CentOS Common Services

Acpid power management can reduce energy consumption and save power by suspending unnecessary devices, reducing the CPU frequency or other methods.
Apmd-apmd is used to monitor the power usage status of the system and write related information to logs through syslogd. It can also be used to shut down when the power supply is insufficient.
Arpwatch-used to maintain the ing between physical Ethernet addresses and IP addresses
Anacron does not consider cron services during system downtime
Atd -- run the task scheduled by the user using the at command. Run the batch processing task when the system load is low.
Autofs -- the file system is automatically reprinted when you need it, and is automatically uninstalled when you do not need it.
Chargen -- tcp chargen server
Chargen-udp -- udp chargen server
Crond: periodically runs user-scheduled tasks. Compared with the traditional unix version, many attributes are added, which are safer and easier to configure.
Daytime -- tcp-version daytime server
Daytime-udp -- udp-version daytime server
Echo -- tcp echo server
Echo-udp -- udp echo server
Eklogin-a service that accepts rlogin session authentication and uses kerberos5 Encryption
Finger -- service used to respond to finger requests
Gpm -- provides mouse support for linux programs in text mode. It also supports console mouse copying, pasting, and pop-up menus (required)
Gssftp-accept ftp connections that can be verified by os5
Httpd -- http is a famous www server and can be used to provide html files and cgi Dynamic Content Services
Identd -- provides authentication methods
Ipchains-ipchains packet filtering Firewall
Iptables -- iptables packet filtering Firewall
Ipvsadm -- call ipvsadm to establish and maintain the ipvs route selection table
Isdn-enable the isdn (Integrated Service Digital Network) Service
Kadmin -- change the kadmin tool of the local host in the master kdc or use the kadmin service.
Kdcrotate -- set the kdcs table item in the configuration file/etc/krb5.con.
Keytable -- the function of this program is to record the keyboard ing table described in/etc/sysconfig/keyboards.
Klogin -- accept the rlogin session in bsd mode, but use kerbeos5 for verification.
Kprop -- whether to allow kdc to receive master kdc upgrades
Krb5-telnet-allows normal telnet login, but can also be verified using login os5
Krb524 -- indicates the certificate used to change os5 to ossiv.
Krb5kdc -- enable the connection required by kerberosIV and 5 to obtain the license
Kshell-services that accept rshell command authentication and use kerberos Encryption
Kudzu-runs hardware detection and can selectively set hardware changes
Lpd-lpd is the system print daemon, responsible for submitting lpr and other programs to print jobs
Netfs-responsible for loading/detaching nfs, samba, and ncp file systems
Network -- activate/disable various network interfaces at startup (required)
Nfs-nfs is a popular File sharing protocol based on TCP/IP network. This service provides the nfs File sharing service (nfs: Net File System, short for Network File System.
NFS allows a system to share directories and files with its users on the network. By using NFS, users and programs can access files on the remote system just like accessing local files.
Nfslock-provides the nfs file lock function
Nscd-this service queries passwords and groups and caches query results
Portmap -- portmap is used to support rpc connections. rpc is used for nfs, nis, and other services.
Postgresql-postgresql Relational Database Engine
Random-high-quality random number generator for saving and restoring the system. These random numbers are provided by some random behaviors of the system.
Rlogin-rlogin program service, which provides registration functions from remote Trusted Hosts
Routed -- this daemon supports automatic ip route table maintenance of the rip Protocol. rip is mainly used on small networks, and a larger network requires
More complex protocols
Rsh-provide services for rcmd or rsh programs
Rstatd-The rstat protocol allows users on the network to obtain the performance parameters of each machine on the same network.
Rsync-a good addition to the ftp service, allowing round robin code sum verification and so on
Rusersd-This service allows network users to locate other users on the same network
Rwalld-rwall protocol allows remote users to send messages to active terminals in the same system, similar to the local behavior of wall
Rwhod-allows remote users to obtain a list of all logged-on users on machines running the rwho genie, similar to finger
Smb -- start and close the smbd and nmbd genie programs to provide smb Network Services
Snortd-a lightweight network intrusion detection tool
Swat-samba Network Configuration tool, which can be connected to swat through port 901 of the browser
Syslog-syslog is a mechanism provided by the operating system. The Daemon usually uses this mechanism to write various information to the log files of various systems (required)
Telnet-provides the telnet service and uses unencrypted user/password groups for verification.
Time -- rfc 868 time server of tcp version
Time-udp version of rfc 868 time server
Webmin-webmin is a powerful web-based management tool that combines system management and network management.
Xfs -- starts and stops the x Font Service during boot and shutdown, and may regenerate the font table (required)
Xinetd -- Internet operation service program. It provides functions similar to inetd + tcp_wrapper, but is more powerful and secure,
The monitoring network needs various services managed by it, and starts corresponding service programs as needed
Ypbind-server that implements Network Information Services