systemctl status firewalld        看到active(running)就意味着防火墙打开了

systemctl stop firewalld          看到inactive(dead)就意味着防火墙封锁了

systemctl start firewalld          打开防火墙

systemctl disable firewalld        重启后防火墙还是处于封锁的状态

systemctl enable firewalld        重启不会恢复到本来的状态

systemctl restart firewalld.service  重启防火墙

防火墙端口开放与封锁

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            //检察当前所有tcp端口·

netstat -ntulp |grep 80   //检察所有80端口使用情况·

netstat -an | grep 3306   //检察所有3306端口使用情况·

检察一台处事器上面哪些处事及端口

netstat  -lanp

检察一个处事有几个端口。好比要检察mysqld

ps -ef |grep mysqld

检察某一端口的连接数量,好比3306端口

netstat -pnt |grep :3306 |wc

检察某一端口的连接客户端IP 好比3306端口

netstat -anp |grep 3306

netstat -an 检察网络端口

更新yum源 常用安置依赖

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

centos7 php开发环境安置（一）