防火墙
1.systemctl命令用法
对比表,以 httpd(apache) 为例
| 任务 | 旧指令 | 新指令 |
| 使某服务自动启动 |
chkconfig --level 3 httpd on |
systemctl enable httpd.service |
| 使某服务不自动启动 |
chkconfig --level 3 httpd off |
systemctl disable httpd.service |
| 检查服务状态 | service httpd status | systemctl status httpd.service (服务详细信息) systemctl is-active httpd.service (仅显示是否 Active) |
| 显示所有已启动的服务 |
chkconfig --list |
systemctl list-units --type=service |
| 启动某服务 | service httpd start | systemctl start httpd.service |
| 停止某服务 | service httpd stop | systemctl stop httpd.service |
| 重启某服务 | service httpd restart | systemctl restart httpd.service |
服务
service iptables restart #重启
1.防火墙 CentOS 7.0默认使用的是firewall作为防火墙,这里改为iptables防火墙。
1、关闭firewall:
systemctl stop firewalld.service #停止firewall systemctl disable firewalld.service #禁止firewall开机启动
2、安装iptables防火墙
yum install iptables-services #安装
vi /etc/sysconfig/iptables #编辑防火墙配置文件
# Firewall configuration written by system-config-firewall # Manual customization of this file is not recommended. *filter :INPUT ACCEPT [0:0] :FORWARD ACCEPT [0:0] :OUTPUT ACCEPT [0:0] -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT -A INPUT -p icmp -j ACCEPT -A INPUT -i lo -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 22 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 80 -j ACCEPT -A INPUT -m state --state NEW -m tcp -p tcp --dport 3306 -j ACCEPT -A INPUT -j REJECT --reject-with icmp-host-prohibited -A FORWARD -j REJECT --reject-with icmp-host-prohibited COMMIT
:wq! #保存退出 systemctl restart iptables.service #最后重启防火墙使配置生效 systemctl enable iptables.service #设置防火墙开机启动
二、关闭SELINUX
vi /etc/selinux/config
#SELINUX=enforcing #注释掉 #SELINUXTYPE=targeted #注释掉 SELINUX=disabled #增加
:wq! #保存退出 setenforce 0 #使配置立即生效

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