linux系统最小化安装后的初始化脚本

时间：2022-10-21 04:22:03

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。

下面分享一个系统安装后的初始化脚本：

#!/bin/bash

#系统时最小化安装的，这里要安装系统的软件库

yum groupinstall -y "development tools"

#创建目录

[ ! -d /server/tools ] && mkdir -p /server/tools

[ ! -d /application ] && mkdir -p /application

[ ! -d /data ] && mkdir -p /data

[ ! -d /app/logs ] && mkdir -p /app/logs

[ ! -d /server/backup ] && mkdir -p /server/backup

[ ! -d /delete ] && mkdir -p /delete

#每周六凌晨1点0分更新服务器系统时间

echo "############### auto update time ###############" >> /var/spool/cron/root

echo "00 01 * * *	/usr/sbin/ntpdate time.nist.gov >/dev/null 2>&1" >> /var/spool/cron/root

[ `grep ntpdate /var/spool/cron/root |wc -l` -ne 0 ] && action "uptime set" /bin/true || action "uptime set" /bin/false

#配置yum源

wget -P /etc/yum.repos.d/ http://mirrors.163.com/.help/CentOS6-Base-163.repo #下载配置文件

/bin/mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak

/bin/cp /etc/yum.repos.d/CentOS6-Base-163.repo /etc/yum.repos.d/CentOS-Base.repo

[ `grep 163.com /etc/yum.repos.d/CentOS-Base.repo | wc -l` -ne 0 ] && action "yum set" /bin/true || action "yum set" /bin/false

#关闭SELINUX及iptables

/bin/cp /etc/selinux/config /etc/selinux/config.bak

sed -i 's/SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config 2>&1

/etc/init.d/iptables stop >/dev/null

chkconfig iptables off >/dev/null

[ `chkconfig --list |grep iptables|grep 3:on|wc -l` -eq 0 -a `grep "SELINUX=enforcing" /etc/selinux/config|wc -l` -eq 0 ] && action "iptables and selinux close" /bin/true || action "iptables and selinux close" /bin/false

#调整文件描述符数量

/bin/cp /etc/security/limits.conf /etc/security/limits.conf.bak

echo '*	-	nofile	65535'>>/etc/security/limits.conf

[ `tail -1 /etc/security/limits.conf|grep 65535|wc -l` -eq 1 ] && action "limit set" /bin/true || action "limit set" /bin/false

#更改字符集

/bin/cp /etc/sysconfig/i18n /etc/sysconfig/i18n.bak

echo 'LANG="en_US.UTF-8"' >/etc/sysconfig/i18n

#定时清理/var/spool/clientmqueue/目录下的垃圾文件，防止inodes节点被占满

##创建脚本目录

[ ! -d /server/scripts ] && mkdir -p /server/scripts

if [ `rpm -qa sendmail |wc -l` -ne 0 ];then

##创建查找删除脚本

echo >/server/scripts/del.sh<<EOF

#!/bin/bash

find /var/spool/clientmqueue/ -type f|xargs rm -f >/dev/null 2>&1

EOF

##添加到定时任务，每周一凌晨0点0分执行

echo '################ clean /var/spool/clientmqueue/ ################'　>>/var/spool/cron/root

echo '00 00 * * 1	/bin/sh /server/scripts/del.sh >/dev/null 2>&1' >>/var/spool/cron/root

[ "$?" -eq 0 ] && action "clean /var/spool/clientmqueue/ set" /bin/true || action "clean /var/spool/clientmqueue/ set" /bin/false

else

action "service sendmail is not installed,do not need set" /bin/false

fi

#精简开机自启动服务（只启动crond,sshd,network,syslog)

##筛选出所有在运行级别3自启动的服务并关闭自启动

for cgt in `chkconfig --list | grep 3:on | awk '{print $1}'`;do chkconfig --level 3 $cgt off;done

##仅设置crond,sshd,network,syslog自启动

for cgt in {crond,sshd,network,rsyslog};do chkconfig --level 3 $cgt on;done

flag=0

[ `chkconfig --list|grep 3:on|wc -l` -eq 4 ] && action "auto_start services set" /bin/true || action "auto_start services set" /bin/false

#内核参数优化

[ -f /etc/sysctl.conf.bak ] && /bin/cp /etc/sysctl.conf.bak /etc/sysctl.conf.bak.$(date +%F-%H%M%S) ||/bin/cp /etc/sysctl.conf /etc/sysctl.conf.bak

cat >> /etc/sysctl.conf <<EOF

net.ipv4.tcp_fin_timeout = 2

net.ipv4.tcp_tw_reuse = 1

net.ipv4.tcp_tw_recycle = 1

net.ipv4.tcp_syncookies = 1

net.ipv4.tcp_keepalive_time = 600

net.ipv4.ip_local_port_range = 4000 65000

net.ipv4.tcp_max_syn_backlog = 16384

net.ipv4.tcp_max_tw_buckets = 36000

net.ipv4.route.gc_timeout = 100

net.ipv4.tcp_syn_retries = 1

net.ipv4.tcp_synack_retries = 1

net.core.somaxconn = 16384

net.core.netdev_max_backlog = 16384

net.ipv4.tcp_max_orphans = 16384

#以下参数是对iptables防火墙的优化，防火墙不开会提示，可以忽略不理。

#net.ipv4.ip_conntrack_max = 25000000

#net.ipv4.netfilter.ip_conntrack_max=25000000

#net.ipv4.netfilter.ip_conntrack_tcp_timeout_established=180

#net.ipv4.netfilter.ip_conntrack_tcp_timeout_time_wait=120

#net.ipv4.netfilter.ip_conntrack_tcp_timeout_close_wait=60

#net.ipv4.netfilter.ip_conntrack_tcp_timeout_fin_wait=120

#net.netfilter.nf_conntrack_max = 25000000

#net.netfilter.nf_conntrack_tcp_timeout_established = 180

#net.netfilter.nf_conntrack_tcp_timeout_time_wait = 120

#net.netfilter.nf_conntrack_tcp_timeout_close_wait = 60

#net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 120'

EOF

sysctl -p >/dev/null 2>&1

[ `grep "net.ipv4.tcp_max_orphans = 16384" /etc/sysctl.conf|wc -l` -ne 0 ] && action "kernel set" /bin/true || action "kernel set" /bin/false

#更改默认的ssh服务端口，禁止root用户远程连接，禁止空密码连接

/bin/cp /etc/ssh/sshd_config /etc/ssh/sshd_config.bak

#sed -i 's/\#Port 22/Port 52113/' /etc/ssh/sshd_config

sed -i 's/\#PermitRootLogin yes/PermitRootLogin no/' /etc/ssh/sshd_config

sed -i 's/\#PermitEmptyPasswords no/PermitEmptyPasswords no/' /etc/ssh/sshd_config

sed -i 's/\#UseDNS yes/UseDNS no/' /etc/ssh/sshd_config

#[ `grep "Port 52113" /etc/ssh/sshd_config |wc -l` -ne 0 -a `grep "PermitRootLogin no" /etc/ssh/sshd_config|wc -l` -ne 0 -a `grep "PermitEmptyPasswords no" /etc/ssh/sshd_config|wc -l` -ne 0 -a `grep "UseDNS no" /etc/ssh/sshd_config|wc -l` -ne 0 ] &&action "ssh set" /bin/true || action "ssh set" /bin/false

[ `grep "PermitRootLogin no" /etc/ssh/sshd_config|wc -l` -ne 0 -a `grep "PermitEmptyPasswords no" /etc/ssh/sshd_config|wc -l` -ne 0 -a `grep "UseDNS no" /etc/ssh/sshd_config|wc -l` -ne 0 ] &&action "ssh set" /bin/true || action "ssh set" /bin/false

#锁定关键系统文件

chattr +ai /etc/passwd

chattr +ai /etc/shadow

chattr +ai /etc/group

chattr +ai /etc/gshadow

chattr +ai /etc/inittab

#清空/etc/issue，去除系统及内核版本登陆前的屏幕显示

/bin/cp /etc/issue /etc/issue.bak

>/etc/issue

[ `cat /etc/issue|wc -l` -eq 0 ] && action "/etc/issue set" /bin/true || action "/etc/issue set" /bin/false

自己整理的服务器安装后的初始化脚本：
下载：https://pan.baidu.com/s/1caZ3GE
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