#!/bin/bash
##############################################################
# File Name: optimization.sh
# Version: V1.0
# Author: jiege
# Organization: http://jiege3324.blog.51cto.com/
# Created Time : 2017-04-14 14:26:08
# Description: Linux system initialization
# E.g: /bin/sh optimization.sh 192.168.169.11
##############################################################
. /etc/init.d/functions
if [ $# -ne 1 ];then
Msg "Please enter the ip address passed to the script!"
exit 1
fi
ipaddr=$1
# Defined result function
function Msg(){
if [ $? -eq 0 ];then
action "$1" /bin/true
else
action "$1" /bin/false
fi
}
# Defined Time Synchronization Functions
function Time(){
echo "#time sync by jiege at $(date +%F)" >>/var/spool/cron/root
echo '*/5 * * * * /usr/sbin/ntpdate time.nist.gov &>/dev/null' >>/var/spool/cron/root
Msg "Time Synchronization"
}
# Defined IP function
function ConfigIP(){
#Suffix=`ifconfig eth1|awk -F "[ .]+" 'NR==2 {print $6}'`
Suffix=`echo $ipaddr |awk -F "." '{print $4}'`
cat >/etc/sysconfig/network-scripts/ifcfg-eth0 <<EOF
DEVICE=eth0
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
USERCTL=no
IPV6INIT=no
IPADDR=192.168.169.$Suffix
NETMASK=255.255.255.0
GATEWAY=192.168.169.2
DNS1=192.168.169.2
NAME="System eth0"
EOF
Msg "config eth0"
cat >/etc/sysconfig/network-scripts/ifcfg-eth1 <<EOF
DEVICE=eth1
TYPE=Ethernet
ONBOOT=yes
NM_CONTROLLED=yes
BOOTPROTO=none
USERCTL=no
IPV6INIT=no
IPADDR=192.168.10.$Suffix
NETMASK=255.255.255.0
NAME="System eth1"
EOF
Msg "config eth1"
}
# Defined Yum source Functions
function UpdateYumSource(){
YumDir=/etc/yum.repos.d
repoDir=http://mirrors.aliyun.com/repo/Centos-6.repo
epelDir=http://mirrors.aliyun.com/repo/epel-6.repo
[ -f "$YumDir/CentOS-Base.repo" ] && cp $YumDir/CentOS-Base.repo{,.ori}
#wget -O $YumDir/CentOS-Base.repo http://$Ip:$Port/$ConfigDir/CentOS-Base.repo &>/dev/null &&\
#wget -O $YumDir/epel.repo http://$Ip:$Port/$ConfigDir/epel.repo &>/dev/null &&\
wget -O $YumDir/CentOS-Base.repo $repoDir &>/dev/null &&\
wget -O $YumDir/epel.repo $epelDir &>/dev/null &&\
#清空yum缓存,建立yum缓存
yum clean all && yum makecache &&\
#然后使用如下命令将系统更新到最新
# rpm --import /etc/pki/rpm-gpg/RPM-GPG-KEY* #导入签名KEY到RPM
# yum upgrade -y #更新系统内核到最新
Msg "YUM source"
}
#Install the base package (tree nmap sysstat lrzsz telnet dos2unix)
function InstallBasePackage() {
yum install -y tree nmap sysstat lrzsz dos2unix telnet &>/dev/null &&\
Msg "Base packages"
}
#Lock critical file systems()
function LockCriticalFile() {
chattr +i /etc/passwd &&\
chattr +i /etc/inittab &&\
chattr +i /etc/group &&\
chattr +i /etc/shadow &&\
chattr +i /etc/gshadow &&\
Msg "Lock files"
}
# Defined Hide the system version number Functions
function HideVersion(){
[ -f "/etc/issue" ] && >/etc/issue
Msg "Hide issue"
[ -f "/etc/issue.net" ] && > /etc/issue.net
Msg "Hide issue.net"
}
# Defined OPEN FILES Functions
function openfiles(){
[ -f "/etc/security/limits.conf" ] && {
echo '* - nofile 65535' >> /etc/security/limits.conf
Msg "open files"
}
}
#Defined Stop iptables Functions
function StopIptables() {
[ -f "/etc/init.d/iptables" ] && {
/etc/init.d/iptables stop
chkconfig iptables off
Msg "stop iptables"
}
}
#Defined Close SELinux Functions
function CloseSELinux(){
[ -f "/etc/selinux/config" ] && {
sed -i "s#SELINUX=enforcing#SELINUX=disabled#g" /etc/selinux/config
setenforce 0
Msg "Close SELinux"
}
}
#Defined Modify the remote login configuration on the SSH server
function ModifySSHConfig(){
[ -f "/etc/ssh/sshd_config" ] && {
cp /etc/ssh/sshd_config /etc/ssh/sshd_config.ori
sed '13i Port 6666\nPermitRootLogin no\nPermitEmptyPasswords no\nUseDNS no\nGSSAPIAuthentication no' /etc/ssh/sshd_config
/etc/init.d/sshd reload
Msg "Modify ssh config"
}
}
#Kernel parameter optimization
function KernelParameterOpti() {
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，防火墙不开会有提示，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
EOF
#使配置文件生效
sysctl �Cp &>/dev/null &&\
Msg "Kernel parameter optimization"
}
# Defined System Startup Services Functions
function boot(){
for n in `chkconfig --list|grep "3:on"|awk '{print $1}'|grep -vE "crond|network|rsyslog|sshd|sysstat"`
do
chkconfig $n off
done
Msg "BOOT config"
}
# Defined main Functions
function main(){
ConfigIP
ClonedNetworkOpti
Time
UpdateYumSource
InstallBasePackage
CloseSELinux
StopIptables
openfiles
boot
KernelParameterOpti
HideVersion
LockCriticalFile
}
原文链接：https://www.f2er.com/centos/377029.html