI advanced configuration and power management interface
Anacron: a scheduling tool in Linux, similar to cron. you can disable it unless necessary.
Apmd: apm advanced power management. if acpid is enabled, apmd does not need to be enabled. ACPI can be disabled instead of apmd.
Atd: a service that supports at commands.
Auditd: the service process used in Linux to record users' underlying calls and audit
Autofs: automatically mounts the management process. you can disable it if you do not need.
Avahi-daemon and avahi-dnsconfd: avahi is the implementation of zeroconf protocol. you can find zeroconf-based devices and services in the Lan without DNS services, unless there are compatible devices, otherwise it is recommended to disable
Bluetooth: used to search for signals from bluetooth devices and can be disabled.
Capi: it is useful for users who use ISDN devices and can be disabled.
Conman: console management program that supports a large number of console devices, including local serial devices, telnet remote terminal servers, Unix sockets, and external processes.
Cpuspeed: used to dynamically adjust cpu usage to save energy. if you want the cpu to run at a fixed frequency, you can disable it.
Crond: the task plan in Linux. it is recommended to enable it if it is started for a long time.
Cups, cups-config-daemon: Printer-related services, no need to disable
Dhcdbd: enables the guest system to control DHCP interfaces.
Dund: Supports network connection through Bluetooth dial-up
Firstboot: after the system is installed, it is guided to the graphic interface for initialization settings for the first time. depending on this service, you can disable it.
Functions: Linux system public shell function library
Gpm: Terminal mouse pointer support
Haldaemon: In the graphic interface, hal automatically mounts mobile devices. you can disable it and then manually Mount mobile devices.
Halt: shut down and call the halt script
Hidd: provides support for bluetooth input devices such as the keyboard and mouse. it must be used with bluetooth to turn it off.
HP printer support in Linux. If no compatible printer is available, disable it.
Ip6tables: a software firewall that supports IPv6. If IPv6 is not supported, disable it.
Ipmi: supports remote configuration, monitoring, and recovery of the system, and requires hardware support from the server.
Iptables: a software firewall that supports IPv4. you do not need to disable it.
Irda: provides communication support between infrared devices and can be disabled.
Irqbalance: in a multi-processor, this service can improve system performance.
Isdn: Integrated Service Digital Network, an Internet access method that does not need to be closed
Kdump: A crash dump mechanism for kernel development.
Killall: directly kill all processes by program name
Krb524: The kerberos verification service is switched, and the verification from os5 to OS4 is changed.
Kudzu: an automatic hardware monitoring program that automatically monitors changes in hardware. for example, you can add new hardware to enable automatic configuration of hardware information during startup.
Lisa: Lan Information Service. for example, to scan a Lan host in KDE, you must enable lisa or reslisa.
Lm_sensors: used to detect the value of the sensor on the motherboard, such as temperature, frequency, and voltage, to facilitate the determination of machine health.
Lvm2-monitor: used for logical volume management
Mcstrans: it is related to SELinux. if SELinux is used, enable
Mdmonitor: used for md devices in Linux. you do not need to disable it.
Mdmpd: used to monitor multi-path access devices. this storage device can be accessed by multiple controllers and can be disabled.
Messagebus: Inter-process communication service
Microcode_ctl: allows inter CPUs to use plug-in micro-instruction sets to provide system operation and disable
Multipathd: uses the multi-path function and mainly works with the storage environment.
Netconsole: Allows you to send kernel printk messages to a remote host for storage.
Netfs: Allows you to mount and detach network disks.
Netplugd: used to monitor network interfaces and execute specified commands when the interface status changes
Network: A Linux network service that provides ip addresses, gateways, masks, and host names.
NetworkManager and NetworkManagerDispatcher: Automatically switches back-end processes connected to the network to implement switching between different networks.
Nfs: Network File System Service
Nfslock: the nfs lock function prevents different users from simultaneously modifying the same file provided by nfs
Nscd: queries passwords and groups, and caches query results.
Ntpd: the service of the network time server, which provides the client synchronization time
Pand: allow Ethernet connection via Bluetooth
Pcscd: supports smart card and smart card readers.
Portmap: provides RPC for NFS and NIS
Psacct: audits and tracks abnormal activities in Linux
Rdisc: daemon for route discovery
Readahead_early, readahead_later: loads some programs into the memory at startup, facilitating fast loading and accelerating startup.
Restorecond: used to monitor SELinux and reload the correct file security environment
Rhnsd: redhat network service
Rpcgssd, rpcidmapd, rpcsvcgssd: used for NFS v4
Salauthd: sasl authentication daemon
Sendmail: sendmail system daemon process
Setroubleshoot: selinux troubleshooting
Single: single-user mode
Smartd: monitoring disk status
Sshd: a secure connection method commonly used to remotely connect to a server
Syslog: records information generated by the system.
Vncserver: Provides Remote Desktop Connection in linux
Winbind: samba name server
Wpa_supplicant: wireless device support
Xfs: X window font service
Ypbind: provides the nis service
Yum-updatesd: rpm automatic upgrade and software package management service