Quid interest inter CentOS6.5 et 7?Quid de versione CentOS7 eligendo?

CentOS Maxima differentia est inter 7 et 6 differentiam in arte initialization.

• Technologia initialisatio a CentOS 7 adhibita est Systemd.
• Praeterea officium startup, files startup, mandata retiacula, etc., omnes differentias ab VI ostendunt.

Nos primum intellegamus Linux Evolutio systematis technologiae CentOS initialization!

XNUMX. Ratio initialization technology

1. Sysvinit Technology
2. Technology upstart
3. Systemd technology

Sysvinit Technology

.

• 1) Primus processus systematis est init;
• 2) Processus initialis est processus omnium processuum parens ac necari potest (occidi);
• 3) Pleraque Linux systemata initorum compatiuntur cum SystemV, nomine sysvinti .
• 4) Systema Repraesentativa: CentOS 5 CentOS 6

Italiae Commodum Collegit:

• Sysvinit bene operatur et conceptus simplex et clarus est.
• Plerumque pendet in testa scripting.

Infirmitas:

• 1) Satus nimis tardus est.
• 2) Perfacile pendere, fstab et NFS quaestiones montis.

Technology upstart

CentOS 6 utitur SysVinit loco technicae artis tabernus.

Scriptum upstart rc.sysinit multas optimizationes habet ad redigendum systema initialization satus tempus.

Tamen, ut res pro administratoribus simpliciorem reddant, CentOS 6 non exaggerat nec omnino sustinet multas novas rationes.

Systema Repraesentativas:CentOS VI, Decuria XIIII.

• systemd adhibetur cum CentOS 7, Ubuntu15.

Systemd technology

Technologiae in novis systematibus adhibitae (RedHat7, CentOS 7, Ubuntu15, etc.)

• Propositum consilium est originalis defectus sysvinitorum solvere et efficaciter systema celeritatis startup emendare;
• Compatible cum Sysvinit, sumptus transferens;

Pelagus commodum;

1. parallel initium
2. Processus processus usura PID I "

XNUMX. Optimization de fonte yum

In CentOS VI, defalta est rpm fasciculos ex officialibus fontibus detrahere.

• CentOS 7 hic optimized est propter tardam celeritatem utendi opibus alienis.
• cum utimur install软件non diutius ex rutrum defaltam.
• Sed statim inveniet fontem Yum proximum suum locum orbis terrarum ut satus downloading.

XNUMX. Mandatum

Si vis minimam (minimum) cum inaugurari, in minore sarcina quam ante versiones instituetur.Exempli gratia: VIM, utere ifconfig, iter fundere, figere ad parametri, netstat, etc.Multa mandata abierunt.

Post institutionem systematis fasciculi sequentes addi possunt:

yum install lrzsz tree net-tools nmap vim bash-completion lsof dos2unix nc telnet ntp wget rng-tools psmisc screen -y
#lrzsz
 支持用于上传和下载linux的windowns平台。
 可以在windowns远程连接工具上使用。
#net-tools
 CentOS  7.2.11
 默认没有ifconfig命令。网络工具提供了一些网络命令。
#bash-completion
 自动命令完成工具。
#rng-tools
 生成随机数字池的工具。
 有了这个工具，tomcat启动速度非常快。
#psmisc
 这包含killall命令。
#screen
 创建一个新窗口并将任务置于后台。

Quarto, character posuit modificationem

Mores Set Profile ▼

/etc/locale.conf 

Praeceptum lineae in uno gradu tantum positae est

[root@CentOS 7 ~] # localectl set-locale LANG = zh_CN.UTF-8
[root@CentOS 7 ~] # localectl status
System Locale: LANG=zh_CN.UTF-8
VC Keymap: us
X11 Layout: us

XNUMX. Satus procuratio

/etc/rc.local 

Hic fasciculus adhuc exstat, sed si velimus hac methodo utens permanere, necesse est ut eam ▼

chmod +x /etc/rc.d/rc.local

View Scheduled Negotium Status ▼

systemctl status crond.service

Prope accedant opera ▼

systemctl stop crond.service

Operationem rei videre ▼

systemctl status crond.service

View currently currentem officia ▼

systemctl list-unit-files|grep enable 

Inactivare Mail Service ▼

systemctl disable postfix.service

Reprehendo si mail ministerium enabled ▼

systemctl list-unit-files|grep postfix

Averte firewall ▼

systemctl stop firewalld.service

Initium muneris ▼

systemctl is-enable

# Prope ministerium ▼

systemctl disable

Initium /etc/rc.d/rc.local/:

/etc/rc.d/rc.local in CentOS 7 necessarios ad haec mandata exequenda, ut permissiones exsecutabiles ▼.

chmod +x /etc/rc.d/rc.local

Sex, runlevel (currere gradu)

/etc/inittab invalidum est ratio scopum replacement

• Semper valet pro proximo login

switch ad V ▼ *

systemctl get-default graphical.target

switch ad V ▼ *

systemctl get-default multi-user.target

Ad tempus efficax ▼

INIT3

Tantum quinque runlevels ▼

[root@centos7 ~]# ls -lh /usr/lib/systemd/system/runlevel*.target
lrwxrwxrwx. 1 root root 15 Mar 20 22:31 /usr/lib/systemd/system/runlevel0.target -> poweroff.target
lrwxrwxrwx. 1 root root 13 Mar 20 22:31 /usr/lib/systemd/system/runlevel1.target -> rescue.target
lrwxrwxrwx. 1 root root 17 Mar 20 22:31 /usr/lib/systemd/system/runlevel2.target -> multi-user.target
lrwxrwxrwx. 1 root root 17 Mar 20 22:31 /usr/lib/systemd/system/runlevel3.target -> multi-user.target
lrwxrwxrwx. 1 root root 17 Mar 20 22:31 /usr/lib/systemd/system/runlevel4.target -> multi-user.target
lrwxrwxrwx. 1 root root 16 Mar 20 22:31 /usr/lib/systemd/system/runlevel5.target -> graphical.target 
lrwxrwxrwx. 1 root root 13 Mar 20 22:31 /usr/lib/systemd/system/runlevel6.target -> reboot.target

Septem, configurare yum source code

wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

Official EPEL source ▼

wget http://dl.fedorMaroject.org/pub/epel/epel-release-latest-7.noarch.rpm
rpm -ivh epel-release-latest-7.noarch.rpm