1、开放端口
firewall-cmd –zone=public –add-port=12345/tcp –permanent # 开放12345端口
firewall-cmd –zone=public –remove-port=12345/tcp –permanent #关闭12345端口
firewall-cmd –reload # 配置立即生效

2、查看防火墙所有开放的端口
firewall-cmd –zone=public –list-ports

3、关闭防火墙
systemctl stop firewalld.service

4、查看防火墙状态
firewall-cmd –state

5、查看监听的端口
yum install -y net-tools
netstat -lnpt

6、检查端口被哪个进程占用
netstat -lnpt |grep 12345

function rateConfig()
{
return [
1 => 0.397,
2 => 0.400,
3 => 0.203,
];
}

function randRate()
{
$rateConfig = rateConfig();
foreach ($rateConfig as $k => $v) {
$rateConfig[$k] = $v * 10000;
}

//概率数组的总概率精度
$proSum = array_sum($rateConfig);

//概率数组循环
foreach ($rateConfig as $key => $proCur) {
$randNum = mt_rand(1, $proSum);
if ($randNum <= $proCur) {
$result = $key;
break;
} else {
$proSum -= $proCur;
}
}
unset ($proArr);
return $result;
}