Centos7 open port and query Port

Centos7 uses the firewall: & lt; 1 & gt; for example, to query whether port 9200 is opened by the following command: firewall-cmd -- query-port = 9200/tcp, return yes, indicating to open & lt; 2 & gt; run the following command to open port 9300: firewall-cmd -- add-p

Centos 7 adopts the firewall:

<1> For example, check whether Port 9200 is enabled.

Command: firewall-cmd -- query-port = 9200/tcp

Yes indicates opening

<2> open port 9300

Command: firewall-cmd -- add-port = 9300/tcp

If success is returned, the operation is successful.