Detailed explanation of CentOS7 system initialization settings

The following tutorial column of centos will introduce you to the CentOS7 system initialization settings. I hope it will be helpful to friends in need!

CentOS7 system initialization settings

March 07, 2019
System version: CentOS Linux release 7.3-1611

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1. Network configuration

Use the nmtui graphical tool to configure the IP address and host name

IP：192.168.82.103/24  
主机名：leanote.jmkf.com

You can also change the configuration file

[root@leanote ~]# vi /etc/sysconfig/network-scripts/ifcfg-ens32

TYPE=Ethernet
BOOTPROTO=none
DEFROUTE=yes
IPV4_FAILURE_FATAL=no
IPV6INIT=yes
IPV6_AUTOCONF=yes
IPV6_DEFROUTE=yes
IPV6_FAILURE_FATAL=no
IPV6_ADDR_GEN_MODE=stable-privacy
NAME=ens32
UUID=eb220f0e-779d-48c6-8e1b-093b2f9eff0f
DEVICE=ens32
ONBOOT=yes
IPADDR=192.168.55.58
PREFIX=24
IPADDR1=192.168.82.103
PREFIX1=24
GATEWAY=192.168.82.254
DNS1=192.168.94.201
IPV6_PEERDNS=yes
IPV6_PEERROUTES=yes

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2. Turn off the firewall

2.1 Check the firewall

#　systemctl status firewalld.service

[root@leanote ~]# systemctl status firewalld.service

● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
   Active: active (running) since 五 2017-12-29 12:10:34 CST; 3s ago
     Docs: man:firewalld(1)
 Main PID: 11473 (firewalld)
   CGroup: /system.slice/firewalld.service
           └─11473 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid

12月 29 12:10:33 leanote.jmkf.com systemd[1]: Starting firewalld - dynamic firewall daemon...
12月 29 12:10:34 leanote.jmkf.com systemd[1]: Started firewalld - dynamic firewall daemon.

- 此状态表示防火墙处于开启状态 -

2.2 Turn off the firewall

#　systemctl stop firewalld.service

[root@leanote ~]# systemctl stop firewalld.service

[root@leanote ~]# systemctl status firewalld.service

● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; disabled; vendor preset: enabled)
   Active: inactive (dead)
     Docs: man:firewalld(1)

12月 29 12:10:33 leanote.jmkf.com systemd[1]: Starting firewalld - dynamic firewall daemon...
12月 29 12:10:34 leanote.jmkf.com systemd[1]: Started firewalld - dynamic firewall daemon.
12月 29 13:43:31 leanote.jmkf.com systemd[1]: Stopping firewalld - dynamic firewall daemon...
12月 29 13:43:31 leanote.jmkf.com systemd[1]: Stopped firewalld - dynamic firewall daemon.

- 此状态表示防火墙处于关闭状态 -

2.3 Disable the firewall from starting at boot

#　systemctl enable firewalld.service　　　 启用  
#　systemctl disable firewalld.service　　　禁用

[root@leanote ~]# systemctl enable firewalld.service

Created symlink from /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service to /usr/lib/systemd/system/firewalld.service.
Created symlink from /etc/systemd/system/basic.target.wants/firewalld.service to /usr/lib/systemd/system/firewalld.service.

-----------------------------------------------------------------------------------------------------------------

[root@leanote ~]# systemctl disable firewalld.service

Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.

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3. Close SELINUX

[root@leanote ~]# setenforce 0　　　　　　临时关闭

Permanently close the configuration file that needs to modify SELINUX/etc/selinux/config

将SELINUX=enforcing 改为 SELINUX=disable

[root@leanote ~]# vi /etc/selinux/config  

# This file controls the state of SELinux on the system.
# SELINUX= can take one of these three values:
#     enforcing - SELinux security policy is enforced.
#     permissive - SELinux prints warnings instead of enforcing.
#     disabled - No SELinux policy is loaded.
#SELINUX=enforcing
SELINUX=disable
# SELINUXTYPE= can take one of three two values:
#     targeted - Targeted processes are protected,
#     minimum - Modification of targeted policy. Only selected processes are protected.
#     mls - Multi Level Security protection.
SELINUXTYPE=targeted

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4. Change the YUM source

You can choose Alibaba Cloud, NetEase Cloud, other websites or intranet yum sources
Back up the files under /etc/yum.repos.d/ and download the corresponding repo files

https:// opsx.alibaba.com/mirror

4.1 Backup

Back up all

# mkdir /etc/yum.repos.d/bak
# mv /etc/yum.repos.d/* /etc/yum.repos.d/bak

or only back up the CentOS-Base.repo file

# mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

4.2 Download the new CentOS-Base.repo to /etc/yum.repos.d/

CentOS 5

# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo
或者
# curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo

CentOS 6

# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo
或者
# curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

CentOS 7

# wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
或者
# curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

4.3 Configure epel source

epel(RHEL 7)
	wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

epel(RHEL 6)
	wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo

epel(RHEL 5)
	wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-5.repo

4.4 Run yum makecache to generate cache

# yum clean all
# yum makecache
# yum repolist

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5. Basic software Tool installation

Install common software and tools through the configured YUM library

# yum install -y vim
# yum install -y wget
# yum install -y lrzsz

Minimal installation without ifconfig command solution

# yum search ifconfig
# yum install -y net-tools
# yum provides ifconfig

Command paste

nmtui

systemctl stop firewalld.service
systemctl disable firewalld.service

setenforce 0
vi /etc/selinux/config
SELINUX=disable

mkdir /etc/yum.repos.d/bak
mv /etc/yum.repos.d/* /etc/yum.repos.d/bak
curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo

yum clean all
yum makecache
yum repolist

yum install -y vim
yum install -y wget
yum install -y lrzsz
yum install -y net-tools

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