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Cake day: August 19th, 2023

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  • qx128@lemmy.worldtoSelfhosted@lemmy.worldDocker network internet access
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    4 months ago

    It sounds like your issue might be related to how your Docker networks are configured for DNS and internet access. Try these:

    1. Check Network Configuration: Ensure your new networks are correctly configured to allow internet access. Docker networks should be able to route traffic to the internet by default unless specified otherwise.

    2. DNS Configuration: Since you’re using Pi-hole for DNS, make sure the new networks are properly configured to use Pi-hole as their DNS server.

    3. Inspect Network Settings: Compare the settings of old_main with the new networks. Use the following command to inspect the network configuration:

      docker network inspect old_main
      docker network inspect cloudflared
      

      Pay attention to the gateway, subnet, and any custom DNS settings.

    4. Check Docker Daemon Configuration: Verify that your daemon.json file is correctly set up to use Pi-hole for DNS. It should look something like this:

      {
        "dns": ["<Pi-hole IP>"]
      }
      
    5. Verify Container Configuration: Ensure that your containers are correctly configured to use the new network. This can be specified in your docker-compose files like this:

      version: '3.7'
      services:
        cloudflared:
          image: cloudflare/cloudflared
          networks:
            - cloudflared
      
      networks:
        cloudflared:
          external: true
      
    6. Check Firewall Rules: Ensure there are no firewall rules on your host or network equipment that might be blocking traffic from the new networks.

    7. Test Connectivity: Run a simple connectivity test from within a container on the new network to check internet access:

      docker run --rm -it --network cloudflared alpine ping -c 4 google.com
      

      If this fails, the issue is likely with network configuration rather than the containers themselves.

    8. Docker Network Restart: Sometimes, Docker networks need to be restarted to apply changes correctly. Try removing and recreating the problematic networks:

      docker network rm cloudflared
      docker network create cloudflared
      

    If none of the above steps resolve the issue, there might be a deeper configuration problem. At this point, it might be helpful to see the exact configuration of your docker-compose files and the output of the network inspection commands.




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