Linux Service optimization

Service Control Command format

Service name control type

Service Control Commands:

Start startup

Stop Stop

Restart Restart

Reload Overloading

Status View state

optimized boot auto-load service   

Each time the Linux system is powered on, it goes to the default RunLevel and runs the various system services that are set to start in that level by default. To prevent some system services from running automatically, you can use the NTSYSV or Chkconfig tool for optimization.

NTSYSV Tools   

[*] means start [] to close if you want to know the description of the selected service, press F1 to get help.

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Chkconfig Tools

Chkconfig is similar to NTSYSV, but does not provide an interactive interface for querying or setting the default boot state of system services. Using the Chkconfig tool is more efficient when you need to set the default startup state of a service at different run levels.

Use the command chkconfig--list to view the default boot state of system services at different levels

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The on and off switch values allow you to set the default startup state of the service, which they say starts and shuts down respectively. Combined with the--level option, you can specify the corresponding runlevel. The format is as follows

Chkconfig--level Run Level list service name On|off

Service Name	Application Introduction	Note
Apmd	Advanced Power Management	Recommended to open
Atd	Postpone, perform tasks on a regular basis	Recommended Close
AutoFS	Automatic File system mounting	Recommended Close
Avahi-daemon	Discover devices that use the ZEROCONF protocol	Recommended Close
Bluetooth	Discover and certify Bluetooth related devices	Recommended Close
Anacrond	Perform scheduled tasks due to shutdown and other delays	Recommended to open
Crond	Perform scheduled tasks on a scheduled cycle	Recommended to open
Cups	Printer Services	Recommended Close
Firstboot	Perform the initialization process after installing the system	Recommended Close
gpm	Providing mouse support in text mode	Recommended to open
Haldaemon	Collect and maintain hardware information	Recommended Close
Hidd	Devices that use the Bluetooth interface	Recommended Close
Hplip	HP Linux image and print services	Recommended Close
httpd	Apache Web Site Services	Recommended Close
Ip6tables	Linux Firewall with IPv6 address	Recommended Close
Iptables	Linux Firewall with IPv4 address	Recommended Close
Irqbalance	Multi-core CPU processor scheduling support	Recommended to open
Isdn	Integrated Services Digital Network access support	Recommended Close
Kdump	Log memory information when the kernel crashes	Recommended Close
Kudzu	Configure hardware, automatically detect hardware	Recommended to open
Lvm2-monitor	LVM Logical volume management and monitoring	Recommended to open
Mctrans	Context transformation of SELinux security mechanism	Recommended Close
Mdonoitor	Soft Rald monitoring Equipment	Recommended Close
Messagebus	Send notification information about system-related events	Recommended to open
Microcde_ctl	CPU and kernel micro-code control	Recommended to open
Netfs	Access to network file systems such as shared folders	Recommended to open
Network	Configure and use the network address of the NIC	Recommended to open
Nfs	Network File System for NFS protocol access	Recommended Close
Nfslock	File lock feature for NFS access	Recommended Close
Pcscd	Smart Card Device Resource management	Recommended Close
Portmap	Provide RPC Remote Procedure call service	Recommended Close
Rawdevices	Provides mapping of raw devices to block devices	Recommended Close
Readahead_early	Provides pre-loading capabilities to speed up startup	Recommended to open
Restorecond	File monitoring and recovery function for SELinux security mechanism	Recommended Close
Rhnsd	Access Red Hat Network, get notifications, submit subscriptions, and more	Recommended Close
Rpcgssd	Managing client application Context in NFS Access	Recommended Close
Rpcidmapd	Managing user and ID mappings in NFS Access	Recommended Close
Rsync	Synchronizing files remotely	Recommended Close
Saalauthd	Text-based identity authentication	Recommended Close
SendMail	Provide mail transfer/Send function	Recommended Close
Setroubleshoot	Failure detection of selinux security mechanism	Recommended Close
Smartd	Monitor the status of local drives and send fault reports	Recommended to open
Smb	File Sharing Service	Recommended Close
Sshd	Provides the ability to telnet and manage Linux hosts	Recommended to open
Syslog	Logging of kernel and system log messages	Recommended to open
Vncserver	Provides graphical Remote Desktop access	Recommended Close
Vsftpd	File upload and download via FTP protocol	Recommended Close
Xfs	Font service for graphical interface	Recommended to open
xinetd	Super server takeover and access control program	Recommended Close
Yum_updatesd	Software Automatic Update Notification Service	Recommended Close

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