[CentOS 8 Stream] 방화벽, firewalld, firewall-cmd

firewalld 설치

## firewalld 설치
sudo dnf install firewalld 

## firewalld 서비스 시작, 활성화
sudo systemctl start firewalld 
sudo systemctl enable firewalld 

## firewalld 서비스 종료, 비활성화
sudo systemctl stop firewalld 
sudo systemctl disable firewalld

 

방화벽 상태 확인

## sudo systemctl status firewalld
$ sudo systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: active (running) since Thu 2023-10-05 21:33:02 UTC; 2 days ago
     Docs: man:firewalld(1)
 Main PID: 568 (firewalld)
   CGroup: /system.slice/firewalld.service
           └─568 /usr/bin/python2 -Es /usr/sbin/firewalld --nofork --nopid

Oct 08 07:53:18 dev01 firewalld[568]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configuration option. It will be removed in a future...ing it now.
Oct 08 07:54:14 dev01 firewalld[568]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configuration option. It will be removed in a future...ing it now.
Oct 08 07:55:08 dev01 firewalld[568]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configuration option. It will be removed in a future...ing it now.
Oct 08 07:55:50 dev01 firewalld[568]: WARNING: NOT_ENABLED: http,https
Oct 08 07:56:14 dev01 firewalld[568]: WARNING: AllowZoneDrifting is enabled. This is considered an insecure configuration option. It will be removed in a future...ing it now.
Hint: Some lines were ellipsized, use -l to show in full.

## sudo firewall-cmd --state
$ sudo firewall-cmd --state
running

 

서비스 추가/삭제 하기

# 서비스 추가
firewall-cmd가--add-service=http --permanent
firewall-cmd --add-service=https --permanent
firewall-cmd --reload
firewall-cmd --list-all

# 서비스 삭제
firewall-cmd --remove-service=http --permanent
firewall-cmd --remove-service=https --permanent
firewall-cmd --reload
firewall-cmd --list-all

 

포트 추가/삭제 하기

# 포트 추가
firewall-cmd --add-port=8080/tcp --permanent
firewall-cmd --reload
firewall-cmd --list-all

# 포트 삭제
firewall-cmd --remove-port=8080/tcp --permanent
firewall-cmd --reload
firewall-cmd --list-all

 

firewall-cmd 사용법

## 방화벽 리스트 확인
sudo firewall-cmd --list-all
sudo firewall-cmd --list-all --permanent
sudo firewall-cmd --list-all --permanent --zone=public
sudo firewall-cmd --list-services 
sudo firewall-cmd --list-ports

# zone
sudo firewall-cmd --get-zones
sudo firewall-cmd --get-default-zone
sudo firewall-cmd --get-active-zones
sudo firewall-cmd --set-default-zone=public
sudo firewall-cmd --zone=public --list-all 
sudo firewall-cmd --zone=public --change-interface=enp0s3

## etc
sudo firewall-cmd --reload