Linux server Check whether the port is enabled or occupied

Lsof -i :22 Knows which process occupies port 22

Netstat LNP | grep 7000 to check 7000 port is occupied by a which process

Open ports

Method 1 1. Enable the firewall

systemctl start firewalld
systemctl stop firewalld
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2. Open the specified port

firewall-cmd --zone=public --add-port=1935/tcp --permanent
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Description of the command: –zone # scope –add-port=1935/ TCP # Add port. The format is: port/communication protocol –permanent # Permanent

3. Restart the firewall

firewall-cmd --reload
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4. Check the port number

Netstat NTLP / / view the current all TCP port netstat ntulp | grep / 1935 / see all 1935 port usageCopy the code

Mode 2 # Open port :8080

/sbin/iptables -I INPUT -p tcp --dport 8080 -j ACCEPT
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Methods 3

-A INPUT -m state --state NEW -m tcp -p tcp --dport 8080 -j ACCEPT
service iptables restart

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