Linux

FirewallD Configuration

firewalld is a firewall service which manages the server dynamically. Firewalld removed iptables in CentOS 7. Firewalld is installed by default on RedHat Enterprise Linux and its derivatives by default. With iptables every change in order to be taken into effect needs to flush all the old rules and create new rules.

However with firewalld, no flushing and recreating of new rules required and only changes are applied on the fly.

Check if Firewalld is running or not.

# systemctl status firewalld
OR
# firewall-cmd –state

Check Firewalld Status

Get a list of all the zones.

# firewall-cmd --get-zones

Check Firewalld Zones

To get details on a zone before switching.

# firewall-cmd --zone=work --list-all

Check Zone Details

To get default zone.

# firewall-cmd --get-default-zone

Firewalld Default Zone

To switch to a different zone say ‘work‘.

# firewall-cmd --set-default-zone=work

Swich Firewalld Zones

To list all the services in the zone.

# firewall-cmd --list-services

List Firewalld Zone Services

To add a service say http, temporarily and reload firewalld.

# firewall-cmd  --add-service=http
# firewall-cmd –reload

Add http Service Temporarily

To add a service say http, permanently and reload firewalld.

# firewall-cmd --add-service=http --permanent
# firewall-cmd --reload

Add http Service Permanent

To remove a service say http, temporarily.

# firewall-cmd  --remove-service=http
# firewall-cmd --reload

Remove Firewalld Service Temporarily

To remove a service say http, permanently.

# firewall-cmd --zone=work --remove-service=http --permanent
# firewall-cmd --reload

Remove Service Permanently

To allow a port (say 331), temporarily.

# firewall-cmd --add-port=331/tcp
# firewall-cmd --reload

Open Firewalld Port Temporarily

To allow a port (say 331), permanently.

# firewall-cmd --add-port=331/tcp --permanent
# firewall-cmd --reload

Open Port in Firewalld Permanent

To block/remove a port (say 331), temporarily.

# firewall-cmd --remove-port=331/tcp
# firewall-cmd --reload

Remove Port Temporarily in Firewalld

To block/remove a port (say 331), permanently.

# firewall-cmd --remove-port=331/tcp --permanent
# firewall-cmd --reload

Remove Port Permanently in Firewalld

To disable firewalld.

# systemctl stop firewalld
# systemctl disable firewalld
# firewall-cmd --state

Disable Firewalld in CentOS 7

To enable firewalld.

# systemctl enable firewalld
# systemctl start firewalld
# firewall-cmd --state

Enable Firewalld in CentOS 7

  1. How to Configure ‘FirewallD’ in RHEL/CentOS 7
  2. Useful ‘FirewallD’ Rules to Configure and Manage Firewall

Source: http://www.tecmint.com/things-to-do-after-minimal-rhel-centos-7-installation/3/

 

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