Centos7.x系统初始化

删除多余的启动项

1.查看内核程序.
rpm -qa | grep kernel
2.删除多余的内核.
yum erase 内核名称(步骤1中显示的结果中的一条或多条,不是全部 )
3.重启系统.
注: 1.需要root权限.
    2.将多余选项的删除,一般选择删除版本比较早的.

#!/bin/bash
#This script is used for CentOS7.x system initialization configuration
#Set the host name, IP address, turn off selinux, firewall, install common tools
#Modify hostname
read -p "Please enter the hostname:" hostname
if [ -z $hostname ]; then
        echo "Your hostname has not been modified!"
else
                hostnamectl set-hostname $hostname
        echo 'Your hostname is:'`hostname`
fi
#Modify host IP address
read -p "Please enter your IP address host:" HOSTIP
eth=`ip r | grep default | cut -d ' ' -f 5`
snetwork=`ip r | grep link | cut -d ' ' -f 9`
if [ -z $HOSTIP ]; then
        echo 'Your current IP is:'$snetwork
else
                nmcli connection modify $eth ipv4.method manual ipv4.addresses ${snetwork%.*}.$HOSTIP/24 ipv4.gateway ${snetwork%.*}.254 ipv4.dns ${snetwork%.*}.254 autoconnect yes
                nmcli connection up $eth
                echo 'Your IP address is:'`ip r | grep link | cut -d ' ' -f 9`
fi
#Close SELinux
if [ $(getenforce) = "Enforcing" ]; then
        setenforce 0
        sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
        echo "Selinux is closed!"
fi
#Turn off the firewall firewalld
systemctl stop firewalld.service && systemctl disable firewalld.service
#Install epel source (Alibaba Cloud)
if [ $(curl -sL -w "%{http_code}" "https://mirrors.aliyun.com/" -o /dev/null) -eq 200 ];then
        echo "The address is clear, continue to install!!!"
        rpm -ivh http://mirrors.aliyun.com/epel/epel-release-latest-7.noarch.rpm
        yum clean all
else
        echo "The address is not smooth, please check the network!!!"
        exit
fi
yum install wget bash-completion psmisc tree net-tools vim dos2unix bind-utils telnet lrzsz sysstat nmap yum-utils device-mapper-persistent-data lvm2 git ntp -y
if [ $(date | cut -d ' ' -f 5) == "CST" ]; then
        ntpdate time.windows.com
                echo "Your current time is:"`date`
else
        timedatectl set-timezone Asia/Shanghai
        ntpdate time.windows.com
fi
echo "=======================================SystemInfo=================================================="
echo 'Your hostname is:'`hostname`
echo 'Your current IP is:'`ip r | grep link | cut -d ' ' -f 9`
echo 'Your Selinux status is: ' $(getenforce)
echo 'Your current time is:'`date`

#!/bin/bash
#此脚本用于CentOS7.x系统初始化配置 V1
#设置主机名、IP地址，关闭selinux、防火墙，安装常用工具
#修改主机名
read -p "请输入主机名:" hostname
if [ -z $hostname ]; then
        echo "您的主机名未被修改！"
else
                hostnamectl set-hostname $hostname
        echo '您的主机名是：'`hostname`
fi
#修改主机IP地址
read -p "请输入您的IP地址主机:" HOSTIP
eth=`ip r | grep default | cut -d ' ' -f 5`
if [ -z $HOSTIP ]; then
        echo '您的当前IP是:'`ip r | grep link | cut -d ' ' -f 9`
else
                nmcli connection modify $eth ipv4.method manual ipv4.addresses 10.4.7.$HOSTIP/24 ipv4.gateway 10.4.7.254 ipv4.dns 10.4.7.254 autoconnect yes
                nmcli connection up $eth
                echo '您的IP地址是：'`ip r | grep link | cut -d ' ' -f 9`
fi
#关闭SELinux
if [ $(getenforce) = "Enforcing" ]; then
        setenforce 0
        sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config
        echo "Selinux已关闭!"
fi
#关闭防火墙firewalld
systemctl stop firewalld.service && systemctl disable firewalld.service
#安装epel源（阿里云）
if [ $(curl -sL -w "%{http_code}" "https://mirrors.aliyun.com/" -o /dev/null) -eq 200 ];then
        echo "地址通畅，继续安装！！！"
        rpm -ivh http://mirrors.aliyun.com/epel/epel-release-latest-7.noarch.rpm
        dnf clean all
else
        echo "地址不通畅，请检查网络！！！"
        exit
fi
yum install wget bash-completion psmisc tree net-tools vim dos2unix bind-utils telnet lrzsz sysstat nmap yum-utils device-mapper-persistent-data lvm2 git ntp -y
if [ $(date | cut -d ' ' -f 5) == "CST" ]; then
        ntpdate time.windows.com
                echo "您的目前时间是："`date`
else
        timedatectl set-timezone Asia/Shanghai
        ntpdate time.windows.com
fi
echo '您的主机名是：'`hostname`
echo '您的当前IP是:'`ip r | grep link | cut -d ' ' -f 9`
echo $(getenforce)
echo '您的当前时间是：'`date`