centos7虚拟机初始化脚本

#!/bin/bash
#**************************************************************
#Author:                     sissi
#QQ:                         1755639522
#Date:                       2020-02-29
#FileName:                   reset.sh
#URL:                        https://blog.51cto.com/14012942
#Description:                The test script
#************************************************************
#set -e
RED="\033[0;31m"
GREEN="\033[0;32m"
NO_COLOR="\033[0m"

# 修改别名
modify_alias() {
cat >> ~/.bashrc <<EOF
alias cdnet='cd /etc/sysconfig/network-scripts/'
alias editnet='vim /etc/sysconfig/network-scripts/ifcfg-ens33'
alias rm='rm -i'
alias scandisk="echo ' - - - ' > /sys/class/scsi_host/host0/scan;echo ' - - - ' > /sys/class/scsi_host/host1/scan;echo ' - - - ' > /sys/class/scsi_host/host2/scan"
EOF
}

# 修改命令提示符
modify_PS1() {
    echo 'PS1="\[\e[1;34m\][\u@\h \W]\\$\[\e[0m\] "' >> /etc/profile.d/env.sh
}

# 安装基本软件
install_software() {
    yum install   gcc gcc-c++ glibc glibc-devel pcre pcre-devel openssl  openssl-devel systemd-devel zlib-devel  vim lrzsz tree screen  lsof tcpdump wget  ntpdate net-tools iotop bc  zip unzip nfs-utils -y
}

# 替换yum源
replace_yum() {
    #wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
    curl -o /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
    sed -i -e '/mirrors.cloud.aliyuncs.com/d' -e '/mirrors.aliyuncs.com/d' /etc/yum.repos.d/CentOS-Base.repo
    #wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
    curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo
    yum makecache
}

# vim
# vimrc复制过来
modify_vimrc() {
cat > ~/.vimrc <<EOF
set ignorecase
set cursorline
set autoindent
set ai
autocmd BufNewFile *.sh exec ":call SetTitle()"

func SetTitle()
        if expand("%:e") == 'sh'
        call setline(1,"#!/bin/bash")
        call setline(2,"#**************************************************************")
        call setline(3,"#Author:                     Linus")
        call setline(4,"#QQ:                         599503252")
        call setline(5,"#Date:                       ".strftime("%Y-%m-%d"))
        call setline(6,"#FileName:                   ".expand("%"))
        call setline(7,"#URL:                        https://blog.51cto.com/14012942")
        call setline(8,"#Description:                Initialize the new server")         
        call setline(9,"#Copyright (C):              ".strftime("%Y")." Copyright ©  站点名称  版权所有")
        call setline(10,"#************************************************************")
        call setline(11,"")
        endif
endfunc
autocmd BufNewFile * normal G
EOF
}

# 关闭selinux和firewalld
iptables_selinux_stop() {
    sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config
    setenforce 0

    systemctl stop firewalld
    systemctl disable firewalld
}

# 判断是不是root
judge_root() {
    [ $(id -u) != "0" ] && { echo -e "${RED}Error:${NO_COLOR} You must be root to run this script."; exit 1; }   
}

# 判断是不是CentOS7
Check_release() {
    if [ -f /etc/redhat-release ];then
        release="centos"
        version=`sed -r 's/.* ([0-9]+)\..*/\1/' /etc/redhat-release`
    if [ "$version" = "7" ];then
        echo "Current release: CentOS7."
    else {
        echo -e "[${RED}Error${NO_COLOR}] This script can only be running on CentOS7."
        exit 1
    }
    fi
    else {
        echo -e "[${RED}Error${NO_COLOR}] This script can only be running on CentOS7."
    exit 1
    }
    fi
}

########################时区调整########################
timezone_adjust(){
    ln -sf  /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
}

#修改网卡为eth0
modify_eth_card() {
   ip a | grep -q eth0
   if [ "$?" -eq 1 ];then
       sed -ri '/^GRUB_CMDLINE/s/(.*)"/\1 net.ifnames=0"/' /etc/default/grub
       grub2-mkconfig -o /boot/grub2/grub.cfg
   fi
}

#自动补全
bash_completion() {
    yum install bash-completion -y
    source /usr/share/bash-completion/bash_completion
}

#时间同步
time_sync(){
    yum install chrony -y
    sed '/^server/s/^/#/' /etc/chrony.conf -i
    sed '1a server ntp.aliyun.com iburst' /etc/chrony.conf -i
    sed '1a server 0.cn.pool.ntp.org iburst' /etc/chrony.conf -i
    sed '1a server ntp1.aliyun.com iburst' /etc/chrony.conf -i
    systemctl restart chronyd
    systemctl enable chronyd
    # echo '*/30 * * * * /usr/sbin/ntpdate ntp.aliyun.com &>/dev/null' >> /var/spool/cron/root
}

#ssh调优
ssh_adjust(){
    cp /etc/ssh/sshd_config{,_bak}
    sed '/^GSSAPIAuthentication/d' /etc/ssh/sshd_config -i
    sed '/^UseDNS/d' /etc/ssh/sshd_config -i
    echo "GSSAPIAuthentication no" >> /etc/ssh/sshd_config
    echo "UseDNS no" >> /etc/ssh/sshd_config
    systemctl restart sshd
}

#最大文件打开数
limits_tune(){
    echo '
*   soft nofile 128000
*   hard nofile 256000

root soft nofile 128000
root hard nofile 256000
' >> /etc/security/limits.conf
}

main() {
    judge_root
    Check_release
    replace_yum
    install_software
    iptables_selinux_stop
    modify_alias
    modify_vimrc
    timezone_adjust
    time_sync
    limits_tune
    ssh_adjust 
    modify_PS1
    modify_eth_card
    bash_completion
}

main

链接：https://blog.51cto.com/14012942/2427695