linux命令总结四(iptables/firewalld/rc.local/systemctl)

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linux找不到iptables

//关闭防火墙,安装或更新服务,打开iptables
systemctl stop firewalld
yum install iptables-services
systemctl enable iptables
systemctl start iptables

service iptables save

有时候linux版本不同，iptables不可用，只能用firewalld替代
防火墙是整个数据包进入主机前的第一道关卡。Iptables和firewalld只能开一个。 需要先屏蔽一个

//停止并屏蔽iptables：
systemctl stop iptables
systemctl mask iptables
//安装、解除屏蔽并启动firewalld
yum install firewalld
systemctl unmask firewalld
systemctl start firewalld
systemctl status firewalld
//设置开机启动
systemctl enable firewalld

设置开机启动

通过修改/etc/rc.local文件可以设置activemq开机启动

cd /usr/server/backup/activemq/bin/ && ./activemq start

如果安装在非root账户下，加上

sudo changhf -c '/usr/server/backup/activemq/bin/activemq start'

设置之前先验证下修改该文件是否生效

systemctl list-dependencies multi-user.target | grep rc-local

//执行上面命令如果没有输出结果，执行如下命令后再次测试
chmod +x /etc/rc.d/rc.local
systemctl daemon-reload

systemctl

systemctl实际上是将service 和 chkconfig两个命令组合在一起

systemctl enable firewalld.service  //设置开机启动防火墙
systemctl disable firewalld.service //设置开机不启动防火墙

//常用操作
systemctl start|stop|restart|status|enable|disable firewalld.service