Docker network nat download#
Docker network nat mac#

At the bottom of the configuration are the ports that will be exposed to the local network, note that this setting is different to the PORT environment variable which is for ports you want to expose over Nord. This VPN container requires additional capabilities (cap_add) because it needs to manipulate the network in ways containers arenвЂ™t usually allowed to (see here). All these containers work in the same way and are configured similarly and the configuration of the Nord service is shown below. At the most basic end is an OpenVPN container but if you are using Nord or PIA there are specific containers for those VPN providers (and others). There are a number of images available that will create a VPN container that you can use. This type of configuration is not well documented in Docker, the best I could find was this. A much better solution is to run a separate container that opens and maintains a VPN link and then make the other containers use the networking stack of that VPN container.

Docker network nat mac#

Using the host network is really intended for applications that must have this type of access, for example when running a DHCP server that requires access to MAC addresses. This would be a quick solution as it would require only a minimal change to the compose file but itвЂ™s also not a great solution. One solution I explored was to just place all the containers on the host network and continue using the UFW firewall I had already configured. You donвЂ™t want anyone to know you like Linux so youвЂ™ll want that to run over a VPN.

Docker network nat download#

Why is this a problem? LetвЂ™s say youвЂ™re using Deluge to download Linux ISOвЂ™s. Likewise, if that container connects to the outside world using the default bridge it wonвЂ™t got out over the VPN but it will if itвЂ™s set to use the host network. If you change the docker run command to вЂ“net=host then youвЂ™ll find the firewall works, this is because youвЂ™ve placed the container on the host network and forced it to use the rules UFW created. Docker effectively bypasses the firewall youвЂ™ve created.ДЄs an experiment, if you set up a completely closed off firewall with UFW and then start up a container with a port mapped to the host (letвЂ™s say port 80 for nginx) youвЂ™ll be able to access it from your network even though the port isnвЂ™t open on the firewall according to UFW. Docker creates itвЂ™s own chains in iptables that bypass the rules set up by UFW and worse UFW canвЂ™t even show you that has happened. If you are running a firewall similar to the one I discussed earlier you might expect that the containers started with Docker would also be forced to use that VPN but youвЂ™d be wrong. When you start a number of services with Docker Compose it will, by default, create a new bridge network for you with a name based on the name of your project. with Docker run) it goes into the default bridge network. By default when a single container is started (e.g. Docker networks are, or at least can be, complicated. The solution discussed in that post is fine if you are only dealing with regular applications but when you are dealing with containers the world is a difference place. A while back I wrote a post on routing all traffic through a VPN under Linux.