Talk about CentOS's service.

Recently took over the mess of the company's old projects, at first I refused, but ... Refuse to have fur with t_t ...
The system used by the project is CentOS 6.5, although there are some strange phenomena and needs, but after all, has been brilliant, so, at the critical moment can only blame themselves on Linux is not enough to understand. Don't say much nonsense, first look at CentOS 6.5 what services and what they have to use it.

Service Name	function	Open By default	Recommended	Description
NetworkManager	Services to automatically connect to the network		X	Can not
Acpid	Advanced Configuration and Power management interface		0	Open, Advanced power management
Anacron	A service that automates the operation of tasks		X	than Crond advanced stuff, you don't have to.
Apmd	Advanced Power Management (legacy hardware support)		X	No, apmdacpid two, pick one.
Atd	A cron-like task scheduling system		X	Enable on demand, generally with cron
Auditd	Kernel Audit Daemon		X	It doesn't have to be seliux related.
AutoFS	CD-ROM NFSSMB automatic load unload function			Enable on Demand
Avahi-daemon	Find machines based on the ZEROCONF protocol		X	Can not
Avahi-dnsconfd	Avahi DNS Demo		X	Can not
Bluetooth	Bluetooth wireless Communication		X	Can not
Clvmd	Cluster LVM		X	Cluster-related
Cman			X	Cluster-related
Conman	Remote consoles managed by Conmand		X	Can not
Cpuspeed	Tuning CPU frequency may cause a time problem		X	Can not
Crond	and Scheduled Tasks		0	It is highly recommended to open
Cups	Print Service		X	Can not
Dnsmasq	DNS cache server		X	Can not
Dund	Supports dialup networking over Bluetooth		X	Can not
Firstboot	Initial Setup tool after system installation		X	Can not
Gfs	Global file System		X	Cluster-related
Gfs2			X	Cluster-related
gpm	Mouse support in the console environment		0	Suggest Open
Haldaemon	Implement the function of hardware automatic detection mount		0	Recommended open (dependent Messagebus service)
Hidd	Bluetooth H.I.D. Service		X	Can not
httpd	Apache			Enable on Demand
Ibmasm	IBM Hardware Management		X	Can not
Ip6tables	IPv6 firewall		X	Can not
Ipmi	Intelligent Platform Management interface can monitor system condition		X	Can not
Iptables	IPv4 Firewall			Enable on Demand
Ipvsadm	Cluster load dispersion related		X	Cluster-related
Irda	Infrared communication		X	Can not
Irqbalance	CPU Load Balancing		0	Multi-core CPU above need
Kdump	Dump memory run parameters when kernel crashes		X	Can not
Kudzu	Hardware Change Detection Program		X	Can not
Lm_sensors	CPU Temperature Detection Tool (?)		X	Can not
Luci	Cluster Service related		X	Cluster-related
Lvm2-monitor	LVM related		X	Cluster-related
Mcstrans	Used to check the context under open SELinux.		X	You can not SELinux related
Mdmonitor	Soft RAID management Tools			Enable on Demand
Mdmpd	Soft RAID Management monitoring tool			Enable on Demand
Messagebus	Responsible for passing messages between system processes		0	Open Haldaemon must
Microcode_ctl			X	Can not
Modclusterd	Cluster related		X	Can not
Multipathd	Monitor multiple path devices		X	Can not
Mysqld	MySQL Database			Enable on Demand
Named	BIND9 DNS Server			Enable on Demand
Netconsole	Initializing the network control log		X	Can not
Netfs	Installing and uninstalling the NFS, Samba, and NCP network file systems		X	Can not
Netplugd	Network Card wizard process cable Hot-swappable monitoring		X	Can not
Network	Network Services		0	Open
Nfs	NFS Network File System		X	Can not
Nfslock	NFS File Lock Daemon		X	Can not
Nscd	Name cache, names service cache daemon		X	It doesn't have to be named related.
Ntpd	Network/system Clock Sync Service		X	Can not
Oddjobd	Associated with D-bus		X	Can not
Openais	associated with cluster, heartbeat similar			Cluster-related
Pand	BlueZ Bluetooth PAN		X	Can not, Bluetooth related
Pcscd	Smart card, Card reader support		X	Can not
Piranha-gui	Associated with Cluster		X	Cluster-related
Portmap	Nfs/nis daemon for RPC dynamic port assignment		X	You can use it, NFS related
Psacct	Process Audit Daemon		X	Can not
Pulse	LVS LVM Related		X	Cluster-related
Qdiskd	Associated with Cluster		X	Cluster-related
Rdisc	Implementing the ICMP Router Discovery protocol for the client		X	Only one router can be used without
Readahead_early	Pre-loading specific applications into memory to provide performance		0	Open
Readahead_later	Ditto		X	system default Settings
Restorecond	SELinux Associated Projects		X	You can not, SELinux phase magnetic
Rgmanager	Associated with Cluster		X	Cluster-related
Ricci	Associated with Cluster		X	Cluster-related
Rpcgssd	NFS Related		X	You can use it, NFS related
Rpcidmapd	RPC Name to Uid/gid Mapper		X	You can use it, NFS related
Rpcsvcgssd	NFS Related		X	You can use it, NFS related
Saslauthd	Using the SASL authentication daemon, SendMail related		X	It doesn't have to be sendmail related.
Scsi_reserve	SCSI Persistent Reservations cluster related		X	Cluster-related
SendMail	Mail Demo			Enabled on demand, SendMail related
Setroubleshoot	View the SELinux log program, SELinux related		X	It doesn't have to be selinux related.
Smartd	The daemon for hard disk detection		0	Open
Smb	Samba File Server			Enable on Demand
Snmpd	SNMP-related			Enable on-demand, time synchronization between clusters required
Snmptrapd	SNMP-related		X	Enable on-demand, time synchronization between clusters required
Sshd	SSH Service		0	Open
Syslog	System login, log necessary procedures		0	Open
Tog-pegasus	Cluster-related		X	Can not, cluster-related
Vncserver	VNC Remote Control			Enable on Demand
Wdaemon	X a part of the World2.1 of the Web mail system, used to provide the HTTP interface client		X	Can not
Winbind	Allow UNIX systems to take advantage of Windows NT user account information, Samba-related		X	Can not
Wpa_supplicant	WIFI-WPA Certification			Enable on Demand
Xfs	X Window Font Server daemon		X	Can not
Ypbind	Network Information Service (NIS) client			Enable on Demand
Yum-updatesd	Yum Automatic upgrades			Automatic upgrades. Sometimes automatic upgrades can cause problems, especially when using PHP.