准备工作
防火墙
systemctl status firewalld 看到active(running)就意味着防火墙打开了
systemctl stop firewalld 看到inactive(dead)就意味着防火墙关闭了
systemctl start firewalld 打开防火墙
systemctl disable firewalld 重启后防火墙还是处于关闭的状态
systemctl enable firewalld 重启不会恢复到原来的状态
systemctl restart firewalld.service 重启防火墙
防火墙端口开放与关闭
firewall-cmd --zone=public --add-port=80/tcp --permanent
firewall-cmd --zone=public --add-port=443/tcp --permanent
firewall-cmd --zone=public --add-port=22/tcp --permanent
firewall-cmd --zone=public --add-port=21/tcp --permanent
firewall-cmd --zone=public --add-port=53/udp --permanent
firewall-cmd --zone=public --remove-port=80/tcp --permanent
firewall-cmd --zone=public --remove-port=443/tcp --permanent
firewall-cmd --zone=public --remove-port=22/tcp --permanent
firewall-cmd --zone=public --remove-port=21/tcp --permanent
firewall-cmd --zone=public --remove-port=53/udp --permanent
firewall-cmd --zone=public --add-port=4400-4600/udp --permanent
firewall-cmd --zone=public --add-port=4400-4600/tcp --permanent
netstat -ntlp //查看当前所有tcp端口·
netstat -ntulp |grep 80 //查看所有80端口使用情况·
netstat -an | grep 3306 //查看所有3306端口使用情况·
查看一台服务器上面哪些服务及端口
netstat -lanp
查看一个服务有几个端口。比如要查看mysqld
ps -ef |grep mysqld
查看某一端口的连接数量,比如3306端口
netstat -pnt |grep :3306 |wc
查看某一端口的连接客户端IP 比如3306端口
netstat -anp |grep 3306
netstat -an 查看网络端口
更新yum源 常用安装依赖
yum install epel-release -y
yum update
yum install -y gcc gcc-c++ pcre pcre-devel openssl openssl-devel zlib zlib-devel
yum -y install ncurses-devel
yum -y install wget vim pcre pcre-devel openssl openssl-devel libicu-devel gcc gcc-c++ autoconf libjpeg libjpeg-devel libpng libpng-devel freetype freetype-devel libxml2 libxml2-devel zlib zlib-devel glibc glibc-devel glib2 glib2-devel ncurses ncurses-devel curl curl-devel krb5-devel libidn libidn-devel openldap openldap-devel nss_ldap jemalloc-devel cmake boost-devel bison automake libevent libevent-devel gd gd-devel libtool* libmcrypt libmcrypt-devel mcrypt mhash libxslt libxslt-devel readline readline-devel gmp gmp-devel libcurl libcurl-devel openjpeg-devel
原文地址：https://www.cnblogs.com/ddf128/p/12123817.html