#对一台新机器根据当前机器配置实现内核参数的初始化
#将脚本加入计划任务后，若机器配置出现更改可根据配置的更改修改内核参数
#!/bin/bash
Mem=$(free | grep Mem | awk ‘{print $2}‘) #获取系统当前内存大小
parameter=$(expr $Mem / 64) #计算内核参数配置
#echo $Mem $parameter
conf=(net.ipv4.tcp_tw_recycle net.ipv4.tcp_tw_reuse net.ipv4.tcp_syncookies net.ipv4.tcp_syncookies net.ipv4.tcp_synack_retries net.ipv4.tcp_syn_retries net.ipv4.tcp_fin_timeout)
for i in ${conf[@]}
do
determine=$(cat /etc/sysctl.conf | grep $i)
if [ -z "$determine" ]; then
echo "$i = 1" >> /etc/sysctl.conf
fi
done
determine=$(cat /etc/sysctl.conf | grep net.ipv4.tcp_max_tw_buckets)
if [ -z "$determine" ]; then
echo "net.ipv4.tcp_max_tw_buckets = 6000" >> /etc/sysctl.conf
fi
determine=$(cat /etc/sysctl.conf | grep net.ipv4.tcp_keepalive_time)
if [ -z "$determine" ]; then
echo "net.ipv4.tcp_keepalive_time = 30" >> /etc/sysctl.conf
fi
Mem_conf=(net.ipv4.tcp_max_orphans net.ipv4.tcp_max_syn_backlog net.core.somaxconn net.core.netdev_max_backlog)
for mem_conf in ${Mem_conf[@]}
do
determine=$(cat /etc/sysctl.conf | grep $mem_conf)
if [ -z "$determine" ]; then
echo "$mem_conf = $parameter" >> /etc/sysctl.conf
else
sed -i ‘s/‘‘‘$mem_conf‘‘‘ = [0-9]*/‘‘‘$mem_conf‘‘‘ = ‘‘‘$parameter‘‘‘/‘ /etc/sysctl.conf
fi
done
sysctl -p
determine=$(cat /etc/security/limits.d/90-nproc.conf | grep "65535")
if [ -z "$determine" ]; then
echo "* hard nproc 65535" >> /etc/security/limits.d/90-nproc.conf
fi
determine=$(cat /etc/security/limits.conf | grep "* hard nofile 65535")
if [ -z "$determine" ]; then
sed -i ‘/End of file/i\* hard nofile 65535‘ /etc/security/limits.conf
fi
determine=$(cat /etc/security/limits.conf | grep "* soft nofile 65535")
if [ -z "$determine" ]; then
sed -i ‘/End of file/i\* soft nofile 65535‘ /etc/security/limits.conf
fi
determine=$(cat /etc/security/limits.conf | grep "* hard nproc 65535")
if [ -z "$determine" ]; then
sed -i ‘/End of file/i\* hard nproc 65535‘ /etc/security/limits.conf
fi
determine=$(cat /etc/security/limits.conf | grep "* soft nproc 65535")
if [ -z "$determine" ]; then
sed -i ‘/End of file/i\* soft nproc 65535‘ /etc/security/limits.conf
fi
determine=$(cat /etc/profile | grep "export HISTFILESIZE=100000")
if [ -z "$determine" ]; then
echo "export HISTFILESIZE=100000" >> /etc/profile
fi
determine=$(cat /etc/profile | grep "export HISTTIMEFORMAT=\"%Y-%m-%d %H:%M:%S \"")
if [ -z "$determine" ]; then
echo "export HISTTIMEFORMAT=\"%Y-%m-%d %H:%M:%S \"" >> /etc/profile
fi
source /etc/profile本文出自 “10946218” 博客，谢绝转载！
原文地址：http://10956218.blog.51cto.com/10946218/1928527
