Linux system post-installation optimization

I learned Linux operations, after watching Oldboy video tutorial, to learn the knowledge to summarize, knowledge content are from Oldboy video tutorial.

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1. Add Users. In the enterprise product environment, should try to avoid directly to the root user operation.

Add User: Useradd Oldboy oldboy is the user name you take

Set User password: passwd oldboy (Interactive settings) or echo "*******" |passwd--stdin Oldboy

View the current user WhoAmI

User switch su-oldboy root switch to Oldboy does not require a password, which in turn needs to enter the root user's password.

2.yum source settings. Yum installs the software, the default download RPM package is the official source of foreign countries, and sometimes in order to improve the download speed, we need to change the Yum source to a domestic source.

At present, there are http://mirrors.sohu.com/and http://mirrors.163.com/of the common update sources in the domestic fast speed.

The code is as follows:

CD/ETC/YUM.REPOS.D entering the catalogue

/BIN/MV Centos-base.repo Centos-base.repo.ori backup

wget http://mirrors.sohu.com/help/CentOS-Base-sohu.repo Download

/BIN/MV Centos-base-sohu.repo Centos-base.repo Replacement

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3. Install the necessary packages

Yum Install Lrzsz sysstat-y installation

Rpm-qa sysstat lrzsz View

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4. Turn off SELinux. SELinux is a security mechanism in Linux systems that can sometimes cause a lot of trouble for users.

Sed-i ' s/selinux=enforcing/selinux=disabled/' etc/selinux/config modified

grep selinux=disabled/etc/selinux/comfig Confirm the modification is complete (develop good habits)

Setenforce 0 Provisional effective order

Getenforce View selinux status

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5. Set RunLevel to 3. Run level settings

grep 3:initdefault Etc/inittab

Id:3:initdefault

Linux runs at six levels (0-6)

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6. Streamline boot up.

Setup brings up the Setup window, sets the startup item in system services, or directly enters the NTSYSV command to bring up the Startup Item Settings window in System services.

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Complete the script directly, close all the startup items, and then open the service that you want to boot.

lang=en convert characters to avoid garbled display

For Oldboy in ' chkconfig--list|grep 3:on|awk ' {print '} ';d o chkconfig--level 3 $oldboy

Off;done shutdown more services with boot-up

For Oldboy in Crond network syslog sshd;d o chkconfig – Level 3 $oldboy On;done

Set up Crond network syslog sshd four service boot

Chkconfig--list|grep 3:on View

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Linux system post-installation optimization