• 13 Posts
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Joined 1 year ago
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Cake day: July 2nd, 2023

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    1. For all the mentioned cases, if your firewall blocks incoming packets by default, no one can access it, no matter what is the source of the port being open.

    2. You don’t configure it on the docker level, at least if you care about outside connections. If you mean from your local computer to a docker container, by default you cannot connect, unless you expose the port to the system. If you mean from other docker containers, just create your own separate network to run the container in and even docker containers cannot access the ports.

    3. I usually use netstat -tulpn, it lists all ports, not only docker, but docker is included. docker ps should also show all exposed ports and their mappings.

    In general, all docker containers run on some internal docker network. Either the default or a custom one. The network’s ports don’t interfere with your own, that’s why you can have 20 nginx servers running in a docker container on the same port. When you bind a port in docker, you basically create a bridge from the docker network to your PC’s local network. So now anything that can connect to your PC can also connect to the service. And if you allow connection to the port from outside the network, it will work as well. Note that port forwarding on your router must be set up.

    So in conclusion, to actually make a service running in docker visible to the public internet, you need to do quite a few steps!

    • bind a port to your local host
    • have your local firewall allow connection to the port
    • have your router set up to forward connections on the port to your machine

    On Linux, local firewall is usually disabled by default, but the other two steps require you to actively change the default config. And you mention that all incoming traffic is dropped using UFW, so all three parts should be covered.















  • I think I’ve explained quite well already, but again, many vendors, like Samsung, kill any background jobs before they have a chance to run. No matter what technology you use, it will get killed. The only thing that doesn’t get killed is an exact alarm that’s allowed to wake your phone from sleep. Everything else will get killed on Samsung. Including periodic alarms and including work manager, periodic or not.

    I have no idea what the rest of your message is even talking about, I don’t have any WallpaperService, I don’t do any of what you mention, so I don’t quite understand why are you even talking about it.

    In conclusion, further discussion on this topic is unnecessary because you seem to be rambling on and on about stuff that’s not at all related to why the battery optimization exception is needed. It’s not because of stock Android, but because of other vendor’s flavors of Android.