CentOS 7 Open Port and centos Open Port

CentOS 7 Open Port and centos Open Port

After CentOS is upgraded to 7, iptables cannot be used to control the Linuxs port, because CentOS 7 uses firewalld instead of the original iptables. The following describes how to use firewalld to open a Linux Port:

1. check whether a port is open

[Root @ localhost bin] # firewall-cmd -- query-port = 8080/tcpno

2. Enable a port permanently

Firewall-cmd -- zone = public -- add-port = 8080/tcp -- permanent

[Root @ localhost bin] # firewall-cmd -- add-port = 8080/tcp -- permanentsuccess

Or:

[Root @ localhost bin] # firewall-cmd -- zone = public -- add-port = 8080/tcp -- permanent

3. open multiple ports at the same time

[Root @ localhost taotao] # firewall-cmd -- zone = public -- add-port = 30000-30999/tcp -- permanent [root @ localhost taotao] # firewall-cmd -- reload

Command description:

-- Zone # Scope

-- Add-port = 80/tcp # add a port in the format of port/communication protocol

-- Permanent # takes effect permanently. If this parameter is not set, it becomes invalid after restart.

4. Restart the Firewall

[Root @ localhost bin] # firewall-cmd -- reloadsuccess