51工具盒子作为运维人员，经常会初始化系统，系统在安装过程中基本都会选择最小化安装，这样安装好的系统里会缺少很多环境。系统初始化脚本是刚安装完操作系统之后运行的脚本，主要功能是将系统环境进行优化，并更改常用设置，统一系统环境配置，其他版本可能存在差异，可以自行修改。
此脚本是系统初始化脚本，有需要朋友可以参考，脚本内容如下：
系统环境：CentOS 7.9
[root@localhost ~]# vim auto_config_system_initializ_v1.sh
脚本内容如下
#!/bin/bash
#Date：2018-5-20 13:14:00
#Author Blog:
# https://www.yangxingzhen.com
# https://www.yangxingzhen.cn
#Author WeChat：
# 微信公众号：小柒博客
#Author mirrors site:
# https://mirrors.yangxingzhen.com
#About the Author
# BY：YangXingZhen
# Mail：xingzhen.yang@yangxingzhen.com
# QQ：675583110
#Automatic configuration system initialization
source /etc/init.d/functions
System_Version=$(awk -F. '{print $1}' /etc/redhat-release \|awk '{print $NF}')
Software="lrzsz openssh-server ntp ntpdate cmake gcc gcc-c++ zlib zlib-devel openssl openssl-devel pcre pcre-devel curl rsync gd perl sysstat man mtr openssl-perl subversion nscd"
检查脚本运行用户是否为Root
===============
if \[ $(id -u) != 0 \];then
echo -e "\\033\[31mError! You must be root to run this script! \\033\[0m"
exit 1
fi
function set_config_yum () {
配置系统使用163yum源
=============
if \[ ${System_Version} -eq 7 \];then
yum -y install wget
mkdir -p /etc/yum.repos.d/bak
\\mv /etc/yum.repos.d/.repo /etc/yum.repos.d/bak
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo
yum clean all
yum makecache
else
yum -y install wget
mkdir -p /etc/yum.repos.d/bak
\\mv /etc/yum.repos.d/.repo /etc/yum.repos.d/bak
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.163.com/.help/CentOS6-Base-163.repo
yum clean all
yum makecache
fi
}
function set_install_soft (){
安装epel源
=======
yum -y install epel-release
安装bash命令tab自动补全组件
=================
yum -y install bash-completion
安装vim编辑器
========
yum -y install vim screen lrzsz tree psmisc
安装压缩解压工具
========
yum -y install zip unzip bzip2 gdisk
安装网络及性能监控工具
===========
yum -y install telnet net-tools sysstat iftop lsof iotop htop dstat
安装源码编译工具及开发组件
=============
yum -y install ${Software}
禁用不需要的服务
========
systemctl stop postfix.service
systemctl disable postfix
systemctl disable auditd
systemctl disable kdump
设置系统默认编辑器为vim
=============
grep -qw "vim" /etc/profile
\[ $? -ne 0 \] \&\& echo "alias vi=vim" \>\>/etc/profile
source /etc/profile \>/dev/null
}
function set_config_user (){
删除无效用户
======
userdel adm
userdel lp
userdel shutdown
userdel operator
userdel games
userdel uucp
删除无效用户组
=======
groupdel adm
groupdel lp
groupdel games
}
function set_config_open_file () {
修改ulimit参数
==========
\\cp /etc/security/limits.conf /etc/security/limits.conf.bak
cat \>\>/etc/security/limits.conf \<\<EOF
* soft nproc 65535
* hard nproc 65535
* soft nofile 65535
* hard nofile 65535
EOF
echo "ulimit -SHn 65535" >> /etc/profile
echo "ulimit -SHn 65535" >> /etc/rc.local
}
function set_config_ntp (){
配置时区及时间同步
=========
if \[ "`cat /etc/crontab | grep ntpdate`" = "" \]; then
echo "10 \* \* \* \* root /usr/sbin/ntpdate cn.pool.ntp.org \>\> /var/log/ntpdate.log" \>\> /etc/crontab
fi
rm -rf /etc/localtime
ln -sf /usr/share/zoneinfo/Asia/Shanghai /etc/localtime
ntpdate cn.pool.ntp.org \&\& hwclock -w
}
function set_config_sshd (){
配置SSH
=====
sed -i "s/#UseDNS yes/UseDNS no/g" /etc/ssh/sshd_config
sed -i "s/GSSAPIAuthentication yes/GSSAPIAuthentication no/g" /etc/ssh/sshd_config
}
function set_close_iptables (){
配置Selinux、Iptables(Firewalld)
=============================
if \[ ${System_Version} -eq 7 \];then
systemctl stop firewalld.service
systemctl disable firewalld.service
sed -i '/SELINUX/s/enforcing/disabled/g' /etc/selinux/config
setenforce 0
else
/etc/init.d/iptables stop
chkconfig iptables off
sed -i '/SELINUX/s/enforcing/disabled/g' /etc/selinux/config
setenforce 0
fi
}
function set_config_passwd (){
设置密码最小过期天数
==========
sed -i "/PASS_MIN_DAYS/s/0/80/" /etc/login.defs
设置密码最小长度
========
sed -i "/PASS_MIN_LEN/s/5/12/" /etc/login.defs
}
System_Value="net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.core.netdev_max_baklog = 32768
net.core.somaxconn = 32768
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.ipv4.ip_forward = 1
net.ipv4.tcp_max_syn_baklog = 65536
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 2
net.ipv4.tcp_syn_retries = 2
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_len = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_fin_timeout = 120
net.ipv4.tcp_keepalive_time = 120
net.ipv4.ip_local_port_range = 1024 65535
net.nf_conntrack_max = 16404388
net.netfilter.nf_conntrack_tcp_timeout_established = 10800
net.ipv4.tcp_max_tw_buckets = 30000
fs.file-max = 655350
kernel.sysrq = 0"
function set_config_kernel (){
配置内核参数
======
Sysctl_File="/etc/sysctl.conf"
if \[ ${System_Version} -eq 6 \];then
/etc/init.d/sshd restart
if \[ ! -f ${Sysctl_File} \];then
touch ${Sysctl_File}
fi
if \[ $(grep -wc "net.ipv4.tcp_max_tw_buckets" ${Sysctl_File}) -eq 0 \];then
echo "${System_Value}" \>${Sysctl_File}
/sbin/sysctl -p
fi
else
systemctl restart sshd.service
if \[ ! -f ${Sysctl_File} \];then
touch ${Sysctl_File}
fi
if \[ $(grep -wc "net.ipv4.tcp_max_tw_buckets" ${Sysctl_File}) -eq 0 \];then
echo "${System_Value}" \>${Sysctl_File}
/sbin/sysctl -p
fi
fi
}
function main (){
set_config_yum
set_install_soft
set_config_user
set_config_open_file
set_config_ntp
set_config_sshd
set_close_iptables
set_config_passwd
set_config_kernel
}
main
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Shell最后更新：2024-1-24
