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centos7 open and close 80 port tutorial

1. The centos7 version strengthens the firewall, no longer uses the original iptables, and enables firewall

1. View the opened ports (no ports are opened by default)

firewall-cmd --list-ports

2. Open port 80

firewall-cmd --zone=public (scope) --add-port=80/tcp (port and access type) --permanent (permanent)

3. Restart the firewall

firewall-cmd --reload

4. Stop the firewall

systemctl stop firewalld.service

5. Prohibit firewall startup

systemctl disable firewalld.service

6. Delete

firewall-cmd --zone= public --remove-port=80/tcp --permanent

2. Versions below centos7

1. Open 80, 22, 8080 ports

/sbin/iptables -I INPUT -p tcp --dport 80 -j ACCEPT
/sbin/iptables -I INPUT -p tcp --dport 22 -j ACCEPT
/sbin/iptables -I INPUT -p tcp --dport 8080 -j ACCEPT

2. Save

/etc/rc.d/init.d/iptables save

3. View open ports

/etc/init.d/iptables status

4. Turn off the firewall

1-Permanent effect, will not be restored after restart

Enable: chkconfig iptables on
Off: chkconfig iptables off

2- Take effect immediately, restore after restart

Open: service iptables start
Close: service iptables stop

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