Centos初始化

/ 王辉

!/bin/bash

written:51clocker

date:2015-07-18

email:admin@51clocker.com

web:http://www.51clocker.com

echo -e "\033[31m 这个是系统初始化脚本，请慎重运行！ press ctrl+C to cancel \033[0m" sleep 5

yum_update(){ yum -y install wget cd /etc/yum.repos.d/ mkdir bak mv ./*.repo bak wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-6.repo wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-6.repo yum clean all && yum makecache yum -y install vim unzip openssl-client gcc gcc-c++ ntp }

/etc/hosts

[ "$(hostname -i)" != "127.0.0.1" ] && sed -i "s@^127.0.0.1(.*)@127.0.0.1 hostname \1@" /etc/hosts

关闭SEKINUX

selinux(){ sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux setenforce 0 }

修改文件打开数

/etc/security/limits.conf

limits_config(){ cat >> /etc/security/limits.conf <<EOF

  • soft nproc 65535
  • hard nproc 65535
  • soft nofile 65535
  • hard nofile 65535 EOF echo "ulimit -SH 65535" >> /etc/rc.local }

    优化内核参数

    sysctl_config(){ 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 = 65536 net.core.netdev_max_backlog = 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.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.ip_local_port_range = 1024 65535 ENDF sysctl -p }

关闭系统不用的服务

stop_server(){ for server in chkconfig --list |grep 3:on|awk '{ print $1}' do chkconfig --level 3 $server off done

for server in crond network rsyslog sshd do chkconfig --level 3 $server on done }

language..

inittab(){ if [ -z "$(cat /etc/redhat-release | grep '6.')" ];then sed -i 's/3:2345:respawn/#3:2345:respawn/g' /etc/inittab sed -i 's/4:2345:respawn/#4:2345:respawn/g' /etc/inittab sed -i 's/5:2345:respawn/#5:2345:respawn/g' /etc/inittab sed -i 's/6:2345:respawn/#6:2345:respawn/g' /etc/inittab sed -i 's/ca::ctrlaltdel/#ca::ctrlaltdel/g' /etc/inittab sed -i 's@LANG=.$@LANG="en_US.UTF-8"@g' /etc/sysconfig/i18n else sed -i 's@^ACTIVE_CONSOLES.@ACTIVE_CONSOLES=/dev/tty[1-2]@' /etc/sysconfig/init sed -i 's@^start@#start@' /etc/init/control-alt-delete.conf fi /sbin/init q }

设置时间时区同步

zone_time(){ rm -rf /etc/localtime ln -s /usr/share/zoneinfo/Asia/Shanghai /etc/localtime

# Update time
/usr/sbin/ntpdate pool.ntp.org
echo '*/5 * * * * /usr/sbin/ntpdate pool.ntp.org > /dev/null 2>&1' > /var/spool/cron/root;chmod 600 /var/spool/cron/root
/sbin/service crond restart

}

配置SSHD

sshd_config(){

sed -i '/^#Port/s/#Port 22/Port 65535/g' /etc/ssh/sshd_config

sed -i '/^#UseDNS/s/#UseDNS yes/UseDNS no/g' /etc/ssh/sshd_config
#sed -i 's/#PermitRootLogin yes/PermitRootLogin no/g' /etc/ssh/sshd_config
sed -i 's/#PermitEmptyPasswords no/PermitEmptyPasswords no/g' /etc/ssh/sshd_config
/etc/init.d/sshd restart

}

iptables

iptables(){ cat > /etc/sysconfig/iptables << EOF

Firewall configuration written by system-config-securitylevel

Manual customization of this file is not recommended.

*filter
INPUT DROP [0:0]
FORWARD ACCEPT [0:0]
OUTPUT ACCEPT [0:0]
syn-flood - [0:0] -A INPUT -i lo -j ACCEPT -A INPUT -m state --state RELATED,ESTABLISHED -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 22 -j ACCEPT -A INPUT -p tcp -m state --state NEW -m tcp --dport 80 -j ACCEPT -A INPUT -p icmp -m limit --limit 100/sec --limit-burst 100 -j ACCEPT -A INPUT -p icmp -m limit --limit 1/s --limit-burst 10 -j ACCEPT -A INPUT -p tcp -m tcp --tcp-flags FIN,SYN,RST,ACK SYN -j syn-flood -A INPUT -j REJECT --reject-with icmp-host-prohibited -A syn-flood -p tcp -m limit --limit 3/sec --limit-burst 6 -j RETURN -A syn-flood -j REJECT --reject-with icmp-port-unreachable COMMIT EOF /sbin/service iptables restart source /etc/profile } other(){ # initdefault sed -i 's/^id:.*$/id:3:initdefault:/' /etc/inittab /sbin/init q # PS1 echo 'PS1="[\e[37;40m][[\e[32;40m]\u[\e[37;40m]@\h [\e[35;40m]\W[\e[0m]]\$ [\e[33;40m]"' >> /etc/profile

Record command

sed -i 's/^HISTSIZE=.*$/HISTSIZE=100/' /etc/profile echo "export PROMPT_COMMAND='{ msg=\$(history 1 | { read x y; echo \$y; });user=\$(whoami); echo \$(date \"+%Y-%m-%d %H:%M:%S\"):\$user:`pwd`/:\$msg ---- \$(who am i); } >> /tmp/`hostname`.`whoami`.history-timestamp'" >> /root/.bash_profile

Wrong password five times locked 180s

sed -i '4a auth required pam_tally2.so deny=5 unlock_time=180' /etc/pam.d/system-auth . /etc/profile }

main(){ yum_update selinux limits_config sysctl_config stop_server inittab zone_time sshd_config

iptables

other

} main