Help with Firewall and Networking

nguyenb · December 23, 2022, 8:02pm

Hello,

I am trying to run a Docker container system on CentOS 9 Stream.

CTFd/CTFd/blob/master/docker-compose.yml

services:
  ctfd:
    build: .
    user: root
    restart: always
    ports:
      - "8000:8000"
    environment:
      - UPLOAD_FOLDER=/var/uploads
      - DATABASE_URL=mysql+pymysql://ctfd:ctfd@db/ctfd
      - REDIS_URL=redis://cache:6379
      - WORKERS=1
      - LOG_FOLDER=/var/log/CTFd
      - ACCESS_LOG=-
      - ERROR_LOG=-
      - REVERSE_PROXY=true
    volumes:
      - .data/CTFd/logs:/var/log/CTFd
      - .data/CTFd/uploads:/var/uploads
      - .:/opt/CTFd:ro

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The ctfd application container is unable to connect to db with error of “No route to host”

Here is an entry from journalctl -xe

Dec 23 11:08:16 host kernel: filter_FWD_public_REJECT: IN=br-517219210dc2 OUT=br-517219210dc2 PHYSIN=vethdb4e203 PHYSOUT=vethd3e2d48 MAC=02:42:ac:16:00:04:08:00 SRC=172.22.0.4 DST=172.22.0.2 LEN=60 TOS=0x00 PREC=0x00 TTL=64 ID=16578 DF PROTO=TCP SPT=36826 DPT=3306 WINDOW=64240 RES=0x00 SYN URGP=0

Would appreciate help on where to start.

rimelek · January 3, 2023, 9:40am

I don’t have experience with Centos Stream 9, but I would search for “Centos stream firewall” on Google. Centos uses firewald for firewall. You can disable it or configure it properly. You could also search for “firewalld centos docker”. I found this

It is about Centos 7, but I guess it would be similar on Centos Stream 9.

Topic		Replies	Views
Container linking on centos 7 / boot2docker Boot2Docker	1	2515	January 20, 2015
During build getting Failed connect to 10.0.2.225:80; No route to host General	8	7743	March 25, 2016
CentOS 7 firewalld warning COMMAND_FAILED while publish port to host General docker	2	8808	November 22, 2019
Issue / lack of comprehension about docker and iptables mechanics General	0	1225	February 14, 2019
Firewall and custom bridge network General	0	1599	August 26, 2020

Help with Firewall and Networking

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