Understand and optimize common Linux system services

Common Linux System Services

The Linux system contains a large number of service programs that have RC scripts to start or terminate according to the preset state when switching the runlevel. Some of these system services may not be required by the user, but they are also run by default, and only a proper understanding of the purpose of each system service can be used to selectively optimize operations and enable Linux server systems on demand.

Service Name	Application Introduction	Note
Atd	Deferred, scheduled execution of tasks	Recommended Close
AutoFS	Automatic File system mounting	Recommended Close
Bluetooth	Discover and certify Bluetooth related devices	Recommended Close
Anacrond	Perform scheduled tasks due to shutdown and other delays	Recommended Close
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
Haldaemon	Collect and maintain hardware information	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	Scheduling support for multi-core CPU processors	Recommended to open
Kdump	Log memory information when the kernel crashes	Recommended Close
Lvm2-monitor	LVM Logical volume management and monitoring	Recommended to open
Messagebus	Send notification information about system-related events	Recommended to open
Netfs	Access to network file systems such as shared folders	Recommended to open
Network	Configure and use the network card, Internet address	Recommended to open
Nfs	Network File System for NFS protocol access	Recommended Close
Nfslock	File lock feature for NFS access	Recommended Close

Restorecond	File monitoring and recovery capabilities for SELinux security	Recommended Close
Rhnsd	Access Red Hat Network for notifications, submit subscriptions, and more	Recommended Close
Rpcgssd	Managing the client Context in NFS Access	Recommended Close
Saslauthd	Text-based identity authentication	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
Rsyslog	Logging of kernel and system log messages	Recommended to open
Vsftpd	File upload, download via FTP protocol	Recommended Close
Note: These services are turned on and off, need to be based on the actual function of the host needs to be fixed, do not mechanically!!!

optimized boot auto-load service

NTSYSV Tools : Provides an interactive, visual window that can be run at the character terminal for centralized management of multiple services

Execute the "NTSYSV" command alone to manage services at the current RunLevel

Execute the "ntsysv--level 35" command while managing the service at Run Level 3, 5

chkconfig Tools: no Interactive, visual windows, more efficient management of individual services

Chkconfig--list View the default boot status for all services

chkconfig--list Service name to view the default startup state for a specified service

Set the default startup state for system services

Execution format: Chkconfig--level level list service name On|off

This article is from the "Yang Shufan" blog, make sure to keep this source http://yangshufan.blog.51cto.com/13004230/1945264

Understand and optimize common Linux system services