Centos7.x 装机优化

Linux 服务器装机后优化参考
https://blog.csdn.net/u010133338/article/details/81055475
优化初始化脚本
vim init_optimization.sh
#!/bin/bash

#author by cc

#this script is only for CentOS 7.x

#check the OS

platform=`uname -i`

if [ $platform != "x86_64" ];then

echo "this script is only for 64bit Operating System !"

exit 1

fi

echo "the platform is ok"

cat << EOF

 your system is CentOS 7 x86_64

EOF

#添加公网DNS地址

cat >> /etc/resolv.conf << EOF

nameserver 114.114.114.114

nameserver 223.5.5.5

EOF

#Yum源更换为国内阿里源

yum install wget telnet -y

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

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

#添加阿里的epel源

#add the epel

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

# rpm -ivh http://dl.Fedoraproject.org/pub/epel/7/x86_64/e/epel-release-7-8.noarch.rpm

#yum重新建立缓存

yum clean all

yum makecache

#基础软件安装

yum -y install wget net-tools screen lsof tcpdump nc mtr openssl-devel vim bash-completion lrzsz nmap telnet tree ntpdate bash-completion chrony

#同步时间

yum -y install ntp

sed -i 's/server 0.centos.pool.ntp.org iburst/server ntp1.aliyun.com iburst/' /etc/ntp.conf

sed -i 's/server 1.centos.pool.ntp.org iburst/server ntp2.aliyun.com iburst/' /etc/ntp.conf

sed -i 's/server 2.centos.pool.ntp.org iburst/server ntp3.aliyun.com iburst/' /etc/ntp.conf

systemctl restart ntpd.service

#设置最大打开文件描述符数

echo "ulimit -SHn 102400" >> /etc/rc.local

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

*           soft   nofile       655350

*           hard   nofile       655350

EOF

#禁用selinux

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

setenforce 0

#关闭防火墙

systemctl disable firewalld.service

systemctl stop firewalld.service

#set ssh

sed -i 's/^GSSAPIAuthentication yes$/GSSAPIAuthentication no/' /etc/ssh/sshd_config

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

systemctl  restart sshd.service

#内核参数优化

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 = 655350

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

/sbin/sysctl -p

#vim定义退格键可删除最后一个字符类型

echo 'alias vi=vim' >> /etc/profile

echo 'stty erase ^H' >> /etc/profile

cat >> /root/.vimrc << EOF

set tabstop=4

set shiftwidth=4

set expandtab

syntax on

"set number

EOF

 

#
巴特西

Centos7.x 装机优化

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