CentOS7 初始化脚本 2.0

#!/bin/bash
#################################################
#  --Info
#         Initialization CentOS 7.x script
#################################################
#   Auther: [email protected]
#   Changelog:
#   20180710   wanghui  initial create
#   20190820   jiangyin update
#################################################
# set parameter
Password="password"
# Check if user is root
#
if [ $(id -u) != "0" ]; then
    echo "Error: You must be root to run this script, please use root to initialization OS."
    exit 1
fi

echo "+------------------------------------------------------------------------+"
echo "|       To initialization the system for security and performance        |"
echo "+------------------------------------------------------------------------+"

# add yunwei user
user_add()
{
  # personal user
  id -u jy
  if [ $? -ne 0 ];then
    useradd -s /bin/bash -d /home/jy -m jy && echo $Password | passwd --stdin jy && echo "jy ALL=(ALL) NOPASSWD: ALL" | sudo tee /etc/sudoers.d/jy
    else
    echo "user jy is already exist."
  fi
}

# delete useless user and group
user_del()
{
  userdel -r adm
  userdel -r lp
  userdel -r games
  userdel -r ftp
  groupdel adm
  groupdel lp
  groupdel games
  groupdel video
  groupdel ftp
}

# update system & install pakeage
system_update(){
    nameserver=`grep nameserver /etc/resolv.conf | wc -l`

    if [ $nameserver -ge 1 ];then
    echo nameserver is exist.
    else
    echo add nameserver in /etc/resolv.conf
    echo "nameserver 114.114.114.114" >>/etc/resolv.conf
    fi

    echo "*** Starting update system && install tools pakeage... ***"
    yum install epel-release -y && yum -y update
    yum clean all && yum makecache
    yum -y install vim openssh-clients iftop iotop sysstat lsof telnet traceroute tree man net-tools dstat ntpdate git egrep
    [ $? -eq 0 ] && echo "System upgrade && install pakeages complete."
}
                                                                                                                                                                                                                       
# Set timezone synchronization                                                                                                                                                                                         
timezone_config()                                                                                                                                                                                                      
{                                                                                                                                                                                                                      
    echo "Setting timezone..."                                                                                                                                                                                         
    /usr/bin/timedatectl | grep "Asia/Shanghai"                                                                                                                                                                        
    if [ $? -eq 0 ];then                                                                                                                                                                                               
       echo "System timezone is Asia/Shanghai."                                                                                                                                                                        
       else                                                                                                                                                                                                            
       timedatectl set-local-rtc 0 && timedatectl set-timezone Asia/Shanghai                                                                                                                                           
    fi                                                                                                                                                                                                                 
    # config chrony                                                                                                                                                                                                    
    yum -y install chrony                                                                                                                                                                                              
    sed -i '$a 192.168.0.205 time.aniu.so' /etc/hosts                                                                                                                                                                  
    sed -i 's/server 0.centos.pool.ntp.org iburst/server time.aniu.so iburst/g' /etc/chrony.conf                                                                                                                       
    systemctl start chronyd.service && systemctl enable chronyd.service                                                                                                                                                
    [ $? -eq 0 ] && echo "Setting timezone && Sync network time complete."                                                                                                                                             
}                                                                                                                                                                                                                      
                                                                                                                                                                                                                       
# disable selinux                                                                                                                                                                                                      
selinux_config()                                                                                                                                                                                                       
{                                                                                                                                                                                                                      
       sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/selinux/config                                                                                                                                             
       setenforce 0                                                                                                                                                                                                    
       echo "Dsiable selinux complete."                                                                                                                                                                                
}                                                                                                                                                                                                                      
                                                                                                                                                                                                                       
# ulimit comfig                                                                                                                                                                                                        
ulimit_config()                                                                                                                                                                                                        
{                                                                                                                                                                                                                      
echo "Starting config ulimit..."                                                                                                                                                                                       
cat >> /etc/security/limits.conf <<EOF
* soft nproc 8192                                                                                                                                                                                                      
* hard nproc 8192                                                                                                                                                                                                      
* soft nofile 8192                                                                                                                                                                                                     
* hard nofile 8192                                                                                                                                                                                                     
EOF
                                                                                                                                                                                                                       
ulimit -n 8192                                                                                                                                                                                                         
                                                                                                                                                                                                                       
[ $? -eq 0 ] && echo "Ulimit config complete!"                                                                                                                                                                         
                                                                                                                                                                                                                       
}                                         

# sshd config                                                                                                                                                                                                          
sshd_config(){                                                                                                                                                                                                         
    echo "Starting config sshd..."                                                                                                                                                                                     
    sed -i '/^#Port/s/#Port 22/Port 54077/g' /etc/ssh/sshd_config                                                                                                                                                      
    sed -i '/^#UseDNS/s/#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config                                                                                                                                                  
    sed -i '/^GSSAPIAuthentication/s/GSSAPIAuthentication yes/GSSAPIAuthentication no/g' /etc/ssh/sshd_config                                                                                                          
    sed -i 's/#PermitEmptyPasswords no/PermitEmptyPasswords no/g' /etc/ssh/sshd_config                                                                                                                                 
    #if you do not want to allow root login,please open below                                                                                                                                                          
    #sed -i 's/#PermitRootLogin yes/PermitRootLogin no/g' /etc/ssh/sshd_config                                                                                                                                         
    systemctl restart sshd                                                                                                                                                                                             
    [ $? -eq 0 ] && echo "SSH config complete."                                                                                                                                                                        
}                                                                                                                                                                                                                      
                                                                                                                                                                                                                       
# firewalld config                                                                                                                                                                                                     
disable_firewalld(){                                                                                                                                                                                                   
   echo "Starting disable firewalld..."                                                                                                                                                                                
   rpm -qa | grep firewalld >> /dev/null                                                                                                                                                                               
   if [ $? -eq 0 ];then                                                                                                                                                                                                
      systemctl stop firewalld  && systemctl disable firewalld                                                                                                                                                         
      [ $? -eq 0 ] && echo "Disable firewalld complete."                                                                                                                                                               
      else                                                                                                                                                                                                             
      echo "Firewalld not install."                                                                                                                                                                                    
   fi                                                                                                                                                                                                                  
}                                                                                                                                                                                                                      
                                                                                                                                                                                                                       
# vim config                                                                                                                                                                                                           
vim_config() {                                                                                                                                                                                                         
    echo "Starting vim config..."                                                                                                                                                                                      
    /usr/bin/egrep pastetoggle /etc/vimrc >> /dev/null                                                                                                                                                                 
    if [ $? -eq 0 ];then                                                                                                                                                                                               
       echo "vim already config"                                                                                                                                                                                       
       else                                                                                                                                                                                                            
     #  sed -i '$ a\set bg=dark\nset pastetoggle=' /etc/vimrc                                                                                                                                                      
       sed -i '$ a\set bg=dark' /etc/vimrc                                                                                                                                                                             
    fi                                                                                                                                                                                                                 
                                                                                                                                                                                                                       
}                                                                                                                                                                                                                      
                                                                                                                                                                                                                       
# sysctl config                                                                                                                                                                                                        
                                                                                                                                                                                                                       
config_sysctl() {                                                                                                                                                                                                      
    echo "Staring config sysctl..."                                                                                                                                                                                    
    /usr/bin/cp -f /etc/sysctl.conf /etc/sysctl.conf.bak                                                                                                                                                               
    cat > /etc/sysctl.conf << EOF
vm.swappiness = 0                                                                                                                                                                                                      
vm.dirty_ratio = 20                                                                                                                                                                                                    
vm.dirty_background_ratio = 5                                                                                                                                                                                          
fs.suid_dumpable = 0                                                                                                                                                                                                   
net.core.somaxconn = 65535                                                                                                                                                                                             
net.core.netdev_max_backlog = 262144                                                                                                                                                                                   
net.ipv4.tcp_syncookies = 1                                                                                                                                                                                            
net.ipv4.tcp_tw_recycle = 1                                                                                                                                                                                            
net.ipv4.tcp_fin_timeout = 30                                                                                                                                                                                          
net.ipv4.tcp_keepalive_time = 600                                                                                                                                                                                      
net.ipv4.tcp_max_tw_buckets = 8000                                                                                                                                                                                     
net.ipv4.tcp_tw_reuse = 1                                                                                                                                                                                              
net.ipv4.tcp_tw_recycle = 1                                                                                                                                                                                            
net.ipv4.conf.all.rp_filter = 1                                                                                                                                                                                        
EOF
                                                                                                                                                                                                                       
    /usr/sbin/sysctl -p                                                                                                                                                                                                
    [ $? -eq 0 ] && echo "Sysctl config complete."                                                                                                                                                                     
}                                                  

# ipv6 config                                                                                                                                                                                                          
disable_ipv6() {                                                                                                                                                                                                       
    echo "Starting disable ipv6..."                                                                                                                                                                                    
    sed -i '$ a\net.ipv6.conf.all.disable_ipv6 = 1\nnet.ipv6.conf.default.disable_ipv6 = 1' /etc/sysctl.conf                                                                                                           
    sed -i '$ a\AddressFamily inet' /etc/ssh/sshd_config                                                                                                                                                               
    systemctl restart sshd                                                                                                                                                                                             
    /usr/sbin/sysctl -p                                                                                                                                                                                                
}                                                                                                                                                                                                                      
                                                                                                                                                                                                                       
# password config                                                                                                                                                                                                      
password_config() {                                                                                                                                                                                                    
    # /etc/login.defs  /etc/security/pwquality.conf                                                                                                                                                                    
    sed -i 's/PASS_MIN_LEN    5/PASS_MIN_LEN    8/g' /etc/login.defs                                                                                                                                                   
    authconfig --passminlen=8 --update                   #at least 8 character                                                                                                                                         
    authconfig --passminclass=2 --update                 #at least 2 kinds of Character class                                                                                                                          
    authconfig --enablereqlower --update                 #at least 1 Lowercase letter                                                                                                                                  
    authconfig --enablerequpper --update                 #at least 1 Capital letter                                                                                                                                    
    [ $? -eq 0 ] && echo "Config password rule complete."                                                                                                                                                              
}                                                                                                                                                                                                                      
                                                                                                                                                                                                                       
# disable no use service                                                                                                                                                                                               
disable_serivces() {                                                                                                                                                                                                   
    systemctl stop postfix && systemctl disable postfix                                                                                                                                                                
    [ $? -eq 0 ] && echo "Disable postfix service complete."                                                                                                                                                           
}                                                                                                                                                                                                                      
                                                                                                                                                                                                                       
#main function                                                                                                                                                                                                         
main(){                                                                                                                                                                                                                
    user_add                                                                                                                                                                                                           
    user_del                                                                                                                                                                                                           
    system_update                                                                                                                                                                                                      
    timezone_config                                                                                                                                                                                                    
    selinux_config                                                                                                                                                                                                     
    ulimit_config                                                                                                                                                                                                      
    sshd_config                                                                                                                                                                                                        
    disable_firewalld                                                                                                                                                                                                  
    vim_config                                                                                                                                                                                                         
    config_sysctl                                                                                                                                                                                                      
    disable_ipv6                                                                                                                                                                                                       
    password_config                                                                                                                                                                                                    
    disable_serivces                                                                                                                                                                                                   
}                                                                                                                                                                                                                      
# execute main functions                                                                                                                                                                                               
main                                                                                                                                                                                                                   
echo "+------------------------------------------------------------------------+"                                                                                                                                      
echo "|            To initialization system all completed !!!                  |"                                                                                                                                      
echo "+------------------------------------------------------------------------+"                                                                         
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版权声明：本文为CSDN博主「诸葛冰玄」的原创文章，遵循 CC 4.0 BY-SA 版权协议，转载请附上原文出处链接及本声明。
原文链接：https://blog.csdn.net/embrace99999/article/details/100096797