系统初始化设置
# 设置主机名，永久修改，再次登陆生效
hostnamectl set-hostname xxxxx # 安装eprl源，常用命令
yum install -y wget && \
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo && \
yum -y install bash-completion telnet nmap tree net-tools ntpdate && \ # 查看时区，同步时间
timedatectl set-timezone Asia/Shanghai 修改时区命令
ntpdate hk.ntp.org.cn 同步时间 # 优化文件描述符
cat >>/etc/security/limits.conf<<EOF
root soft nofile
root hard nofile
* soft nofile
* hard nofile
EOF
ulimit -n # 查看 # 防火墙设置
添加允许访问的端口
firewall-cmd --zone=public --add-port=/tcp --permanent 添加允许访问的服务
firewall-cmd --permanent --add-service https 对指定IP或某个网段开放端口，允许192.168.142.166和192.168.224./24访问5432端口
firewall-cmd --permanent --add-rich-rule="rule family="ipv4" source address="192.168.142.166" port protocol="tcp" port="" accept"
firewall-cmd --permanent --add-rich-rule="rule family="ipv4" source address="192.168.224.0/" port protocol="tcp" port="" accept" 重新加载防火墙，防火墙规则生效
firewall-cmd --reload # 关闭防火墙，如果需要
systemctl stop firewalld.service && systemctl disable firewalld.service # 关闭selinux
setenforce && sed '7s#enforcing#disabled#g' /etc/selinux/config -i # 关闭ssh解析
sed -i.bak 's@#UseDNS yes@UseDNS no@g;s@^GSSAPIAuthentication yes@GSSAPIAuthentication no@g' /etc/ssh/sshd_config
systemctl restart sshd # 目录规划
/server/scripts/ 脚本存放目录
/server/tools/ 安装包存放目录
/usr/local/ 服务安装目录
/backup/ 备份目录 # ssh 白名单规则
在 /etc/hosts.allow 设置,允许连接的IP
sshd:167.179.49.12
sshd:192.168.224.0/ 在/etc/hosts.deny 设置,拒绝所有的连接
echo "sshd:all" >> /etc/hosts.deny
Centos7 系统初试化脚本
#!/bin/bash
yum install -y wget && \
wget -O /etc/yum.repos.d/epel.repo http://mirrors.aliyun.com/repo/epel-7.repo && \
yum -y install vim wget bash-completion lrzsz nmap tree nc net-tools htop iotop iftop psmisc ntpdate && \
systemctl stop firewalld.service && systemctl disable firewalld.service
#setenforce 0 && sed '7s#enforcing#disabled#g' /etc/selinux/config -i
#优化文件描述符
echo -e "* soft nofile 65535\n* hard nofile 65535" >> /etc/security/limits.conf
ulimit -n 65535
#内核优化
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
EOF
sysctl -p
sed -i.bak 's@#UseDNS yes@UseDNS no@g;s@^GSSAPIAuthentication yes@GSSAPIAuthentication no@g' /etc/ssh/sshd_config
systemctl restart sshd
echo '* * * * * root /usr/sbin/ntpdate ntp1.aliyun.com' >>/etc/crontab