包含系统内核、网络、文件系统等方面的优化措施。

#!/usr/bin/env bash
clear
echo -ne "\\033[0;33m"

echo -ne "\\033[m"
init_hostname() {
while read -p "请输入您想设定的主机名：" name
do
	if [ -z "$name" ];then
		echo -e "\033[31m 您没有输入内容，请重新输入 \033[0m"
		continue
	fi
	read -p "您确认使用该主机名吗？[y/n]: " var
	if [ $var == 'y' -o $var == 'yes' ];then
		hostnamectl set-hostname $name
		break
	fi
done
}
init_security() {
systemctl stop firewalld
systemctl disable firewalld &>/dev/null
setenforce 0
sed -i '/^SELINUX=/ s/enforcing/disabled/'  /etc/selinux/config
sed -i '/^GSSAPIAu/ s/yes/no/' /etc/ssh/sshd_config
sed -i '/^#UseDNS/ {s/^#//;s/yes/no/}' /etc/ssh/sshd_config
systemctl enable sshd crond &> /dev/null
echo -e "\033[32m [安全配置] ==> OK \033[0m"
}
init_yumsource() {
if [ ! -d /etc/yum.repos.d/backup ];then
	mkdir /etc/yum.repos.d/backup
fi
mv /etc/yum.repos.d/* /etc/yum.repos.d/backup 2>/dev/null
if ! ping -c 2 baidu.com &>/dev/null	
then
	echo "您无法上外网，不能配置 yum 源"
	exit	
fi
	curl -o /etc/yum.repos.d/163.repo http://mirrors.163.com/.help/CentOS7-Base-163.repo &>/dev/null 
	curl -o /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo &>/dev/null
timedatectl set-timezone Asia/Shanghai
echo "nameserver 114.114.114.114" > /etc/resolv.conf
echo "nameserver 8.8.8.8" >> /etc/resolv.conf
chattr +i /etc/resolv.conf
echo -e "\033[32m [YUM　Source] ==> OK \033[0m"
}
init_install_package() {
echo -e "\033[32m 安装系统需要的软件，请稍等~ ~ ~ \033[0m"
yum -y install lsof tree wget vim  bash-completion lftp bind-utils  &>/dev/null 
yum -y install atop htop nethogs net-tools libcurl-devel libxml2-devel openssl-devel unzip  psmisc ntpdate nslookup &>/dev/null 
echo -e "\033[32m [安装常用工具] ==> OK \033[0m"
}
init_kernel_parameter() {
cat > /etc/sysctl.conf <<EOF
fs.file-max = 999999
kernel.sysrq = 0
kernel.core_uses_pid = 1
kernel.msgmnb = 65536
kernel.msgmax = 65536
kernel.shmmax = 68719476736
kernel.shmall = 4294967296
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
net.ipv4.tcp_syncookies = 1
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.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
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
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
vm.swappiness = 10
EOF
sysctl -p /etc/sysctl.conf >/dev/null 2>&1
echo -e "\033[32m [内核 优化] ==> OK \033[0m"
}
# **************************************************
init_system_limit() {
cat >> /etc/security/limits.conf <<EOF
* soft nproc 65530
* hard nproc 65530
* soft nofile 65530
* hard nofile 65530
EOF
ulimit -n 65535
ulimit -u 20480
echo -e "\033[32m [ulimits 配置] ==> OK \033[0m"
cat >> /etc/profile <<EOF
export HISTTIMEFORMAT="%Y-%m-%d %H:%M:%S "
EOF
source /etc/profile
}
main() {
init_hostname
init_security
init_yumsource
init_install_package
init_kernel_parameter
init_system_limit
}
main

执行脚本

将上述脚本保存为 init_system.sh。
赋予脚本执行权限：chmod +x init_system.sh。
执行脚本：./init_system.sh。

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