2024年1月24日发(作者：)

CentOS 6 （6.3 mini ，安装kvm） 开机启动服务整理服务auditdcgconfigcgred

说明备注记录系统安全相关事件日志，SELinux 审核日志信息记录在off/var/log/audit/，关闭则发送至rsyslog系统资源控制，即cgroup，软件包libcgroup. 服务启动后在/cgroup/会多出off一些文件。可对cpu 、内存、网络资源进行分配。6.1以后的新功能。CGroups Rules Engine Daemon，This is a daemon for automatically

offclassifying processes into cgroups based on UID/GIDlibcgroup：Tools and libraries to control and monitor control groups。Control groups infrastructure. The tools and library help manipulate,

control,administrate and monitor control groups and the associated

and library help manipulate, control,administrate and

monitor control groups and the associated controllers.定时任务，配置文件/etc/crontab ，atd：指定时间例行工作调度。onDNS caching server，Lightweight, easy to configure DNS ，forwarder and

DHCP serve。DNS缓存服务，在访问相同网站是加快访问速度，主要用在offDNS、DHCP server 上。安装libvirt 同时被安装。The Ethernet Bridge filter tables 网桥防火墙，数据链路层，要早于off外接设备自动检测、挂载，如U盘，键盘鼠标等。Server 上一般用不上。off防火墙 offon防火墙，这个很必须。IRQ balancing daemon，a daemon that evenly distributes IRQ load acrossmultiple CPUs for enhanced performance。用于优化cpu中断分配，会自动收集系统数据以分析使用模式，并依据系统负载状况将工作至于Performance mode（将中断尽可能平均分配给各个cpu，重复利用多核，提on升性能）或 Power-save mode（将中断集中分配给第一个CPU，保证CPU充分的睡眠，降低能耗。） 状态，针对多核CPU调度。即可以提升性能，又可以降低能耗。log into iSCSI targets offOpen-iSCSI daemonoffiSCSI daemon and utility programs，The iscsi package provides the server

daemon for the iSCSI protocol,as well as the utility programs used to manage it. iSCSI is a protocolfor distributed disk access using SCSI commands sent over InternetProtocol -kvm：Kernel SamePage Merging，内核同页合并，KVM用来减少多on个相似的虚拟机的内存占用，提高内存的使用效率。对于虚拟机使用相同镜像和操作系统时，效果更加明显。在CentOS 中默认开启，在Debian 中on默认是关闭的。Userspace component of KVM，KVM (for Kernel-based Virtual Machine) is

a full virtualization solutionor Linux on x86 KVM, one can run multiple virtual machines running unmodified

Linuxor Windows images. Each virtual machine has private virtualized

hardware:libvirt-client，Client side library and utilities of the libvirt library。Shared

libraries and client binaries needed to access to the virtualization

oncapabilities of recent versions of Linux (and other OSes). 虚拟机开启、关闭

crond

dnsmasqebtableshaldaemonip6tablesiptablesirqbalance

iscsi

iscsidksmksmtuned

libvirt-guests

libvirtdmessagebuslibvirt：Library providing a simple virtualization API，exporting the

virtualization support。相当于xen 中的xend，重启kvm即重启该服务。onqemu-gaktunetunedlvm2-monitordbus：is a system for sending messages between applications. It is used

both for the system-wide message bus service, and as a per-user-login-onsession messaging td启动需要改服务。qemu-guest-agent：This package provides a qemu guest agent daemon

to be running inside of linux guests to provide the guest information. used

by libvirt to request that the guest VM suspend to disk or suspend to

: A dynamic adaptive system tuning daemon。The tuned package

contains a daemon that tunes system settings dynamically. It does so by

monitoring the usage of several system components on that information components will then be put into lower or

offhigher power saving modes to adapt to the current usage. Currently only

ethernetnetwork and ATA harddisk devices are implemented. 作为一般调节框架的固定部分Tuned是监控系统组件使用的守护进程，并可根据监控信息动态调整系统设置。在任意正常运行的给定系统中，为各种系统组件进行动态帐户调整的off方法都不尽相同lvm2：Userland logical volume management tools。逻辑卷管理工具。onoffoffoffoffoffoffmatahari-broker matahari-broker：Optional AMQP Broker for Mataharimatahari-host matahari-host：QMF agent for viewing and controlling remote hostsmatahari-network matahari-network ：QMF agent for viewing and controlling network

matahari-rpc matahari-rpc：QMF agent for dispatching RPC calls to pluginsmatahari-service matahari-service：QMF agent for viewing and controlling system servicesmatahari-sysconfigmatahari-sysconfig：QMF agent/console for providing post boot

自动bug 报告工具，只在x86和AMD64构架中完全支持红帽企业版Linux6.2中的Matahari。其它构架的构建还仍处于技术预览阶段。mdmonitormdadm：The mdadm program controls Linux md devices (software RAID

arrays)，软raid lvm 监测。The mdadm program is used to create,

manage, and monitor Linux MD (software RAID) devices. As such, it

provides similar functionality to the raidtools package. However, mdadm offis a single program, and it can perform almost all functions without a

configuration file, though a configuration file can be used to help with

some common ripts：The inittab file and the /etc/init.d scripts。The initscripts

package contains the basic system scripts used to boot your Red Hat or

Fedora system, change runlevels, and shut the system down cleanly.

Initscripts also contains the scripts that activate and deactivate most

network interfaces. It sends printk message from kernel on UDP.

netconsoleoffnetfsnetworknfsnfslockinitscripts：The inittab file and the /etc/init.d scripts。Network Filesystem

offMounter用于在系统启动时自动挂载网络中的共享文件空间，如NFS，on网络网络存储nfs 服务offnfs lock服务，主要为了防止在共享存储中，保护同一个文件多重编辑的问题.off

postfixqpiddradvd邮件服务，相当于sendmail。个人在使用sendmail中，虚拟机环境下，比较占用系统资源，而且邮件信息量大，需要定时清理。推荐使用sendEmail

offlinux 下客户端软件，很小巧，不用安装即可使用。qpid-cpp-server：An AMQP message broker daemon。A message broker

daemon that receives stores and routes messages usingthe open AMQP messaging the Qpid messaging daemon。是 offApache 开发的一款面向对象的消息中间件,Qpid 提供了很多额外的 HA 特性

radvd：A Router Advertisement daemon for IPv6 offiputils：Network monitoring tools including ping。The iputils package

contains basic utilities for monitoring a network,including ping. The ping

command sends a series of ICMP protocol ECHO_REQUEST packets to a

offspecified network host to discover whether the target machine is alive and

receiving network traffic. This is a daemon which discovers routers on the

local coreutils：SELinux policy core utilities。利用/etc/selinux/文件来判断文件selinux类型如何还原。offrdiscrestorecond

rpcbindUniversal Addresses to RPC Program Number Mapper。The rpcbind utility

is a server that converts RPC program numbers into universal addresses.

offIt must be running on the host to be able to make RPC calls on a server

on that d

nfs-utils：NFS utilities and supporting clients and daemons for the kernel

offNFS server。which provides a much higher level of performance than the

traditional Linux NFS server used by most package also

rpcidmapd

contains the showmount program. Showmount queries the mount

offdaemon on a remote host for information about the NFS (Network File

System) server on the remote host. For example, showmount can display

the clients which are mounted on that gssd

This package also contains the and gsaslauthdsshdsysstat系统日志服务 oncyrus-sasl：The Cyrus SASL library。the Simple Authentication and

Security Layer, a method for adding authentication support to connection-offbased protocols. sasl authentication server，处理明文 验证请求的服务。OpenSSH SSH daemon，ssh 远程管理服务onsysstat：The sar and iostat system monitoring commands，Sar and iostat

enable system monitoring of disk, network, and other IO activity。Reset offthe system activity logs重置系统日志，使轮询。udev：A userspace implementation of devfs。Moves the generated

persistent udev rules to /etc/udev/rules.d

offudev-postCentOS 6 使用图形化管理界面配置开启启动服务，精简服务为：crond、irqbalance、network、sshd，rsyslog，KVM相关：ksm、ksmtuned、libvirt-guests、libvirtd、mssagebus、qemu-ga。 其他服务根据需要具体设置。