centos系统初始化脚本

时间：2022-02-14 02:25:35
#!/bin/bash

#检测是否为root用户

if [ $UID -ne  ];then

        echo "Must be root can do this."

        exit

fi

#检测网络

echo "检测网络中......"

/bin/ping www.baidu.com -c  &>/dev/null

if [ $? -ne  ];then

        echo "现在网络无法通信，准备设置网络"

        read -p 'pls enter your ip: ' IP

        read -p 'pls enter your gateway: ' GW

        read -p 'pls enter your netmask: ' NM

        read -p 'pls enter your netcard: ' NC

        echo "IPADDR=$IP" >> /etc/sysconfig/network-scripts/ifcfg-$NC

        echo "NETMASK=$NM" >> /etc/sysconfig/network-scripts/ifcfg-$NC

        echo "GATEWAY=$GW" >> /etc/sysconfig/network-scripts/ifcfg-$NC

        echo "DNS1=114.114.114.114" >> /etc/sysconfig/network-scripts/ifcfg-$NC

        echo "DNS2=8.8.8.8" >> /etc/sysconfig/network-scripts/ifcfg-$NC

        sed -i 's/dhcp/static/g' /etc/sysconfig/network-scripts/ifcfg-$NC

        sed -i 's/ONBOOT=no/ONBOOT=yes/g' /etc/sysconfig/network-scripts/ifcfg-$NC

        /etc/init.d/network restart

        echo -e "\033[031m network is configure ok.\033[0m"

else

        echo -e "\033[031m network is ok.\033[0m"

fi

#关闭 ctrl + alt + del

echo "关闭 ctrl + alt + del ......."

sed -i "s/ca::ctrlaltdel:\/sbin\/shutdown -t3 -r now/#ca::ctrlaltdel:\/sbin\/shutdown -t3 -r now/" /etc/inittab

sed -i 's/^id:5:initdefault:/id:3:initdefault:/' /etc/inittab

#关闭ipv6

echo "关闭IPv6....."

echo "alias net-pf-10 off" >> /etc/modprobe.conf

echo "alias ipv6 off" >> /etc/modprobe.conf

/sbin/chkconfig --level  ip6tables off

echo -e "\033[031m ipv6 is disabled.\033[0m"

#关闭selinux

echo "关闭SElinux......"

sed -i '/SELINUX/s/enforcing/disabled/' /etc/selinux/config

echo -e "\033[31m selinux is disabled,if you need,you must reboot.\033[0m"

#更新yum源

echo "备份yum源......"

mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.backup

sys_ver=`cat /etc/redhat-release |awk '{print $3}' | awk -F '.' '{print $1}'`

if [ $sys_ver -eq  ];then

        wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo

        yum clean all

        yum makecache

elif [ $sys_ver -eq  ];then

        wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo

        yum clean all

        yum makecache

elif [ $sys_ver -eq  ];then

        wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-5.repo

        yum clean all

        yum makecache

fi

#安装基础库

echo "安装基础环境和库......"

yum -y install gcc gcc-c++ autoconf libjpeg libjpeg-devel libpng libpng-devel freetype freetype-devel libxml2 libxml2-devel zlib zlib-devel glibc glibc-devel glib2 glib2-devel bzip2 bzip2-devel ncurses ncurses-devel curl curl-devel e2fsprogs e2fsprogs-devel krb5-devel libidn libidn-devel openssl openssl-devel nss_ldap openldap openldap-devel  openldap-clients openldap-servers libxslt-devel libevent-devel ntp  libtool-ltdl bison libtool vim-enhanced

#设置时钟同步

echo "设置时钟同步......"

echo "*/5 * * * * root /usr/sbin/ntpdate time7.aliyun.com &>/dev/null" >> /etc/crontab

#修改Bash提示符字符串

echo "改Bash提示符字符串......"

echo 'PS1="\[\e[37;40m\][\[\e[32;40m\]\u\[\e[37;40m\]@\h \[\e[36;40m\]\w\[\e[0m\]]\\$ "' >> ~/.bashrc

source .bashrc

#修改文件打开数

echo "修改文件打开数......"

cat >> /etc/security/limits.conf <<EOF

* soft nproc

* hard nproc

* soft nofile

* hard nofile

EOF

echo "ulimit -SH 65535" >> /etc/rc.local

#优化内核参数

echo "优化内核参数....."

sed -i 's/net.ipv4.tcp_syncookies.*$/net.ipv4.tcp_syncookies = 1/g' /etc/sysctl.conf

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

net.ipv4.tcp_max_syn_backlog =

net.core.netdev_max_backlog =

net.core.somaxconn =

net.core.wmem_default =

net.core.rmem_default =

net.core.rmem_max =

net.core.wmem_max =

net.ipv4.tcp_timestamps =

net.ipv4.tcp_synack_retries =

net.ipv4.tcp_syn_retries =

net.ipv4.tcp_tw_recycle =

#net.ipv4.tcp_tw_len =

net.ipv4.tcp_tw_reuse =

net.ipv4.tcp_mem =

net.ipv4.tcp_max_orphans =

net.ipv4.ip_local_port_range =

ENDF

sysctl -p

#优化ssh参数

echo "优化ssh....."

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

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

/etc/init.d/sshd restart

如果复制过去后出现格式错误等，可以使用vim编辑，输入  :set fileformat=unix

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