Centos7.x系统优化脚本

1、Centos7.x系统优化脚本

vi system_optimize.sh

#!/bin/bash
#脚本功能：优化Centos7.x系统

#install software
yum install wget lrzsz net-tools git unzip tree ntp -y

#change yum repo
mv /etc/yum.repos.d/CentOS-Base.repo /etc/yum.repos.d/CentOS-Base.repo.bak
wget -O /etc/yum.repos.d/CentOS-Base.repo http://mirrors.aliyun.com/repo/Centos-7.repo
wget -O /etc/yum.repos.d/epel-7.repo http://mirrors.aliyun.com/repo/epel-7.repo
yum clean all
yum makecache

#安装开发工具和依赖包
#yum groupinstall "Compatibility libraries" "Base" "Development tools" -y

#关闭防火墙与selinux
systemctl stop firewalld.service
systemctl disable firewalld
sed -i 's/SELINUX=enforcing/SELINUX=disabled/g' /etc/sysconfig/selinux
setenforce 0

#更改主机名
systemctl set-hostname node1
hostname node1

#配置解析
#echo "59.47.71.229 node1" >>/etc/hosts  
#tail -1 /etc/hosts

#配置dns
cat >>/etc/resolv.conf <<EOF
nameserver 114.114.114.114
nameserver 100.100.2.138
EOF

#关闭 NetworkManager
systemctl stop NetworkManager
systemctl disable NetworkManager

#配置NTP时间同步
echo "*/5 * * * *  /usr/sbin/ntpdate ntp1.aliyun.com &>/dev/null" >>/usr/bin/crontab

#设置字符集
echo 'LANG="zh_CN.UTF-8"' >>/etc/locale.conf 

# 关闭邮件服务
systemctl stop postfix.service 
systemctl disable postfix.service

#文件描述符
echo "* - nofile 65535" >>/etc/security/limits.conf

#优化内核TCP参数
cat >>/etc/sysctl.conf<<EOF  
net.ipv6.conf.all.disable_ipv6 = 1
net.ipv6.conf.default.disable_ipv6 = 1
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.icmp_ignore_bogus_error_responses = 1
net.ipv4.ip_forward = 0
net.ipv4.conf.all.send_redirects = 0
net.ipv4.conf.default.send_redirects = 0
net.ipv4.conf.all.rp_filter = 1
net.ipv4.conf.default.rp_filter = 1
net.ipv4.conf.all.accept_source_route = 0
net.ipv4.conf.default.accept_source_route = 0
kernel.sysrq = 0
kernel.core_uses_pid = 1
net.ipv4.tcp_syncookies = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
net.ipv4.tcp_max_tw_buckets = 6000
net.ipv4.tcp_sack = 1
net.ipv4.tcp_window_scaling = 1
net.ipv4.tcp_rmem = 4096 87380 4194304
net.ipv4.tcp_wmem = 4096 16384 4194304
net.core.wmem_default = 8388608
net.core.rmem_default = 8388608
net.core.rmem_max = 16777216
net.core.wmem_max = 16777216
net.core.netdev_max_backlog = 262144
net.ipv4.tcp_max_orphans = 3276800
net.ipv4.tcp_max_syn_backlog = 262144
net.ipv4.tcp_timestamps = 0
net.ipv4.tcp_synack_retries = 1
net.ipv4.tcp_syn_retries = 1
net.ipv4.tcp_tw_recycle = 1
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_mem = 94500000 915000000 927000000
net.ipv4.tcp_fin_timeout = 1
net.ipv4.tcp_keepalive_time = 30
net.ipv4.ip_local_port_range = 1024 65000
fs.file-max = 265535
net.ipv4.conf.all.accept_redirects = 0
net.ipv4.conf.default.accept_redirects = 0
net.ipv4.conf.all.secure_redirects = 0
net.ipv4.conf.default.secure_redirects = 0
vm.swappiness = 10
EOF
#使其生效
/sbin/sysctl -p